JPH09200162A - Audio signal controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent production of unexpected howling by interrupting transmission of a voice signal through a signal line when it is discriminated that signal supply' source information and signal supply destination information are the same so as to save man-hours of the operation. SOLUTION: When a talker A utters a voice to a microphone 34, the microphone 34 transduces the voice signal into an electric signal. The transduced electric signal is fed to an A/D converter 35. The A/D converter 35 converts the received analog signal into a digital signal. The digital signal obtained by conversion is fed to a channel input terminal 2 of the voice signal controller 1. When a discrimination means of the voice signal controller 1 discriminates it that signal supply source information and signal supply destination information are the same, the transmission of a signal line through the voice signal is controlled to be interrupted. Thus, the received voice signal in this case is not outputted from a voice monitor output terminal 29 of the voice signal controller 1 and then no monitor voice of the talker A is not heard from a monitor speaker 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal control device used for a digital audio adjusting console for adjusting audio of a program broadcast at a broadcasting station, for example.

[0002]

2. Description of the Related Art Conventionally, in a broadcasting station, an audio adjusting console has been used for adjusting audio when producing a broadcast program. For example, when a broadcast program is broadcast while forming a conversation with a relay destination, the output signal of the speaker at the relay destination is input to an audio adjustment console of a studio in a broadcasting station that mainly shoots the broadcast program. , Is mixed with other input signals and broadcast in the actual program.

At this time, an audio monitor output signal is output from the above-mentioned audio adjustment console to the monitor speakers arranged around the speaker at the relay destination. This allows
The speaker at the relay destination can hear the monitor sound from the monitor speaker. However, if the speaker's own voice is included in the monitor output, the monitor speaker may cause howling. Alternatively, if the speaker's own voice is included in the monitor output, there is a difference between the voice directly heard by the speaker and the speaker may feel discomfort. Therefore, the output signal obtained by deleting the voice input from the relay destination by the operation is usually used as the voice monitor output signal to the speaker at the relay destination.

Alternatively, a broadcasting station may form a star-type network and perform broadcasting while forming a conversation with a studio of another broadcasting station in a program. At this time,
The output from its own studio and the output from other broadcasting stations are supplied to the audio adjustment console in the studio of the broadcasting station, which is the center of the star, and they are mixed and actually broadcast.

An audio monitor output signal is output from the above-mentioned audio adjusting console to the monitor speakers arranged in the studio of each broadcasting station. As a result, in the studio of each broadcasting station, the monitor sound can be heard from the monitor speaker. However, if the voice from your studio is included in the monitor output, the monitor speaker may cause howling. Alternatively, if the voice from the own studio is included in the monitor output, there is a difference between the voice directly heard in the own studio and the speaker may feel discomfort. Therefore, the output signal obtained by deleting the audio input from the own studio by the operation is usually used as the audio monitor output signal to the studio.

[0006] In the audio adjusting method as described above, the bus assigning switch for switching the output to a plurality of bus lines is actually switched on the audio adjusting desk based on the material determined for each program. It is done by

[0007]

In such a conventional voice control desk, when the voice monitor output signal is output from the voice control desk to the speaker at the relay destination, the speaker's own voice enters during monitor output. Monitor may cause howling. Alternatively, if the speaker's own voice is included in the monitor output, there is a difference between the voice directly heard in the ear and the speaker may feel discomfort. For this reason, normally, the output signal obtained by deleting the voice input from the relay destination by the operation must be used as the voice monitor output signal to the speaker at the relay destination, and an extra operation for this is required. was there.

Further, when the broadcasting station forms a star type network, if the voice from the own studio is included in the monitor output, the monitor speaker may cause howling. Alternatively, if the voice from the own studio is included in the monitor output, there is a difference between the voice directly heard in the own studio and the speaker may feel discomfort. For this reason, normally, an output signal obtained by deleting the audio input from the own studio by an operation must be used as an audio monitor output signal to the studio, which causes an inconvenience that an extra operation is required.

The present invention has been made in view of the above points, and an object of the present invention is to provide an audio signal control device which automatically cuts off an outgoing audio signal when the signal supply source and the signal supply destination are the same. And

[0010]

The audio signal control apparatus according to the present invention comprises a conversion means for converting a specific signal format having information indicating a signal supply source and a signal supply destination of the supplied audio signal into an internal format. A signal line for transmitting the voice signal converted by the converting means by a plurality of lines;
Converts the audio signal transmitted by the signal line from the internal format to a specific signal format, and confirms whether the inverse conversion means for writing new signal supply destination information and the signal supply source information and the signal supply destination information are the same. When the discriminating means for discriminating and the discriminating means discriminate that the signal supply source information and the signal supply destination information are the same, the transmission of the audio signal through the signal line is cut off.

The audio signal control device of the present invention has the following operations. When the AES / EBU format digital audio signal is supplied to the channel input terminal of the audio signal control device, the AES / EBU format digital audio signal is converted to AES / EBU format conversion means.
It is supplied to the EBU decoder. The AES / EBU decoder demodulates a digital audio signal of AES / EBU format into a serial audio signal.

A supplied to the AES / EBU decoder
The digital audio signal in the ES / EBU format is also supplied to the channel status recognition section and the control section as the discrimination means. The channel status recognition unit and the control unit use the internal source ID detection unit to detect the source I
D is detected and stored in the internal channel status memory.

The demodulated serial audio signal is supplied to the signal processing section. The signal subjected to the signal processing is supplied to the bus assign switch. The bus assign switch is provided for each bus line, and switches the line assignment of each bus. In this example, four bus assign switches are provided for each of the four bus lines.

By switching the bus assign switch,
When a line of a certain bus is assigned, the audio signal is supplied to the AES / EBU encoder as the inverse conversion means. The AES / EBU encoder modulates a digital serial signal into a digital audio signal of AES / EBU format. The digital audio signal modulated in the AES / EBU format is AES / EB
It is supplied to the U output terminal.

Further, the digital audio signal modulated in the AES / EBU format is supplied to the channel status recognition section and the control section. Channel status recognition unit and control unit are the destination ID
The detection unit detects the destination ID and stores it in the channel status memory. The channel status recognition unit and the control unit compare the source ID and the destination ID stored in the channel status memory with the comparator.

Source ID and Destination I
When D is the same, the bus assign switch control signal generator generates a bus assign switch control signal for the line of the corresponding bus. The bus assign switch control signal generated by the bus assign switch control signal generation unit is supplied to the control terminal of the bus assign switch of the line of the corresponding bus. This bus assign switch control signal turns off the bus assign switch of the line of the corresponding bus.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, FIG. 2 shows the configuration of an audio signal control system using the audio signal control device of this embodiment. The audio signal control device of this example is used, for example, in a digital audio adjusting console that adjusts the audio of a program broadcast at a broadcasting station.

First, the structure of the audio signal control system will be described below. In FIG. 2, the audio signal control system is
The microphone 34, the A / D converter 35, the audio signal control device 1, the amplifier 36, the monitor speaker 37,
And an external switcher 38. Audio signal control device 1
Is the channel input terminal 2, the other input terminal 15,
Program output terminal 14 and audio monitor output terminal 26
And an audio monitor output terminal 29 and an audio monitor output terminal 32.

Here, the audio signal control device 1 is internally provided with
A conversion means for converting a specific signal format having information indicating a signal supply source and a signal supply destination of the supplied audio signal into an internal format; and a signal line for transmitting the audio signal converted by the conversion means through a plurality of lines. , Whether or not the inverse conversion means for converting the audio signal transmitted by the signal line from the internal format to a specific signal format and writing new signal supply destination information is the same as the signal supply source information and the signal supply destination information And a determining means for determining.

Next, the connection relationship will be described. The microphone 34 is connected to the channel input terminal 2 of the audio signal control device 1. The audio monitor output terminal 14 of the audio signal control device 1 is connected to the amplifier 36. The amplifier 36 is connected to the monitor speaker 37. The microphone 34 and the monitor speaker 37 are arranged near the speaker A. The audio monitor output terminal 32 of the audio signal control device 1 is connected to the external switcher 38. The external switcher 38 is connected to the other input terminal 15 of the audio signal control device 1.

The operation of the audio signal control system thus configured will be described below. When the speaker A generates a voice in the microphone 34, the microphone 34 converts the voice into an electric signal. The electric signal converted by the microphone 34 is supplied to the A / D converter 35. The A / D converter 35 converts the supplied analog signal into a digital signal. The converted digital signal is supplied to the channel input terminal 2 of the audio signal control device 1. The audio signal control device 1 controls so as to cut off the transmission of the audio signal through the signal line when the determining means determines that the signal supply source information and the signal supply destination information are the same.

That is, when the audio signal output from the audio signal control device 1 via the microphone 34 returns to the same audio signal control device 1 via the monitor speaker 37 and the microphone 34, the audio signal Signal control device 1
The transmission of this audio signal is blocked inside the. Therefore, at this time, the input voice signal is not output from the voice monitor output terminal 29 of the voice signal control device 1, and the monitor voice of the speaker A cannot be heard from the monitor speaker 37. As a result, there is no automatic occurrence of unexpected howling in a relay program or an internet program.

When the speaker A produces a voice in the microphone 34, the microphone 34 converts the voice into an electric signal. The electric signal converted by the microphone 34 is supplied to the A / D converter 35. The A / D converter 35 converts the supplied analog signal into a digital signal. The converted digital signal is supplied to the channel input terminal 2 of the audio signal control device 1.

Here, originally, this audio signal is sent from the audio monitor output terminal 32 to the outside via the external switcher 38. However, due to an operation error in the external switcher 38 or the like, the external switcher 38 inputs to the other input terminals. In some cases, it may return to the audio signal control device 1 via 15.

At this time, when the discriminating means discriminates that the signal supply source information and the signal supply destination information are the same, the audio signal control device 1 controls so as to cut off the transmission of the audio signal through the signal line. .

That is, when the voice signal output from the voice signal control device 1 returns to the same voice signal control device 1, the transmission of the voice signal is cut off inside the voice signal control device 1. To do so. Therefore, at this time, the input audio signal is not output from the audio monitor output terminal 32 of the audio signal control device 1 and is not input from the external switcher 38 via the other input terminal 15. As a result, there is no automatic occurrence of unexpected howling in a relay program or an internet program.

The audio signal control device of this embodiment of the present invention will be described in detail below. FIG. 1 is a block diagram showing the configuration of the audio signal control device of this embodiment. First, the configuration of the audio signal control device will be described below. In FIG. 1, the audio signal control device 1 includes a channel input terminal 2 and
AES / EBU decoder 3, signal processing unit 4, channel fader 5, mute switch 6, bus assign switches 7, 8, 9, 10 and other input terminals 1
5, AES / EBU decoder 16, and signal processing unit 1
7, fader 18, mute switch 19, bus assign switches 20, 21, 22, 23, and bus 1
1, a master fader 12, an AES / EBU encoder 13, an AES / EBU output terminal 14, a master fader 24, and an AES / EBU encoder 2
5, AES / EBU output terminal 26, master fader 27, AES / EBU encoder 28, AE
S / EBU output terminal 29 and master fader 30
, AES / EBU encoder 31, and AES / EB
It has a U output terminal 32 and a channel status recognition unit and control unit 33.

Here, the AES / EBU decoders 3, 1
Reference numeral 6 is a conversion means for converting a specific signal format having information indicating a signal supply source and a signal supply destination of the supplied audio signal into an internal format, and a bus 11 transmits the audio signal converted by the conversion means through a plurality of lines. Signal line, AES / EBU encoder 13, 25, 28, 3
1, converts the audio signal transmitted by the signal line from an internal format to a specific signal format,
The inverse conversion means for writing new signal supply destination information, the channel status recognition section and the control section 33 constitute a determination means for determining whether or not the signal supply source information and the signal supply destination information are the same.

Next, the connection relationship will be described. The channel input terminal 2 is connected to the AES / EBU decoder 3.
The AES / EBU decoder 3 is connected to the signal processing unit 4. The signal processor 4 is connected to the channel fader 5. The channel fader 5 is connected to the mute switch 6. The mute switch 6 is connected to the bus assign switches 7, 8, 9, 10. The bus assign switches 7, 8, 9, 10 are connected to the bus 11.

The other input terminal 15 is connected to the AES / EBU decoder 16. AES / EBU decoder 1
6 is connected to the signal processing unit 17. The signal processor 17 is connected to the fader 18. The fader 18 is connected to the mute switch 19. The mute switch 19 is connected to the bus assign switches 20, 21, 22, 23. The bus assign switches 20, 21, 22, 23 are connected to the bus 11.

The bus 11 is connected to the master fader 12. The master fader 12 is connected to the AES / EBU encoder 13. The AES / EBU encoder 13 is connected to the AES / EBU output terminal 14. The bus 11 is connected to the master fader 24. The master fader 24 is connected to the AES / EBU encoder 25. AES / EBU encoder 25 is AES
/ EBU output terminal 26 is connected. The bus 11 is connected to the master fader 27. Master fader 2
7 is connected to the AES / EBU encoder 28. A
The ES / EBU encoder 28 is connected to the AES / EBU output terminal 29. Bus 11 is master fader 3
Connected to 0. Master fader 30 is AES / E
It is connected to the BU encoder 31. The AES / EBU encoder 31 is connected to the AES / EBU output terminal 32.

The channel status recognition unit and control unit 33 is connected to the AES / EBU decoders 3 and 16. The channel status recognition unit and the control unit 33 use the bus assign switches 7, 8, 9, 10, 20, 21, 2
It is connected to the control terminals 2 and 23. The channel status recognition unit and control unit 33 is connected to the AES / EBU encoders 13, 25, 28 and 31.

Next, a digital audio signal of AES / EBU format used in the audio signal control apparatus of this embodiment will be described. FIG. 3 is a diagram showing a digital audio signal of AES / EBU format used in the audio signal control device of this embodiment. As shown in FIG.
One frame 39 of the digital audio signal of AES / EBU format has a sampling frequency of 48 [KH
z] and the sampling cycle is 20.83 [μsec]. One frame 39 includes a subframe A40 and a subframe B41. When used in the stereo mode, the subframe A40 has information on the left channel and the subframe B41 has information on the right channel. Here, one subframe A40 will be described.

The subframe A40 is composed of 32-bit data. Subframe A40 includes sync 42, auxiliary / audio 43, and audio data 4
4, audio sample validity bit 45, user bit 46, audio channel status bit 47, subframe parity bit 48.

The sync 42 is 4-bit data, and is a preamble part that defines synchronization between subframes and frames and channel status block identification. The auxiliary / audio 43 is 4-bit data and is an auxiliary data section. The audio data 44 is 2
0 bit data, August / Audio 4
Together with 3, a maximum of 24 bits can be used. When the audio data 44 is 20 bits, the first 4 bits can be used as an auxiliary data part. LS not used when the audio data 44 is less than 20 bits
The lower bit on the B side is set to "0".

Audio sample validity bit 4
Reference numeral 5 is 1-bit data, which is data indicating the validity of the audio data 44. "0" if the audio data 44 is valid data, "1" if it is invalid data
Is transmitted. The user bit 46 is 1-bit data and transmits data defined by the user. The user bit 46 can also use a block structure like the channel status data.

Audio channel status bit 4
Reference numeral 7 is 1-bit data which forms a data block and transmits transmission information about various parameters.
For each channel, one block is formed by the channel status bits included in consecutive 192 frames. The start position of the block is specified by the above-mentioned preamble part. The subframe parity bit 48 is 1-bit data and has even parity for all data except the preamble part.

FIG. 4 shows the channel status block format. Data blocks are consecutive 192
It is formed by the channel status bits or user bits in the frame. Therefore, the size of the block is 192 bits and 24 bytes. Here, only the characteristic parts of this embodiment will be described, and the other parts will be omitted. In FIG. 4, a source ID 49 indicating a signal supply source is defined in a 4-byte portion from byte 6 to byte 9. Also, 4 from byte 10 to byte 13
A destination ID 50 indicating a signal supply destination is defined in the byte portion.

Here, the AES / EBU decoders 3, 1
6 has a PLL section and a decoder section. The PLL unit extracts a clock for each subframe of the digital audio signal of AES / EBU format. The decoder unit demodulates each subframe unit into serial data of NRZ code.

The channel status recognition section and control section 33 detects the source ID detection section for detecting the 4-byte portion from byte 6 to byte 9 of the channel status data, and the 4-byte portion from byte 10 to byte 13 of the channel status data. It has a destination ID detector, a channel status memory, a comparator, and a bus assign switch control signal generator. The channel status recognition unit and the control unit 33 may be configured by a CPU.

AES / EBU encoders 13, 25,
Reference numerals 28 and 31 write channel status data and user bit data, and modulate a digital serial signal into a digital audio signal of AES / EBU format.

The audio signal control device of this embodiment having the above-described structure operates as follows. FIG. 5 is a flowchart showing the operation of the audio signal control device of this embodiment. The example shown in FIG. 5 shows an operation in the case where an audio signal output from this audio signal control device via a microphone returns to the same audio signal control device via a monitor speaker and a microphone, for example.

As shown in FIG. 2, the speaker A uses the microphone 34.
When a voice is generated, the microphone 34 converts the voice into an electric signal. The electric signal converted by the microphone 34 is supplied to the A / D converter 35. The A / D converter 35 converts the supplied analog signal into a digital audio signal of AES / EBU format. The converted digital audio signal is supplied to the channel input terminal 2 of the audio signal control device 1.

When a digital audio signal of AES / EBU format is supplied to the channel input terminal 2 of the audio signal control device 1 shown in FIG. 1, the digital audio signal of AES / EBU format is AES / EBU.
It is supplied to the decoder 3. The AES / EBU decoder 3 demodulates a digital audio signal of AES / EBU format into a serial audio signal.

A supplied to the AES / EBU decoder
The digital audio signal in the ES / EBU format is also supplied to the channel status recognition unit and control unit 33. Channel status recognition unit and control unit 3
3 is the internal source ID in step S1 of FIG.
The source ID is detected by the detector and stored in the internal channel status memory.

The demodulated serial audio signal is supplied to the signal processing section 4. The signal processing unit 4 performs trimming,
It has an equalizer and a filter to reduce noise and process it into sound that fits the screen.

The signal processed signal is supplied to the channel fader 5. The channel fader 5 attenuates the channel, that is, the switching portion when the line of the bus 11 is switched. The mute switch 6 turns off the sound of a predetermined sound signal. The bus assign switches 7, 8, 9 and 10 are provided for each line of the bus 11 and switch the line assignment of each bus 11. In this example, four bus assign switches 7, 8, 9, 10 are provided corresponding to each line of the four buses 11.

When the bus assign switch 9 is turned on and the bus assign switches 7, 8 and 10 are turned off to switch the lines of the third bus, the audio signal is supplied to the master fader 27. . The master fader 27 attenuates the audio signal of this line. The audio signal is sent via AES / E via the master fader 27.
It is supplied to the BU encoder 28. The AES / EBU encoder 28 converts the digital serial signal into AES /
Modulate to a digital audio signal of EBU format. The digital audio signal modulated in the AES / EBU format is supplied to the AES / EBU output terminal 29.

The digital audio signal modulated in the AES / EBU format is supplied to the channel status recognition section and control section 33. In step S2 of FIG. 5, the channel status recognition unit and control unit 33 detects the destination ID by the destination ID detection unit and stores it in the channel status memory. In step S3 of FIG. 5, the channel status recognition unit and control unit 33 compares the source ID and destination ID stored in the channel status memory with the comparator. If both are not the same here, steps S1 to S3
repeat.

Source ID and Destination I
When D is the same, the bus assign switch control signal generation unit generates a bus assign switch control signal for the line of the corresponding bus 11. The bus assign switch control signal generated by the bus assign switch control signal generation unit is supplied to the control terminal of the bus assign switch 9 of the line of the corresponding bus 11. By this bus assign switch control signal, the bus assign switch 9 of the line of the corresponding bus 11 is turned off in step S4 of FIG.

Therefore, at this time, the input voice signal is not output from the voice monitor output terminal 29 of the voice signal control device 1, and the monitor voice of the speaker A cannot be heard from the monitor speaker 37 shown in FIG. become. As a result, there is no automatic occurrence of unexpected howling in a relay program or an internet program.

According to the above example, this audio signal control device 1
Are AES / EBU decoders 3 and 16 as conversion means for converting a specific signal format having information indicating a signal supply source and a signal supply destination of the supplied audio signal into an internal format, and audio converted by the conversion means. Bus 11 as a signal line for transmitting signals by a plurality of lines
And an AE as an inverse conversion means for converting a voice signal transmitted by a signal line from an internal format to a specific signal format and writing new signal supply destination information.
The S / EBU encoders 13, 25, 28 and 31 are provided with a channel status recognition unit and a control unit 33 as a determination unit that determines whether the signal supply source information and the signal supply destination information are the same. When it is determined that the signal supply source information and the signal supply destination information are the same, the transmission of the voice signal through the signal line is cut off, so that the voice signal can be automatically transmitted. It is possible to save labor and prevent unexpected howling from occurring in relay programs and online programs.

Further, according to the above example, in the audio signal control device 1, in the above description, the specific signal format is the AES / EBU format of the digital audio signal, and the signal source information and the signal destination information are Since the source ID and the destination ID in the channel status signal are used, the signal supply source and the signal supply destination of the input audio signal can be discriminated, and the audio signal can be automatically transmitted, which saves the operation. Therefore, it is possible to prevent unexpected howling from occurring in relay programs and online programs.

Further, according to the above example, in the audio signal control device 1, in the above description, the interruption of the transmission of the audio signal by the signal line is assigned to the bus 11 as a signal line by a bus assign provided for each of a plurality of lines. Switches 7, 8, 9, 10, 2
Since 0, 21, 22, and 23 are cut off, the audio signal can be automatically transmitted without adding another switch, so that the labor saving of the operation can be achieved and the relay program or , It is possible to prevent unexpected howling and the like from occurring in online programs.

FIG. 6 is a flow chart showing the operation of the audio signal control device of another example. The example shown in FIG. 6 shows the operation in the case where the audio signal output from the audio signal control device returns to the same audio signal control device.

That is, as shown in FIG. 2, this audio signal is originally sent from the audio monitor output terminal 32 to the outside via the external switcher 38. However, due to an operation error in the external switcher 38, etc. This is a case where the external switcher 38 returns to the audio signal control device 1 via the other input terminal 15.

As shown in FIG. 2, when the speaker A generates a voice in the microphone 34, the microphone 34 converts the voice into an electric signal. The electric signal converted by the microphone 34 is supplied to the A / D converter 35. The A / D converter 35 converts the supplied analog signal into a digital audio signal of AES / EBU format. The converted digital audio signal is supplied to the channel input terminal 2 of the audio signal control device 1.

When a digital audio signal of AES / EBU format is supplied to the channel input terminal 2 of the audio signal controller 1 shown in FIG. 1, the digital audio signal of AES / EBU format is AES / EBU.
It is supplied to the decoder 3. The AES / EBU decoder 3 demodulates a digital audio signal of AES / EBU format into a serial audio signal.

A supplied to the AES / EBU decoder
The digital audio input signal in the ES / EBU format is also supplied to the channel status recognition unit and control unit 33. In step S5 of FIG. 6, the channel status recognition unit and control unit 33 detects the source ID of the input signal by the internal source ID detection unit and detects the destination ID of the input signal by the internal destination ID detection unit. , Stored in internal channel status memory.

The demodulated serial audio signal is supplied to the signal processing section 4. The signal processing unit 4 performs trimming,
It has an equalizer and a filter to reduce noise and process it into sound that fits the screen.

The signal processed signal is supplied to the channel fader 5. The channel fader 5 attenuates the switching portion when the channel is switched. The mute switch 6 turns off the sound of a predetermined sound signal. The bus assign switches 7, 8, 9 and 10 are provided for each line of the bus 11 and switch the line assignment of each bus 11. In this example, four bus assign switches 7, 8, 9, 10 are provided corresponding to each line of the four buses 11.

Turn on the bus assign switch 10,
When the bus assign switches 7, 8 and 9 are turned off and switched to assign the line of the fourth bus, the audio signal is supplied to the master fader 30. The master fader 30 attenuates the audio signal of this line. The audio signal is sent via AES / E via the master fader 30.
It is supplied to the BU encoder 31. The AES / EBU encoder 31 converts the digital serial signal into AES /
Modulate to a digital audio signal of EBU format. The digital audio signal modulated in the AES / EBU format is supplied to the AES / EBU output terminal 32.

Further, an arbitrary digital audio output signal modulated in the AES / EBU format is supplied to the channel status recognition section and the control section 33. In step S6 of FIG. 6, the channel status recognizing unit and the control unit 33 detect the source ID of the arbitrary output signal by the internal source ID detecting unit, and the destination of the arbitrary output signal by the internal destination ID detecting unit. The ID is detected and stored in the channel status memory. In step S7 of FIG. 6, the channel status recognition unit and control unit 33 determines the source I of the input signal stored in the channel status memory.
A comparator compares D and the destination ID with the source ID and the destination ID of an arbitrary output signal. If they are not the same, steps S5 to S7 are repeated.

When the input signal and the arbitrary output signal have the same source ID and destination ID, the bus assign switch control signal generator generates a bus assign switch control signal for the corresponding bus 11. The bus assign switch control signal generated by the bus assign switch control signal generator is supplied to the control terminal of the bus assign switch 10 of the corresponding bus 11 line. The bus assign switch control signal causes the bus assign switch 10 of the line of the corresponding bus 11 to be turned off in step S8 of FIG.

Therefore, at this time, the input voice signal is not output from the voice monitor output terminal 32 of the voice signal control device 1, and the other input terminal 15 of the voice signal control device 1 from the external switcher 38 shown in FIG. It will not be input into the audio signal control device 1 via the. As a result, there is no automatic occurrence of unexpected howling in a relay program or an internet program.

Further, according to the above example, in the audio signal control device 1, in the above description, the channel status recognizing unit and the control unit 33 as the discriminating means have the signal supply source information and the signal supply destination information in the input audio signal. And the signal supply source information and the signal supply destination information in the arbitrary output audio signal are determined to be the same, and the determining means determines the signal supply source information and the signal supply destination information in the input audio signal and the arbitrary output. When it is determined that the signal supply source information and the signal supply destination information in the audio signal are the same, the transmission of the audio signal through the signal line is cut off. Therefore, the audio signal is originally transmitted via the external switcher 38. Despite being sent to the outside, the audio signal control device from the external switcher 38 via the input terminal due to an operation error in the external switcher 38 or the like. Even if it comes back to, it is possible to automatically send the audio signal, so it is possible to save the labor of the operation, and prevent unexpected howling etc. in the relay program or the Internet program. can do.

In the above example, an example in which the channel status recognition unit and the control unit are configured by the CPU has been shown. However, as the source ID detection unit, byte 6 for detecting the 4-byte portion from byte 6 to byte 9 of the channel status data is used. Byte 9 detection unit, destination ID detection unit that detects 4 bytes from byte 10 to byte 13 Byte 10 detection unit, channel status memory, comparator, bus assignment switch control signal generation unit If you output the match signal of the
A logic device) or a gate array may be used. Further, the mute switch 6 may be composed of a DSP (digital signal processor) or a multiplier.

In the above example, when the source ID and the destination ID are the same, the bus assign switch control signal is used to turn off the bus assign switch. However, mute from the channel status recognition unit and the control unit is performed. The mute switch may be turned off by the switch control signal.

[0069]

The signal control device of the present invention converts the specific signal format having the information indicating the signal supply source and the signal supply destination of the supplied audio signal into the internal format, and the conversion means. A signal line for transmitting the audio signal through a plurality of lines, an inverse conversion means for converting the audio signal transmitted by the signal line from an internal format to a specific signal format, and writing new signal destination information, and a signal supply A discriminator that discriminates whether the source information and the signal destination information are the same, and when the discriminator determines that the signal source information and the signal destination information are the same, the signal line of the audio signal Since the transmission due to is blocked, it is possible to automatically send out the audio signal, which can save the labor of the operation, the relay program, Tsu howling like unexpected in preparative program an effect that eliminates occur.

Further, in the audio signal control device of the present invention, in the above description, the determining means is the signal supply source information and the signal supply destination information in the input audio signal, and the signal supply source information and the signal in the arbitrary output audio signal. It is determined whether or not the supply destination information is the same, and the determination means determines the signal supply source information and the signal supply destination information in the input audio signal and the signal supply source information and the signal supply destination information in the arbitrary output audio signal. When it is determined that they are the same, the transmission of the voice signal through the signal line is cut off. Therefore, although the voice signal is originally sent to the outside through the external switcher,
Even if the external switcher returns to the audio signal control device via the input terminal due to an operation error or the like, the audio signal can be automatically sent, so that the operation can be saved. This makes it possible to prevent unexpected howling from occurring in relay programs and online programs.

Further, in the above-mentioned audio signal control device of the present invention, the specific signal format is the AES / EBU format of the digital audio signal, and the signal supply source information and the signal supply destination information are the channel status signals. Source ID and destination ID, it is possible to determine the signal supply source and the signal supply destination of the input audio signal, and it is possible to automatically send the audio signal, thus saving labor in the operation. Therefore, it is possible to prevent an unexpected howling from occurring in a relay program or an internet program.

Further, in the audio signal control device of the present invention, in the above description, the interruption of the transmission of the audio signal by the signal line is
Since the bus assign switch provided for each of a plurality of signal lines is cut off, it is possible to automatically send an audio signal without adding another switch, thereby saving labor in operation. Therefore, it is possible to prevent an unexpected howling from occurring in a relay program or an internet program.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of an audio signal control device of the present invention.

FIG. 2 is a diagram showing a configuration of an audio signal control system using an embodiment of the audio signal control device of the present invention.

FIG. 3 is a diagram showing an AES / EBU format digital audio signal used in an embodiment of the audio signal control device of the present invention.

FIG. 4 is a diagram showing a channel status block format used in an embodiment of the audio signal control device of the present invention.

FIG. 5 is a flowchart showing the operation of an embodiment of the audio signal control device of the present invention.

FIG. 6 is a flowchart showing the operation of another embodiment of the audio signal control device of the present invention.

[Explanation of symbols]

 1 audio signal control device 2 channel input terminal 3 AES / EBU decoder 4 signal processing unit 5 channel fader 6 mute switch 7 bus assign switch 8 bus assign switch 9 bus assign switch 10 bus assign switch 11 bus 12 master fader 13 AES / EBU encoder 14 AES / EBU output terminal 15 Other input terminal 16 AES / EBU decoder 17 Signal processing section 18 Fader 19 Mute switch 20 Bus assign switch 21 Bus assign switch 22 Bus assign switch 23 Bus assign switch 24 Master fader 25 AES / EBU encoder 26 AES / EBU output terminal 27 Master fader 28 AES / EBU encoder 29 AES / EB Output terminal 30 Master fader 31 AES / EBU encoder 32 AES / EBU output terminal 33 Channel status recognition unit and control unit 34 Microphone 35 A / D converter 36 Amplifier 37 Monitor speaker 38 External switcher 39 Frame 40 Subframe A 41 Subframe B 42 Sync 43 Auxiliary / Audio 44 Audio Data 45 Audio Sample Validity Bit 46 User Bit 47 Audio Channel Status Bit 48 Subframe Parity Bit 49 Source ID 50 Destination ID

Claims (4)

[Claims] 1. A conversion means for converting a specific signal format having information indicating a signal supply source and a signal supply destination of a supplied audio signal into an internal format, and a plurality of lines for converting the audio signal converted by the conversion means. A signal line to be transmitted by the signal line, an inversion means for converting the audio signal transmitted by the signal line from the internal format to the specific signal format, and writing new signal destination information, and the signal source information and The signal supply destination information, and a determination means for determining whether the same, the signal supply source information and the signal supply destination information when the determination means is the same, the audio signal of the An audio signal control device characterized in that transmission through the signal line is cut off. 2. The audio signal control device according to claim 1, wherein the determining means includes signal source information and signal destination information in the input audio signal, and signal source information and signal in an arbitrary output audio signal. It is determined whether or not the supply destination information is the same, and the determination means determines the signal supply source information and the signal supply destination information in the input audio signal, and the signal supply source information in any of the output audio signals, An audio signal control device, characterized in that when it is determined that the signal supply destination information is the same, transmission of the audio signal through the signal line is cut off. 3. The audio signal control device according to claim 1, wherein the specific signal format is an AES / EBU format of a digital audio signal, and the signal supply source information and the signal supply destination information are channel statuses. An audio signal control device characterized by a source ID and a destination ID in a signal. 4. The voice signal control device according to claim 1, wherein transmission of the voice signal by the signal line is interrupted by interrupting a bus assign switch provided in each of the signal lines. An audio signal control device characterized by the above.