KR101683823B1 - Device for controllng audio output of multi channel - Google Patents

Device for controllng audio output of multi channel Download PDF

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Publication number
KR101683823B1
KR101683823B1 KR1020160019933A KR20160019933A KR101683823B1 KR 101683823 B1 KR101683823 B1 KR 101683823B1 KR 1020160019933 A KR1020160019933 A KR 1020160019933A KR 20160019933 A KR20160019933 A KR 20160019933A KR 101683823 B1 KR101683823 B1 KR 101683823B1
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South Korea
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signal
audio
output
master
slave
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KR1020160019933A
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Korean (ko)
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박상진
조용훈
신동혁
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(주)유비아이사운드
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/301—Automatic calibration of stereophonic sound system, e.g. with test microphone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/008—Systems employing more than two channels, e.g. quadraphonic in which the audio signals are in digital form, i.e. employing more than two discrete digital channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H04R2430/01—Aspects of volume control, not necessarily automatic, in sound systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/01—Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved

Abstract

The present invention relates to an apparatus for controlling an audio output of a multi-channel, which includes: multiple slave device units, each of which includes a slave digital amplifier and a slave comparator and transmits an audio comparison signal by a direct communications method; a master device unit which includes a master digital amp, a master comparator, and a control signal generator; and a power device unit which adjusts a power voltage according to the control signal and supplies the same to each of the slave digital amplifiers.

Description

TECHNICAL FIELD [0001] The present invention relates to an audio output control apparatus for a multi-

An embodiment of the present invention relates to a multi-channel audio output control apparatus for adjusting an output level of an audio system having multiple channels.

A digital amplifier or a digital audio signal processing device is a device for reproducing high-quality sound by converting all the processes until the audio signal is received and output to the speaker, and amplifying and reducing the noise.

When a multichannel audio system is constructed by connecting multiple digital amplifiers or digital audio signal processing devices, output signals of different levels may be generated according to audio input signals. In this case, sound output through each channel It is possible to make the user feel a little uncomfortable when he / she wants to hear sound of the same volume through multiple channels.

Korean Patent Laid-Open Publication No. 10-2007-0059531 'Speaker output level adjusting device of multi-channel system' Japanese Patent Laid-Open Publication No. 2004-72137 'Signal transmission system and audio system'

An embodiment of the present invention provides a multi-channel audio output control apparatus that automatically controls and reduces power consumption so that the volume or power supply voltage of each channel is equalized according to an audio output level in an audio system having multiple channels.

An apparatus for controlling an audio output of a multi-channel according to an exemplary embodiment of the present invention includes: an audio output unit for receiving an audio input signal from an external source and outputting an audio output signal to an external corresponding channel, A slave digital amplifier for internally outputting an audio output level signal including the audio output level signal; And a slave comparator for receiving an audio comparison signal from the outside and an audio output level signal output to the inside through the slave digital amplifier and outputting a larger level signal as the audio comparison signal, A plurality of slave device units for transmitting audio comparison signals in a serial communication manner; A master digital amplifier for receiving an audio input signal from the outside and outputting an audio output signal to an external corresponding channel and outputting an audio output level signal including level information about the audio output signal to the inside; An audio comparison signal output through a slave unit at a last stage of the plurality of slave device units and an audio output level signal output through the master digital amplifier are input to a slave device unit, A master comparator for outputting a signal as a signal; And a control signal generator for outputting a control signal for adjusting the power supply voltage according to the audio master signal. And a power supply unit for adjusting the power supply voltage according to the control signal and supplying the power supply voltage to the slave digital amplifier, respectively.

The plurality of slave device units may further include a slave output buffer for receiving an audio comparison signal output through the slave comparator and outputting the audio comparison signal to a slave device of the next stage; And an audio comparison signal input buffer for receiving the audio comparison signal output from the slave unit of the front end and outputting the audio comparison signal to the slave comparator, wherein the slave output buffer converts the parallel signal into a serial signal, The audio comparison signal input buffer may include a serial-parallel signal converter that receives a serial signal and converts the parallel signal into a parallel signal and outputs the parallel signal.

The master device may further include an audio comparison signal input buffer for receiving an audio comparison signal output through the slave output buffer included in the last slave device and outputting the audio comparison signal to the master comparator, The comparison signal input buffer may include a serial-parallel signal converter that receives a serial signal and converts the parallel signal into a parallel signal.

The multi-channel audio output control apparatus according to another embodiment of the present invention receives an audio input signal from outside and adjusts an audio volume or a power supply voltage according to an audio master signal to output an audio output signal to an external corresponding channel A slave digital amplifier for internally outputting an audio output level signal including level information on an audio output signal; And a slave comparator for receiving an audio comparison signal from the outside and an audio output level signal output to the inside through the slave digital amplifier and outputting a larger level signal as the audio comparison signal, A plurality of slave device units for transmitting audio comparison signals in a serial communication manner; A master digital amplifier for receiving an audio input signal from the outside and outputting an audio output signal to an external corresponding channel and outputting an audio output level signal including level information about the audio output signal to the inside; And an audio output level signal output through the master digital amplifier and an audio comparison signal output through a slave unit at a final stage of the plurality of slave device units, And a master comparator for outputting an audio master signal to the digital amplifier, respectively.

The plurality of slave device units may include an audio comparison signal output buffer for receiving an audio comparison signal output through the slave comparator and outputting the audio comparison signal to a slave device of the next stage; An audio comparison signal input buffer for receiving an audio comparison signal output from the slave device of the previous stage and outputting the audio comparison signal to the slave comparator; And a master signal input buffer for receiving an audio master signal output through the master comparator and outputting the master master signal to the digital amplifier, wherein the audio comparison signal output buffer converts the parallel signal into a serial signal, And a parallel-to-serial converter. The audio comparison signal input buffer and the master signal input buffer may include a serial-parallel signal converter for receiving a serial signal and converting the parallel signal into a parallel signal.

The master device may further include an audio comparison signal input buffer for receiving an audio comparison signal output through the audio comparison signal output buffer included in the last slave device and outputting the audio comparison signal to the master comparator; And a master signal output buffer for receiving an audio master signal output through the master comparator and outputting the audio master signal to the master signal input buffer, wherein the audio comparison signal input buffer receives a serial signal and converts the serial signal into a parallel signal The master signal output buffer may include a parallel-to-serial converter that receives a parallel signal and converts the parallel signal into a serial signal and outputs the serial signal.

The master signal output buffer may include a control signal generator for generating and outputting a control signal including a predetermined synchronization signal to an audio master signal output through the master comparator.

The master signal input buffer may include a synchronization unit for simultaneously outputting the audio master signal to the slave digital amplifier according to a synchronization signal included in the control signal to synchronize the output of the slave digital amplifier.

According to an embodiment of the present invention, it is possible to provide a multi-channel audio output control apparatus which automatically controls the volume and power supply voltage of each channel to be equal to each other according to an audio output level and consumes less power.

1 is a block diagram illustrating a configuration of a multi-channel audio output control apparatus according to an embodiment of the present invention.
2 is a block diagram illustrating the configuration of a first slave input buffer and a first audio comparison signal output buffer according to an embodiment of the present invention.
3 is a block diagram illustrating a configuration of a multi-channel audio output control apparatus according to another embodiment of the present invention.
4 is a block diagram showing the configuration of a first audio comparison signal input buffer, a first audio comparison signal output buffer, a master output buffer, and an Nth master signal input buffer according to another embodiment of the present invention.

The terms used in this specification will be briefly described and the present invention will be described in detail.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Also, in certain cases, there may be a term selected arbitrarily by the applicant, in which case the meaning thereof will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term, not on the name of a simple term, but on the entire contents of the present invention.

When an element is referred to as "including" an element throughout the specification, it is to be understood that the element may include other elements as well, without departing from the spirit or scope of the present invention. Also, the terms "part," " module, "and the like described in the specification mean units for processing at least one function or operation, which may be implemented in hardware or software or a combination of hardware and software .

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

FIG. 1 is a block diagram illustrating a configuration of a multi-channel audio output control apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram of a first audio comparison signal input buffer and a first audio comparison signal FIG. 4 is a block diagram showing each configuration of the output buffer. FIG.

1, an apparatus 100 for controlling multi-channel audio output according to an embodiment of the present invention is an apparatus for adjusting an output level of an audio system having multiple channels, and includes a plurality of slave device units 110A, 110B, a master device unit 120, and a power supply unit 130. [

The plurality of slave device units 110A and 110B may be connected in a daisy chain manner so as to communicate in a serial manner as shown in FIG.

The plurality of slave device units 110A and 110B may include first and second slave device units 110A and 110B, but in the embodiment of the present invention, the slave device unit is limited to two as shown in the drawing But may include a greater number of slave device portions. Hereinafter, for convenience of description, a plurality of slave device units 110A and 110B will be described as one example having two first and second slave device units 110A and 110B.

The first slave device unit 110A may be a device unit of the first stage among the plurality of slave device units 110A and 110B connected in a daisy chain manner.

 The first slave device 110A includes a first slave digital amplifier 111a, a first slave comparator 112a, a first audio comparison signal input buffer 113a and a first audio comparison signal output buffer 114a can do.

The first slave digital amplifier 111a receives an audio input signal Audio_in 1 from the outside and outputs an audio output signal and an audio output level signal according to a power supply voltage supplied through the power supply unit 130 have. At this time, the first slave digital amplifier 111a adjusts the level of the audio output signal according to the power supply voltage to output the first audio external output signal Audio_out 1 (external) to the external corresponding channel Audio_Ch 1 have.

In addition, the first slave digital amplifier 111a may include a first level detector 111a ', and the first level detector 111a' may include a first audio output unit 111a ' It is possible to detect the level of the external output signal Audio_out 1 (external) and output the first audio output level signal Audio_out 1 (internal) to the first slave comparator 112a. Accordingly, the first audio output level signal Audio_out 1 (internal) may include level information of the first audio external output signal Audio_out 1 (external).

The first slave comparator 112a compares the first audio output level signal Audio_out 1 (internal) output through the first level detector 111a 'with the first audio comparison signal input buffer 113a And outputs the audio signal having the higher voltage level to another audio comparison signal (Audio_out 1) (audio_out 1) (internal comparison) And output it as a signal. Since the input terminal of the first audio comparison signal input buffer 113a is electrically connected to the ground terminal, the audio comparison signal input to the first audio comparison signal input buffer 113a becomes a ground signal. Accordingly, the first slave comparator 112a may output a first audio output level signal (Audio_out 1) (internal) having a voltage level higher than that of the ground signal as an audio comparison signal.

As described above, the first audio comparison signal input buffer 113a receives the ground signal as an input buffer of the first stage and is connected to the ground, and outputs the audio comparison signal having the ground level to the first slave comparator 112a. .

The first audio comparison signal input buffer 113a includes a buffer unit 113a_1 for receiving and outputting serial audio comparison signals from the outside as shown in FIG. And a serial-to-parallel converter 113a_2 for receiving and outputting a parallel serial audio comparison signal. As described above, the first audio comparison signal input buffer 113a may be a buffer capable of receiving a serial signal, converting the serial signal into a parallel signal, and outputting the parallel signal. However, since the input signal is a ground signal, the audio comparison signal input buffer included in the subsequent stage does not have a meaning for the serial-to-parallel conversion, and converts the serial signal into a parallel signal for output.

The first audio comparison signal output buffer 114a receives the audio comparison signal output through the first slave comparator 112a and outputs a second audio comparison signal of the slave device unit of the next slave device unit 110B And output it to the signal input buffer 113b.

The first audio comparison signal output buffer 114a includes a buffer unit 114a_1 for receiving and outputting parallel audio comparison signals from the first slave comparator 112a as shown in FIG. And a parallel-to-serial conversion unit 114a_2 for converting the parallel audio comparison signal output from the buffer unit 114a_1 into a serial signal and outputting the converted serial signal. As described above, the first audio comparison signal output buffer 114a receives the audio comparison signal, which is a serial signal outputted from the first slave comparator 112a, and converts it into a parallel signal. The second audio comparison signal input buffer 113b ). Since the audio output level signal, such as the audio comparison signal, is a multi-bit signal, a large number of input / output pins are required if the signal is transferred directly to the next stage device. For this reason, it can be configured to communicate in a serial manner to reduce the number of input / output pins from one unit to another.

The second slave device 110B includes a second slave digital amplifier 111b, a second slave comparator 112b, a second audio comparison signal input buffer 113b and a second audio comparison signal output buffer 114b can do.

The second slave digital amplifier 111b receives an audio input signal Audio_in 2 from the outside and outputs an audio output signal and an audio output level signal according to a power supply voltage supplied through the power supply unit 130 have. At this time, the second slave digital amplifier 111b may adjust the audio output signal according to the power supply voltage and output a second audio external output signal (Audio_out 2) (external) to an external corresponding channel (Audio_Ch 2).

In addition, the second slave digital amplifier 111b may include a second level detector 111b ', and the second level detector 111b' may include a second audio signal output from an external corresponding channel (Audio_Ch 2) It is possible to detect the level of the external output signal Audio_out 2 (external) and output the second audio output level signal Audio_out 2 (internal) to the second slave comparator 112b. Accordingly, the second audio output level signal (Audio_out 2) (internal) may include level information of the second audio external output signal (Audio_out 2) (external).

The second slave comparator 112b compares the second audio output level signal Audio_out 2 output from the second level detector 111b 'with the second audio comparison signal input buffer 113b And outputs the audio signal having the higher voltage level to another audio comparison signal (Audio_out 2) (internal comparison) with the audio signal of the second audio output level signal (Audio_out 2) And output it as a signal.

For example, the second slave comparator 112b may compare the audio comparison signal output from the second audio comparison signal input buffer 113b with the second audio output level signal output through the second level detector 111b ' The second audio output level signal Audio_out 2 (Audio_out 2) output via the second level detector 111b 'can be output when the voltage level is higher than the audio output level Audio_out 2 (internal) The second audio output level signal Audio_out 2 (internal) can be output as another audio comparison signal when the voltage level of the second audio output level signal Audio_out 2 (internal) is larger than that of the audio comparison signal output from the second audio comparison signal input buffer 113b have.

The second audio comparison signal input buffer 113b is constructed in the same manner as the first audio comparison signal input buffer 113a and is connected to the first audio comparison signal output buffer 114a of the first slave unit 110A, Which is a serial signal outputted from the first slave comparator 112b, and outputs the parallel signal to the second slave comparator 112b.

The second audio comparison signal output buffer 114b is configured in the same manner as the first audio comparison signal output buffer 114a and receives a signal output through the second slave comparator 112b, To the audio comparison signal input buffer 123 of the master device unit 120 in this embodiment. However, if the device of the next stage is a slave device, it can be output to another audio comparison signal input buffer.

The second audio comparison signal output buffer 114b may include a parallel-to-serial converter that receives a parallel signal and converts the serial signal into a serial signal. Accordingly, the second audio comparison signal output buffer 114b may convert the serial signal output from the second slave comparator 112b into a parallel signal, and then output the parallel signal to the audio comparison signal input buffer 123. Since the audio output level signal, such as audio comparison signal or audio output signal, is a multi-bit signal, a large number of input / output pins are required if they are transferred directly to the next stage device. For this reason, the apparatus is configured to be able to communicate in a serial manner to reduce the number of input / output pins to one.

As described above, the first and second slave device units 110A and 110B are connected in a daisy chain manner to generate one audio output signal having the largest level among the audio signals in the serial communication, 120).

The master device unit 120 controls the power supply voltages of the digital amplifiers based on the audio output signal having the largest level received from the first and second slave device units 110A and 110B, And serves to control the supply voltage to be supplied in common.

The master device 120 may include a master digital amplifier 121, a master comparator 122, an audio comparison signal input buffer 123, and a control signal generator 124.

The master digital amplifier 121 receives an audio input signal Audio_in N from the outside and outputs an N audio external output signal Audio_out N (external) to an external corresponding channel Audio_Ch N.

In addition, the master digital amplifier 121 may include a master level detector 121 ', and the master level detector 121' may include an N-th audio external output signal (Audio_Ch N) Audio_out N) (external) and outputs the Nth audio output level signal Audio_out N (internal) to the master comparator 122. Therefore, the Nth audio output level signal (Audio_out N) (internal) may include level information of the Nth audio external output signal (Audio_out N) (external).

The master comparator 122 compares the audio output from the slave unit of the last stage of the plurality of slave units, that is, the audio output from the second audio comparison signal output buffer 114b of the second slave unit 110B, (N) audio output level signal (Audio_out N) (internal) output through the master level detector 121 ', respectively, and output a signal of a higher level as an audio master signal through comparison of magnitude . Here, the audio comparison signal, which is a serial signal output through the second audio comparison signal output buffer 114b, is converted into a parallel signal through the audio comparison signal input buffer 123 and then input to the master comparator 122 .

The master comparator 122 compares the audio comparison signal output from the audio comparison signal input buffer 123 with the voltage level of the N audio output level signal Audio_out N (internal) output through the master level detector 121 ' The N audio output level signal (Audio_out N (internal) output from the master level detector 121 'may be outputted as the audio comparison signal input from the master level detector 121' It is possible to output the Nth audio output level signal Audio_out N (internal) as an audio master signal when the voltage level is larger than the audio comparison signal output from the buffer 123. [

The audio comparison signal input buffer 123 is configured in the same manner as the first audio comparison signal input buffer 113a and can receive a serial signal and convert it into a parallel signal and output it. Accordingly, the audio comparison signal input buffer 123 outputs the serial signal output through the second audio comparison signal output buffer 114b of the second slave unit 110B, which is the last unit of the slave unit in the present embodiment, And outputs the result to the master comparator 122.

The control signal generator 124 outputs a control signal for adjusting the level of the amplifier power supply voltage supplied through the power supply unit 130 according to the level of the audio master signal output through the master comparator 122 .

The power supply unit 130 adjusts the level of the amplifier power supply voltage according to the control signal output through the control signal generator 124 and supplies the levels to the first and second slave digital amplifiers 111a and 111b .

Accordingly, the first and second slave digital amplifiers 111a and 111b receive the adjusted power supply voltage in common, and output the processed audio output signal accordingly, so that the first and second slave digital amplifiers 111a and 111b can automatically control the same volume, The power consumption can be reduced.

FIG. 3 is a block diagram illustrating a configuration of a multi-channel audio output control apparatus according to another embodiment of the present invention. FIG. 4 is a block diagram of a first audio comparison signal input buffer according to another embodiment of the present invention, An output buffer, a master signal output buffer, and an Nth master signal input buffer.

Referring to FIG. 3, an apparatus 200 for controlling multi-channel audio output according to another embodiment of the present invention is an apparatus for adjusting an output level of an audio system having multiple channels, and includes a plurality of slave device units 210A, 210B and a master device unit 220, respectively.

The plurality of slave device units 210A and 210B may be connected in a daisy chain manner so as to communicate in a serial manner as shown in FIG.

The plurality of slave device units 210A and 210B may include first and second slave device units 210A and 210B. However, in another embodiment of the present invention, the slave device unit is limited to two But may include a greater number of slave device portions. Hereinafter, for convenience of description, a plurality of slave device units 210A and 210B will be described as an example having two first and second slave device units 210A and 210B.

The first slave device 210A may be the first stage of the plurality of slave devices 210A and 210B connected in a daisy chain manner.

 The first slave device 210A includes a first slave digital amplifier 211a, a first slave comparator 212a, a first audio comparison signal input buffer 213a, a first audio comparison signal output buffer 214a, N master signal input buffer 215a. In another embodiment of the present invention, the digital amplifier 211a may be replaced with a digital amplifier. However, for convenience of explanation, another embodiment of the present invention will be described by taking a digital amplifier as an example.

The first slave digital amplifier 211a receives an audio input signal Audio_in 1 from the outside and adjusts an audio volume or a power supply voltage according to an audio master signal output through the master device unit 220, Can be output. At this time, the first slave digital amplifier 211a can output the first audio external output signal Audio_out 1 (external) according to the adjustment of the audio volume or the power supply voltage to the external corresponding channel Audio_Ch 1.

In addition, the first slave digital amplifier 211a may include a first level detector 211a ', and the first level detector 211a' may include a first audio output unit 211a ' It is possible to detect the level of the external output signal Audio_out 1 (external) and output the first audio output level signal Audio_out 1 (internal) to the first slave comparator 212a. Accordingly, the first audio output level signal Audio_out 1 (internal) may include level information of the first audio external output signal Audio_out 1 (external).

The first slave comparator 212a compares the first audio output level signal Audio_out 1 (internal) output through the first level detector 211a 'with the first audio comparison signal input buffer 213a And outputs the audio signal having the higher voltage level to another audio comparison signal (Audio_out 1) (audio_out 1) (internal comparison) And output it as a signal. Since the input terminal of the first audio comparison signal input buffer 213a is electrically connected to the ground terminal, the audio comparison signal input to the first audio comparison signal input buffer 213a becomes a ground signal. Accordingly, the first slave comparator 212a may output a first audio output level signal (Audio_out 1) (internal) having a voltage level higher than that of the ground signal as an audio comparison signal.

 As described above, the first audio comparison signal input buffer 213a receives the ground signal as an input buffer of the first stage and is connected to the ground, and outputs the audio comparison signal having the ground level to the first slave comparator 212a. . The first audio comparison signal input buffer 213a includes a buffer unit 213a_1 for receiving and outputting a serial audio comparison signal from the outside as shown in FIG. And a serial-to-parallel converter 213a_2 for receiving and outputting a parallel serial audio comparison signal. As described above, the first audio comparison signal input buffer 213a may be a buffer capable of receiving a serial signal and converting it into a parallel signal and outputting the serial signal. However, since the input signal is a ground signal, the slave input buffer included in the subsequent stage has no significance for serial-to-parallel conversion, and can convert and convert a serial signal into a parallel signal for output.

The first audio comparison signal output buffer 214a receives the audio comparison signal output through the first slave comparator 212a and outputs a second audio comparison signal of the slave device unit of the second slave device unit 210B And output it to the signal input buffer 213b.

The first audio comparison signal output buffer 214a includes a buffer 214a_1 for receiving and outputting parallel audio comparison signals from the first slave comparator 212a as shown in FIG. And a parallel-to-serial conversion unit 214a_2 for converting the parallel audio comparison signal output from the buffer unit 214a_1 into a serial signal and outputting the parallel signal. As described above, the first audio comparison signal output buffer 214a converts the audio comparison signal, which is a serial signal outputted from the first slave comparator 212a, into a parallel signal and then outputs the parallel signal to the second audio comparison signal input buffer 213b Can be output. Since the audio output level signal, such as the audio comparison signal, is a multi-bit signal, a large number of input / output pins are required if the signal is transferred directly to the next stage device. For this reason, it can be configured to communicate in a serial manner to reduce the number of input / output pins from one unit to another.

4, the N-th master signal input buffer 215a includes a buffer unit (not shown) for receiving and outputting an audio master signal and a synchronization signal, which are serial signals output from the master device unit 220 A serial-to-parallel converter 215a_2 for converting a serial signal output from the buffer 215a_1 into a parallel signal, a synchronous signal generator 215a_2 for converting a serial signal output from the serial- And a synchronization unit 215a_3 for synchronizing the output of the audio master signal to the first slave digital amplifier 211a according to the audio master signal.

The second slave device 210B includes a second slave digital amplifier 211b, a second slave comparator 212b, a second audio comparison signal input buffer 213b, a second audio comparison signal output buffer 214b, 2 master signal input buffer 215b.

The second slave digital amplifier 211b receives an audio input signal Audio_in 2 from the outside and adjusts an audio volume or a power supply voltage according to an audio master signal output through the master device unit 220, Can be output. At this time, the second slave digital amplifier 211b may output the second audio external output signal Audio_out 2 (external) according to the adjustment of the audio volume or the power supply voltage to the external corresponding channel Audio_Ch 2.

In addition, the second slave digital amplifier 211b may include a second level detector 211b ', and the second level detector 211b' may include a second audio signal output from an external corresponding channel (Audio_Ch 2) It is possible to detect the level of the external output signal Audio_out 2 (external) and output the second audio output level signal Audio_out 2 (internal) to the second slave comparator 212b. Accordingly, the second audio output level signal (Audio_out 2) (internal) may include level information of the second audio external output signal (Audio_out 2) (external).

The second slave comparator 212b compares the second audio output level signal (Audio_out 2) (internal) output through the second level detector 211b 'with the second audio comparison signal input buffer 213b And outputs the audio signal having the higher voltage level to another audio comparison signal (Audio_out 2) (internal comparison) with the audio signal of the second audio output level signal (Audio_out 2) And output it as a signal.

For example, the second slave comparator 212b may compare the audio comparison signal output from the second audio comparison signal input buffer 213b with the second audio output level signal (Audio_out 2) output from the second level detector 211b 'can be output when the voltage level is higher than that of the audio output signal Audio_out 2 The second audio output level signal Audio_out 2 (internal) can be output as another audio comparison signal when the voltage level of the second audio output level signal Audio_out 2 (internal) is higher than that of the audio comparison signal output from the second audio comparison signal input buffer 213b have.

The second audio comparison signal input buffer 213b is constructed in the same manner as the first audio comparison signal input buffer 213a and is output from the first audio comparison signal output buffer 214a of the first slave unit 210A And outputs the parallel signal to the second slave comparator 212b. The second audio comparison signal output buffer 214b receives the signal output from the second slave comparator 212b and outputs the Nth audio comparison signal of the master unit 220 in the next stage unit, And output it to the input buffer 223. However, if the device of the next stage is a slave device, it can output to another slave input buffer.

The second audio comparison signal output buffer 214b is configured in the same manner as the first audio comparison signal output buffer 214a to convert a serial signal output from the second slave comparator 212b into a parallel signal, To the Nth audio comparison signal input buffer 223. Since the audio output level signal, such as audio comparison signal or audio output signal, is a multi-bit signal, a large number of input / output pins are required if they are transferred directly to the next stage device. For this reason, the apparatus is configured to be able to communicate in a serial manner to reduce the number of input / output pins to one.

The second master signal input buffer 215b is configured in the same manner as the Nth master signal input buffer 215a and receives an audio master signal and a synchronization signal which are serial signals output from the master device unit 220, Signal, and can output the audio master signal to the second slave digital amplifier 211b in synchronization with the synchronization signal.

Accordingly, the audio master signal is simultaneously output to the first and second slave digital amplifiers 211a and 211b in accordance with the synchronization signal transmitted together with the audio master signal, so that the first and second slave device units 210A, 210B may be simultaneously adjusted to the same audio level as the master device unit 220 without delay.

As described above, the first and second slave device units 210A and 210B are connected in a daisy chain manner to generate one audio output signal having the greatest level among the internal audio signals while performing serial communication, 220, respectively.

The master device unit 220 may be configured such that each digital amplifier has the same audio volume or power supply voltage according to the audio output signal having the largest level received from the first and second slave device units 210A and 210B, Can be automatically controlled.

The master device unit 220 may include a master digital amplifier 221, a master comparator 222, an Nth audio comparison signal input buffer 223, and a master signal output buffer 224. In addition, the master device unit 220 may further include an Nth master signal input buffer 225.

The master digital amplifier 221 receives an audio input signal Audio_in N from the outside and outputs an N audio external output signal Audio_out N (external) to an external corresponding channel Audio_Ch N.

In addition, the master digital amplifier 221 may include a master level detector 221 ', and the master level detector 221' may include an N-th audio external output signal (Audio_Ch N) Audio_out N) (external) and outputs the Nth audio output level signal (Audio_out N) (internal) to the master comparator 222. Therefore, the Nth audio output level signal (Audio_out N) (internal) may include level information of the Nth audio external output signal (Audio_out N) (external).

The master comparator 222 compares the audio output from the second slave device unit 210B through the second audio comparison signal output buffer 214b in the last slave device unit of the plurality of slave device units, And the Nth audio internal output signal (Audio_out N) (internal) output through the master level detector 221 ', respectively, and output a signal of a larger level as an audio master signal . The audio comparison signal, which is a serial signal output through the second audio comparison signal output buffer 214b, is converted into a parallel signal through the Nth audio comparison signal input buffer 223, Can be input.

The master comparator 222 compares the audio comparison signal output from the Nth audio comparison signal input buffer 223 with the Nth audio output level signal Audio_out N output from the master level detector 221 ' The N audio output level signal (Audio_out N) (internal) output through the master level detector 221 'can be output as the audio master signal, (N) audio output level signal (Audio_out N) (internal) when the voltage level is greater than the audio comparison signal output from the Nth audio comparison signal input buffer 223 as an audio master signal.

The N-th audio comparison signal input buffer 223 is configured in the same manner as the first audio comparison signal input buffer 213a, receives the serial signal, and converts the serial signal into a parallel signal. Accordingly, the N-th audio comparison signal input buffer 223 outputs a serial signal output through the second audio comparison signal output buffer 214b of the second slave device 210B, which is the last stage of the slave device in the present embodiment, And outputs the parallel signal to the master comparator 222.

The master signal output buffer 224 generates a control signal for generating a control signal by adding a predetermined synchronization signal to the audio master signal output through the master comparator 222 as shown in FIG. A parallel-to-serial converter 224b for converting a parallel signal output from the control signal generator 224a into a serial signal and outputting the parallel signal, And a buffer unit 224c for receiving and outputting a control signal. As described above, a sync signal having a short cycle or a short frequency is included between the audio master signals output through the master signal output buffer 224. These output signals are transmitted to the first and second slave device units 210A, 210b of the first and second master signal input buffers 215a, 215b, respectively.

The stop signal includes a stop signal and a stop signal, and the master signal inputted to the Nth master signal input buffer 215a and the second master signal input buffer 215b is supplied to the first Slave digital amplifier 211a and the second slave digital amplifier 211b, and the start signal serves as a control signal for holding the Nth master signal input buffer 215a and the second master signal And can serve as a control signal for allowing the audio master signal input to the input buffer 215b to be input to the first slave digital amplifier 211a and the second slave digital amplifier 211b. Serial converter 224b may directly output the audio master signal converted into the first and second slave device units 210A and 210B if the sync master does not include the sync signal in the audio master signal.

In the above embodiment, the means for receiving the audio input signal from outside and performing predetermined signal processing and adjusting the level according to the power supply voltage or the control signal is a digital amplifier. However, the present invention is not limited to this, The device may also perform the function of the digital amplifier. Therefore, in this embodiment, the digital amplifier may be replaced with a digital audio signal processing apparatus.

As described above, the present invention is not limited to the above-described embodiments, but may be applied to other embodiments of the present invention It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention.

100: Multi-channel audio output control device
110A: first slave device unit
111a: 1st slave digital amplifier
112a: first slave comparator
113a: first audio comparison signal input buffer
114a: first audio comparison signal output buffer
110B: second slave device unit
111b: second slave digital amplifier
112b: second slave comparator
113b: second audio comparison signal input buffer
114b: second audio comparison signal output buffer
120: Master device unit
121: Master Digital Amplifier
122: master comparator
123: Nth audio comparison signal input buffer
124: control signal generator
130: Power supply unit
200: Multichannel Audio Output Control Device
210A: a first slave device unit
211a: First slave digital amplifier
212a: first slave comparator
213a: first audio comparison signal input buffer
214a: first audio comparison signal output buffer
215a: Nth master signal input buffer
210B: second slave device unit
211b: second slave digital amplifier
212b: second slave comparator
213b: second audio comparison signal input buffer
214b: second audio comparison signal output buffer
215b: second master signal input buffer
220: Master device unit
221: Master Digital Amplifier
222: master comparator
223: Nth audio comparison signal input buffer
224: Master signal output buffer
225: Nth master signal input buffer

Claims (8)

A slave digital amplifier for receiving an audio input signal from the outside and outputting an audio output signal to an external corresponding channel and outputting an audio output level signal including level information about the audio output signal to the inside; And a slave comparator that receives an audio comparison signal from the outside and an audio output level signal output to the inside through the slave digital amplifier and outputs a signal of a larger level as an audio comparison signal through comparison of magnitude, A plurality of slave device units for transmitting signals in a serial communication manner;
A master digital amplifier for receiving an audio input signal from the outside and outputting an audio output signal to an external corresponding channel and outputting an audio output level signal including level information about the audio output signal to the inside; An audio comparison signal output through a slave unit at a last stage of the plurality of slave device units and an audio output level signal output through the master digital amplifier are input to a slave device unit, A master comparator for outputting a signal as a signal; And a control signal generator for outputting a control signal for adjusting a power supply voltage according to the audio master signal. And
And a power supply unit for adjusting the power supply voltage according to the control signal and supplying the adjusted power voltage to the slave digital amplifier,
The slave comparator of each slave device, except the slave device of the first stage among the plurality of slave devices, receives the audio comparison signal from the slave device of the previous stage, compares the audio comparison signal with the audio output level signal, As an audio comparison signal to be compared with the audio output level signal in the slave comparator of the next stage slave unit,
Wherein the master device unit detects a signal of the highest level among audio output level signals of the plurality of slave device units and the master device unit as the audio master signal and adjusts the power source voltage of the power source unit according to the audio master signal And outputs a control signal for controlling the multi-channel audio output.
The method according to claim 1,
The plurality of slave device units include:
A slave output buffer for receiving an audio comparison signal output through the slave comparator and outputting the audio comparison signal to a slave device of the next stage; And
Further comprising an audio comparison signal input buffer for receiving an audio comparison signal output from the slave unit of the previous stage and outputting the audio comparison signal to the slave comparator,
Wherein the slave output buffer includes a parallel-to-serial converter that receives a parallel signal and converts the serial signal into a serial signal,
Wherein the audio comparison signal input buffer includes a serial-parallel signal converter for receiving a serial signal and converting the serial signal into a parallel signal and outputting the parallel signal.
3. The method of claim 2,
Wherein the master device further comprises an audio comparison signal input buffer for receiving an audio comparison signal output through the slave output buffer included in the last slave device and outputting the audio comparison signal to the master comparator,
Wherein the audio comparison signal input buffer includes a serial-parallel signal converter for receiving a serial signal and converting the serial signal into a parallel signal and outputting the parallel signal.
A slave digital amplifier for receiving an audio input signal from the outside and outputting an audio output signal to an external corresponding channel and outputting an audio output level signal including level information about the audio output signal; And a slave comparator that receives an audio comparison signal from the outside and an audio output level signal output to the inside through the slave digital amplifier and outputs a signal of a larger level as an audio comparison signal through comparison of magnitude, A plurality of slave device units for transmitting signals in a serial communication manner; And
A master digital amplifier for receiving an audio input signal from the outside and outputting an audio output signal to an external corresponding channel and outputting an audio output level signal including level information about the audio output signal to the inside; And an audio output level signal output through the master digital amplifier and an audio comparison signal output through a slave unit at a final stage of the plurality of slave device units, And a master comparator for outputting the master signal to the digital amplifier as a master signal,
The slave comparator of each slave device, except the slave device of the first stage among the plurality of slave devices, receives the audio comparison signal from the slave device of the previous stage, compares the audio comparison signal with the audio output level signal, As an audio comparison signal to be compared with the audio output level signal in the slave comparator of the next stage slave unit,
Wherein the master device unit detects a signal of the highest level among audio output level signals of the plurality of slave device units and the master device unit as the audio master signal, And controls the audio volume or power supply voltage of the master unit to be adjusted.
5. The method of claim 4,
The plurality of slave device units include:
An audio comparison signal output buffer for receiving an audio comparison signal output through the slave comparator and outputting the audio comparison signal to a slave device of the next stage;
An audio comparison signal input buffer for receiving an audio comparison signal output from the slave device of the previous stage and outputting the audio comparison signal to the slave comparator; And
Further comprising a master signal input buffer for receiving an audio master signal output through the master comparator and outputting the received audio master signal to the digital amplifier,
Wherein the audio comparison signal output buffer includes a parallel-to-serial converter for receiving a parallel signal and converting the serial signal into a serial signal,
Wherein the audio comparison signal input buffer and the master signal input buffer include a serial-parallel signal converter for receiving a serial signal and converting the parallel signal into a parallel signal and outputting the parallel signal.
6. The method of claim 5,
The master device unit,
An audio comparison signal input buffer for receiving an audio comparison signal output through the audio comparison signal output buffer included in the last slave unit and outputting the audio comparison signal to the master comparator; And
Further comprising a master signal output buffer for receiving an audio master signal output through the master comparator and outputting the received audio master signal to the master signal input buffer,
Wherein the audio comparison signal input buffer includes a serial-parallel signal converter for receiving a serial signal and converting the serial signal into a parallel signal,
Wherein the master signal output buffer includes a parallel-to-serial converter for receiving a parallel signal and converting the parallel signal into a serial signal and outputting the serial signal.
The method according to claim 6,
The master signal output buffer includes:
And a control signal generator for generating and outputting a control signal including a predetermined synchronization signal to an audio master signal output through the master comparator.
8. The method of claim 7,
The master signal input buffer includes:
And a synchronization unit for simultaneously outputting the audio master signal to the slave digital amplifier according to a synchronization signal included in the control signal to synchronize the output of the slave digital amplifier.
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CN108989949A (en) * 2018-10-09 2018-12-11 佛山市新东方电子技术工程有限公司 A kind of multichannel interlocking microphony sound pick up equipment
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