Abstract:
An audio communications control system operates between multiple voice communications systems and a single headset worn by an operator accessing the multiple communications systems via voice transmission. The single headset includes a left speaker, a right speaker, and a microphone. The audio interface provides an electrical connection and operation with each of the voice communications systems, even though each may operate with differing equipment and signal processing. The audio interface switches discrete voice communications signals and routes them to one of the left speaker, the right speaker, and conversely from the microphone of the headset to any of selected systems.

Description:
FIELD OF THE INVENTION 
   The present invention relates to communications signal control, and in particular to switching and routing of audio signals for enhancing training operations and communications between trainer and trainee. 
   BACKGROUND OF THE INVENTION 
   Distributed interactive simulation continues to grow in importance in military and civilian applications. Simulators are connected together over vast distances using a wide area network (WAN) interface. The Battle Force Tactical Trainer (BFTT) provides the U.S. Navy with onboard training for many different functions performed on a ship. While U.S. Navy ships are in port, the BFTT provides a communications connection between the ships participating in a tactical training exercise and selected scenario of interest, and connects these ships using Wide Area Network (WAN) technology. While these ships are connected together, they can participate with each other in team-training exercises. Using the BFTT, voice communications between ships within the tactical training scenario have been historically handled by a BFTT Digital Voice system (BDV) that sends and receives digital voice packets of data over the WAN. This type of communication is referred to as scenario control (SC) and is used for coordination of the training exercise by an operator. Typically, if the operator needs to communicate with someone onboard the ship that is not connected to the WAN, it is necessary to establish a separate communication link on an available and appropriate communication device. 
   The operator or operators controlling the training onboard each ship is generally referred to as a BFTT Operator Console operator, or BOPC operator. The BOPC operator has many tasks to perform when running a training exercise. By way of example, an Electronic Warfare (E/W) officer will typically be located in a room at a remote location compared to the training operator who is likely to be located in the Data Processing Control (DPC). The E/W officer or E/W staff member will typically communicate with the rest of the ship via an interphone (IP) circuit that generally includes headset and push-to-talk (PTT). The BOPC operator, typically wearing a headset that is compatible with the BOPC, removes the BOPC headset and switches to a headset and mic operated by the push-to-talk (PTT) mechanism. Further consider that the BOPC operator may need to simultaneously communicate with other members of the ship that have access to only a sound power (SP) phone circuit. To communicate with personnel positioned at these remote locations, the BOPC operator must again remove his BOPC headset, leave his position at the BOPC, and move to a location that has a sound power (SP) interface. 
   It is well known by those skilled in the art of tactical training, that time is of the essence during tactical training exercises. There is a particular need to improve the voice communication operations of the BOPC operator. There is a particular need to improve communications with those trainees that do not have access to the WAN during the training exercises. 
   SUMMARY OF THE INVENTION 
   In view of the foregoing background, it is therefore an object of the present invention to facilitate voice communications between an operator of a training console and trainees participating in a training exercise. It is further an object of the present invention to provide the BOPC operator coordinating the battle force training with improved communications with trainees positioned throughout the ship and participating in such exercises. The present invention provides a flexible and expandable architecture for enhancing voice communications, and in particular, for enhancing voice communications used onboard ships and at land sites during the BFTT exercises. The present invention is provided at a low cost when compared to typically available communications switching and routing systems. Further, the operator, an instructor in the BFTT exercises, now has effective access to a variety of communications devices using a single headset, which permits timely connection to the tactical communications systems onboard the ship. These communications systems include the interphone (IP) system used for intra-ship communications, tactical radio telephone system used for external ship communications, sound power used to access maintenance and tactical circuits onboard ship, as well as telephone interface capability for connections to commercial PBX exchanges and Wide Area Network scenario control communications. 
   These and other objects, advantages and features of the present invention are provided by an audio communications control system comprising a single headset having a left speaker, a right speaker, and a microphone for providing an operator with voice transmission. An audio interface operates between a plurality of audio communications equipment and the single headset. The audio interface provides an electrical connection to the plurality of voice communications systems for operation therewith, switching of discrete audio communications signals therefrom, and routing of the audio signals to one of the left speaker and the right speaker, and from the microphone of the headset. An operator control interface is operable with the audio interface for controlling the routing and switching of the audio signals, and includes a display for viewing by the operator and manual selection of the discrete audio communications signals to be operable with the single headset. In one preferred embodiment, the display comprises a graphical user interface display that is reconfigurable to a desired communications system display. 
   A method aspect of the present invention includes providing a single headset having a left speaker, a right speaker, and a microphone for providing an operator with voice transmission and electrically connecting an audio interface between a plurality of audio communications systems and the single headset. The audio interface switches discrete audio communications signals form the plurality of audio communications systems and routes them to one of the left speaker and the right speaker, and from the microphone of the headset in response to a command from an operator. A graphical user interface operable with the audio interface is provided for controlling the routing and switching of the audio signals by the operator. The operator activates a push button styled display for manual selection of discrete audio communications signals for operating with the headset. The method further includes the step of operating the graphical user interface for connection to a first discrete audio communications system and routing a first discrete audio signal to the left speaker and/or the right speaker of the single headset, as desired, for connection to a second discrete audio communications system, and routing a second discrete audio signal to another of the left speaker and/or the right speaker of the single headset. Also, connection is made for the microphone of the headset to a third discrete audio communications system, again as desired. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     A preferred embodiment of the invention, as well as alternate embodiments are described by way of example with reference to the accompanying drawings in which: 
       FIG. 1  is a block diagram illustrating one preferred embodiment of a voice communications control system interfacing with multiple communications systems onboard a ship; 
       FIG. 2  is a block diagram of one embodiment of the invention for interfacing with communications on a particular class of ship; 
       FIG. 3  is a diagrammatic block diagram illustrating one preferred embodiment of the system of  FIG. 1 ; 
       FIG. 4  is a partial plan view of one preferred embodiment of a hardware interface for the system of  FIG. 3 ; 
       FIG. 5  is a block diagram illustrating a functional interface of elements of the interface of  FIG. 4 ; 
       FIGS. 6 ,  7 , and  8  are plan views of various presentations of a graphical user interface of the system of  FIG. 1 . 
   

   DETAILED DESCRIPTION OF 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 numerals refer to like elements throughout. 
   As illustrated initially with reference to  FIG. 1 , one preferred embodiment of the present invention, a voice communications control system  10  includes both hardware and software for operationally connecting one or more BOPC operators  12  to tactical systems communications equipment  14  onboard a ship. Depending on the class of ship, tactical communications systems will include, by way of example, a tactical radio  16 , an interphone  18 , sound power telephone  20 , the SC as earlier described, and a surface ship telephone  22 . The surface ship telephone  22  will be used when the ship is docked and the surface ship telephone system (SSTS) is connected to typical private branch exchange (PBX) lines. By way of further example, access to the tactical radio  14  for an aircraft carrier class may be through a communications switch  24  and communications interface  26 , as illustrated with reference to  FIG. 2 . In which case, one operator  12  would have signaling access to the radiotelephone  16  and internal voice communications systems (IVCS)  28 , for the system  10  through the interface  26 . The sound power telephones (SP)  20 , and surface telephones  22  are accessed through a direct connection to these systems. 
   Further, and as illustrated with reference to  FIGS. 1 and 2 , and to  FIG. 3 , the operator  12  need wear only a single headset  30  to handle all operator communication needs, as will herein be described in further detail. The single headset  30  allows the operator to independently control the audio streams from various manually selected audio sources, to his left and right ears via left ear speaker  32  and right ear speaker  34  of the single headset  30 . The system  10  includes a hardware interface  36  including electronic card modules  38  which accommodate electronic interfacing with the different ship communication systems  14  that may be present on a particular ship class, as illustrated by way of example, with reference to  FIG. 4 . The user interface  40  remains consistent across all ship platforms, and in one preferred embodiment, includes the single headset  30 , personal computer (PC)  42  which uses a computer mouse  44  or typical alternate input devices such as a touch screen, a keyboard  46 , and a monitor  48 . The keyboard  46  will be typically be used by the operator  12  for tactical training data entry, and like the balance of the PC related hardware, is very familiar equipment for the operator. As a result, the system  10 , not only acts as a communications integrator, but also has the ability to route audio from one tactical communications systems equipment  14  to either a wide area network (WAN)  50 , or to another tactical system onboard ship. As illustrated with reference again to  FIG. 4 , the hardware interface  36  permits insertion of multiple operator modules, such as a digital signal processor (DSP) module  51  and switch control functions (SCF)  52 . Common modules, such as the DSP module  51  and the SCF module  52  are scalable to operate with tactical interfaces for one or more operators  12 . The hardware interface  36  scales by simply adding additional interface card modules  38  for each additional operator. The software will automatically scale to operate with the number of interface card modules seen on the computer bus. The system  10  accommodates modular upgrades by allowing a CPU module  54  and network interface cards to be upgraded without affecting the design or operation of the rest of the system. All audio information is digitized when it is routed to the DSP. Such a capability permits the system  10  to optionally save and time stamp the audio data for record and playback purposes, a valuable tool in training when reviewing performance for a scenario. Once the data is stored, training exercises that are visually reviewed can be enhanced by audio playback that is GPS time-stamped and synchronized to the events that took place during the exercise. 
   The functions of the modules  38  are further illustrated with reference to the block diagram of  FIG. 5 , and again to  FIG. 4 . The CPU module  54 , earlier described, is a general-purpose processor performing typical commercial off-the-shelf (COTS) processor functions for general-purpose processing and input/output (I/O) control. A network control unit module  56  is a COTS interface for sending and receiving network packets of information across the Wide Area Network (WAN). The DSP module  51 , a COTS interface, stores, converts, and compresses analog audio signals into a digital signal stream. The SCF module  52  controls the switching of audio data between the WAN  50  and the various tactical communications systems  14  onboard ship. An I/O process function module  58  controls the digital I/O interfaces to the tactical systems  14 . A time encoder function module  60  provides a global positioning device (GPS) operation for “time stamping” of audio packets for record and playback purposes. By way of example, the system  10  records and plays back processed audio information and sends this information over the WAN or locally, via on board systems, as desired. 
   A custom signal processor module  62  provides the custom hardware interface  36  to the operational tactical equipment  14  onboard the ship through connection ports  64 , as herein described by way of example. A sound power interface  66  processes the analog signals to and from the sound power telephones (SP)  20 , earlier described with reference to  FIGS. 1 and 2 . A telephone interface  68  processes the analog signals to and from a standard telephone PBX interface, the telephone  22 . A tactical digital Interface  70  processes the digital messages to and from the operational equipment  14  onboard ship. A tactical analog interface  72  processes the analog audio data to and from the operational equipment  14  onboard the ship. An audio pre-conditioner module  74  adjusts the audio levels from the operational equipment  14  to levels acceptable by the digital signal processor module  51 . A digital control unit  76  provides timing information for controlling the custom signal processor  62 . 
   As illustrated with reference again to  FIG. 3 , and to  FIG. 6 , during operation of the system  10 , the BOPC operator  12  establishes audio communications through the pressing of a voice button on a typical BFTT  78 . In the preferred embodiment of the present invention, herein described by way of example, this BFTT voice button pressing action sends a signal to the system  10  which responds by presenting a graphical user interface (GUI)  80  to be presented on the monitor  48 . The GUI  80  allows the operator  12  to configure and control all voice communications to and from his console. The system  10  permits the operator to communicate his voice to either the tactical communication equipment  14  onboard ship, or to the WAN  50  where the operator will typically communicate with other ships taking part in the training exercises. 
   In a preferred embodiment of the present invention, voice data sent and received over the WAN is called scenario control voice (SC) and activated by the SC button  82  in the GUI  80 , as illustrated with reference again to  FIG. 6 . By way of further example, and as herein described, when operating in SC mode, the BOPC operator chooses among four different virtual frequencies labeled channel A, channel B, channel C, and channel D. Additional channels are included as required to meet scenario control requirements. Typically, the BOPC operators from several different ships are all connected to the same WAN and will thus hear SC voice when they are tuned to the same virtual frequency as the sender. Virtual frequency channel A is illustrated in left channel  84  and right channel  86  in the GUI  80  of  FIG. 6 , where the operator  12  has his left and right ear speakers  32 ,  34  tuned to send and receive voice data over the WAN on SC virtual frequency channels A. As described, voice data is also sent and received over the tactical communications equipment  14  onboard ship. 
   Ship communications equipment was described above and is further expanded to provide a brief explanation for the names selected for the GUI buttons  88 , illustrated with reference against to  FIG. 6 . Communications established between two points on a ship is called interphone (IP) communication, thus an IP button  92 . Communications established between three or more points on a ship is called conference (CONF) communications, thus a CONF button  93 . Communications established on one of the ship&#39;s multiple voice networks is referred to as network (NET) communications, thus a NET button  95 . Communications established on the ship&#39;s tactical radios that broadcast over the airways is called tactical radio (TR) communication, thus a TR button  97 . Communication established over the sound powered circuits on a ship is called sound power (SP) communications, thus SP button  99 . Communications established over the telephone circuits on a ship used to connect a ship in port to a commercial phone system is called telephone (PH) communications, thus a PH button  101 . Button names may change without departing from the intent and teachings of the present invention. In addition, the GUI  80  is herein described as one preferred embodiment, but a hardwired structure including real buttons may be preferred depending on an environment in which the system  10  is to be used. 
   In operation, and with reference again to  FIG. 6 , by way of example, the BOPC operator  12  independently configures and controls the audio communication to his left and right ear, and can change his left or right ear to SC mode by depressing the SC button on the IBDV GUI. For the example herein described, consider the operator  12  having the headset  30  and connections as illustrated with reference again to  FIG. 4 . While in the SC mode, the BOPC operator  12  can choose between four virtual frequencies by depressing A, B, C, or D buttons  90  on the GUI  80 . By way of further example, the operator  12  can change his lift or right ear to IP mode by depressing the IP button  92  on the GUI  80 . Further, the system  10  provides a speed-dial menu  94 , as illustrated with reference to  FIG. 7 , to assist the operator in selecting a desired person to call onboard the ship. The system  10  meets TEMPEST requirements for processing both secure and non-secure audio transmissions simultaneously.  FIG. 7 , by way of example, illustrates the GUI  80  for selecting access to the IP system  18  via the operator&#39;s left ear speaker  32 . By way of further example, the speed-dial menu  94  appears and in this example, the operator selected the air intercept controller (AIC) by depressing the AIC button  96 . AIC is indicated in the left channel  84  window of the GUI  80 . The operator  12  would then press the DIAL button  98  and the connection is made to the AIC. In a preferred embodiment, activated buttons of the GUI  80  will be illuminated in varying colors, green for active, by way of example. Further, when the operator changed to an IP circuit, such as illustrated with reference to  FIG. 8 , the IP button  92  illuminates in green to indicate that IP is the selected communication mode, while the SC-Channel A button  82  will turn blue to indicate the SC circuit was on hold. As will now be appreciated, the operator  12  can change his left or right ear to NET, CONF, SP, or PH mode by following a similar procedure as herein described above. 
   In summary, the system  10  provides tactical and non-tactical communications systems onboard a typical U.S. Navy ship (by way of example, Conference, Tactical Radio, Sound Power, and Telephone) to be integrated for communications into a single headset. This enhances the effectiveness of onboard training by allowing the operator to handle all shipboard communications without removing his headset or moving from his console. Wide Area Network communications are also integrated into the same headset. The system not only acts as a communications integrator but also routes audio from one tactical system to either the wide area network, or to another tactical system onboard ship. The system is scalable to handle tactical interfaces for one or more operators as required by the different ship platforms. The hardware scales by simply adding additional interface cards of each additional operator. The software will automatically scale to handle the number of interface cards seen on the computer bus. The system can also accommodate modular upgrades by allowing the processor, DSP, and network interface cards to be upgraded without affecting the design or operation of the rest of the system. Further, since all audio information is digitized when it is routed to the DSP, the system can optionally save and time stamp the audio data for record and playback purposes. With the result that once training data is stored, training exercises that are visually reviewed can be enhanced by audio playback that is GPS time-stamped and synchronized to the events that took place during the exercise. The GUI allows the BOPC operator to configure and control the IBDV for setting up independent communications to the operator&#39;s left ear and right ear, as desired. Further, the GUI is re-configurable to handle the variances that typically appear when interfacing to communication equipment onboard different ship classes in the U.S. Navy. 
   It is to be understood that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size and arrangement of parts within the principle scope of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.