Patent Publication Number: US-8531286-B2

Title: System and method for monitoring security at a premises using line card with secondary communications channel

Description:
RELATED APPLICATION 
     This application is based upon prior filed provisional application Ser. No. 60/969,990 filed Sep. 5, 2007. 
    
    
     FIELD OF THE INVENTION 
     This invention relates to alarm systems, and more particularly, this invention relates to alarm systems in which alarm signals as alarm report data are forwarded from an alarm panel at a premises to a central station. 
     BACKGROUND OF THE INVENTION 
     Commonly assigned U.S. Pat. No. 7,391,315, the disclosure which is hereby incorporated by reference in its entirety, discloses a security system that uses various audio sensors as audio microphones located at one or more premises. In one non-limiting embodiment set forth in the &#39;315 patent, the audio sensors receive audio signals and convert the audio signals to digitized audio signals. An audio sensor can receive audio signals and converts the audio signals to digitized audio signals, which can be processed at a central processor. In some aspects, the remote security or fire alarm systems can generate “reports” and transmit the reports to a central station alarm receiver. 
     The central station alarm receiver (hereinafter identified as an “alarm receiver”), accepts incoming calls or connections with “reports” from remote security or fire-alarm systems, through a variety of communication paths. The most common communications paths are PSTN dial-up circuits, point-to-point radio circuits and/or the internet. The “reports” generated by conventional security or fire alarm systems include alarm messages, equipment status messages, and periodic communications-check messages. 
     For connections over PSTN dial-up and point-to-point radio circuits, some models of alarm receivers use plug-in circuit boards called “line cards”, or “channel-cards”, to allow flexibility in the number and/or type of communication circuits supported by the alarm receiver. In general, line cards have an interface to the alarm receiver main processor system, and implement one or more modem circuits than can communicate with the remote security or fire-alarm systems. For each modem, the line card typically also has a physical interface connector for the corresponding communications circuit. 
     In the United States, central station facilities generally only use alarm receiver systems that are listed under UL (Underwriters Laboratories) standard 1610: “Central Station Burglar-Alarm Units,” the disclosure which is hereby incorporated by reference in its entirety. If the central station operates as a UL-listed facility, it is mandatory to use alarm receivers listed under this UL standard. 
     The UL-1610 standard requires that an alarm receiver be able to operate independently of any central station “automation software.” The most practical way to meet this requirement is for the alarm receiver to process internally any and all reports it receives from remote security or fire alarm systems, regardless of the communications path (PSTN dial-up, point-to-point radio, internet) through which the report was received. 
     In addition to validating the received report, and generating any automatic message-receipt acknowledgement required by the remote system, the alarm receiver must be capable of independently performing these actions: 
     a) presenting the report information (including the unique account-number information identifying the reporting system) on a display device built into the alarm receiver; 
     b) generating an audible and/or visible annunciation of new reports; 
     c) logging the report information in a non-volatile memory system, for later review or further processing; 
     d) providing some mechanism for a human operator to acknowledge physically receipt of the report; and 
     e) directing a copy of each report to a printing device, which may be a part of the alarm receiver or electronically connected to the alarm receiver. 
     It should be understood that the UL standard allows operator-managed acknowledgement to be performed at an operator console that is part of the central station automation system, which is a software-based system. However, the alarm receiver must be capable of reverting to local (front-panel) operator-managed acknowledgement if the automation system becomes unavailable. 
     After the alarm receiver has accomplished these processing functions, it can optionally forward the alarm report data to any “automation software” that is in use at the central station. 
     In practice (particularly where several alarm receivers are installed in a central station facility), operators don&#39;t normally interface directly with alarm receivers. Instead, they handle received alarm reports on computer workstations that are part of the automation system. However, alarm receiver conformance to the UL 1610 standard ensures that the central station can respond to alarms if the automation system becomes unavailable. 
     In this UL-specified framework for communications between alarm receivers and conventional remote security or fire alarm systems, there are some important common characteristics of PSTN dial-up and/or point-to-point radio connections between the remote system and the central station: 
     a) except for a few special cases, the data-flow is unidirectional . . . from the remote system at the premises to the alarm receiver in the central station; 
     b) each connection is maintained only long enough for the remote system to transmit the report and receive any automatic message-acknowledgement from the alarm receiver; and 
     c) report data (alarm messages, remote system status messages, periodic communication-check messages) are always processed internally by the alarm receiver, before the report information is forwarded to any central station “automation software.” 
     These special cases are unique features in the remote system that can be controlled from the central station. To allow the bi-directional communications necessary for these remote system features, matching non-standard communications protocols and processes should be implemented on both the remote (premises) system and the alarm receiver. For the alarm receiver to retain its necessary UL listing, these non-standard protocols and processes must be compliant with the UL 1610 standard. 
     SUMMARY OF THE INVENTION 
     A security system includes at least one audio sensor and an alarm panel that transmits alarm report data through a communications network to at least one alarm receiver located at a central station remote from the premises that receives the alarm report data transmitted from the alarm panel through the communications network. A line card receives the alarm report data. An alarm receiver processor receives and processes regulated alarm report data in accordance with Underwriter Laboratories 1610 requirements. The line card is operable for receiving non-regulated alarm report data that is not regulated in accordance with Underwriter Laboratories 1610 requirements. The line card includes a secondary communications channel interfaced to a central station automation system and routes the regulated alarm report data to the central station automation system over the secondary communications channel and bypasses the alarm receiver processor. 
     The secondary communications channel is formed as a single Ethernet connection with the central station automation system in one non-limiting aspect. In another aspect, a non-regulated alarm report data comprises at least one of digitized audio and control messages. The regulated alarm report data is formed of at least one of account data from the premises, audible or visible enunciation of an alarm report and acknowledgements. 
     In yet another aspect, the alarm report data is formed as audio data collected at the at least one audio sensor and transmitted from the alarm panel. The alarm panel is operative for digitally encoding alarm report data and transmitting the digitally encoded alarm report data across the communications network. A modem processor can forward the digitally encoded alarm report data to the central station automation system. 
     In yet another aspect, the line card includes a modem processor for receiving alarm report data from legacy alarm panels at analog communication signals using Frequency Shift Keying (FSK) signaling. The analog communication signals are digitized as digitally encoded data and forwarded to the central station automation system. A terminator circuit has a plurality of analog front end devices and communications interface devices for interfacing with the communications network comprising a Public Switch Telephone Network (PSTN). 
     In yet another aspect, the line card establishes a bi-directional link for the non-regulated alarm report data between the central station automation system and the alarm panel without using the alarm receiver processor until the bi-directional link is no longer required. This link can be formed as audio data transmitted back and forth between the central station and the premises. The bi-directional link can be terminated when a central station operator determines that the bi-directional link is no longer required. 
     In yet another aspect, a central station alarm receiver that includes a receiver back plane that receives the line card and method aspect is also set forth. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Other objects, features and advantages of the present invention will become apparent from the detailed description of the invention which follows, when considered in light of the accompanying drawings in which: 
         FIG. 1  is block diagram showing a security system with basic components that can incorporate the line card in accordance with non-limiting examples. 
         FIGS. 2A and 2B  are block diagrams showing basic components of the security system that can be located at a premises in accordance with a non-limiting example. 
         FIGS. 3A and 3B  show basic components of a line card for the security system in accordance with a non-limiting example. 
         FIG. 4  shows basic components of a terminator circuit for the security system that can be used with the line card of  FIGS. 3A and 3B  in accordance with a non-limiting example. 
         FIGS. 5-17  are block diagrams and a logic diagram ( FIG. 15 ) showing non-limiting examples of the security system such as set forth in the incorporated by reference and commonly assigned U.S. Pat. No. 7,391,315, which can be modified for use in accordance with a non-limiting example. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout. 
     Central station alarm receivers can now include a line card that solves the technical problems described above. In accordance with a non-limiting example, a computational subsystem is implemented on the line card to analyze communications from the remote calling system. This subsystem detects any report information that is “regulated,” and directs the corresponding report data to the alarm receiver for processing. In one aspect, the report data within the “regulated” communications is directed to a backplane connector on the line card, where it is available to the main-processor of an alarm receiver. In this case, the alarm receiver processes the report information in the same manner as it would for any conventional remote security or fire-alarm system. 
     When the computational subsystem detects report information from the remote system that is “non-regulated”, the resulting information is directed through an alternate path to central station automation software. The alternate path bypasses the alarm receiver main processor. 
     Upon receiving the “non-regulated” information, the central station automation software can establish a bi-directional link to the remote system through the line card modem system and communications-circuit interface. The central station automation software system can maintain this bi-directional link until an operator or some automatic process determines it no longer needs to be maintained. 
     The computational subsystem can be implemented on a separate processor device on the line card, or can be implemented in software on a processor that performs any or all of the other line card tasks. 
     In yet another aspect, a secondary communications channel is physically implemented on the line card to provide a path for “non-regulated” communications to be routed exclusively to the central station automation software system, and not to the main processor of the alarm receiver. 
     In one aspect, the line card includes a secondary communications channel that is implemented as a single Ethernet connection on the back panel of the line card and supports “non-regulated” communications simultaneously for a plurality of PSTN dial-up connections implemented on the line card (four in a non-limiting example). 
     When the computational subsystem and secondary communications channel are applied to the line card, they can be supported with minor changes in the alarm receiver software and operation. These alarm receiver changes can be implemented in a manner that does not impair the alarm receiver&#39;s ability to meet the requirements of the UL-1610 standard. After the alarm receiver changes have been applied and the alarm receiver has been retested by UL for conformance to the UL-1610 standard, later changes to the line card design or firmware do not necessitate any further tests of the alarm receiver. 
     Thus, according to one aspect, a network interface, such as an Ethernet interface, is implemented on the line card to communicate non-alarm panel signalling such as digitized audio and control messages to the central station automation software. In yet another aspect, the line card “operating system” is implemented to control the routing of alarm-message signals to the receiver system and route non-alarm alarm-panel signalling such as the digitized audio and control messages to the central station automation-software through the line card network interface. 
       FIG. 1  shows a block diagram of an alarm system  20  that can be modified to use a line card in accordance with non-limiting examples and explained in further detail below, and showing part of the premises  21  and central station  23  that includes various servers and an alarm receiver  23  such as a Bosch/Lantronics receiver box connected with an RS-232 automation bus to a central station receiver  24  that includes several line cards such as modem line card  25 , legacy line cards  26  and other line cards  27 . These line cards could include the line card as described below with regard to  FIGS. 3A ,  3 B and  4 . The switch  30  can be a core component and connected to various servers and terminals, such as an IP automation terminal  31 , IP server  32  and IP up/down load server  33  and a speaker/display  34 . The switch  30  is also connected to the alarm receiver  23  and through the IP audio bus to the central station receiver  24  as illustrated. The switch  30  is also connected to the phone system recorder  34  that could be located at the premises or central station. The switch  30  is also connected to a firewall  35  that is connected to the communications network, which could be different types of communications network. The switch  30  can be an integral part of the receiver  23 , 24 . The network  36  is connected to the intellibase panel  37  with IP capability through the communications connections, which in this instance is an Ethernet connection  38 . The switch  30  is also connected to a neural net training machine and server  39  that works with the Internet Protocol, which in turn is connected to a 56K modem bank  40  for up/downloading. The central station receiver is connected through a telephone communications line to a public switched telephone network equipment  41 , which in turn, could be connected to different panels such as through a legacy telephone communications interface connection  42  in a 3000/4000 series panel  42  for analog audio and an intellibase panel  44  with a 56K baud socket modem  45  and digital panels  46  with a 300 baud modem  47  in one non-limiting example. 
       FIGS. 2A and 2B  show basic components of an alarm system that could be located at a premises  21 , including an intellibase control panel  48  that can connect to an IP network  49  such as the internet, a public switched telephone network (PSTN)  50  and a wireless network  51 . The intellibase control panel  48  can include various inputs and outputs and other functions as indicated and connect to various power supplies  52  and hubs  52   a , audio modules  53 , single access (door-control) modules (SAM&#39;s)  54  and readers  55  as part of a premise bus  56 . The control panel  48  also can connect through a bus to a keypad  56  and input/output expansion modules  57  and quad access (door-control) modules (QAM)  58  as indicated. As will be explained below, different features can be included on the control panel  48  and various circuit boards, including a line card. 
     The premises portion of the alarm system could include the intellibase control panel  48 , including its various inputs that are connected to different hubs and different digital audio sensors (DAS). A DSP or other processor could be located on a control panel and act as a neural network analyzer. The digital audio sensor can operate as an audio conversion system. An equivalent digital audio sensor could be used for hardware and software built into a control panel. The digital audio sensor could have four or eight or more microphones or subsystems. The system could include an acoustic (audio) recognition engine (ARE). It should be understood that different microphones can be enabled and disabled through a control mechanism in the control panel. Five-second sound clips can be sent independently to the acoustic recognition engine. The signals from microphones are candidates for recognition by the acoustic recognition engine. For each microphone, a set of coefficients can be determined, corresponding to the rate-of-rise or average amplitude coefficients. Each digital audio sensor could send captured sound clips as packets over the Ethernet. These messages could arrive at the acoustic recognition engine. A digital signal processor at each digital audio sensor could determine if the sound clips should be analyzed. This could be similar to an event trigger. The content can be analyzed to determine if further analysis is required. There is some correlation of parameters, for example, determining the difference between a gunshot and thunder. 
     The five-second sound clips are evaluated by a digital signal processor or other processor on each digital audio sensor to determine if they are eligible for further analysis. The microphones can be identified by the input that they are connected to at each digital audio sensor module and have a unique address in the system to be enabled and disabled. Once the system determines that the event qualifies as an alarm, the five-second clip can be forwarded to the central station either through an IP connection or through a modem connection. High quality MPEG4 compression can be used. 
     The acoustic recognition engine and the neural network analysis can determine if threshold conditions are met for further analysis and the information and data from microphones can be mixed digitally to provide an aggregate signal to a central station monitoring system. One stream of data can extend from an alarm panel to the central station as a digital stream and compressed. Mixed audio can be digitally mixed at each digital audio sensor. The digital streams can be digitally mixed at each stage where a digital audio sensor is located on the network. Digital streams can be combined at each stage. It is a linear system in one aspect. The data can arrive as an aggregate mix at the alarm panel at which the acoustic recognition engine circuit is located. 
     In one aspect, the line card is formed as part of a receiver line card subsystem, for example, a Bosch receiver as described above. The card can be placed into a receiver back plane. The receiver can store different alarm reports and include an IP connection and Ethernet interface. The receiver can be part of a monitoring station and include a display, printer and control panel operated by an individual. There could be a serial-to-Ethernet converter to allow the connection of the receiver to the central station. The receiver can forward the alarm message to the central station as part of an automated system. 
     The line card can process the Ethernet message. The acoustic recognition engine can be in a control panel illustrated as an intellibase control panel. Different coefficients can be used as part of an analysis system that analyzes the audio clips before compression and extract coefficients used in the processing. A coefficient development system can be implemented such that coefficients can be analyzed at different sites and nuisance sounds removed. Parameterization can be accomplished to determine if different sound parameters justify further analysis of alarms. The algorithm can look at the characteristics of the sound parameters. Sounds can be run through a training system to create a training set. There could be artificial intelligence learning in the system used with training sets. 
       FIGS. 3A and 3B  show a line card circuit  60  in accordance with a non-limiting example that can be included on one circuit board and received within a central station alarm receiver. On  FIG. 3A , basic components are illustrated including a switching power supply  61 , the receiver host-bus or backplane connector  62 , host-bus interface circuitry  63  and line card host processor  64 . The host-bus interface circuit  63  includes a SRAM dual-port circuit (DP-RAM)  64  such as a CY7C135-55 circuit that is operative with an L-buffer/address sequencer  65  and R-buffer/level shift  66  as part of left and right ports. The L-buffer/address sequencer  65  is operative with a semaphore latch  67  and level shift circuit  68 . 
     The line card host processor  64  includes a digital signal processor  69  such as an Analog Devices Blackfin BF-532 DSP that is operative with a reset supervisor circuit  70 , a 2 (two) megabyte SPI flash ROM  71  in one non-limiting example, a 128 megabyte SDRAM  72 , and crystal oscillator (25 MHz)  73 . The components are interconnected as illustrated with the various communication circuits and interrupt lines, address lines and other bus lines. 
       FIG. 3B  shows the continuation of the line card processor circuit  60  including a modem processor  74  and E-net interface circuit  75  as an Ethernet processor, a terminator card connector  76  and LED latch  77  for status LED&#39;s as illustrated. The modem processor  74  could include an Analog Device Blackfin BF-532 DSP  78  that is operable with a 128 megabyte SDRAM  79  similar to what is shown in  FIG. 3A  with the line card host processor  64  and crystal oscillator  80 . The E-net interface circuit  75  includes a WIZNET W3100A silicon E-net protocol stack  81  that is operable with an oscillator  82 , such as a 25 MHz oscillator. The LED latch  77  connects to different LED&#39;s  83 . The different bus connectors and communications interface circuits are illustrated. 
       FIG. 4  illustrates basic components that could be included on a terminator circuit board  84  that includes a line card connector  85 , power supply  86  and four analog front-end (AFE) devices  87  that are interfaced to separate RJ-11 telephone company jacks  88  through a transformer direct access arrangement (DAA) circuit  89  and line-monitoring circuits  90 . The circuit board includes an Ethernet PHY  91  device and RJ45 jack  92  with embedded magnetics, which implements a direct Ethernet communications path between each line card pair and a central station automation system such as shown in  FIG. 1 , including possibly the use of the terminals that include the IP automation terminal  31 , IP server  32 , IP up/down load server  33  and IP neural net training machine and server  39  as non-limiting examples. 
     The line card system includes line terminator circuit board  84  and line card processor circuit board  60 , together forming the line card system. These boards could be installed as an inter-connected pair in any of the line card “slots” of a central station alarm receiver such as Bosch D6600 alarm receiver as a non-limiting example. In one non-limiting example, there are eight line card slots. 
     Each line card pair  60 ,  84  (hereafter referred to simply as “line card” for purposes of description and referred generically by the description numeral  193 ) can support up to four concurrent dial-up calls from either legacy alarm panels, or new “Intellibase” alarm panels such as shown and described in  FIGS. 1 ,  2 A and  2 B. For either type of calling alarm panel, the line card  93  makes the basic alarm-report data available to the host processor  64  in the receiver through the receiver backplane. This basic alarm-report information is then processed by the receiver and forwarded to the central station automation system in the same manner as for dial-in alarm reports received from conventional alarm panels by conventional Bosch D6640 or D6641 line cards. 
     When reporting an alarm event, the alarm panels differ from “conventional” alarm panels in that they will typically also transmit audio signals from one or more microphones (the “audio sensors”) located at the protected premise. Legacy alarm panels transmit this audio to the central station as an analog signal. The Intellibase panels transmit audio to the central station as a digitally encoded signal. The line card  93  makes the audio information from either legacy or Intellibase alarm panels  37  available to the “IP” central station automation system through an Ethernet port that in one aspect is an integral part of the line card. 
     While conventional alarm panels will typically hang-up the telephone connection immediately after successfully delivering an alarm report to a central station receiver, the telephone connection with the alarm panel, in accordance with a non-limiting aspect, will normally be maintained until a central station operator determines that it is no longer necessary to continue monitoring audio from the protected premise. 
     The modem subsystem such as the included modem processor  74  in the line card  93  receives alarm calls from legacy alarm panels using Bell-103 FSK signaling as a non-limiting example. When legacy alarm panels transmit analog audio to the central station, the modem digitizes the received audio, so that it can be communicated to the IP central station automation system through a line card 10BASE-T/100BASE-TX Ethernet port. In the case of calls from Intellibase alarm panels, such as  37  in  FIG. 1 , which communicate with V.34 modem technology, the digitally-encoded audio signal from the alarm panel is forwarded through the line card Ethernet port to the automation system. 
     Two Analog Devices Inc. “Blackfin” ADSP-BF532 DSP-controller devices as processors  69 ,  78  are used on the line card such as shown in  FIGS. 3A and 3B . One of these devices functions with other components as the line card “host” processor  63   a  ( FIG. 3A ), and the other functions as the modem processor  74  ( FIG. 3B ) for different dial-up modem channels in this example, four channels. For all four lines, most modem signal and protocol functionality is implemented as DSP software. This includes V.34 negotiation (signaling-and-connection handshake) with Intellibase alarm panels, and the Bell-103 signaling, tone detection and audio digitization required for communication with legacy alarm panels. The modem system also supports advanced telephony features such as caller-ID decode, DTMF decode and encode, and cut-line detection. 
     The description proceeds relative to a Bosch alarm receiver system as described above in a non-limiting example. Eight line card slots can be included on the receiver backplane connector  62  and implemented as an electrical subset of the PC 8-bit ISA (Industry Standard Architecture) bus in a non-limiting example. 
     An example of the ISA-bus signals that can be bussed across the slot connectors are DATA 0-7, IO_ADDR 0-2, /IOR, /IOW, and RESET as non-limiting examples. A separate/SELECT signal can be provided to each line card slot connector. Each line card slot connector carries an individual interrupt-request request signal from the line card to a receiver CPU (processor). This subset of ISA signals allows the receiver CPU to communicate with the line card via ×86 byte IO instructions. 
     Other than power connections, none of the other ISA and proprietary signals that are provided on the line card slot connectors are used by the line card. Each slot connector would typically have three ground pins, and two pins for each of the +5V, +12V and −12V power-supply voltages in a non-limiting example. 
     The B_RST line card reset signal as shown in  FIG. 3A  at the connector  62  is generated by the receiver CPU, and is presented on pin  15  of every slot connector. When B_RST is asserted, it causes all of the installed line cards to be reset. On each line card, B_RST can be buffered. 
     A semaphore latch circuit  67  can be reset in the dual-port (DP) RAM  64 . An asserted LC_RESET condition as shown from the level shift  68  and reset circuit  70  in  FIG. 3A  can be generated. LC_RESET is the reset control for all of the line card processor-controlled electronics. A level shift as from the level shift circuit  68  can be provided between the 5V logic of the receiver interface and the 3.3V logic of the host-processor system. 
     Communication between the receiver CPU and the line card is transferred through the dual-port (DP) RAM  64  and associated host-bus interface  63 . The heart of this subsystem is a Cypress Semiconductor CY7C135-25 dual-port (DP) SRAM  64 . This device has a 4K×8 static Random Access Memory (SRAM) array that can be independently accessed with two separate sets of address, data and control signals. The two different sets of interfaces are typically identified as the left and right ‘ports’ and includes the address sequencer  65  and level shift  66 . This circuit does not include any arbitration circuitry and it is possible to perform simultaneously a “read” on one port while performing a “write” access to the same byte location on the other port. The results of such an operation are undefined. On the line card, arbitration for access to the dual-port memory subsystem is managed by the separate semaphore latch circuit  67 . 
     The receiver CPU (processor)  29  accesses the dual-port SRAM through address-sequencer circuits  65  connected to left port address inputs. The line card host processor  64  accesses the dual-port SRAM  64  through a right port circuit including buffer  66  in a non-limiting example. Addressing is routed through buffers. Right port data is transferred into or out of the SRAM through any buffer circuit. 
     Any of the byte locations (4096 in this example) in the DP-SRAM  64  can be addressed by either the receiver or the line card host-processor circuit  63   a . In a current receiver implementation, only the first 1024 locations of DP-SRAM are used. 
     The dual-port SRAM  64  does not include any internal arbitration logic. A “read” on one port at the same address where the other port is undergoing a “write” can result in incorrect data being read from the device. To prevent conflicts due to simultaneous DP-SRAM left and right access, semaphore latches have been implemented on the line card, a receiver-CPU DP-SRAM access latch, and a line card host-processor DP-SRAM access latch (only one is illustrated as  67 ). 
     The receiver backplane provides +5V and ±12V power-supply voltages at each slot connector. Because the interface at the slot connector operates at 5V logic levels, the Dual-Port RAM subsystem and companion semaphore-latch logic operate at 5V. All other components of the line card operate at 3.3V power-supply and logic levels. Voltage translation occurs in a buffer and transceiver devices. 
     With a 5V±10% supply voltage, the DP-SRAM circuit has the following logic-level specifications as a non-limiting example: 
     
       
         
           
               
               
               
             
               
                   
                   
               
               
                   
                 Min 
                 Max 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                   
                 V IH   
                 2.2 V 
                   
               
               
                   
                 V IL   
                   
                 0.8 V 
               
               
                   
                 V OH   
                 2.4 V 
               
               
                   
                 V OL   
                   
                 0.4 V 
               
               
                   
                   
               
            
           
         
       
     
     A data-bus transceiver can operate from a line card 3.3V supply, and offers the same V OH  and V OL  characteristics as any buffer devices. For the receive direction (when the host-processor circuit  63   a  is reading data from the DP-SRAM  64 ), the minimum V IH  is 2.0V, and the maximum V IL  is 0.8. 
     With the host-processor  63   a  asynchronous-interface timing characteristics set to allow for reasonable settling times (primarily allowing for capacitive loading), this combination of buffer and transceiver devices provides adequate margins for the interface between the line card 5V and 3.3V logic systems. 
     A National Semiconductor LM2852Y-3.3 fixed-voltage switching regulator can provide 3.3V power used on the line card in a non-limiting example. This integrated device is laser-trimmed to operate at a chosen output voltage, and requires very few external components. The inductor and capacitor values can be chosen to operate optimally at 650 mA output current, with a nominal 5V input. 
     The line card host-processor including the DSP as  69  an Analog Devices Inc. Blackfin BF-532 controller in one non-limiting example. The core section of this device can operate at up to 300 MHz. The controller (DSP)  69  in one non-limiting example has 80K bytes of internal high-speed memory that can be configured as instruction or data cache and/or SRAM. The extensive set of on-board IO hardware supports external SDRAM, asynchronous memory and IO devices, serial devices and SPI devices. Almost all of these peripherals can be supported by the DMA capabilities of the controller. Other built in peripherals include two flexible timer systems, 16 general-purpose IO pins, and two high-speed serial communication ports. 
     The reset input of the host processor  69  is managed by a Texas Instruments TPS3820-33 Power-On Reset Controller  70  in one non-limiting example. This reset controller will assert its active-low reset output during power-on while the supply voltage is less than 2.93 volts. Also, after the reset output has been negated (allowing the processor to start operation) any time the supply voltage drops below the 2.93 V threshold, the controller will re-assert the reset output. 
     The reset controller  70  (also termed reset supervisor circuit) can have a watchdog input. After the controller comes out of reset, an uninterrupted stream of pulses can be received on the watchdog input, or the controller will generate a momentary reset. A useful feature of the watchdog function is that it does not start operating until at least one pulse occurs on the watchdog input. This greatly simplifies debugging any watchdog keep-alive software. 
     The reset controller  70  also has a Master Reset input that can be used to force a reset when the supply voltage is above the 2.93V threshold and a valid watchdog keep-alive signal is present. On the line card, this active-low Master Reset input is driven by the LC_RESET signal. The LC_RESET signal is produced by a receiver backplane reset circuit and extend through the backplane connector  62 . 
     A CM309-series 25 MHz crystal  73  controls the clock frequencies of the host-processor  63   a . This crystal drives a software-configurable PLL in the processor  69 , and the core clock and system-clock for any processor peripherals are generated with software-configurable dividers running off of a phase-locked loop (PLL) in a non-limiting example (not shown). 
     A ST M25P40 4 Mbit SPI-serial Flash ROM  71  is connected to the host DSP processor  69  through a SPI bus as illustrated. This flash ROM contains firmware for both the host processor  69  and the modem processor  74  that includes the DSP processor  78 . The host DSP processor mediates the transfer of the modem processor firmware from this Flash ROM  71  to the modem processor  74 . 
     The host DSP processor  69  can have different pins, which can be used for the following functions: 
     
       
         
           
               
               
               
             
               
                   
               
             
            
               
                 PF0 
                 NC 
                 unused 
               
               
                 PF1 
                 SPI_SLFLG 
                 output - SPI interface to modem 
               
               
                   
                   
                 processor - Activity flag 
               
               
                 PF2 
                 SPI_SL_CS 
                 output - SPI Flash ROM - Chip Select, 
               
               
                   
                   
                 dedicated for Boot operation 
               
               
                 PF3 
                 BACKIRQ 
                 input - Q output of receiver-CPU DP_SRAM 
               
               
                   
                   
                 access latch 
               
               
                 PF4 
                 BACKACK 
                 output - clear receiver-CPU DP_SRAM 
               
               
                   
                   
                 access latch 
               
               
                 PF5 
                 HOSTIRQ 
                 output - set host processor DP-SRAM 
               
               
                   
                   
                 access latch 
               
               
                 PF6 
                 MDM_RESET 
                 output - reset control for modem 
               
               
                   
                   
                 processor 
               
               
                 PF7 
                 W3100_INT 
                 input - interrupt request from Wiznet 
               
               
                   
                   
                 W3100 protocol-stack processor 
               
               
                 PF8 
                 ETH_RESET 
                 output - reset control for line card 
               
               
                   
                   
                 Ethernet subsystem 
               
               
                 PF9 
                 SPI_SSEL 
                 output - SPI interface to modem 
               
               
                   
                   
                 processor select 
               
               
                 PF10 
                 SER_DBG_4 
                 undefined - handshake line 1 for serial 
               
               
                   
                   
                 debug port 
               
               
                 PF11 
                 SER_DBG_3 
                 undefined - handshake line 2 for serial 
               
               
                   
                   
                 debug port 
               
               
                 PF12 
                 MDM_INT_1 
                 input - interrupt request 1 from modem 
               
               
                   
                   
                 processor 
               
               
                 PF13 
                 MDM_INT_2 
                 input - interrupt request 2 from modem 
               
               
                   
                   
                 processor 
               
               
                 PF14 
                 ENET_MDIO 
                 IO - serial data for PHY SMI 
               
               
                   
                   
                 configuration interface 
               
               
                 PF15 
                 ENET_MDC 
                 output - clock for PHY SMI configuration 
               
               
                   
                   
                 interface 
               
               
                   
               
            
           
         
       
     
     The host DSP processor  69  communicates with the modem DSP processor  78  through the host DSP processor&#39;s SPORT0 high-speed serial communications interface as illustrated. The host DSP processor SPORT0 interface is connected to the modem DSP processor SPORT1 interface. Both the primary and secondary channels of these SPORT interfaces are interconnected. 
     The host DSP processor  69  boots from the SPI Flash ROM  71 . A boot-loader program first loads a small “exe” file that contains the program to load the remainder of the host processor firmware from the Flash ROM. The host processor  63   a  operating firmware then transfers the operating firmware for the modem processor  74  from the Flash ROM with the modem processor in the processor “boot from SPI Host” mode. The modem DSP processor  71  is also an Analog Devices Inc. BF-532 controller, identical to the line card host DSP processor  69  in this non-limiting example. The core section of the modem DSP processor  78  can be powered by a switching regulator controller built into the processor. 
     A CM309-series 24.576 MHz crystal  73  as noted before controls the clock frequencies of the host processor  63   a . This crystal drives a software-configurable PLL (not shown) in the processor, and the core clock and system-clock for the peripherals are generated with software-configurable dividers running off of a PLL. This crystal frequency has been chosen to allow operation of the modem processor  74  SPORT0 interface at the correct frequency for driving a AFE serial-bus daisy-chain. 
     Different pins (not all illustrated) on the modem processor  74  are used for the following functions in a non-limiting example: 
     
       
         
           
               
               
               
             
               
                   
               
             
            
               
                 PF0 
                 SPI_SSEL 
                 input - SPI interface to host processor - Select 
               
               
                 PF1 
                 SPI-SLFLG 
                 input - SPI interface to host processor - 
               
               
                   
                   
                 Activity flag 
               
               
                 PF2 
                 AFE-RST 
                 Output - reset control for AFE daisy-chain 
               
               
                 PF3 
                 MDM_INT_1 
                 Output - interrupt request 1 to host processor 
               
               
                 PF4 
                 MDM_INT-2 
                 Output - interrupt request 2 to host processor 
               
               
                 PF5 
                 NO_TERM 
                 input - detection of the presence of a Terminator 
               
               
                   
                   
                 card 
               
               
                 PF6 
                 NC 
                 Unused 
               
               
                 PF7 
                 NC 
                 Unused 
               
               
                 PF8 
                 NC 
                 Unused 
               
               
                 PF9 
                 NC 
                 Unused 
               
               
                 PF10 
                 SER_DBG_4 
                 undefined - handshake line 1 for serial debug 
               
               
                   
                   
                 Port 
               
               
                 PF11 
                 SER_DBG_3 
                 undefined - handshake line 2 for serial debug 
               
               
                   
                   
                 Port 
               
               
                 PF12 
                 NC 
                 unused 
               
               
                 PF13 
                 NC 
                 unused 
               
               
                 PF14 
                 NC 
                 unused 
               
               
                 PF15 
                 NC 
                 unused 
               
               
                   
               
            
           
         
       
     
     The four AFE&#39;s  87  ( FIG. 4 ) are connected to the modem processor  74  on the processor&#39;s SPORT0 high-speed serial data-bus. This data-bus is routed through the processor circuit board  60  to terminator circuit board  84  interconnect as the lien card connector  85 . The AFE&#39;s  87  are connected to the single high-speed serial-bus through a TDMA daisy-chain arrangement in one non-limiting example. All clocks for operation of the AFE&#39;s are provided through this high-speed serial bus. 
     The firmware for the modem processor  74  can be stored in the SPI Flash ROM  71  connected to the host DSP processor  69 . After the host DSP processor  69  has completed its boot process, and begins execution of the firmware, it moves an image of the modem processor firmware to the host processor SDRAM  72 . The host DSP processor  69  then releases a modem processor reset, and loads the firmware into modem DSP processor  78  memory spaces. The host DSP processor  69  acts as the SPI master for a “slave boot operation.” 
     In non-limiting examples, there are four identical telephone-line interface circuits that include the parallel AFE&#39;s  87  on the terminator circuit board  84  as shown in  FIG. 4 . These circuits connect to the central station phone system through the tip and ring terminals of the RJ-11 “telco” jacks  88 . Coupling transformers  89  are used as illustrated. 
     On the terminator circuit board  84 , each AFE  87  can be a separate Teridian 73M1903C AFE (Analog Front End) device, which performs digitization of audio signals on the secondary side of the coupling transformer as shown in  FIG. 4 . 
     The four AFE&#39;s  87  are connected to the modem processor  74  on the processor&#39;s SPORT0 high-speed serial data-bus. This data-bus is routed through the processor circuit board to a terminator circuit board interconnect  85 . The AFE&#39;s are connected to the single high-speed serial-bus through a TDMA daisy-chain arrangement. All clocks for operation of the AFE&#39;s are provided through this high-speed serial bus. 
     In addition to its signal-conversion functions, each AFE  87  has eight general-purpose IO pins (not illustrated in detail). On the line card design, four of these lines on each AFE are used for these purposes: 
     
       
         
           
               
               
               
             
               
                   
                   
               
             
            
               
                   
                 GPIO-0 
                 input - CHK_HOOK_x on-hook supervision signal 
               
               
                   
                   
                 from the CPC-5710N Phone Line Monitor IC 
               
               
                   
                 GPIO-1 
                 input - CHK_PSTN_x off-hook supervision signal 
               
               
                   
                   
                 from the CPC-5710N Phone Line Monitor IC 
               
               
                   
                 GPIO-2 
                 output - HOOK_x hook switch opto-coupler control 
               
               
                   
                 GPIO-3 
                 input - Ring_ x signal from ring-detector opto- 
               
               
                   
                   
                 coupler 
               
               
                   
                   
               
            
           
         
       
     
     AFE analog transmit and receive signals are connected to the secondary side of a coupling transformer  89  through several RC networks (not shown). The purpose of these networks is to optimize the interface between the AFE and the connected telephone “loop” over the range of expected impedance conditions and signal levels, for the chosen coupling transformer. AN analog power-supply pin of each AFE  87  is decoupled from the digital supply with a ferrite bead. 
     The various Ethernet and internet networking protocols supported by the line card are implemented with a Wiznet W3100A “Silicon Protocol Stack” circuit  81 . This device provides protocol functionality via a hardware implementation. The protocol stack circuit  81  is interfaced to the host-processor  63   a  through the processor&#39;s asynchronous memory system, using a host-processor AMSO synchronous-memory select as a non-limiting example. The clock for the protocol stack circuit is a 3.2×5 mm 25 MHz oscillator  82  in a non-limiting example. 
     The protocol stack circuit  81  communicates with an Ethernet PHY  91  on the terminator circuit board, through a standard MII interface. The MII signals are routed between the two circuit boards through a 48-pin interconnect. 
     A physical-layer 10BASE-T/100BASE-T Ethernet interface can implemented using a Teridian 78Q2123 PHY device  91  as a non-limiting example on the terminator circuit board of  FIG. 4  in a non-limiting example. The Ethernet PHY  91  is managed by the protocol stack device through a MII interface. In addition to providing the physical layer Ethernet interface, this device controls the link-status LED&#39;s in the Ethernet jack. The clock for the PHY device is controlled by a 25 MHz CM309 crystal. 
     A RJ-45 jack  92  with integrated magnetics provides the physical connection to the network. This jack includes built-in link-status LED&#39;s ( FIG. 4 ). 
     The four bi-color LED line-status indicators ( FIG. 3B ) can be controlled by outputs of a latch. The LED color can be selected by setting the polarity of the four pairs of latch outputs. Latch outputs can be set by the modem-processor writing to any address within the range controlled by the processor&#39;s AMSO asynchronous-memory select output. The clock signal for the latch is produced by the combination of a modem-processor AMSO asynchronous-memory select and a modem-processor AWE asynchronous-memory select. 
     There now follows a description of security systems such as described in the incorporated by reference and commonly assigned U.S. Pat. No. 7,391,315. Those described circuits, components and modules can be modified to use the line card  93  as described relative to  FIGS. 3A ,  3 B and  4 . 
       FIG. 5  shows a security or alarm system  120  located in a customer premises  121  in which the audio sensors  122  are formed as analog audio modules having microphones and connect into an analog control panel  124 . The audio modules  122  are operative as analog microphones and may include a small amplifier. Door contacts  126  can also be used and are wired to the control panel  124 . Other devices  127  could include an ID card reader or similar devices wired to the control panel. This section of a customer premises  121 , such as a factory, school, home or other premises, includes wiring that connects the analog audio modules  122  direct to the control panel  124  with any appropriate add-ons incorporated into the system. The phone system  128  as a Plain Ordinary Telephone System (POTS) is connected to the control panel  124 , and telephone signals are transmitted over a 300 baud industry standard telephone connection as a POTS connection to a remotely located central monitoring station  130  through a Remote Access Device (RAD)  132 . The central monitoring station typically includes a computer or other processor that requires Underwriter Laboratory (UL) approval. The different accounts that are directed to different premises or groups of alarm devices can be console specific. 
     In this type of security system  20 , typical operation can occur when a sound crosses a threshold, for example, a volume, intensity or decibel (dB) level, causing the control panel  126  to indicate that there is an intrusion. 
     A short indicator signal, which could be a digital signal, is sent to the central monitoring station  130  from the control panel  126  to indicate the intrusion. The central monitoring station  130  switches to an audio mode and begins playing the audio heard at the premises  121  through the microphone at the audio sensors or modules  122  to an operator located at the central monitoring station  130 . This operator listens for any sounds indicative of an emergency, crime, or other problem. In this system, the audio is sent at a 300 baud data rate over regular telephone lines as an analog signal. 
     In a more complex control panel  124  used in these types of systems, it is possible to add a storage device or other memory that will store about five seconds of audio around the audio event, which could be a trigger for an alarm. The control panel  124  could send a signal back to the central monitoring station  130  of about one-half second to about one second before the event and four seconds after the event. At that time, the security or alarm system  120  can begin streaming live audio from the audio sensors  122 . This can be accomplished at the control panel  124  or elsewhere. 
     This security system  120  transmits analog audio signals from the microphone in the audio sensor or module  122  to the control panel  124 . This analog audio is transmitted typically over the phone lines via a Plain Old Telephone Service (POTS) line  128  to the central monitoring station  130  having operators that monitor the audio. The central monitoring station  130  could include a number of “listening” stations as computers or other consoles located in one monitoring center. Any computers and consoles are typically Underwriter Laboratory (UL) listed, including any interface devices, for example phone interfaces. Control panels  124  and their lines are typically dedicated to specific computer consoles usually located at the central monitoring station  130 . In this security system  120 , if a particular computer console is busy, the control panel  124  typically has to wait before transmitting the audio. It is possible to include a digital recorder as a chip that is placed in the control panel  124  to record audio for database storage or other options. 
       FIG. 6  is a fragmentary block diagram of a security system  140  at a premises  142  in which a processor, e.g., a microcontroller or other microprocessor, is formed as part of each audio sensor (also referred to as audio module), forming a digital audio module, sensor or microphone  144 . 
     The audio sensor  144  is typically formed as an audio module with components contained within a module housing  144   a  that can be placed at strategic points within the premises  142 . Different components include a microphone  146  that receives sounds from the premises. An analog/digital converter  148  receives the analog sound signals and converts them into digital signals that are processed within a processor  150 , for example, a standard microcontroller such as manufactured by PIC or other microprocessor. This processing can occur at the central station in some embodiments, where the receiver such as shown in  FIGS. 1-4  could have processing capability. The processor  150  can be operative with a memory  152  that includes a database of audio signatures  152  for comparing various sounds for determining whether any digitized audio signals are indicative of an alarm condition and should be forwarded to the central monitoring station. The memory  152  can store digital signatures of different audio sounds, typically indicative of an alarm condition (or a false alarm) and the processor can be operative for comparing a digitized audio signal with digital signals stored within the memory to determine whether an alarm condition exists. The audio sensor  144  can also receive data relating to audio patterns indicative of false alarms, allowing the processor  150  to recognize audio sounds indicative of false alarms. The processor  150  could receive such data from the central monitoring station through a transceiver  154  that is typically connected to a data bus  155  that extends through the premises into a premises controller as part of a control panel or other component. 
     The transceiver  154  is also connected into a digital/analog converter  156  that is connected to a speaker  158 . It is possible for the transceiver  154  to receive voice commands or instructions from an operator located at the central monitoring station or other client location, which are converted by the processor  150  into analog voice signals. Someone at the premises could hear through the speaker  158  and reply through the microphone. It is also possible for the audio sensor  144  to be formed different such that the microphone could be separate from other internal components. 
     Although the audio sensor shown in  FIG. 7  allows two-way communication, the audio sensor does not have to include such components as shown in  FIG. 6 , and could be an embodiment for an audio sensor  144 ′ that does not include the transceiver  154 , digital/analog converter  156 , and speaker  158 . This device could be a more simple audio sensor. Also, some digital audio sensors  144  could include a jack  160  that allows other devices to connect into the data bus  155  through the audio sensors and allow other devices such as a door contact  162  to connect and allow any signals to be transmitted along the data bus. It should be understood that all processing could be accomplished at the central receiver or other location distant from the premises. 
     Door contacts  161  and other devices can be connected into an audio sensor as a module. The audio sensor  144  could include the appropriate inputs as part of a jack  160  for use with auxiliary devices along a single data bus  155 . Some audio modules  144  can include circuitry, for example, the transceiver  154  as explained above, permitting two-way communications and allowing an operator at a central monitoring station  162  or other location to communicate back to an individual located at the premises  142 , for example, for determining false alarms or receiving passwords or maintenance testing. The system typically includes an open wiring topology with digital audio and advanced noise cancellation allowing a cost reduction as compared to systems such as shown in  FIG. 5 . Instead of wiring each audio sensor as a microphone back to the control panel as in the system shown in  FIG. 5 , the audio sensors are positioned on the addressable data bus  155 , allowing each audio sensor and other device, such as door contacts, card readers or keyed entries to be addressable with a specific address. 
     It is possible to encode the audio at the digital audio sensor  144  and send the digitized audio signal to a premises controller  166  as part of a control panel in one non-limiting example, which can operate as a communications hub receiving signals from the data bus  55  rather than being operative as a wired audio control panel, such as in the system shown in  FIG. 5 . It should be understood that the premises can include an intellibase panel with IP capability as shown relative to  FIGS. 1-4  and Ethernet capability. Thus, audio can be digitized at the audio sensor  144 , substantially eliminating electrical noise that can occur from the wiring at the audio sensor to the premises controller  166 . Any noise that occurs within the phone system is also substantially eliminated from the premises controller  166  to the central monitoring station  162 . As shown in  FIG. 6 , a video camera  168 , badge or ID card reader  170  and other devices  172  as typical with a security system could be connected into the data bus  155  and located within the premises  142 . 
     Some digital phone devices multiplex numerous signals and perform other functions in transmission. As a result, a “pure” audio signal in analog prior art security systems, such as shown in  FIG. 5 , was not sent to the central monitoring station  130  along the contemporary phone network  128  when the 300 baud analog audio system was used. Some of the information was lost. In the system shown in  FIG. 6 , on the other hand, because digitization of the audio signal typically occurs at the audio sensor  144 , more exact data is forwarded to the central monitoring station  162 , and as a result, the audio heard at the central monitoring station is a better representation of the audio received at the microphone  146 . 
     As shown in  FIG. 6 , the premises controller  166  can be part of a premises central panel, and can include PCMCIA slots  174 . In another example, the premises controller  66  can be a stand-alone unit, for example, a processor, and not part of a control panel. In this non-limiting illustrated example, two PCMCIA slots  174  can be incorporated, but any number of slots and devices can be incorporated into a control panel for part of the premises controller  166 . The slots can receive contemporary PC cards, modems, or other devices. The PCMCIA devices could transmit audio data at 56K modem speed across telephone lines, at higher Ethernet speeds across a data network, at a fast broadband, or wireless, for example, cellular CDMA systems. A communications network  176  extends between the premises controller  166  and the central monitoring station  162  and could be a wired or wireless communications network or a PSTN. The PCMCIA slots  174  could receive cellular or similar wireless transmitter devices to transmit data over a wireless network to the central monitoring station  162 . As illustrated, a receiver  178  is located at the central monitoring station  162 , and in this non-limiting example, is designated a central station receiver type II in  FIG. 6  and receives the digitized audio signals. A receiver for analog audio signals from a control panel in the system  120  of  FIG. 6  could be designated a central station receiver type I, and both receivers output digitized audio signals to a local area network  182 . Other premises  184  having digital audio sensors  144  as explained above could be connected to receiver  178 , such that a plurality of premises could be connected and digital audio data from various premises  184 - 184   n  for “n” number of premises being monitored. 
     It is also possible to separate any receivers at the central monitoring station  162  away from any computer consoles used for monitoring a premises. A portion of the product required to be Underwriter Laboratory (UL) approved could possibly be the central station receiver  178 . Any computer consoles as part of the central monitoring station could be connected to the local area network (LAN)  182 . A central station server  194  could be operative through the LAN  182 , as well as any auxiliary equipment. Because the system is digital, load sharing and data redirecting could be provided to allow any monitoring console or clients  190 ,  192  to operate through the local area network  182 , while the central station server  194  allows a client/server relationship. A database at the central station server  194  can share appropriate data and other information regarding customers and premises. This server based environment can allow greater control and use of different software applications, increased database functions and enhanced application programming. A firewall  196  can be connected between the local area network  182  and an internet/worldwide web  198 , allowing others to access the system through the web  198  and LAN  182  if they pass appropriate security. 
       FIG. 8  is another view similar to  FIG. 6 , but showing a service to an installed customer base of a security system  180  with existing accounts, replacing some of the central monitoring station equipment for digital operation. The analog security system  120  is located at premises  121  and includes the typical components as shown in  FIG. 5 , which connect through the PSTN  128  to a central station receiver type I  180  for analog processing. Other devices  200  are shown with the digital security system  140  at premises  142 . For existing security systems  120  that are analog based, the central station receiver type I  180  is operative with any existing and installed equipment in which analog signals are received from the analog audio modules  122 , door contacts  126  or other devices  127 , and transmitted through the control panel  126  at 300 baud rate over the telephone line  128 . The system at premises  144 , on the other hand, digitizes the analog sound picked up by audio sensors  144  transmits the digitized data into the central monitoring station  162  and into its local area network  182  via the premises controller  174 . Data processing can occur at the premises controller  174 , which is digitized and operative with the digital audio sensors  144 . Data processing can occur at the central station. 
     At a central monitoring station  162 , an operator typically sits at an operator console. The audio is received as digitized data from the digital audio sensors  144  and received at the central station receiver type II  178 . Other analog signals from the analog audio modules  122 , control panel  126  and telephone line  128  are received in a central station receiver type I  180 . All data has been digitized when it enters the local area network (LAN)  182  and is processed at client consoles  190 ,  192 . The clients could include any number of different or selected operators. Load sharing is possible, of course, in such a system, as performed by the central station server  194 , such that a console typically used by one client could be used by another client to aid in load balancing. 
       FIG. 9  shows the type of service that can be used for remote accounts when a phone problem exist at a premises  120 , or along a telephone line in which it would be difficult to pass an analog audio signal at 300 baud rate from the control panel  126 . A digitizer  202  is illustrated as operative with the control panel  126  and provides a remedy for the analog signals emanating from the control panel over a standard telephone line to the central monitoring station  162 , when the signals cannot be received in an intelligible manner. The digitizer  202  digitizes the analog audio signal using appropriate analog-to-digital conversion circuitry and transmits it at a higher data rate, for example at a 56K baud rate to the central monitoring station  162 . In other embodiments, the digitizer could transmit over an Ethernet network connection, or over a wireless CDMA cellular phone signal to the central monitoring station  162 . The signal is received in a central station receiver type II  178 , which is operative to receive the digital signals. This improved system using the digitizer  202  in conjunction with a more conventional system could be used in the rare instance when there is poor service over existing telephone lines. The digitizer  202  could be part of the control panel  126  within the premises or located outside the premises and connected to a telephone line. 
       FIG. 10  shows different security systems  120 ,  120 ′ and  140  in which legacy accounts using the analog audio modules  122  have been provided for through either the digitizer  202  that transmits signals to the central station receiver type II  178  or the use of the central station receiver type I  180 , which receives the analog signals, such as from the security system  120 ′. Other individuals can connect to the central monitoring station  162  through the internet, i.e., worldwide web  198  as illustrated. For example, a remote client  210  could connect to the central station server  194  through the web  198 , allowing access even from a home residence in some cases. Data back-up could also be provided at a server  212  or other database that could include an application service provider (ASP) as an application host and operative as a web-based product to allow clients to obtain services and account information. Technical support  214  could be provided by another client or operator that connects through the web  198  into the system at the central monitoring station  162  to determine basic aspects and allow problem solving at different security systems. Because each audio sensor  144  is addressable on the data bus  155 , it is possible to troubleshoot individual audio sensors  144  from a remote location, such as the illustrated clients  190 ,  192 ,  210  or technical support  214 . 
     Problem accounts are also accounted for and software services provide greater client control, for example, for account information, including a client/server application at the application host  212 , which can be a web-based product. Customers can access their accounts to determine security issues through use of the worldwide web/internet  198 . Data can pass through the firewall  196  into the local area network  182  at the central monitoring station  162  and a customer or local administrator for a franchisee or other similarly situated individual can access the central station server  194  and access account information. It is also possible to have data back-up at the application host (ASP)  212  in cooperation with a client application operated by a system operator. Outside technical support  214  can access the central monitoring station  162  local area network  182  through the internet  198 , through the firewall  196 , and into the local area network  182  and access the central station server  194  or other clients  190 ,  192  on the local area network. Technical support can also access equipment for maintenance. The system as described relative to  FIG. 10  can also allow account activation through the application host  212  or other means. 
       FIG. 11  shows a system with a different business model in which the central station server  194  is remote with the database and application host (ASP)  212  and accessed through the internet/web  198 . The central station server  194  in this non-limiting example is connected to the internet  198  and different numbers of servers  194  could be connected to the internet to form a plurality of central monitoring stations, which can connect to different client monitoring consoles (with speakers for audio). Different client monitoring consoles could be owned by different customers, for example, dealers or franchisees. A corporate parent or franchiser can provide services and maintain software with updates 24/7 in an IP environment. Franchisees, customers or dealers could pay a service fee and access a corporate database. 
       FIG. 12  shows that the system has the ability to monitor at a remote location, load share, late shift or back-up. A remote operator  220  as a client, for example, can connect through the internet  198  to the local area network  182 . As illustrated, the remote client  220  is connected to the internet  198  via a firewall  222 . Both clients  210 ,  220  connect to the web  198  and to the central monitoring station  182  via the firewall  196  and LAN  182 . At the central monitoring station  162 , if an operator does not show for work, load sharing can be accomplished and some of the balance of duties assumed by the clients  210 ,  220 . Also, it is possible to monitor a client system for a fee. This could be applicable in disasters when a local monitoring station as a monitoring center goes down. Naturally, a number of local monitoring stations as monitoring centers could be owned by franchisees or run by customers/clients. 
     There may also be central monitoring stations owned or operated by a franchisee, which does not desire to monitor its site. It is possible to have monitoring stations in secure locations, or allow expansion for a smaller operator. With a web-based, broadband based station, it is possible to monitor smaller operators and/or customers, franchisees, or other clients and also locate a central monitoring station in a local region and do monitoring at other sites. It is also possible to use a virtual private network (VPN)  230 , as illustrated in  FIG. 13 . Central monitoring station receiving equipment  132  as servers or computers could be remotely located for functioning as a central monitoring station (CS), which can be placed anywhere. For example, when a local control panel (premises controller)  166  activates, the system could call an 800 number or a local number and send data to the more local monitoring location where a central monitoring station  232  exists. Thus, it is possible to place a central monitoring station in the locality or city where the account is located and use the internet move data. This allows local phone service activation and reduces telephone infrastructure costs. It should be understood that the virtual private network  230  is not a weak link in the system and is operable to move data at high speeds. Appropriate firewalls  234  could be used. 
       FIG. 14  shows that remote monitoring in the security system can be accomplished with any type of account, as shown by the premises at  240 , which includes a control panel as a premises controller  242  for monitoring a security system  243  having a design different from the design of other security systems as described above. There could be some original equipment manufacturer accounts, for example, users of equipment manufactured by Tyco Electronics, Radionics Corporation or other equipment and device providers. It is possible in the security system to monitor control equipment provided by different manufacturers. This monitoring could be transparent to the central monitoring stations through an OEM central monitoring station receiver  244 . It is possible with an appropriate use of software and an applicable receiver at the central monitoring station that any alarm system of a manufacturer could be monitored. This can be operative with the control panel as a premises controller, which can receive information from other digital security alarms. A central monitoring station receiver could be Underwriter Laboratory approved and operative as a central monitoring station receiver  244  for an original equipment manufacturer (OEM). 
       FIG. 15  is a logic diagram showing an example of software modules that could be used for the security system of the present invention. A central station receiver type I  180 , central station receiver type II  178 , and central station receiver OEM  244  are operative with respective central station receiver communications module  250  and central station digital receiver communications module  252 . Other modules include an install assistance module  254  to aid in installing any software, a net communications module  256  that is operative to allow network communications, and a logger module  258  that is operable for logging data and transactions. A schedule module  260  is operable for scheduling different system aspects, and a panel message module  262  is operative for providing panel messages. Other modules include the resolve module  264  and navigator module  266 . A database  268  is operative with a database interface  270 , and a bouncer program  272  is also operable with the client  274  that includes a user interface  276  and audio  278 . The database  268  can be accessed through the web  198  using the ASP  212  or other modules and devices as explained above. The bouncer  272  could be operative as a proxy and also act to “bounce” connections from one machine to another. 
       FIG. 16  shows different types of field equipment that can be used with a security system  140 . As illustrated, field equipment for a monitored premises  142  is illustrated as connected on one data bus  155 . The equipment includes audio sensors  144 ′, door contacts  161 , keypads  300  and card readers  302 , which can connect on one bus  155  through other sensors  144 . Some third party systems could be used, and relays  304  for zones  305  and wireless receivers  306  could be connected. 
     It should be understood that some pattern recognition can be done at the audio sensor  144  as a microphone with appropriate processing capability, but also pattern recognition could be done at the premises control panel or at the central station or a combination of these. For example, if common noises exceed a certain threshold, or if a telephone rings, in the prior art system using analog audio sensors  122  such as shown in  FIG. 5 , the noise could trip the audio. For example, a telephone could ring and the audio would trip any equipment central monitoring station, indicating an alarm. The operator would listen to the audio and conclude that a phone had rung and have to reset the system. 
     In the security system as illustrated, there is sufficient processing power at the audio sensor  144  with associated artificial intelligence (AI) to learn that the telephone is a nuisance as it recognizes when the phone rings and does not bother to transmit a signal back to the central monitoring station via the premises controller. There could be processing power at the central station for such functions if complicated audio sensors as described are not used. 
     There are a number of non-limiting examples of different approaches that could be used. For example, intrusion noise characteristics that are volume based or have certain frequency components for a certain duration and amplitude could be used. It is also possible to establish a learning algorithm such that when an operator at a central monitoring station  162  has determined if a telephone has rung, and resets a panel, an indication can be sent back to the digital audio sensor  144  that an invalid alarm has occurred. The processor  156  within the digital audio sensor  144  can process and store selected segments of that audio pattern, for example, certain frequency elements, similar to a fingerprint voice pattern. After a number of invalid alarms, which could be 5, 10 or 15 depending on selected processing and pattern determination, a built-in pattern recognition occurs at the audio sensor. A phone could ring in the future and the audio sensor  144  would not transmit an alarm. 
     Any software and artificial intelligence could be broken into different segments. For example, some of the artificial intelligence can be accomplished at the digital audio sensor  144 , which includes the internal processing capability through the processor  150  ( FIG. 6 ). Some software and artificial intelligence processing could occur at the control panel as the premises controller  166  or at the central station. For example, the digital audio sensor  144  could send a specific pattern back to the premises controller  166  or central monitoring station  162 . In one scenario, lightning occurs with thunder, and every audio sensor  144  in many different premises as monitored locations could initiate an alarm signal as the thunder cracks. In a worse case scenario, a central monitoring station  162  would have to monitor, for example, 500 alarms simultaneously. These alarms must be cleared. Any burglar who desired to burglarize a premises would find this to be an opportune time to burglarize the monitored premises because the operator at a central monitoring station  162  would be busy clearing out the security system and would not recognize that an intruder had entered the premises. 
     An algorithm operable within the processor of the premises controller  166  can determine when all audio sensors  144  went off, and based on a characteristic or common signal between most audio sensors, determine that a lightning strike and thunder has occurred. It is also possible to incorporate an AM receiver or similar reception circuitry at the premises controller  166  as part of the control panel, which receives radio waves or other signals, indicative of lightning. Based upon receipt of these signals and that different audio sensors  144  generated signals, the system can determine that the nuisance noise was created by lightning and thunder, and not transmit alarm signals to the central monitoring station  162 . This could eliminate a logjam at the central monitoring station and allow intrusion to be caught at the more local level. 
     The field equipment shown in  FIG. 16  indicates that digital audio sensors  144  digitize the audio at the audio sensor and can perform pattern recognition on-board. Audio can also be stored at the audio sensor using any memory  152  ( FIG. 6 ). Audio can also be streamed after an alarm signals. As illustrated, different devices are situated on one data bus and can interface to other devices to simplify wiring demands. These devices could be programmed and flash-updateable from the premises controller  166  or the event more remotely. There can also be different zones and relays. 
     The digital audio sensor  144  could include different types of microprocessors or other processors depending on what functions the digital audio sensor is to perform. Each audio sensor typically would be addressable on the data bus  155 . Thus, an audio sensor location can be known at all times and software can be established that associates an audio sensor location with an alarm. It is also possible to interface a video camera  168  into the alarm system. When the system determines which audio sensor has signaled an alarm and audio has begun streaming, the digital signal could indicate at the premises controller  166  if there is an associated camera and whether the camera should be activated and video begin from that camera. 
     As indicated in  FIG. 16 , door contacts  162  could be connected to the digital audio sensor  44 , enhancing overall security processing and wiring efficiency. Some rooms at a premises could have more than two audio sensors, for example, a digital audio sensor with the microprocessor, and another auxiliary sensor as a microphone  122 , which could be analog. The signal from this microphone  122  could be converted by the digital audio sensor  144 . Keypads  300  and keyless entries  302  could be connected to the digital audio sensor to allow a digital keypad input. There could also be different auxiliary inputs, including an audio sensor that receives analog information and inputs it into the digital audio sensor, which processes the audio with its analog-to-digital converter. Door contacts  162  can include auxiliary equipment and be connected into the digital audio sensor. The security system could include different relays  304  and zones  305  and auxiliary devices as illustrated. A wireless receiver  306  such as manufactured by RF Innovonics, could receive signals from the RF transmitters indicative of alarms from wireless audio digital sensors. This would allow a wireless alarm network to be established. There is also the ability to accomplish two-way communication on some of the digital audio sensors, in which the monitoring station could communicate back as explained above. It is also possible to communicate using Voice over Internet Protocol (VoIP) from the premises controller to the central monitoring station and in reverse order from the central monitoring station to a premises controller, allowing greater use of an IP network. 
     It should be understood that intrusion noises include a broad spectrum of frequencies that incorporate different frequency components, which typically cannot be carried along the phone lines as analog information. The phone lines are typically limited in transmission range to about 300 hertz to about 3,300 hertz. By digitizing the audio signals, the data can be transmitted at higher frequency digital rates using different packet formats. Thus, the range of frequencies that the system can operate under is widened, and better information and data is transmitted back to the central monitoring station, as compared to the analog security system such as shown in  FIG. 5 . 
       FIG. 17  shows the security system  140  in which customers  400  can interact with a web IEG SP1 secure site  402 , which in turn is operative with a colocation facility  404 , such as a Verio facility, including an application server  406  database server  408  and data aggregation server  410 . These servers connect to various remote central monitoring stations  412  through a web VPN network  414 . Advanced Suite software could be used. 
     Enhanced operating efficiency could include load balancing, decreased activations, decreased misses, increased accounts per monitor, and integrated digital capability for the alarm system. Disaster recovery is possible with shared monitoring, for example, on nights and weekends. This enables future internet protocol or ASP business modules. The existing wired control panel used in prior art systems is expensive to install and requires difficult programming. It has a high cost to manufacture and requires analog technology. 
     The premises controller  166  as part of a control panel is operative with digitized audio and designed for use with field equipment having addressable module protocols. The 300 baud rate equipment, such as explained with reference to  FIG. 5 , can be replaced with devices that fit into PCMCIA slots and operative at 56K or higher rates. Written noise canceling algorithms can enhance digital signal processing. This design can be accomplished with a contemporary microcontroller (or microprocessor). The system also supports multiple communications media including telephone company, DSL, cable modem and a digital cellular systems. It enables a series topology with full digital support. There is a lower cost to manufacture and about 40% reduction in the cost of a control panel in one non-limiting example. It also allows an interface for legacy control panels and digital audio detection and verification. It allows increased communication speeds. It is IP ready and reduces telephone company infrastructure costs. 
     There are many benefits, which includes the digitizing of audio at the audio sensors. Digital signal processing can occur at the audio sensor, thus eliminating background noise at the audio sensor. For example, any AC humming could be switched on/off, as well as other background noises, for example a telephone or air compressor noise. It is also possible to reduce the audio to a signature and recognize a likely alarm scenario and avoid false alarm indications for system wide noise, such as thunder. The digital audio sensors could record five seconds of audio data, as one non-limiting example, and the premises controller as a control panel can process this information. With this capability, the central monitoring station would not receive 25 different five-second audio clips to make a decision, for example, which could slow overall processing, even at the higher speeds associated with advanced equipment. Thus, a signature can be developed for the audio digital sensor, containing enough data to accomplish a comparison at the premises controller for lightning strikes and thunder. 
     Although some digital audio can be stored at the premises controller of the control panel or a central monitoring station, it is desirable to store some audio data at the digital audio sensors. The central monitoring station can also store audio data on any of its servers and databases. This storage of audio data can be used for record purposes. Each audio sensor can be a separate data field. Any algorithms that are used in the system can do more than determine amplitude and sound noise level, but can also process a selected frequency mix and duration of such mix. 
     There can also be progressive audio. For example, the audio produced by a loud thunder strike could be processed at the digital audio sensor. Processing of audio data, depending on the type of audio activation, can also occur at the premises controller at the control panel or at the central monitoring station. It is also possible to have a database server work as a high-end server for greater processing capability. It is also possible to use digital verification served-up to a client PC from a central monitoring station server. This could allow intrusion detection and verification, which could use fuzzy logic or other artificial intelligence. 
     The system could use dual technology audio sensors, including microwave and passive infrared (PIR) low energy devices. For example, there could be two sets of circuitry. A glass could break and the first circuitry in the audio sensor could be operative at microamps and low current looks for activation at sufficient amplitude. If a threshold is crossed, the first circuitry, including a processor, initiates operation of other circuitry and hardware, thus drawing more power to perform a complete analysis. It could then shut-off. Any type of audio sensors used in this system could operate in this manner. 
     The circuit could include an amplitude based microphone such that when a threshold is crossed, other equipment would be powered, and the alarm transmitted. It could also shut itself off as a two-way device. It is possible to have processing power to determine when any circuitry should arm and disarm or when it should “sleep.” 
     As noted before, there can be different levels of processing power, for example at the (1) audio sensor, (2) at the premises controller located the control panel, or (3) the central monitoring station, where a more powerful server would typically be available and in many instances preferred. The system typically eliminates nuisance noise and in front of the physical operator at a central monitoring station. Any type of sophisticated pattern recognition software can be operable. For example, different databases can be used to store pattern recognition “signatures.” Digital signal processing does not have to occur with any type of advanced processing power but can be a form of simplified A/D conversion at the microphone. It is also not necessary to use Fourier analysis algorithms at the microphone. 
     This application is related to copending patent application entitled, “SYSTEM AND METHOD FOR MONITORING SECURITY AT A PREMISES USING LINE CARD,” which is filed on the same date and by the same assignee and inventors, the disclosures which is hereby incorporated by reference. 
     Many modifications and other embodiments of the invention will come to the mind of one skilled in the art having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is understood that the invention is not to be limited to the specific embodiments disclosed, and that modifications and embodiments are intended to be included within the scope of the appended claims.