Abstract:
In a channel patching apparatus, an output patch setting part assigns a name to an audio signal of an internal channel of an audio device, which outputs the audio signal to a transmission channel of an audio network. A transmission channel allocation setting part allocates a transmission channel of the audio network to the audio signal assigned the name, and performs setting of the audio device such that the audio signal assigned the name is output from an internal channel associated with the audio signal assigned the name to the allocated transmission channel. An input patch setting part assigns a name that the user has selected from a list of the names assigned to the audio signals, to an internal channel of an audio device of an input side, to which an audio signal from a transmission channel of the audio network is input, and performs setting of the audio device such that an audio signal of a transmission channel corresponding to the selected name is input to the internal channel of the audio device assigned the selected name.

Description:
BACKGROUND OF THE INVENTION 
     1. Technical Field of the Invention 
     The present invention relates to a technology for patching channels of an audio network and channels of each audio device in a network audio system including a plurality of audio devices connected to the network. 
     2. Description of the Related Art 
     Conventionally, an audio system has been implemented by connecting a plurality of audio devices through an audio network through which an audio signal can be transmitted and received in real time and performing allocation (patching) of channels of each device and transmission channels of the audio network. The audio devices connected to the audio network include a device for inputting an audio signal, a device for performing signal processing, a device for outputting an audio signal, etc. These devices are mostly provided as separate units and signal patching between the devices is complicated. 
       FIGS. 9A and 9B  illustrate examples of conventional patch screens. Specifically,  FIG. 9A  illustrates a screen for setting an output patch of a mixer (DSP) (see chapter 3 “Audio Connection and Patching” of Non-patent Reference 1). “MIX 1” to “MIX 16” vertically arranged at the left side of  FIG. 9A  denote respective channels of mix buses in the mixer. Signals of the mix buses are allocated to channels, in which black circles are set, among the channels of a card inserted in an output-side slot of the mixer. An index  901  of “SLOT OUT” represents output-side slots, “1” of index  902  represents a card inserted in a slot # 1 , “1” of index  903  represents a port  1  of the card. For example, a signal of MIX  1  indicated by index  904  is patched to ports  1  and  9  of the card of the slot # 1 . 
       FIG. 9B  illustrates an example screen for setting an input patch of a mixer. An index  921  of “AD IN” represents an analog/digital (AD) input card and “1” of index  922  represents a port  1  of the AD input card. For example, as denoted by index  923 , an input signal of the port  1  of the AD input card is patched so that it is input to an input channel CH 1  of the mixer.
     [Non-patent Reference 1] “CSID CONTROL SURFACE Operation Manual (Basic Operations),” Yamaha Corporation, 2002   

     Problems to be Solved by the Invention 
     When patching is performed in the above manner in a network audio system including a plurality of audio devices connected to common buses (transmission channels), there is a problem in that the system cannot be smoothly configured since the system must be configured while constantly paying attention to devices from which input/output signals are patched and buses to which input/output signals are patched. Especially, in the case of a large-scale system, the number of devices, the number of channels, and the number of buses are very large and it is very difficult to set or manage states of patching only with device names, channel numbers, or bus numbers. The management of patching using channel numbers or bus numbers also has a problem in that repatching upon emergency or the like is not smoothly performed. 
     SUMMARY OF THE INVENTION 
     Therefore, it is an object of the invention to provide a system including a plurality of audio devices connected to an audio network having a plurality of transmission channels capable of transmitting audio signals in real time, which makes it possible to easily perform patching of transmission channels of the audio network and internal channels of each audio device and also to easily perform repatching upon emergency or the like. 
     In order to achieve the above object, the invention provides a channel patching apparatus for a network audio system including a plurality of audio devices connected by an audio network through which audio signals can be transmitted and received by the plurality of audio devices in real time basis, the channel patching apparatus performing allocation of internal channels of each audio device and transmission channels of the audio network. The inventive channel patching apparatus comprises: an output patch setting part that assigns a name defined according to input by a user to an audio signal of an internal channel of an audio device, which outputs the audio signal to a transmission channel of the audio network, among the plurality of audio devices; a transmission channel allocation setting part that allocates a transmission channel of the audio network to the audio signal assigned the name, and that performs setting of the audio device such that the audio signal assigned the name is output from the internal channel associated with the audio signal assigned the name to the allocated transmission channel; and an input patch setting part that assigns a name that the user has selected from a list of the names assigned to the audio signals, to an internal channel of an audio device of an input side, to which an audio signal from a transmission channel of the audio network is input, among the plurality of audio devices, and that performs setting of the audio device such that an audio signal of a transmission channel corresponding to the selected name is input to the internal channel of the audio device assigned the selected name. 
     In an expedient form, the output patch setting part is capable of assigning the same name to different internal channels and assigns different priorities to the internal channels when the same name is assigned to the internal channels. When assigning of the different priorities has been made for the same name, the transmission channel allocation setting part allocates a transmission channel to one of the internal channels assigned the highest priority. 
     In this case, when an audio signal of an internal channel or a transmission channel corresponding to one name has failed to be transmitted due to malfunction, the transmission channel allocation setting part performs allocation of the inner channel and the transmission channel based on assigning of a next priority for the same name if the assigning of the next priority for the same name is present. 
     According to the invention, in a system including a plurality of audio devices connected to an audio network having a plurality of transmission channels capable of transmitting audio signals in real time basis, it is possible to easily perform patching of transmission channels of the audio network and internal channels of each audio device. Since patching can be performed using names assigned by a user, it is possible to easily perform patching without paying attention to device names, channel numbers, bus numbers, or the like. Since a change of a name of a channel, through which a signal is being output to a transmission bus, is automatically reflected to a name of an associated portion, any trouble to change names after patching is done is significantly reduced. In addition, when the same channel name is assigned to a plurality of channels with different priorities being set for the channels, a receiving audio device which receives a signal from a bus is set so as to patch one of the channels of a higher priority. Thus, it is possible to easily make a signal dual. In addition, when a trouble has occurred in a bus or a device of a currently patched name, it is possible to automatically re-patch a channel with the highest priority among channels having the same name as that of the currently patched channel so that the system can effectively operate even upon redundancy or emergency. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  illustrates an overall configuration of a network audio system to which the invention is applied. 
         FIG. 2  illustrates a schematic diagram of a console. 
         FIG. 3  illustrates how patching is performed. 
         FIG. 4  illustrates priority of patching. 
         FIGS. 5A and 5B  are a flow chart illustrating a procedure for setting patching. 
         FIG. 6  is a flow chart illustrating a procedure for performing repatching when emergency occurs. 
         FIG. 7  is a flow chart illustrating a procedure for performing a release process. 
         FIG. 8  is a flow chart illustrating a procedure for performing a process for reassigning a list. 
         FIGS. 9A and 9B  illustrate examples of conventional patch screens. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Embodiments of the invention will now be described with reference to the accompanying drawings. 
       FIG. 1  illustrates an overall configuration of a network audio system to which the invention is applied. A console  101 , AD input units  102  and  103 , a Digital Signal Processor (DSP)  104 , and DA output units  105  and  106  are connected to an audio network (music LAN)  107  having a plurality of transmission channels (transmission buses) which can transmit audio signals in real time. Each of these devices includes a plurality of internal channels for processing audio signals in the device. For example, the AD input unit  102  includes a plurality of input channels for converting analog audio signals from a microphone or the like into digital audio signals, and inputting the digital audio signals and the console  101  includes a plurality of channels for monitoring or controlling audio signals. 
     The following is a typical example of patching of a transmission channel and an internal channel of each device. 
     (1) A signal of a port  1  (an input channel  1 ) of an AD input card of a slot  1  of the AD input unit  102  is allocated to a transmission channel  1  of the audio network  107 . 
     (2) A signal of the transmission channel  1  of the audio network  107  is allocated to a channel  1  of the console  101  to monitor the signal. 
     (3) A signal of the transmission channel  1  of the audio network  107  is allocated to a mixing channel (MIX bus)  1  of the DSP  104  to perform mixing of the signals or impartment of effects on the signals. 
     (4) A signal of the mixing channel  1  of the DSP  104  is allocated to a transmission channel  2  to output the signal. 
     (5) A signal of the transmission channel  2  is allocated to a port  1  (output channel  1 ) of a DA output card of a slot  1  of the DA output unit  105  to output the signal. 
     In this embodiment, patching can be easily performed without paying special attention to channel numbers or the like of the console  101 . Specifically, a manual operation is performed on the console  101  to display an input patch or output patch screen (described below) of each device on a display unit  208 , and control pieces are operated to change setting of patching on the screen. 
       FIG. 2  illustrates a schematic configuration of the console  101  of  FIG. 1 . The console  101  includes a Central Processing Unit (CPU)  201 , a Random Access Memory (RAM)  202 , a Read Only Memory (ROM)  203 , a detection circuit  205 , an operating unit  206 , a display circuit  207 , a display unit  208 , and a communication interface (I/F)  209 . 
     The CPU  201  is a processing unit for controlling the overall operation of the console. The RAM  202  is a volatile memory in which a program to be executed by the console  101  is loaded and a variety of work regions are secured. The ROM  203  is a nonvolatile memory in which a startup routine that is activated when power is supplied, a Basic Input/Output System (BIOS) that is responsible for low level I/O processes, or the like are stored. The operating unit  206  includes control pieces such as buttons, switches, knobs, and faders mounted on an external panel of the console. An operation of the operating unit  206  is detected by the detection circuit  205  and the detection result is transmitted to the CPU  201 . The display unit  208  is a display mounted on the external panel to display a variety of information. The display circuit  207  displays given data on the display unit  208  based on an instruction from the CPU  201 . The communication interface  209  is an interface for connection to the audio network  107 . 
       FIG. 3  illustrates how patching is performed in this embodiment. In  FIG. 3 , reference numeral “301” denotes an example screen for performing output patching of the AD input unit  102 . Channel fields “Out 1” to “Out 8” correspond respectively to input ports (channels) in the AD input unit  102 , and an audio signal input source such as a microphone is connected to each of these ports. Name fields represent names that a user has arbitrarily assigned to the channels. Each name field is blank by default, and the user arbitrarily enters a name in a name field for a channel that is determined to be used by connecting a microphone or the like thereto. In this system, basically, unique names are set in the name fields. However, a plurality of identical names may also be set in a name field. In this case, different values are set in priority fields described below. Integer values of 0 to 10 are set in the priority fields. The value “0” corresponds to the lowest priority and the value “10” corresponds to the highest priority. When the same name is set for a plurality of channels, it is necessary to set different priority values. Check boxes of the channels, which are unchecked by default, are set in system bus fields. A transmission channel (transmission bus) of the audio network  107  is automatically allocated to each checked channel while no transmission bus is allocated to each unchecked channel. A signal of a checked channel is transmitted to a transmission bus allocated to the checked channel. When the user has entered a name in a name field, a system bus field of a corresponding channel is automatically checked and a transmission bus is allocated to the channel. When the system bus field is unchecked, the transmission bus allocated to the corresponding channel becomes a blank bus. 
     Reference numeral “302” denotes example bus numbers of transmission buses that have been automatically allocated. Although these bus numbers are those of transmission buses that have been automatically allocated from among blank transmission buses by the console  101  that manages patching of the transmission buses, the user is not notified of the bus numbers as internal information stored in the console  101 . On the screen  301 , the user enters a name of each channel and checks a system bus field to allocate the channel to a transmission bus. When a system bus field of a channel is unchecked, a bus number field corresponding to the channel is marked with “-” since no transmission bus is allocated to the channel. Information representing association between each channel and a transmission bus number allocated to the channel is transmitted from the console  101  to a corresponding device (the AD input unit  102  in this example) at an appropriate time (for example when a request to terminate setting of the output patch using the screen is issued). When this information is received, the AD input unit  102  performs internal setting so that a signal of each channel (input port) is transmitted to a transmission bus corresponding to a bus number allocated to the channel. 
     Reference numeral “303” denotes an example screen for performing output patching of the AD input unit  103 , similar to the reference numeral “301.” “304” denotes internal information representing allocation of bus numbers. The console  101  integrates the information  302  and  304  to create a mapping table  310  between names and bus numbers. Each bus number field lists all bus numbers, which have been assigned the same name, together with respective priorities. In each bus number field of the mapping table  310  shown in  FIG. 3 , a priority value in parentheses is written after a bus number. When a plurality of bus numbers is assigned the same name, the bus numbers are written in decreasing order of priority and are separated by commas. For example, “27(10), 28(9)” is written in a bus number field of “Vocal Main,” which indicates that a bus number of “27” has been allocated with priority “10” and a bus number of “28” has been allocated with priority “9.” 
     Reference numeral “312” denotes an example screen for performing setting of an input patch of the console (specifically, setting of allocation of a signal of each transmission bus to a corresponding internal channel of the console). “Ch1” to “Ch8” in channel fields denote internal channels (for monitoring) of the console  101 . The name fields are blank by default. When this input patch setting is performed, names are read from the mapping table  310  to display a name list denoted by “311.” The user can assign an arbitrary name, selected from the list  311  on the screen, to a name field of each channel of the screen  312 . Accordingly, the corresponding internal channel of the console  101  is patched to a signal of the assigned name. For example, it can be seen that “MC Main” is assigned to “Ch1” and a signal of “MC Main” is input from a transmission bus corresponding to a bus number of “25” in the mapping table  310 . Accordingly, mapping information  313  between the internal channels of the console  101  and the transmission bus numbers is created. When the input patch of the console  101  has been established, the console  101  performs the setting of inputting of a signal from each transmission bus number to a corresponding internal channel of the console  101  according to the internal information  313 . 
     Although the above description has been given with reference to the output patch of the AD unit and the input patch of the console as an example, the same method is applied to other devices connected to the audio network  107  of  FIG. 1 . In this case, setting of the output of a signal from the device to the audio network  107  may be performed using the same setting method as the output patch described above with reference to  FIG. 3 , and setting of the input of a signal from the audio network  107  to the device may be performed using the same setting method as the input patch described above with reference to  FIG. 3 . 
     As described above, the user can perform patching using names arbitrarily assigned to channels and does not need to be aware of any specific bus numbers of transmission buses which are used to transmit and receive signals. Accordingly, the user can perform patching without the need to pay attention to channel numbers or bus numbers. In addition, only one name is assigned to a transmission bus and an internal channel of each device. Therefore, for example, when a name of an internal channel assigned in an output patch is changed, a name of a transmission bus and a name in an input patch is also automatically changed following the name of the internal channel. Namely, the change of the name assigned to the audio signal is automatically reflected to the corresponding ones of internal channels and transmission channels. 
       FIG. 4  illustrates priority of patching. As described above with reference to  FIG. 3 , when the same name is assigned to a plurality of signals while the priority values of the plurality of signals are different, a signal with a higher priority value is patched preferentially (i.e., first). For example, as denoted by “401,” the same name “Vocal Main” has been set for the channel fields “Out 3” and “Out 4” of the AD input unit  102  and corresponding system bus fields have been checked. Accordingly, signals of “Out 3” and “Out 4” are transmitted to transmission buses allocated thereto (transmission buses of the bus numbers  27  and  28  as shown in  FIG. 3 ). On the other hand, for example, as denoted by  402 , when a name “Vocal Main” has been selected from a list in an input patch  403  of the console  101  and the selected name has been assigned to a channel  3 , a signal with the higher priority value is patched preferentially. Accordingly, a signal input from the transmission bus of the bus number  27  (to which the channel field “Out 3” with priority  10  has been allocated in the output patch  301 ) is allocated to the channel  3  of the console  101  as can be seen from the channel  3  of the input patch  312  in  FIG. 3 . 
     Setting priorities in this manner has a variety of advantages. For example, when it is detected that a signal cannot be received from a current patching target due to some trouble, re-patching is automatically performed if an allocation of the same name with the next highest priority is present, thereby preventing the processing from being interrupted. For example, in the example of  FIG. 4 , when a signal cannot be received from the channel “Out 3” of the AD input unit  102 , this system automatically performs allocation of the next priority (i.e., a process for re-patching to the channel “Out 4”). Therefore, there is a need to perform setting, for example, such that a signal from a microphone of the same name “Vocal Main” is output from the channels “Out 3” and “Out 4” or such that a signal of a microphone for backup, other than that of the channel “Out 3,” is output from the channel “Out 4.” 
       FIG. 5A  is a flow chart illustrating a procedure for setting output patching in the console  101 . Here, it is assumed that a device for performing setting of output patching is specified and a screen such as the screen  301  or the screen  303  of  FIG. 3  for the device is displayed. This procedure is activated when a new name is entered in a (blank) name field of an internal channel on the screen and a corresponding system bus field is automatically checked, or when a system bus field corresponding to an internal channel of a filled name field is switched from an unchecked state to a checked state. At step  501 , usage states of transmission buses are acquired. When it is determined at step  502  that a blank transmission bus assigned no channel is present, the corresponding internal channel of the corresponding device is assigned to the blank transmission bus according to an instruction from a user at step  503 , and information regarding transmission buses is updated at step  504  and the procedure is then terminated. When it is determined that no blank transmission bus is present, an error is displayed at step  505  and the procedure is then terminated. Step  504  is a process for updating the usage states of transmission buses such as the mapping table  310  and the internal information such as the information  302  and  304  in  FIG. 3 . 
       FIG. 5B  is a flow chart illustrating a procedure for setting input patching in the console  101 . Here, it is assumed that a device for performing setting of input patching is specified and a list  311  and a screen such as the screen  312  of  FIG. 3  for the device are displayed. This procedure is activated when a name selected from the list  311  is entered in a (blank) name field of a channel on the screen. At step  511 , usage states of transmission buses are acquired. At step  512 , it is determined whether or not a plurality of buses with the same name is present. In this process, the mapping table  310  is searched using the name entered in the name field to check whether or not a plurality of bus numbers has been assigned. When only one bus number has been assigned, a bus having the name is assigned to an input channel of the device at step  513  and information of transmission buses is updated at step  515  and the procedure is then terminated. When a plurality of buses has been assigned, a bus with the highest priority is selected to be assigned from among the buses having the same name at step  514  and the procedure then proceeds to step  515 . 
       FIG. 6  is a flow chart illustrating a procedure for performing repatching when emergency occurs. This procedure is activated when a transmission bus or a channel of each device has malfunctioned. Here, it is assumed that the procedure is performed by the console  101 . At step  601 , setting states of transmission buses are acquired. Then, at step  602 , it is determined whether or not any bus with the same name as a bus of a transmission bus number where a malfunction has occurred (or a transmission bus number corresponding to a channel of the device where a malfunction has occurred) is present. This determination can be made with reference to the mapping table  310 . If any bus with the same name as the bus where a malfunction has occurred is present, a bus with the next highest priority to the current priority is selected from buses of the same name as that of the currently patched bus at step  603 . A channel of the device is reassigned to the selected bus at step  604  and information of transmission buses is updated at step  605  and the procedure is then terminated. If no bus with the same name is present, an error is displayed at step  606  and the procedure is then terminated. 
       FIG. 7  is a flow chart illustrating a release procedure performed to release a transmission bus that has been assigned. This procedure is activated when a name of a transmission bus to be released is specified from among names registered in the mapping table  310 . At step  701 , it is determined whether or not the name has been assigned in an input patch of a device. When the name has not been assigned, the assignment of the name to a transmission bus is released at step  702  and information of transmission buses is updated at step  703  and the procedure is then terminated. Accordingly, assignment data of the name is removed from the mapping table  310  and a patch of each device that has used a transmission bus of the name is also removed. When it is determined at step  701  that the name has been assigned, an instruction as to whether or not the assignment may be released is received from a user at step  704 . If the assignment may be released, the procedure proceeds to step  702 . In  FIG. 7 , “711” denotes an example screen displayed when the instruction is received from the user at step  704 . If the assignment may not be released, a warning is displayed at step  705  and the procedure is terminated. 
       FIG. 8  is a flow chart illustrating a procedure for reassigning a list. This procedure is an example replacement of the procedure of  FIG. 5A . In the procedure of  FIG. 5A , an error is displayed when no blank transmission bus is present. However, in the procedure of  FIG. 8 , the user is prompted to select a transmission channel that may be released and assignment is made to the selected transmission channel. A description of steps  801  to  804  is omitted herein since steps  801  to  804  correspond respectively to the above steps  501  to  504  of  FIG. 5A . When it is determined at step  802  that no blank transmission bus is present, a screen  811  is displayed to ask the user whether or not to release a currently assigned transmission channel to create a blank transmission channel. When “Yes” is selected, at step  805 , a screen  812  is displayed to prompt the user to select a transmission channel to be released. A list displayed on the screen  812  is a list of names that have been registered in the mapping table  310  at that time (i.e., a list of names to which transmission channels have been allocated). When the user selects a transmission channel to be released on this screen, the selected transmission channel is released at step  806  (i.e., assignment of the transmission channel is released to create a blank channel). Then, at step  807 , it is determined whether or not any released channel is present. If any released channel is present, the procedure proceeds to step  803 , otherwise a warning is displayed at step  808  and the procedure is then terminated.