JPH118595A - Voice transmission device and method - Google Patents

Abstract

(57) [Summary] An object of the present invention is to provide a power-saving voice transmission device and method, in which a communication standby state is automatically set to a power-down mode, thereby saving power. It is another object of the present invention to provide a voice transmission apparatus and method in which inductive noise or the like in a communication standby state does not enter a transmission / reception signal. A power-down operation switching function unit controls a power-down operation of a signal in a communication standby state, and controls any one of a speech circuit, an A / D & D / A converter unit, and a voice codec unit or a combination thereof. In addition, it aims to save power and prevent amplification of induced noise. Further, in order to prevent noise generated by switching of the power-down mode during communication standby from being added to the transmission / reception signal, the mute operation switching function unit 52 controls the mute operation by the communication circuit 2, A / D &
One or a combination of the D / A converter unit 3 and the audio codec unit 4 is automatically controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice transmission method for communicating and transmitting analog signals such as voice or musical sound, and a method of converting a digital data code signal into a digital data code signal for directly using the method. The present invention relates to an audio transmission device having a built-in audio codec unit.

[0002]

2. Description of the Related Art Heretofore, a voice transmission apparatus has been employed in which power is supplied not only in a communication state but also in a standby state as in a communication state.

[0003]

Conventionally, in a voice transmission apparatus, power is supplied not only in a communication state but also in a standby state in the same manner as in a communication state, so that wasteful power is consumed and it is uneconomical. There was a problem.

[0004] Further, in the communication standby state, since the signal is amplified similarly to the communication state, there is a problem that inductive noise or the like is always generated.

The main objects to be solved by the present invention are as follows. A first object of the present invention is to provide a voice transmission apparatus and method that save power in a communication standby state.

A second object of the present invention is to provide a voice transmission apparatus and method in which noise such as induction noise does not enter a transmission / reception signal in a communication standby state.

[0007] A third object of the present invention is to provide the first and second embodiments.
It is an object of the present invention to provide an automated voice transmission apparatus and method for automatically solving the above object.

Another object of the present invention is to provide a specification, drawings,
In particular, it will be obvious from the description of each claim in the claims.

[0009]

SUMMARY OF THE INVENTION The present invention provides an apparatus and a method for transmitting audio, which employs a power-down mode for reducing or canceling a signal amplification operation and a signal maintenance operation in a communication standby state. It aims to prevent power amplification and amplification of induced noise. Further, in order to prevent noise generated by switching of the power-down mode during communication standby from being added to the transmission / reception signal, a mute operation function of performing a signal mute operation is employed. More specifically, in solving the problem, the present invention achieves the above object by employing each of the novel characteristic configuration methods or means described below.

That is, a first feature of the device of the present invention is that in a voice transmission device for transmitting an analog signal such as voice or musical sound to a communication partner via a digital line, the communication circuit amplifies the signal; It has an audio codec unit for performing encoding and decoding, and a control circuit for them, and the control circuit has a power-down operation switching control unit that controls power-down operation switching of the speech circuit and the audio codec unit. In the configuration of the voice transmission device.

According to a second feature of the device of the present invention, the control circuit according to the first feature of the device of the present invention has a mute operation switching function unit for controlling switching of a mute signal of a speech circuit and a voice codec unit. In the configuration of the voice transmission device.

A third feature of the device of the present invention is that the audio codec unit in the first or second feature of the device of the present invention is:
A digital signal is coded into a digital data code signal and vice versa, and a power down operation and a mute operation can be controlled separately by a control circuit, and a conversion from an analog signal to a digital signal or vice versa. The present invention is to adopt a configuration of a voice transmission device in which an A / D converter or a D / A converter is installed, an analog signal is converted into a digital data code signal, and the reverse conversion is performed.

A fourth feature of the device of the present invention is that the speech codec unit in the first or second feature of the device of the present invention is:
An object of the present invention is to adopt a configuration of a voice transmission device in which an analog signal is directly coded into a digital data code signal and vice versa.

According to a fifth feature of the present invention, the control circuit according to the first, second or third feature of the present invention is characterized in that the control circuit receives the data clock alone or the frame clock in parallel from an external communication line control circuit. Synchronize data communication,
Communication circuit, voice codec, A / D converter and D
The present invention resides in adopting a configuration of a voice transmission device having a timing generation transmitting unit for transmitting a timing signal of an A / A converter.

A sixth feature of the device of the present invention resides in that the control circuit according to the first, second or fourth feature of the device of the present invention is characterized in that the control circuit receives an external data clock alone or a frame clock in parallel and synchronizes a data signal. And a configuration of a voice transmission device having a communication circuit and a timing generation transmission unit for transmitting a timing signal of a voice codec unit.

According to a seventh feature of the device of the present invention, the control circuit according to the first, second, third, fourth, fifth or sixth feature of the device of the present invention corresponds to the presence or absence of a data clock. Another aspect of the present invention resides in the adoption of an audio transmission apparatus which is configured so that the power down on / off operation can be automatically controlled.

An eighth feature of the device of the present invention resides in that the control circuit according to the first, second, third, fourth, fifth, sixth or seventh feature of the device of the present invention determines whether or not a data clock is present. The present invention resides in a configuration of an audio transmission device configured to automatically control a mute on / off operation in accordance with the presence or absence of switching.

A ninth feature of the device of the present invention resides in that the audio codec unit in the first, second, third, fourth, fifth, sixth, seventh or eighth feature of the device of the present invention has a code In decoding or decoding, the present invention resides in adopting a configuration of an audio transmission device configured to be able to compress or decompress each signal.

A tenth feature of the device of the present invention resides in that the control circuit according to the fifth, sixth, seventh, eighth or ninth feature of the device of the present invention comprises a communication circuit, an A / D & D / A converter,
The present invention resides in a configuration of an audio transmission apparatus in which a mute operation and a power-down operation are individually and freely controllable based on a difference in each operation processing speed by each response signal to each control signal to the audio codec unit.

An eleventh feature of the device of the present invention resides in that the control circuit according to the sixth, seventh, eighth or ninth feature of the device of the present invention is characterized in that the control circuit responds to each control signal to the speech circuit and the voice codec section. A mute operation and a power-down operation are individually and freely controllable on the basis of a difference in operation processing speed between signals.

A first feature of the method of the present invention is that, when transmitting a voice signal such as voice or musical sound, the power consumption is reduced by automatically power-down controlling a transmission or reception signal in a communication standby state. In other words, the configuration of the voice transmission method is adopted.

According to a second feature of the method of the present invention, the automatic power down control in the first feature of the method of the present invention is as follows.
An object of the present invention is to adopt a configuration of a voice transmission method in which noise is reduced along with mute control from immediately before down to normal return.

According to a third feature of the method of the present invention, the transmission of the audio signal according to the first or second feature of the method of the present invention is such that the audio signal transmitted by transmitting an analog audio signal to a communication partner through digitization on the way. It consists in adopting the configuration of the transmission method.

A fourth feature of the method of the present invention is that the transmission or reception signal in the first, second or third feature of the method of the present invention is converted into an analog signal, a digital signal and a digital data code signal in this order. Alternatively, the present invention lies in adopting a configuration of a voice transmission method converted in the reverse order.

A fifth feature of the method of the present invention is that the transmitted or received signal in the first, second or third feature of the method of the present invention is converted into an analog signal and a digital data code signal in this order or in reverse order. In the configuration of the voice transmission method converted by the above.

According to a sixth feature of the method of the present invention, the transmission or reception signal in the first, second, third, fourth or fifth feature of the method of the present invention receives a data clock from outside,
A / D in synchronization with the data clock
The present invention resides in adopting a configuration of an audio transmission method which is converted and coded or D / A converted and decoded.

According to a seventh feature of the method of the present invention, the transmission or reception signal in the first, second, third, fourth, fifth or sixth feature of the method of the present invention is such that a data clock and a frame are externally transmitted. The present invention resides in adopting a configuration of an audio transmission method in which a clock is received and A / D conversion and coding or D / A conversion and decoding are performed in synchronization with both clocks.

An eighth feature of the method of the present invention is the A / D conversion or D / A conversion according to the sixth or seventh feature of the method of the present invention.
The conversion consists in adopting the configuration of the voice transmission method that is PCM conversion.

A ninth feature of the method of the present invention is that the method of the present invention is the first, second, third, fourth, fifth, sixth, seventh or eighth.
The transmission or reception signal according to the above feature is characterized in that a power transmission on / off operation is controlled in accordance with the presence or absence of a data clock, thereby adopting a configuration of an audio transmission method.

The tenth feature of the method of the present invention is that the transmission or reception in the first, second, third, fourth, fifth, sixth, seventh, eighth or ninth feature of the method of the present invention is described. The present invention resides in a configuration of an audio transmission method in which a signal is controlled in a mute on / off operation in accordance with the presence or absence of a data clock.

An eleventh feature of the method of the present invention is the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, or tenth feature of the method of the present invention. The coding or decoding of a signal is in the adoption of the configuration of the audio transmission method in which the signal is compressed or decompressed, respectively.

A twelfth feature of the method of the present invention is that the fourth, sixth, seventh, eighth, ninth, tenth or first aspect of the method of the present invention is described.
The mute and power-down control according to the first aspect is characterized in that analog signals, digital signals, digital code signals,
Independently controlling each conversion of the digital decoded signal,
An aspect of the present invention is to adopt a configuration of a voice transmission method in which each response corresponding to each control is individually controlled based on a difference between the conversion processing speeds.

A thirteenth feature of the method of the present invention is that the fifth, sixth, seventh, eighth, ninth, tenth or first aspect of the method of the present invention is described.
The mute and power-down control according to the first aspect controls the conversion of each of the analog signal, the digital code signal, and the digital decode signal separately, and each response corresponding to each control is based on the difference in the conversion processing speed. The present invention resides in adopting a configuration of a voice transmission method controlled individually.

[0034]

Embodiments of the present invention will be described below with reference to the accompanying drawings based on an example of an apparatus and an example of a method.

(Example 1 of Apparatus) FIG. 1 is a block diagram showing the configuration of a first apparatus for implementing the voice transmission method of the present invention.
In the voice transmission device α, the analog input terminal 1 inputs and outputs analog signals such as voice and musical sound, and
Can amplify analog signals such as voices and musical sounds to an appropriate level for communication, and can mute transmission and reception signals and perform power-down operations.

The A / D & D / A converter section 3 performs PCM conversion between an analog signal and a digital signal, and the internal A / D converter 31 and D / A converter 32 respectively perform PCM conversion from an analog signal to a digital signal. Performs PCM conversion from digital signals to analog signals.

The audio codec unit 4 includes an encoding function unit 41 for encoding the digital signal into a digital data code signal by compression or the like, and a decoding unit for decoding the digital data code signal into the digital signal by compression or decompression. And a mute operation of a transmission / reception signal and a power down operation.

The control circuit 5a synchronizes with the clock supplied from the communication line control circuit 9 and
/ D & D / A converter unit 3, audio codec unit 4
A timing generating and transmitting unit 51 for generating and supplying a clock necessary for the operation of the communication circuit 2, the A / D & D / A
The mute operation switching control unit 52 and the power down operation switching control unit 53 for turning on / off the operation of the converter unit 3 and the audio codec unit 4 in a mute state and a power down state, respectively. A /
The D & D / A converter unit 3 is controlled.

The transmission data 61, the reception data 62, the frame clock 63 and the data clock 64 are the data signal and the clock signal of the digital data coded signal between the control circuit 5a and the communication line control circuit 7, respectively. And received data 62 are digital data coded transmission and reception signals, respectively, and a data clock 64 is a clock for timing data communication between the control circuit 5a and the communication line control circuit 7, and a frame clock. Reference numeral 63 denotes a clock for setting the timing of data communication between the control circuit 5a and the communication line control circuit 7 in data frame units, and may not be particularly necessary. The communication line control circuit 7 is a communication line control circuit that manages an interface with the communication line 8.

In the apparatus example 1, the A / D &
Although the D / A converter unit 3 exists, an encoding function unit 41 for directly PCM converting and coding an analog signal into a digital data code signal and a decoding unit for directly decoding and PCM converting a digital data code signal into an analog signal. The A / D & D / A converter unit 3 is not required if the conversion function unit 42 is used. Hereinafter, the same applies to method example 1, apparatus example 2 and method example 2.

(Method Example 1) A voice transmission method according to the device example 1 will be described below. FIG. 2 is a flowchart illustrating an operation procedure of the first example of the method according to the present embodiment. In the communication operation, the analog signal on its own side is
The communication circuit 2, the A / D & D / A converter unit 3, the audio codec unit 4, and the control circuit 5a are passed in this order,
Convert an analog signal to a digital data code signal. The digital data code signal is transmitted to the communication line 8 through the communication line control circuit 7.

The received digital data code signal from the other party's communication line 8 is transmitted to the communication line control circuit 7, the control circuit 5a, the audio codec unit 4
The signal is converted through the / D & D / A converter section 3 and the communication circuit 2 in this order, and the received digital data code signal becomes an analog signal, and takes a communication form output from the analog input / output terminal 1.

The communication line control circuit 7 supplies a data clock 64 and a frame clock 63 to the control device 5a based on a clock received from the communication line 8. In some cases, the frame clock 63 is omitted. The timing generation transmission unit 51 generates and supplies clocks necessary for the operation of the communication circuit 2, the A / D & D / A converter unit 3, and the audio codec unit 4 in synchronization with the supplied clock.

When the mute operation switching control unit 52 switches the mute state to ON, the communication circuit 2 and the A /
D & D / A converter unit 3 and voice codec unit 4
Transmission and reception are muted. When the power down mode is switched on by the power down operation control unit 53, the transmission and reception of the communication circuit 2, the A / D & D / A converter unit 3 and the audio codec unit 4 are set to the power down mode.

That is, depending on whether the mute or power-down operation is on or off (step S21), if it is off, any one of the communication circuit 2, the A / D & D / A converter unit 3, and the audio codec unit 4 or The communication state operation is performed in the combination (step S22). When the communication state is ON, the mute or power down operation is performed in any one of the communication circuit 2, the A / D & D / A converter unit 3, the audio codec unit 4, or a combination thereof. Perform (Step S23).

As described above, the power down mode is turned on / off.
Off can be set, so the communication circuit 2 and the A / D
When any one of the & D / A converter unit 3 and the audio codec unit 4 or a combination thereof is not used, the device unit is switched to the power down mode, and the maintenance cost can be reduced. Also, the power down mode is turned on /
By setting the mute state before switching off, the problem that noise or acoustic shock sound generated at the time of switching on / off of the power down mode is transmitted to the communication partner or the self is solved.

In addition, the communication circuit 2, the A / D & D
Since the A / A converter unit 3 and the audio codec unit 4 can be controlled separately, the control circuit 5b uses the response signal to the control signal of each device to mute / mute in consideration of the difference in the operation processing speed of each device. Power down operation can be controlled individually.

(Embodiment 2) FIG. 3 is a block diagram showing the configuration of a second embodiment of the apparatus for implementing the voice transmission method of the present invention. The configuration of the device example 2 is different from that of the device example 1 in that the control circuit 5b of the audio transmission device β transmits the data clock presence / absence signal to the mute operation switching control unit 52 and the power down operation switching control unit 53. The only difference is that it has a portion 54. The portions having the same functions as those of the device example 1 have the same symbols and names as those of the device example 1.

(Method 2) A voice transmission method according to the apparatus example 2 will be described below. FIG. 4 is a flowchart showing a second method example of the embodiment. The communication form is the first
Since the operation is performed in the same manner as in the embodiment, a portion added to the method example 1 according to the apparatus example 1 will be described below.

The data clock detector 54 detects the presence or absence of a data clock supplied from the communication circuit controller 7 and automatically supplies the communication circuit 2, the A / D & D / A converter 3 and One or a combination of the audio codecs 4 is controlled to enter the power down mode.

As described above, by detecting the data clock supplied from the communication line control circuit 7 when the communication line is connected (step S41), the communication state and the standby state are identified, and the power down is automatically performed in the standby state. Therefore, there is an advantage that it is possible to provide a voice transmission device that saves power and prevents inductive noise.

The presence or absence of a data clock (step S
When the presence / absence of the switching of 42) occurs, the external data clock 64 changes from presence to absence (step S4).
6) Any one or a combination of the communication circuit 2, the A / D & D / A converter unit 3 and the voice codec unit 4 is automatically muted immediately for a certain period of time (steps S44 and S47), which makes the communication partner or oneself uncomfortable. There is an advantage that there is no problem that noise or an acoustic impact sound is generated. When the external data clock 64 changes from none to present (step S43), the communication state operation or the mute operation under the normal power return operation is released after a predetermined time (step S4).
5, S48).

[0053]

As described above, according to the present invention, the communication state and the communication standby state are distinguished by detecting the data clock supplied by the communication line when the communication line is connected. Since it can be down, it is possible to provide a voice transmission device that saves power and prevents amplification of inductive noise.

When the power-down mode is switched due to a change in the presence or absence of the data clock, the mute is automatically muted immediately for a certain period of time. It has an effect that there is no problem that an impact sound is emitted.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an apparatus for implementing a voice transmission method according to an apparatus example 1 of the present invention.

FIG. 2 is a flowchart showing an operation procedure of a method example 1 according to the apparatus example 1 of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a device that implements a voice transmission method according to a device example 2 of the present invention.

FIG. 4 is a flowchart showing an operation procedure of a method example 2 according to the apparatus example 2 of the present invention.

[Explanation of symbols]

 .alpha., .beta. Voice transmission device 1. Analog input terminal 2. Communication circuit 3. A / D & D / A conversion unit 31 A / D converter 32 D / A converter 4. Voice codec 41 Encoding function unit 42 Decoding 5a, 5b: control circuit 51: timing generation transmission unit 52: mute operation switching function unit 53: power down operation switching function unit 54: data clock presence / absence detection unit 61: transmission data 62: reception data 63: frame clock 64 ... data clock 7 ... communication line control function unit 8 ... communication line

Claims (24)

[Claims] An audio transmission apparatus for transmitting an analog signal such as a voice or a musical tone to a communication partner via a digital line to a communication partner. A speech circuit for amplifying a signal, and a voice codec unit for encoding and decoding. And a control circuit therefor, wherein the control circuit includes a power-down operation switching control unit that controls power-down operation switching of the speech circuit and the audio codec unit. 2. The audio transmission device according to claim 1, wherein the control circuit has a mute operation switching function unit that controls mute switching of a signal of the communication circuit and the audio codec unit. 3. A voice codec section encodes a digital signal into a digital data code signal and decodes the digital signal in the opposite manner. A power down operation and a mute operation can be controlled by a control circuit. An A / D converter or a D / A converter for converting a signal to a signal or the inverse of the signal, respectively, and converting an analog signal to a digital data code signal and performing an inverse conversion thereof. 3. The audio transmission device according to 2. 4. The audio transmission apparatus according to claim 1, wherein the audio codec unit directly encodes the analog signal into a digital data code signal and decodes the digital signal in reverse. 5. A control circuit for synchronizing data communication by receiving a data clock alone or in parallel with a frame clock from an external communication line control circuit, and establishing a communication circuit, a voice codec unit, an A / D converter and a D / A converter. The voice transmission device according to claim 1, further comprising a timing generation transmission unit that transmits the timing signal. 6. The control circuit has a timing generation transmission unit for receiving data clocks alone or in parallel with a frame clock from the outside, synchronizing data communication, and transmitting timing signals of a speech circuit and a voice codec unit. The audio transmission device according to claim 1, 2 or 4, wherein: 7. A control circuit according to claim 1, further comprising:
7. The audio transmission device according to claim 1, wherein the off operation is configured to be automatically controllable. 8. The control circuit according to claim 1, wherein the mute on / off operation is automatically controlled in accordance with the presence or absence of the data clock. 4, 5, 6, or 7
An audio transmission device according to claim 1. 9. The audio codec unit according to claim 1, wherein each of the signals is configured to be capable of compressing or decompressing each signal in encoding or decoding. Or the voice transmission device according to 8. 10. A control circuit comprising: a mute operation and a power-down operation based on a difference between respective operation processing speeds in response to respective control signals to a communication circuit, an A / D & D / A converter unit, and a voice codec unit. The sound transmission device according to claim 5, 6, 7, 8, or 9, wherein the sound transmission device is configured to be individually controllable. And a control circuit configured to individually control a mute operation and a power-down operation based on a difference between respective operation processing speeds by each response signal to each control signal to the communication circuit and the voice codec unit. The voice transmission device according to claim 6, 7, 8, or 9, wherein: 12. A voice transmission method for transmitting a voice signal such as a voice or a musical tone, wherein power consumption is reduced by automatically power-down controlling a transmission or reception signal in a communication standby state. . 13. The audio transmission method according to claim 12, wherein the automatic power-down control measures noise reduction with mute control from immediately before the power-down to a normal recovery. 14. The audio transmission method according to claim 12, wherein the transmission of the audio signal is performed by transmitting an analog audio signal to a communication partner through digitization on the way. 15. The transmission signal according to claim 12, 13 or 14, wherein the transmission or reception signal is converted into an analog signal, a digital signal, or a digital data code signal in this order or in the reverse order. Voice transmission method. 16. The voice transmission method according to claim 12, wherein the transmission signal or the reception signal is converted into an analog signal and a digital data code signal in this order or in the reverse order, respectively. . 17. The transmission or reception signal receives a data clock from the outside and performs A / D conversion and coding or D / A conversion and decoding in synchronization with the data clock, respectively. Claim 12, 13, 14, 15, or 1
7. The voice transmission method according to 6. 18. The transmission or reception signal receives a data clock and a frame clock from outside,
17. A / D conversion and encoding or D / A conversion and decoding, respectively, in synchronization with the two clocks.
Or the voice transmission method according to 17. 19. The audio transmission method according to claim 17, wherein the A / D conversion or the D / A conversion is a PCM conversion. 20. A transmission or reception signal is supplied with a power down on / off signal according to the presence or absence of a data clock.
The off operation is controlled, wherein the off operation is controlled.
20. The audio transmission method according to 6, 17, 18 or 19. 21. The transmission or reception signal, wherein a mute on / off operation is controlled in accordance with the presence or absence of the switching of the presence or absence of a data clock.
The voice transmission method according to 6, 17, 18, 19 or 20. 22. The method according to claim 12, wherein the encoding or decoding of the signal is performed by compressing or decompressing the signal, respectively.
The voice transmission method according to 6, 17, 18, 19, 20 or 21. 23. A mute and power-down control, wherein each conversion of an analog signal, a digital signal, a digital code signal, and a digital decode signal is separately controlled, and each of the conversion processing speeds is controlled by each response corresponding to each control. The control is carried out individually based on the difference between:
23. The audio transmission method according to 0, 21 or 22. 24. A mute and power-down control separately controls each conversion of an analog signal, a digital code signal, and a digital decode signal, and responds to each control to determine a difference between the conversion processing speeds. 17. The method according to claim 16, wherein the control is performed individually.
23. The audio transmission method according to 0, 21 or 22.