WO2019130788A1 - 音量制御装置、音量制御方法、及び音量制御システム - Google Patents

音量制御装置、音量制御方法、及び音量制御システム Download PDF

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Publication number
WO2019130788A1
WO2019130788A1 PCT/JP2018/040053 JP2018040053W WO2019130788A1 WO 2019130788 A1 WO2019130788 A1 WO 2019130788A1 JP 2018040053 W JP2018040053 W JP 2018040053W WO 2019130788 A1 WO2019130788 A1 WO 2019130788A1
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Prior art keywords
broadcast
noise
signal
volume
volume control
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PCT/JP2018/040053
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English (en)
French (fr)
Japanese (ja)
Inventor
徳田　肇道
田中　直也
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パナソニックＩｐマネジメント株式会社
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Publication of WO2019130788A1 publication Critical patent/WO2019130788A1/ja

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0316—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude
    • G10L21/0324—Details of processing therefor
    • G10L21/034—Automatic adjustment
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0316—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude
    • G10L21/0364—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude for improving intelligibility
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/32—Automatic control in amplifiers having semiconductor devices the control being dependent upon ambient noise level or sound level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00—Public address systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones

Definitions

  • the present disclosure relates to a volume control device, a volume control method, and a volume control system that controls the volume of broadcast sound that is broadcasted in an environment where noise is present.
  • Patent Document 1 a signal-to-noise ratio between a broadcast audio signal in a predetermined frequency band and a noise signal collected by a microphone is calculated, and the signal-to-noise ratio is a measure of the signal to noise ratio of broadcast audio.
  • a sound volume control apparatus is disclosed that determines the amplification factor of a broadcast audio signal so as to achieve a target value of the noise ratio. As a result, the volume control device can output the broadcast sound at a volume that does not make it difficult to hear.
  • the signal collected by the microphone of Patent Document 1 includes, in addition to the noise signal existing around the place where the microphone is installed, the broadcast sound actually broadcasted at the place. Even with the configuration of Patent Document 1, it is possible to distinguish the noise signal component from the broadcast audio signal and detect it from the collected audio signal (that is, a signal in which the broadcast audio signal and the noise signal are mixed) Have difficulty.
  • the component of the noise signal can not be detected separately from the broadcast audio signal, when the broadcast audio signal is amplified by simply referring to the magnitude of the signal observed by the microphone, it is mixed with the noise signal and collected. Since the size of the broadcasted sound is also referred to, there has been a problem that amplification of the broadcasted sound is congested and the volume becomes excessive or the volume vibrates and becomes unstable. In other words, as long as it is difficult to distinguish between the noise signal and the broadcast audio signal, it is not possible to calculate the accurate signal level of the broadcast audio, so it is necessary to appropriately control the volume of the broadcast audio in an environment where noise is present. It was difficult.
  • the present disclosure is devised in view of the above-described conventional circumstances, and adaptively controls a broadcast audio signal output from a speaker by distinguishing it from ambient noise and improves the ease of listening to the broadcast audio listener. It is an object of the present invention to provide a volume control device, a volume control method, and a volume control system.
  • the present disclosure is a volume control apparatus connected to an audio output system that amplifies a broadcast audio signal from a broadcast source and outputs the signal from a speaker, and is observed when the volume of the broadcast audio and the broadcast audio signal are output.
  • a memory for storing correlation data indicating a correlation with the noise value of the noise, the volume of the broadcast sound currently being broadcast from the broadcast source, and the signal level of the sound signal currently collected at the observation point.
  • the noise level of the noise corresponding to the volume of the broadcast sound currently being broadcasted on the basis of the correlation data and the acquisition unit, the noise level of the sound signal is used to be included in the signal level of the voice signal
  • Noise amount estimation unit for estimating the noise value of the noise to be generated
  • an amplification factor calculation unit for calculating the amplification factor of the signal of the broadcast audio currently being broadcasted using the noise value of the noise thus estimated
  • the present disclosure relates to a volume control method in a volume control apparatus connected to an audio output system for amplifying a broadcast audio signal from a broadcast source and outputting the signal from a speaker, which includes the volume of the broadcast audio and the broadcast audio.
  • the correlation data indicating the correlation with the noise value of the noise observed at the time of output of the signal is stored in the memory, and the volume of the broadcast audio currently being broadcast from the broadcast source and the audio signal currently collected at the observation point And the noise level of the noise corresponding to the volume of the broadcast audio currently being broadcast based on the correlation data, and using the determined noise value, the signal of the audio signal is obtained.
  • a volume control method of estimating a noise value of noise included in a level, and using the noise value of the estimated noise, to calculate an amplification factor of the signal of the broadcast sound currently being broadcast.
  • the present disclosure is a sound volume control system including a sound volume control device connected to an audio output system that amplifies a broadcast sound signal from a broadcast sound source and outputs the signal from a speaker, wherein the sound volume control device A memory for storing correlation data indicating the correlation between the volume of the sound and the noise value of the noise observed when the signal of the broadcast sound is output, the volume of the broadcast sound currently being broadcast from the broadcast source, and the observation point Based on the correlation data and an acquisition unit for acquiring the signal level of the currently collected audio signal, the noise value of the noise corresponding to the volume of the broadcast audio currently being broadcast is determined, and the determined noise A noise amount estimation unit for estimating a noise value of noise included in the signal level of the voice signal using a value, and the broadcast voice currently being broadcast using the noise value of the estimated noise Comprising a gain calculator for calculating the amplification factor of the signal, and provides a volume control system.
  • the present disclosure it is possible to adaptively control a broadcast audio signal output from a speaker separately from ambient noise, and to improve the ease of listening to the broadcast audio.
  • Block diagram showing an example of the system configuration of the volume control system according to the first embodiment Explanatory drawing which shows an example of correlation with the volume of a broadcast audio
  • Block diagram showing an example of operation procedure of prior measurement processing of correlation between broadcast speech and noise value
  • Block diagram showing an example of operation procedure of control process of volume of broadcast audio
  • Block diagram showing a system configuration example of a sound volume control system according to a modification of the first embodiment
  • Block diagram showing an example of the system configuration of the volume control system according to the second embodiment
  • Block diagram showing a system configuration example of a sound volume control system according to a modification of the second embodiment
  • the volume control system including the volume control device is a guide for goods, services or restaurants at crowded places where many people gather during business hours (for example, a noisy shopping mall where many shoppers gather)
  • An example use case used in a state where an announcement broadcast for notifying a shopper etc. is made will be described as an example.
  • the volume control system controls the volume of the broadcast sound of the announcement broadcast so that the shopper can easily hear the ambient noise at the observation point.
  • the example of a crowded place is not limited to a shopping mall, but a store, a library, an office, a lobby of a general hospital, a station, etc. may be used.
  • FIG. 1 is a block diagram showing an example of the system configuration of the volume control system 100 according to the first embodiment.
  • the volume control system 100 shown in FIG. 1 includes an existing audio output system 90, a volume control device 20, a microphone device 50, and a signal level calculation device 60.
  • the volume control device 20 is connected so as to be able to input / output data or information with the audio output system 90.
  • the audio output system 90 is disposed as an existing audio output system that amplifies an audio signal of an announcement broadcast (an example of a broadcast sound source) and outputs the audio from the speaker 40, for example, in a shopping mall.
  • the audio output system 90 according to the first embodiment is configured to include, for example, a broadcast sound source 10, a variable amplifier 30, and a speaker 40.
  • the broadcast sound source 10, the variable amplifier 30, and the speaker 40 are connected by a transmission cable (that is, wired) suitable for transmission of an audio signal.
  • the broadcast sound source 10 is a sound source of the sound of the announcement broadcast, for example, a signal of the sound issued by the clerk picked up by a hand microphone held by the clerk of the announcement broadcast, a CD (Compact Disk) or a DVD (Digital Versatile Disk) Etc.) corresponds to music data (signal) recorded in advance on a media medium such as.
  • the type of the broadcast sound source 10 is not limited to these signals, and may be, for example, audio of radio broadcast.
  • variable amplifier 30 adaptively amplifies the broadcast audio A signal output from the broadcast sound source 10 according to the variable amplification factor B (see below) set by the volume control device 20.
  • the speaker 40 outputs the audio of the broadcast audio signal amplified by the variable amplifier 30.
  • the volume control device 20 is connected so as to be able to input the broadcast audio A signal from the broadcast sound source 10 so that input or output of data or information can be performed to the existing audio output system 90, and the variable amplifier 30 Is connected to output information of amplification factor B.
  • the volume control device 20 controls the volume of broadcast audio from the broadcast sound source 10 observed at least at a place where the microphone device 50 is arranged (in other words, an observation point).
  • the volume control device 20 is a dedicated device disposed, for example, in a central monitoring room of a shopping center.
  • the volume control device 20 is configured to include a memory 21, a reproduction volume / microphone signal level correlation storage unit 22, a noise amount estimation unit 23, and an amplification factor calculation unit 24.
  • the noise amount estimation unit 23 and the amplification factor calculation unit 24 are, for example, a processor PRC1 configured using a central processing unit (CPU), a micro processing unit (MPU), a digital signal processor (DSP), or a field programmable gate array (FPGA). It is.
  • the memory 21 is configured using, for example, a RAM (Random Access Memory) and a ROM (Read Only Memory), and programs and data necessary for executing the operation of the volume control device 20 and data generated during the operation. Or hold information temporarily.
  • the RAM is, for example, a work memory used when the volume control device 20 operates.
  • the ROM stores and holds, for example, a program and data for controlling the volume control device 20 in advance.
  • the reproduction sound volume / microphone signal level correlation storage unit 22 is configured using, for example, an HDD (Hard Disk Drive) or an SSD (Solid State Drive).
  • the reproduction sound volume / microphone signal level correlation storage unit 22 as an example of the memory stores the volume of the broadcast sound output (reproduced) from the broadcast sound source 10 in a time zone in which the shopping center is not open (that is, a quiet time zone). And the correlation with the microphone signal level (that is, the noise value) collected (observed) at the observation point (that is, the point where the microphone device 50 is disposed) along with the output of the broadcast sound from the broadcast source 10 The correlation data shown (see FIG. 2A) is retained.
  • FIG. 2A is an explanatory view showing an example of the correlation between the volume of broadcast audio and the noise value.
  • the upper part of FIG. 2A is broadcast from the audio output system 90 in a time zone in which the shopping center is not open (in other words, a quiet time zone such as early morning or late night when there is no surrounding noisy environment)
  • a quiet time zone such as early morning or late night when there is no surrounding noisy environment
  • sound volume of the broadcast sound and sound collection (observation) at the observation point that is, the point where the microphone device 50 is arranged
  • Correlation data showing correlation with the microphone signal level (that is, noise value) determined is shown as a graph.
  • the correlation data in the upper part of FIG. 2A shows an example in which the volume of broadcast audio (broadcast volume) and microphone signal level (noise value) are approximated by a linear function (for example, a linear function) to make the explanation easy to understand. It is done.
  • a linear function for example, a linear function
  • the volume of the broadcast audio and the signal of the broadcast audio are output from the speaker 40
  • the data showing the relationship with the microphone signal level “N” (that is, the noise value) collected (observed) at the observation point (that is, the point where the microphone device 50 is arranged) at the time of There is.
  • noise for example, “n0” generated by the surrounding environment that does not depend on the influence of the output of broadcast audio is detected as a comprehensively added signal.
  • the volume control device 20 detects the volume of the broadcast sound from the broadcast sound source 10 separately from the signal level of the noise generated due to the surrounding environment. It becomes possible. Thereby, the volume control device 20 causes the speaker 40 to output a sound of a signal level obtained by adding a predetermined volume (in other words, sound pressure) described later to the signal level of the noise “n0” calculated.
  • the broadcast audio signal can be amplified with respect to ambient noise to improve the listener's ease of hearing the broadcast audio.
  • the noise amount estimation unit 23 as an example of an acquisition unit receives and acquires a signal of broadcast audio currently being broadcasted from the broadcast sound source 10, and analyzes the volume of the broadcast audio A from the acquired signal.
  • the noise amount estimation unit 23 multiplies the volume of the audio signal obtained by multiplying the volume obtained by the analysis by the amplification factor B delivered from the amplification factor calculation unit 24 described later, the volume of the broadcast audio A currently being broadcast. Get as.
  • the noise amount estimation unit 23 acquires the microphone signal level output from the signal level calculation device 60.
  • the microphone signal level is, for example, the microphone signal level “n1” in the upper graph of FIG. 2A or the microphone signal level “N” in the lower graph of FIG. 2A.
  • the noise amount estimation unit 23 determines the noise value of the noise corresponding to the acquired sound volume of the broadcast sound (for example, the graph in the upper part of FIG. 2A).
  • the microphone signal level “n1” in the above is calculated and obtained.
  • the noise value of this sought noise is what the noise level of the shopping center does not operate (in other words, a quiet time zone such as early morning or late night when there is no surrounding noisy environment) If a loud broadcast audio signal is output from the speaker 40, it indicates how much noise is detected at the same observation point.
  • the noise amount estimation unit 23 uses the determined noise value to detect noise included in the microphone signal level “N” output from the signal level calculation device 60 (that is, not depending on the influence of the output of broadcast audio) Estimate the noise value of noise generated by the environment.
  • the noise amount estimation unit 23 outputs the estimation result (noise amount) of the noise value to the amplification factor calculation unit 24.
  • the amplification factor calculation unit 24 uses the estimation result (noise amount) of the noise value output from the noise amount estimation unit 23 to obtain the amplification factor of the signal of the broadcast audio currently being broadcast from the broadcast sound source 10 It is calculated so that the volume of the broadcast audio signal after amplification by the above does not exceed the predetermined upper limit volume (see FIG. 2B).
  • FIG. 2B is an explanatory view showing an example of the relationship between the noise value of the noise signal, the signal level of the noise signal and the broadcast sound, and the predetermined upper limit.
  • M1 represents a predetermined upper limit of sound volume
  • M3 represents a characteristic of time-series change of noise amount estimated by the noise amount estimation unit 23
  • M2 represents noise amount estimated by the noise amount estimation unit 23.
  • the characteristic of the time-series change of the sound volume (sound pressure) of the broadcast audio including noise to which a predetermined sound volume (in other words, sound pressure) is added is shown.
  • the predetermined volume (in other words, sound pressure) is said to be preferably, for example, +8 to 13 dB. In other words, the sound in which the volume (in other words, the sound pressure) of +8 to 13 dB is added to the noise generated due to the surrounding environment improves the ease of listening to the broadcast audio listener.
  • the amplification factor calculation unit 24 determines that the volume of the broadcast audio currently being broadcast is +8 to 13 dB (in other words, the sound pressure) in the estimation result (noise amount) of the noise value output from the noise amount estimation unit 23.
  • the amplification factor B is calculated so as to be the volume obtained by adding.
  • the amplification factor calculation unit 24 sets the amplification factor B, which is the calculation result, to the variable amplifier 30, and outputs information on the amplification factor B to the noise amount estimation unit 23.
  • the microphone device 50 is connected to the signal level calculation device 60 so as to be able to input and output data.
  • a microphone device 50 as an example of a sound collection device is disposed at an observation point, picks up the broadcast sound output from the speaker 40 and outputs the collected sound signal to the signal level calculation device 60 as a microphone signal. Output.
  • the signal level calculation device 60 is connected to the volume control device 20 so as to be able to input and output data.
  • the signal level calculation device 60 inputs and acquires a microphone signal passed from the microphone device 50, and converts the microphone signal into a sound size (for example, equivalent noise level).
  • the equivalent noise level is a parameter indicating how much dB is larger or smaller than the basic sound pressure, and so forth.
  • the signal level calculation device 60 outputs the conversion result to the noise amount estimation unit 23 as a microphone signal level.
  • the microphone device 50 and the signal level calculation device 60 are configured as a noise level meter Z1 as an example of a signal level calculation device that picks up the sound of the observation point and calculates the signal level of the currently picked-up sound signal. May be
  • FIG. 3 is a flow chart showing an example of the operation procedure of the prior measurement processing of the correlation between the broadcast audio and the noise value.
  • broadcast audio is reproduced from the broadcast sound source 10, and the signal of the broadcast audio is amplified by the variable amplifier 30 and output through the speaker 40 (S1).
  • the amplification factor B set in the variable amplifier 30 at this time is, for example, an initial value set for the pre-measurement process.
  • the sound reproduced in step S1 is not limited to the broadcast sound, and may be, for example, a test sound.
  • the volume control device 20 inputs and acquires the broadcast audio signal (data) reproduced in step S1, and analyzes the volume of the broadcast audio from the acquired signal.
  • the volume control device 20 obtains the volume of the audio signal obtained by multiplying the volume obtained by the analysis by the amplification factor B used in step S1 as the volume of the broadcast sound currently being broadcasted (S2).
  • the microphone device 50 is disposed at the observation point, picks up the broadcast voice output as voice from the speaker 40, acquires the picked up voice signal as a microphone signal, and calculates the signal level It outputs to the apparatus 60 (S3).
  • the signal level calculation device 60 inputs and acquires the microphone signal passed from the microphone device 50, and converts the microphone signal into the size of sound (for example, equivalent noise level) (S4).
  • the signal level calculation device 60 outputs the conversion result to the volume control device 20 as a microphone signal level.
  • the volume control device 20 calculates correlation data indicating the correlation between the volume of the broadcast audio acquired in step S2 (reproduction volume) and the microphone signal level acquired in step S4 (S5). A certain correlation data is stored in the reproduction volume / microphone signal level correlation storage unit 22 (S6). After the step S6, when the pre-measurement process of the sound volume control system 100 shown in FIG. 3 is ended (S7, YES), the pre-measurement process of the sound volume control system 100 shown in FIG. 3 is ended.
  • FIG. 4 is a flowchart showing an example of an operation procedure of control processing of the volume of broadcast audio.
  • the broadcast sound A is reproduced from the broadcast sound source 10, the signal of the broadcast sound A is amplified by the variable amplifier 30, and is output through the speaker 40 (S11).
  • the amplification factor B set in the variable amplifier 30 at this time is, for example, an initial value set for control processing.
  • the sound reproduced in step S11 is not limited to the voiced broadcast sound A, and may be silent, for example.
  • the volume control apparatus 20 inputs and acquires the signal (data) of the broadcast audio A reproduced in step S11, and analyzes the volume of the broadcast audio A from the acquired signal.
  • the volume control device 20 obtains the volume of the audio signal obtained by multiplying the volume obtained by the analysis by the amplification factor B used in step S11 as the volume of the broadcast audio A currently being broadcasted.
  • the sound volume control device 20 determines the noise value of the noise corresponding to the volume of the acquired broadcast sound based on the correlation data stored in the reproduction sound volume / microphone signal level correlation storage unit 22 (for example, in the upper graph of FIG. 2A).
  • the microphone signal level "n1" is calculated and obtained (S12).
  • the microphone device 50 is disposed at the observation point, picks up the broadcast voice A outputted as voice from the speaker 40, acquires the picked up voice signal as a microphone signal, and obtains the signal level It outputs to the calculation apparatus 60 (S13).
  • the signal level calculation device 60 inputs and acquires the microphone signal passed from the microphone device 50, and converts the microphone signal into a sound size (for example, equivalent noise level) (S14).
  • the signal level calculation device 60 outputs the conversion result to the volume control device 20 as a microphone signal level.
  • the volume control device 20 uses the noise value (microphone signal level) determined in step S12 to include the noise included in the microphone signal level "N" passed from the signal level calculation device 60 in step S14 (that is, broadcast audio).
  • the noise value of the noise generated by the surrounding environment which does not depend on the influence of the output of S. is estimated (S15).
  • the volume control device 20 adds a volume (in other words, sound pressure) of +8 to 13 dB to the estimation result (noise amount) of the noise value obtained in step S15, and the volume of the broadcast sound currently being broadcasted.
  • the amplification factor B is calculated to be (S16).
  • the sound volume control device 20 determines whether the sound volume obtained by adding the sound volume (in other words, sound pressure) of +8 to 13 dB to the estimation result (noise amount) of the noise value obtained in step S15 determines whether the predetermined sound volume upper limit is exceeded. To do (S17). When the volume control device 20 determines that the volume, which is the addition result, exceeds the predetermined volume upper limit (S17, YES), the broadcast is performed so that the volume, which is the addition result, becomes the predetermined volume upper limit. The amplification factor B of the signal of the broadcast sound A currently broadcasted from the sound source 10 is adjusted and calculated (S18).
  • the amplification factor B that is the calculation result is variable.
  • the amplifier 30 is set.
  • the variable amplifier 30 adaptively amplifies the broadcast audio signal output from the broadcast sound source 10 according to the variable amplification factor B (see below) set by the volume control device 20 (S19).
  • the speaker 40 outputs the audio of the broadcast audio signal amplified by the variable amplifier 30 (S19).
  • the volume control device 20 is connected to the existing audio output system 90 that amplifies the broadcast audio signal from the broadcast sound source 10 and outputs it from the speaker 40.
  • the volume control device 20 stores correlation data indicating the correlation between the volume of the broadcast audio and the noise value of the noise observed at the time of the output of the broadcast audio signal in the reproduction volume / microphone signal level correlation storage unit 22.
  • the volume control device 20 acquires the volume of the broadcast sound currently being broadcasted from the broadcast source and the signal level of the sound signal currently collected at the observation point.
  • the volume control device 20 Based on the correlation data, the volume control device 20 obtains a noise value of noise corresponding to the volume of the broadcast audio currently being broadcast, and uses the determined noise value to determine the noise included in the signal level of the audio signal.
  • the noise level of the broadcast signal is estimated, and the amplification factor of the signal of the broadcast audio currently being broadcast is calculated using the noise level of the estimated noise.
  • logarithmic calculation between sound pressure levels converted into decibels and a linear / non-linear conversion equation set in advance are applied And a method of referring to the conversion table.
  • the volume control device 20 can adaptively control the broadcast audio signal that is reproduced by the broadcast sound source 10, amplified by the variable amplifier 30, and output as sound from the speaker 40 separately from ambient noise. Since the volume control device 20 amplifies the broadcast audio signal with respect to the noise value of the surrounding noise, it is possible to improve the ease of listening to the broadcast audio listener.
  • the volume control device 20 outputs the calculated amplification factor to the variable amplifier 30 provided in the existing audio output system 90 to amplify the broadcast audio signal.
  • the volume control device 20 can easily be connected to the existing audio output system 90 capable of amplifying the broadcast audio signal from the broadcast sound source 10, and the broadcast audio signal that the listener can easily hear is effectively Can be generated.
  • the volume control device 20 calculates the amplification factor such that the volume of the broadcast sound currently being broadcast is the volume obtained by adding a predetermined volume (for example, 8 to 13 dB) to the noise value of the estimated noise. .
  • a predetermined volume for example, 8 to 13 dB
  • the volume control device 20 can obtain the noise generated by the surrounding environment which does not depend on the influence of the output of the broadcast sound, so that the predetermined volume which can be easily heard with respect to the noise (described above It becomes possible to output the sound volume from the speaker 40 as the broadcast sound by adding the volume of the reference), and the output of the broadcast sound to be listened to by the shopper in the shopping center can be effectively supported.
  • the volume control device 20 is connected to a signal level calculation device (for example, a noise level meter Z1) that collects the sound of the observation point and calculates the signal level of the currently collected sound signal.
  • a signal level calculation device for example, a noise level meter Z1
  • the configurations of the microphone device 50 and the signal level calculation device 60 can be replaced with the noise level meter Z1, so that the construction of the volume control system 100 can be simplified.
  • the volume control device 20A has a configuration (specifically, the signal level calculation unit 25) corresponding to the signal level calculation device 60 according to the first embodiment (see FIG. 5).
  • FIG. 5 is a block diagram showing an example of a system configuration of a sound volume control system 100A according to a modification of the first embodiment.
  • the volume control system 100A shown in FIG. 5 includes an existing audio output system 90, a volume control device 20A, and a microphone device 50.
  • the same components as those of the volume control system 100 shown in FIG. 1 are assigned the same reference numerals to simplify or omit the description, and different contents will be described.
  • the sound volume control device 20A is configured to include a memory 21A, a reproduction sound volume / microphone signal level correlation storage unit 22, a noise amount estimation unit 23, an amplification factor calculation unit 24, and a signal level calculation unit 25.
  • the noise amount estimation unit 23, the amplification factor calculation unit 24, and the signal level calculation unit 25 are, for example, a processor PRC2 configured using a CPU, an MPU, a DSP, or an FPGA.
  • the memory 21A is configured using, for example, a RAM and a ROM, and temporarily holds programs and data required to execute the operation of the volume control device 20A, and further, data or information generated during the operation.
  • the RAM is, for example, a work memory used when the volume control device 20A operates.
  • the ROM stores and holds, for example, a program and data for controlling the volume control device 20A in advance.
  • the signal level calculator 25 is connected to the microphone device 50 so as to be able to input and output data.
  • the signal level calculation unit 25 receives and acquires the microphone signal passed from the microphone device 50, and converts the microphone signal into a sound size (for example, equivalent noise level).
  • the signal level calculation unit 25 outputs the conversion result to the noise amount estimation unit 23 as a microphone signal level.
  • the volume control device 20A calculates the signal level of the sound signal currently collected at the observation point.
  • the configuration (for example, processor PRC2) of the signal level calculation device 60 according to the first embodiment can be included in the volume control device 20A, so the configuration of the signal level calculation device 60 can be omitted from the volume control system 100A.
  • the system construction of the volume control system 100A can be simplified as compared with the first embodiment.
  • the volume control device 20B has a configuration (specifically, a preamplifier 26) corresponding to the variable amplifier 30 according to the first embodiment (see FIG. 6).
  • FIG. 6 is a block diagram showing an example of a system configuration of a sound volume control system 100B according to the second embodiment.
  • the volume control system 100B shown in FIG. 6 is configured to include an existing audio output system 90B, a volume control device 20B, a microphone device 50, and a signal level calculation device 60.
  • an existing audio output system 90B a volume control device 20B
  • a microphone device 50 a volume control device 20B
  • a signal level calculation device 60 a signal level calculation device 60.
  • the same components as those of the volume control system 100 shown in FIG. 1 are assigned the same reference numerals to simplify or omit the description, and different contents will be described.
  • the audio output system 90B is disposed as an existing audio output system that amplifies an audio signal of an announcement broadcast (an example of a broadcast sound source) and outputs the audio from the speaker 40, for example, in a shopping mall.
  • the audio output system 90B according to the second embodiment is configured to include, for example, a broadcast sound source 10, a power amplifier 70, and a speaker 40.
  • the broadcast sound source 10, the power amplifier 70, and the speaker 40 are connected by a transmission cable (that is, wired) suitable for transmission of an audio signal.
  • the power amplifier 70 as an example of the fixed amplifier amplifies the broadcast audio signal whose volume has been adjusted by the volume control device 20B, using a preset fixed amplification factor.
  • the volume control device 20 B includes a memory 21, a reproduction volume / microphone signal level correlation storage unit 22, a noise amount estimation unit 23, an amplification factor calculation unit 24, and a preamplifier 26.
  • the preamplifier 26 as an example of the variable amplifier adaptively amplifies the broadcast audio A signal output from the broadcast sound source 10 according to the variable amplification factor B set by the amplification factor calculator 24.
  • the amplified broadcast audio A signal is amplified by the power amplifier 70 that constitutes the audio output system 90B.
  • the sound volume control device 20B uses the amplification factor B calculated by the amplification factor calculation unit 24 to use the preamplifier 26 for the volume of the broadcast audio currently being broadcast.
  • the amplified broadcast audio signal A is amplified and output to the power amplifier 70 provided in the audio output system 90B.
  • the volume control device 20B is a broadcast audio signal reproduced by the broadcast sound source 10, amplified by the two-stage amplifier of the preamplifier 26 and the power amplifier 70, and output from the speaker 40 as audio. It can be controlled adaptively by separating it from ambient noise.
  • the volume control device 20B amplifies the broadcast audio signal by the two-stage amplifier of the preamplifier 26 and the power amplifier 70 with respect to the noise value of the ambient noise, so that the listener of the broadcast audio can be easily heard compared to the first embodiment. Can be further improved.
  • the volume control device 20C has a configuration (specifically, the signal level calculation unit 25) corresponding to the signal level calculation device 60 according to the second embodiment (see FIG. 7).
  • FIG. 7 is a block diagram showing an example of a system configuration of a sound volume control system 100C according to a modification of the second embodiment.
  • the sound volume control system 100C shown in FIG. 7 includes the existing sound output system 90B, the sound volume control device 20C, and the microphone device 50.
  • the same components as those of the volume control system 100A shown in FIG. 5 and the configuration of the volume control system 100B shown in FIG. And explain the different content.
  • the volume control device 20C includes a memory 21C, a reproduction volume / microphone signal level correlation storage unit 22, a noise amount estimation unit 23, an amplification factor calculation unit 24, a signal level calculation unit 25C, and a preamplifier 26. is there.
  • the memory 21C is configured using, for example, a RAM and a ROM, and temporarily holds programs and data necessary for executing the operation of the volume control device 20C, and further, data or information generated during the operation.
  • the RAM is, for example, a work memory used when the volume control device 20C operates.
  • the ROM stores and holds, for example, a program and data for controlling the volume control device 20C in advance.
  • the volume control device 20C calculates the signal level of the audio signal currently collected at the observation point.
  • the configuration for example, processor PRC2
  • the configuration of the signal level calculation device 60 can be included in the volume control device 20C, the configuration of the signal level calculation device 60 can be omitted from the volume control system 100C.
  • the system construction of the volume control system 100C can be simplified as compared with the second embodiment.
  • the present disclosure is a volume control device, a volume control method, and a volume control system that adaptively controls the volume of broadcast audio output from a speaker separately from ambient noise and improves the ease of listening to the broadcast audio listeners. Useful as.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computational Linguistics (AREA)
  • Quality & Reliability (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Control Of Amplification And Gain Control (AREA)
PCT/JP2018/040053 2017-12-27 2018-10-29 音量制御装置、音量制御方法、及び音量制御システム WO2019130788A1 (ja)

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CN113038336A (zh) * 2019-12-25 2021-06-25 雅马哈株式会社 耳机用音量控制方法、耳机用音量控制装置以及耳机
CN116704983A (zh) * 2022-02-28 2023-09-05 比亚迪股份有限公司 汽车广播降噪方法、装置、计算机设备、存储介质及汽车

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KR102421158B1 (ko) * 2020-03-13 2022-07-14 넥스터 주식회사 실시간 음향분석에 의한 소음도에 따른 음성 안내시스템의 스마트 볼륨 조절 시스템
JP7665187B2 (ja) * 2021-04-02 2025-04-21 八幡電気産業株式会社 自動放送音調整装置、自動放送音調整方法、及びプログラム

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