JP2016163071A - Electronic apparatus and control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the accuracy of sound volume adjustment.SOLUTION: A processor 54 in a radio communication terminal 50 generates a reference signal by reproducing a broadcast signal received by an RF circuit 52. The processor 54 identifies the direction of a broadcast signal reproduction device relative to the radio communication terminal with the use of an acquisition sound signal at a microphone array 51 including target sound and noise reproduced by the broadcast signal reproduction device on the basis of the broadcast signal and the generated reference signal. The processor 54 extracts a signal component of which the arrival direction is deviated away from the identified direction of the broadcast signal reproduction device more than a prescribed level from the acquisition sound signal as a signal component of noise. The processor 54 generates a sound volume control signal for the broadcast signal reproduction device on the basis of the magnitude of the extracted signal component of noise.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electronic device and a control program.

  Conventionally, there has been proposed a remote control device that estimates noise from sound collected by a microphone and adjusts the volume of a television receiver according to the level of the noise. According to this remote control device, the viewer can watch at an optimal volume level without operating the remote control device while paying attention to the external noise level.

JP-A-11-239310

  However, in the conventional remote control apparatus described above, noise is estimated by comparing the sound collected by the microphone with the noise data stored in advance in the memory. For this reason, noise having a pattern different from that of the stored noise data cannot be estimated. As a result, the sound volume adjustment accuracy may be reduced.

  The disclosed technology has been made in view of the above, and an object thereof is to provide an electronic device and a control program capable of improving sound volume adjustment accuracy.

  In an aspect of the disclosure, an electronic device includes a plurality of microphones, a wireless unit, a memory, and a processor connected to the plurality of microphones, the wireless unit, and the memory. The processor generates a reference signal by reproducing a broadcast signal received by the wireless unit. Further, the processor uses the acquired sound signals from the plurality of microphones including the target sound and noise reproduced by the sound source device based on the broadcast signal, and the generated reference signal as a reference. The direction of the sound source device is specified. Further, the processor extracts the noise signal component from the acquired sound signal based on the identified direction of the sound source device and the arrival direction of the signal component included in the acquired sound signal. The processor generates a volume control signal for the sound source device based on the magnitude of the extracted noise signal component.

  According to the disclosed aspect, the volume adjustment accuracy can be improved.

FIG. 1 is a diagram illustrating an example of a volume adjustment system according to the first embodiment. FIG. 2 is a functional block diagram illustrating an example of the broadcast signal reproducing apparatus according to the first embodiment. FIG. 3 is a diagram illustrating a hardware configuration example of the wireless communication terminal according to the first embodiment. FIG. 4 is a functional block diagram illustrating an example of a wireless communication terminal according to the first embodiment. FIG. 5 is a diagram for explaining an arrival direction estimation method. FIG. 6 is a diagram for explaining an arrival direction estimation method. FIG. 7 is a diagram for explaining a method of estimating the arrival direction. FIG. 8 is a flowchart illustrating an example of the processing operation of the wireless communication terminal according to the first embodiment. FIG. 9 is a functional block diagram illustrating an example of a wireless communication terminal according to the second embodiment. FIG. 10 is a flowchart illustrating an example of a processing operation of the wireless communication terminal according to the second embodiment. FIG. 11 is a diagram for explaining the effect of the volume control process of the wireless communication terminal according to the second embodiment.

  Hereinafter, embodiments of an electronic device and a control program disclosed in the present application will be described in detail with reference to the drawings. Note that the electronic device and the control program disclosed in the present application are not limited by this embodiment. Moreover, the same code | symbol is attached | subjected to the structure which has the same function in embodiment, and the overlapping description is abbreviate | omitted. Further, in the embodiment, the same processing steps are denoted by the same reference numerals, and redundant description is omitted.

[Example 1]
[Outline of volume control system]
FIG. 1 is a diagram illustrating an example of a volume adjustment system according to the first embodiment. In FIG. 1, the volume control system 1 includes a radio tower 10, a broadcast signal reproduction device 30, and a wireless communication terminal 50 as an “electronic device”. The radio tower 10 is, for example, Tokyo Skytree (registered trademark), and transmits a broadcast signal. The broadcast signal reproduction device 30 is, for example, a television receiver. The wireless communication terminal 50 is, for example, a smartphone or a mobile phone.

  The broadcast signal reproduction device 30 receives the broadcast signal transmitted from the radio tower 10 and reproduces the broadcast signal by performing demodulation or the like on the received broadcast signal. Then, the broadcast signal reproduction device 30 outputs the reproduced broadcast signal as sound from the speaker of the own device. That is, the broadcast signal reproduction device 30 is a “sound source device”. Hereinafter, the sound output from the broadcast signal reproduction device 30 may be referred to as “target sound”.

  The wireless communication terminal 50 includes a microphone array including a plurality of microphone elements and a wireless unit. The wireless communication terminal 50 generates a “reference signal” by reproducing the broadcast signal received by the wireless unit. In addition, the wireless communication terminal 50 includes a plurality of microphone elements each having a plurality of “frequency ranges” in the acquired sound signal in the microphone array including the target sound and noise output from the broadcast signal reproduction device 30. The "phase difference" between the microphone elements when entering is calculated.

  Then, based on the calculated phase difference, the wireless communication terminal 50 estimates the arrival direction of the signal component in each frequency range based on the own device. And the radio | wireless communication terminal 50 specifies the direction of the broadcast signal reproducing | regenerating apparatus 30 on the basis of an own apparatus from the estimated arrival directions based on the correlation of the frequency spectrum of an acquisition sound signal and the produced | generated reference signal. . Then, the radio communication terminal 50 extracts the signal component in the frequency range corresponding to the arrival direction that is greatly deviated from the specified direction of the broadcast signal reproduction device 30 as a “noise signal component” from the acquired sound signal. . Then, the wireless communication terminal 50 generates a “volume control signal” for the broadcast signal reproduction device 30 based on the magnitude of the extracted noise signal component. That is, a volume control signal that increases the set volume as the noise signal component is larger is generated. Thereby, the viewer who exists near the broadcast signal reproduction apparatus 30 can listen to the target sound without being drowned out by noise even in the noise environment where the viewer is placed.

  Then, the wireless communication terminal 50 transmits the generated volume control signal to the broadcast signal reproduction device 30. Then, the broadcast signal reproduction device 30 adjusts the output sound level based on the received volume control signal. That is, when the set volume indicated by the received volume control signal is different from the currently set volume, the broadcast signal reproduction device 30 adjusts the output sound level according to the set volume indicated by the received volume control signal.

  As described above, the radio communication terminal 50 calculates the “phase difference” between the microphone elements when each signal component having each of a plurality of “frequency ranges” in the acquired sound signal enters the plurality of microphone elements. . Then, based on the calculated phase difference, the wireless communication terminal 50 estimates the arrival direction of the signal component in each frequency range based on the own device. And the radio | wireless communication terminal 50 specifies the direction of the broadcast signal reproducing | regenerating apparatus 30 on the basis of an own apparatus from the estimated arrival directions based on the correlation of the frequency spectrum of an acquisition sound signal and the produced | generated reference signal. . Thereby, since the reference signal to be compared with the target sound is generated from the broadcast signal itself, the direction of the broadcast signal reproduction device 30 that outputs the target sound can be accurately specified. As a result, the direction of noise arrival can also be specified accurately.

  Then, the radio communication terminal 50 extracts a signal component in a frequency range corresponding to the arrival direction that is greatly deviated from the specified direction of the broadcast signal reproduction device 30 as a noise signal component from the acquired sound signal. As a result, it is possible to extract a signal component in the frequency range corresponding to the noise arrival direction that has been accurately identified, that is, the noise signal component.

  Then, the radio communication terminal 50 generates a volume control signal for the broadcast signal reproduction device 30 based on the magnitude of the extracted noise signal component. As a result, the volume can be adjusted according to the magnitude of the noise signal component that can be accurately extracted, so that the volume adjustment accuracy can be improved.

[Configuration example of broadcast signal playback device]
FIG. 2 is a functional block diagram illustrating an example of the broadcast signal reproducing apparatus according to the first embodiment. In FIG. 2, the broadcast signal reproduction device 30 includes a broadcast signal receiving unit 31, a control signal receiving unit 32, a volume control unit 33, an amplification unit 34, and a speaker 35.

  The broadcast signal receiving unit 31 receives the broadcast signal transmitted from the radio tower 10 and reproduces the broadcast signal by performing demodulation or the like on the received broadcast signal. Then, the broadcast signal receiving unit 31 outputs the reproduced broadcast signal to the amplifying unit 34.

  The control signal receiving unit 32 receives the volume control signal transmitted from the wireless communication terminal 50 and outputs the received volume control signal to the volume adjustment unit 33.

  The volume adjusting unit 33 adjusts the gain setting value of the amplifying unit 34 so that the volume corresponds to the volume control signal received from the control signal receiving unit 32.

  The amplifying unit 34 amplifies the broadcast signal reproduced by the broadcast signal receiving unit 31 with the gain setting value adjusted by the volume adjusting unit 33, and outputs the amplified signal to the speaker 35.

  The speaker 35 converts the amplified signal output from the amplification unit 34 into sound and outputs the sound.

[Configuration example of wireless communication terminal]
FIG. 3 is a diagram illustrating a hardware configuration example of the wireless communication terminal according to the first embodiment. In FIG. 3, the wireless communication terminal 50 includes a microphone array 51, an RF (Radio Frequency) circuit 52, an infrared communication circuit 53, a processor 54, and a memory 55.

  The microphone array 51 has at least three or more microphone elements. The microphone array 51 outputs a sound signal (that is, an acquired sound signal) sensed by each microphone element to the processor 54.

  The RF circuit 52 receives the broadcast signal and outputs the received broadcast signal to the processor 54.

  The infrared communication circuit 53 transmits the volume control signal generated by the processor 54 to the broadcast signal reproduction device 30.

  For example, the processor 54 generates a volume control signal based on the acquired sound signal received from the microphone array 51 and the broadcast signal received from the RF circuit 52, and outputs the generated volume control signal to the infrared communication circuit 53. . Various processing functions realized by the processor 54 are realized by recording a program corresponding to each process in the memory 55 and executing each program by the processor 54. Examples of the processor 54 include a CPU, a DSP (Digital Signal Processor), and an FPGA (Field Programmable Gate Array). Further, examples of the memory 55 include a RAM (Random Access Memory) such as SDRAM (Synchronous Dynamic Random Access Memory), a ROM (Read Only Memory), a flash memory, and the like.

  FIG. 4 is a functional block diagram illustrating an example of a wireless communication terminal according to the first embodiment. In FIG. 4, a radio communication terminal 50 includes a microphone array 61, an analog-digital converter (ADC) 62, a broadcast signal receiver 63, frequency separators 64 and 65, a phase difference calculator 66, and an arrival direction estimation. A unit 67, a correlation calculation unit 68, a playback device direction specification unit 69, a noise component extraction unit 70, a volume control unit 71, and a control signal transmission unit 72. Here, the microphone array 61 is realized by the microphone array 51 described above. The broadcast signal receiving unit 63 is realized by the RF circuit 52 and the processor 54 described above. The control signal transmission unit 72 is realized by the infrared communication circuit 53 described above. In addition, the analog-digital conversion unit 62, the frequency separation units 64 and 65, the phase difference calculation unit 66, the arrival direction estimation unit 67, the correlation calculation unit 68, the playback device direction specification unit 69, and the noise component extraction unit 70 The various processing functions realized by the sound volume control unit 71 are realized by recording a program corresponding to each process in the memory 55 and executing each program by the processor 54.

  The microphone array 61 includes microphone elements 81-1 to 81-3. Here, the number of microphone elements 81 is three, but is not limited to this. Hereinafter, the microphone element 81-1 is referred to as a “first microphone element”, the microphone element 81-2 is referred to as a “second microphone element”, and the microphone element 81-3 is referred to as a “third microphone element”. is there.

  The microphone array 61 converts the acquired sound collected by each of the microphone elements 81-1 to 8-1 into an acquired sound signal (electric signal), and outputs the acquired acquired sound signal to the analog / digital converter 62. As described above, the acquired sound signal may include noise in addition to the target sound output from the broadcast signal reproduction device 30.

  The analog / digital conversion unit 62 includes ADC processing units 82-1 to 82-3 corresponding to the microphone elements 81-1 to 81-3, respectively. The ADC processing units 82-1 to 83-1 convert the acquired sound signals collected by the microphone elements 81-1 to 8-3 from analog signals to digital signals, and output the acquired sound signals converted into digital signals to the frequency separation unit 64. To do.

  The frequency separation unit 64 performs fast Fourier transform (FFT) processing on the acquired sound signal, which is a digital signal received from the analog-digital conversion unit 62, to convert the signal in the time domain into a signal in the frequency domain. Then, the frequency separation unit 64 separates the acquired sound signal converted into the frequency domain signal into signal components of a plurality of frequency ranges, and obtains signal components corresponding to the obtained frequency ranges as phase difference calculation units. 66, the correlation calculation unit 68, and the noise component extraction unit 70.

  The phase difference calculation unit 66 calculates the “phase difference” between the microphone elements when each signal component having each of a plurality of frequency ranges in the acquired sound signal in the microphone array 61 enters the microphone elements 81-1 to 81-3. calculate. For example, the phase difference calculation unit 66 uses the microphone element 81 when each signal component having each of a plurality of frequency ranges in the acquired sound signal in the microphone array 61 enters the microphone element 81-1 and the microphone element 81-2. −1 and the microphone element 81-2 are calculated as “first phase difference”. In addition, the phase difference calculation unit 66 uses the microphone element 81 when each signal component having each of a plurality of frequency ranges in the acquired sound signal in the microphone array 61 enters the microphone element 81-1 and the microphone element 81-3. −1 and the microphone element 81-3 are calculated as “second phase difference”.

  The arrival direction estimation unit 67 estimates the arrival direction of the signal component in each frequency range based on the phase difference calculated by the phase difference calculation unit 66 with the wireless communication terminal 50 as a reference.

  5 to 7 are diagrams for explaining an arrival direction estimation method. For example, the wireless communication terminal 50 has a rectangular parallelepiped housing, the microphone element 81-1 is provided on the front surface of the housing, the microphone element 81-2 is provided on the rear surface (back surface) of the housing, and the side surface of the housing. One of them is provided with a microphone element 81-3. Further, when the front direction of the casing is set to the zero degree direction, the angle formed by the normal on the front of the casing and the normal on the side surface of the casing on which the microphone element 81-3 is provided is 90 degrees. The angle formed by the normal on the front of the body and the normal on the rear of the housing is 180 degrees. In addition, an angle between the front direction of the casing and the arrival direction of the target sound is θ1, and an angle between the front direction of the casing and the arrival direction of noise is θ2.

  For example, when a signal component in a certain frequency range is input to the microphone element 81-1 and the microphone element 81-2, the relationship between the arrival direction of the signal component and the “first phase difference” is the relationship shown in FIG. It becomes. For example, when the first phase difference is the phase difference value Δ1, as shown in FIG. 6 and FIG. 7, two directions of θ1 and −θ1 are considered as arrival direction candidates for a signal component in a certain frequency range. From these two direction candidates, the arrival direction θ1 can be selected based on the second phase difference for the signal component in the frequency range. The arrival direction θ2 can be estimated by the same method.

  The broadcast signal receiving unit 63 receives the broadcast signal transmitted from the radio tower 10, and reproduces the broadcast signal by performing demodulation or the like on the received broadcast signal. Then, the broadcast signal receiving unit 63 outputs the reproduced broadcast signal as a “reference signal” to the frequency separation unit 65.

  The frequency separation unit 65 separates the “reference signal” output from the broadcast signal reception unit 63 into the signal components of the plurality of frequency ranges, and calculates the correlation of the signal components corresponding to the obtained frequency ranges. The data is output to the unit 68.

  The correlation calculation unit 68 calculates the correlation of the frequency spectrum between the acquired sound signal and the generated reference signal. That is, for each frequency range described above, a “correlation value” between the signal component of the acquired sound signal and the signal component of the reference signal is calculated.

  The playback device direction identification unit 69 is a broadcast signal based on the radio communication terminal 50 from the arrival directions estimated by the arrival direction estimation unit 67 based on the correlation of the frequency spectrum between the acquired sound signal and the generated reference signal. The direction of the playback device 30 is specified. That is, the playback device direction identification unit 69 selects the frequency range corresponding to the largest correlation value among the correlation values calculated by the correlation calculation unit 68 as the “frequency range of the target sound”, and the frequency range of the selected target sound The arrival direction estimated by the arrival direction estimation unit 67 is specified as the direction of the broadcast signal reproduction device 30.

  The noise component extraction unit 70 is a signal component in a frequency range corresponding to the direction of arrival estimated by the direction-of-arrival estimation unit 67, which is significantly different from the direction of the broadcast signal reproduction device 30 specified by the reproduction device direction specification unit 69. Are extracted as “noise signal components” from the acquired sound signal. The noise component extraction unit 70 outputs the extracted “noise signal component” to the volume control unit 71.

  The volume control unit 71 generates a “volume control signal” for the broadcast signal reproduction device 30 based on the magnitude of the noise signal component extracted by the noise component extraction unit 70. The volume control unit 71 generates a volume control signal that increases the volume as the magnitude of the noise signal component increases. For example, the volume control unit 71 converts the noise signal component extracted by the noise component extraction unit 70 from a frequency domain signal to a time domain signal, and integrates the converted signal in a two-dimensional domain of time and power. Then, the volume control unit 71 generates a “volume control signal” for the broadcast signal reproduction device 30 based on the magnitude of the integration result.

  The control signal transmission unit 72 transmits the volume control signal generated by the volume control unit 71 to the broadcast signal reproduction device 30.

[Example of volume control system operation]
An example of the processing operation of the volume adjustment system having the above configuration will be described. Here, an example of the processing operation of the wireless communication terminal 50 will be mainly described. FIG. 8 is a flowchart illustrating an example of the processing operation of the wireless communication terminal according to the first embodiment. The flowchart shown in FIG. 8 starts when the broadcast signal reproduction device 30 is turned on, for example.

  In the wireless communication terminal 50, the microphone array 61 collects sound with each of the microphone elements 81-1 to 81-3 (step S101).

  The microphone array 61 converts the acquired sound collected by each of the microphone elements 81-1 to 8-3 into an acquired sound signal (electric signal) (step S102). The analog-to-digital conversion unit 62 converts the acquired sound signal collected by the microphone elements 81-1 to 8-3 from an analog signal to a digital signal, and outputs the acquired sound signal converted to the digital signal to the frequency separation unit 64. .

  The broadcast signal receiving unit 63 reproduces a broadcast signal corresponding to the “set channel” among the received broadcast signals (for example, one-segment signal) (step S103). The “set channel” is a channel set as a playback target in the broadcast signal playback device 30.

  The frequency separation unit 64 separates the acquired sound signal into signal components in a plurality of frequency ranges (step S104).

  The phase difference calculation unit 66 calculates the phase difference between the microphone elements when each signal component having each of a plurality of frequency ranges in the acquired sound signal in the microphone array 61 enters the microphone elements 81-1 to 81-3. (Step S105).

  Based on the calculated phase difference, the arrival direction estimation unit 67 estimates the arrival direction of the signal component in each frequency range with reference to the wireless communication terminal 50 (step S106).

  The frequency separation unit 65 separates the reproduced broadcast signal (that is, the reference signal) into signal components in a plurality of frequency ranges (step S107).

  The correlation calculation unit 68 calculates a frequency spectrum correlation in each frequency range between the acquired sound signal separated into signal components in each frequency range and the reference signal separated into signal components in each frequency range (step S108).

  Based on the frequency spectrum correlation calculated by the correlation calculation unit 68, the playback device direction specifying unit 69 uses the broadcast signal playback device 30 based on the radio communication terminal 50 from the arrival directions estimated by the arrival direction estimation unit 67. A direction is specified (step S109).

  The noise component extraction unit 70 is a signal component in a frequency range corresponding to the direction of arrival estimated by the direction-of-arrival estimation unit 67, which is significantly different from the direction of the broadcast signal reproduction device 30 specified by the reproduction device direction specification unit 69. Are extracted from the acquired sound signal as a “noise signal component” (step S110).

  The volume control unit 71 generates a “volume control signal” for the broadcast signal reproduction device 30 based on the magnitude of the noise signal component extracted by the noise component extraction unit 70 (step S111).

  The control signal transmission unit 72 transmits the volume control signal generated by the volume control unit 71 to the broadcast signal reproduction device 30 (step S112).

  As described above, according to the present embodiment, the processor 54 in the wireless communication terminal 50 generates the reference signal by reproducing the broadcast signal received by the RF circuit 52. Then, the processor 54 has each signal component having each of a plurality of frequency ranges in the acquired sound signal in the microphone elements 81-1 to 8 including the target sound and noise reproduced by the broadcast signal reproduction device 30 based on the broadcast signal. Calculates the phase difference between the microphones when enters the microphone elements 81-1 to 81-3. Then, the processor 54 estimates the arrival direction of the signal component in each frequency range with the wireless communication terminal 50 as a reference based on the calculated phase difference. Then, the processor 54 specifies the direction of the sound source device based on the radio communication terminal 50 from the estimated arrival directions based on the correlation between the frequency spectra of the acquired sound signal and the reference signal. Then, the processor 54 extracts a signal component in a frequency range corresponding to the estimated arrival direction, which is largely deviated from the specified direction of the broadcast signal reproduction device 30 from a predetermined level, as a noise signal component from the acquired sound signal. Then, the processor 54 generates a volume control signal for the broadcast signal reproduction device 30 based on the magnitude of the extracted noise signal component.

  With this configuration of the wireless communication terminal 50, the reference signal to be compared with the target sound is generated from the broadcast signal itself, so the direction of the broadcast signal reproduction device 30 that outputs the target sound can be accurately specified. As a result, the direction of noise arrival can also be specified accurately. In addition, it is possible to extract a signal component in a frequency range corresponding to the noise arrival direction that has been accurately identified, that is, a noise signal component. Further, since the volume can be adjusted according to the magnitude of the noise signal component that can be accurately extracted, the volume adjustment accuracy can be improved.

[Example 2]
In the first embodiment, the radio communication terminal 50 generates a volume control signal for the broadcast signal reproduction device 30 based on the magnitude of the extracted noise signal component. On the other hand, in the second embodiment, in the wireless communication terminal 150 described later, based on the ratio of the extracted signal component of the target sound to the extracted noise signal component (that is, the SN ratio), A volume control signal for the broadcast signal reproduction device 30 is generated.

[Configuration example of wireless communication terminal]
FIG. 9 is a functional block diagram illustrating an example of a wireless communication terminal according to the second embodiment. In FIG. 9, the wireless communication terminal 150 includes a target sound component extraction unit 151 and a volume control unit 152. The hardware configuration of the wireless communication terminal 150 is the same as the hardware configuration of the wireless communication terminal 50 of the first embodiment. That is, the various processing functions realized by the target sound component extraction unit 151 and the sound volume control unit 152 are realized by recording a program corresponding to each process in the memory 55 and executing each program by the processor 54. The

  The target sound component extraction unit 151 has a frequency range corresponding to the direction of arrival estimated by the direction-of-arrival estimation unit 67 in which the deviation from the direction of the broadcast signal reproduction device 30 identified by the reproduction device direction identification unit 69 is within a predetermined level. A signal component is extracted from the acquired sound signal as a “signal component of the target sound”. The target sound component extraction unit 151 outputs the extracted “signal component of the target sound” to the volume control unit 152.

  The volume control unit 152 calculates the ratio of the magnitudes of the “noise signal component” extracted by the noise component extraction unit 70 and the signal component of the target sound extracted by the target sound component extraction unit 151 (that is, the SN ratio). A voice control signal is generated based on the calculated ratio. The volume control unit 152 decreases the ratio of the magnitude of the “noise signal component” extracted by the noise component extraction unit 70 and the signal component of the target sound extracted by the target sound component extraction unit 151 (that is, the SN ratio). The volume control signal for increasing the volume is generated. For example, the volume control unit 152 converts the noise signal component extracted by the noise component extraction unit 70 from a frequency domain signal to a time domain signal, integrates the converted signal in a two-dimensional domain of time and power, An integration result of 1 is obtained. The volume control unit 152 converts the signal component of the target sound extracted by the target sound component extraction unit 151 from a frequency domain signal to a time domain signal, and integrates the converted signal in a two-dimensional domain of time and power. The second integration result is obtained. Then, the volume control unit 152 calculates the ratio of the second integration result to the first integration result (that is, the SN ratio), and the “volume” for the broadcast signal reproduction device 30 based on the calculated ratio. Control signal ". The generated volume control signal is transmitted to the broadcast signal reproduction device 30 by the control signal transmission unit 72.

[Operation example of wireless communication terminal]
An example of the processing operation of the wireless communication terminal 150 having the above configuration will be described. FIG. 10 is a flowchart illustrating an example of a processing operation of the wireless communication terminal according to the second embodiment. The flowchart shown in FIG. 10 starts when the broadcast signal reproduction device 30 is turned on, for example.

  The target sound component extraction unit 151 has a frequency range corresponding to the direction of arrival estimated by the direction-of-arrival estimation unit 67 in which the deviation from the direction of the broadcast signal reproduction device 30 identified by the reproduction device direction identification unit 69 is within a predetermined level. A signal component is extracted from the acquired sound signal as a “signal component of the target sound” (step S201).

  The volume control unit 152 calculates the ratio (that is, the SN ratio) between the size of the “noise signal component” extracted by the noise component extraction unit 70 and the size of the signal component of the target sound extracted by the target sound component extraction unit 151. Then, a voice control signal is generated based on the calculated ratio (step S202). The generated audio control signal is transmitted to the broadcast signal reproduction device 30.

  As described above, according to the present embodiment, in the wireless communication terminal 150, the processor 54 has a signal in the frequency range corresponding to the estimated direction of arrival whose deviation from the direction of the specified broadcast signal reproduction device 30 is within a predetermined level. A component is extracted from the acquired sound signal as a signal component of the target sound. Then, the processor 54 generates a volume control signal for the broadcast signal reproduction device 30 based on the ratio of the magnitude of the extracted signal component of the target sound to the magnitude of the extracted noise signal component.

  With the configuration of the wireless communication terminal 150, the volume control signal for the broadcast signal reproduction device 30 is taken into account by taking into account the distance between the broadcast signal reproduction device 30 and the wireless communication terminal 50, that is, the distance between the broadcast signal reproduction device 30 and the viewer. Can be generated. FIG. 11 is a diagram for explaining the effect of the volume control process of the wireless communication terminal according to the second embodiment. That is, as shown in FIG. 11, at a position where the distance between the noise source and the wireless communication terminal 50 is the same (that is, position 1 and position 2 in FIG. 11), the distance between the broadcast signal reproduction device 30 and the wireless communication terminal 50 is Otherwise, the same volume control signal is generated. In this case, at the viewer's position 1 where the distance between the broadcast signal reproduction device 30 and the wireless communication terminal 50 is short, the volume may be excessively increased. On the other hand, by controlling the distance between the broadcast signal reproduction device 30 and the wireless communication terminal 150 as in the volume control process of the wireless communication terminal 150, it is possible to prevent the volume from being excessively controlled. it can.

DESCRIPTION OF SYMBOLS 1 Volume control system 10 Radio tower 30 Broadcast signal reproducing | regenerating apparatus 31 Broadcast signal receiving part 32 Control signal receiving part 33 Volume control part 34 Amplifying part 35 Speaker 50,150 Wireless communication terminal 51,61 Microphone array 52 RF circuit 53 Infrared communication circuit 54 Processor 55 Memory 62 Analog-digital conversion unit 63 Broadcast signal reception unit 64, 65 Frequency separation unit 66 Phase difference calculation unit 67 Arrival direction estimation unit 68 Correlation calculation unit 69 Playback device direction identification unit 70 Noise component extraction unit 71, 152 Volume control unit 72 Control Signal Transmission Unit 81 Microphone Element 82 ADC Processing Unit 151 Target Sound Component Extraction Unit

Claims (4)

Multiple microphones,
A radio unit;
Memory,
A processor connected to the plurality of microphones, the wireless unit, and the memory;
Comprising
The processor is
A reference signal is generated by reproducing a broadcast signal received by the wireless unit,
Direction of the sound source device based on the own device using the acquired sound signals from the plurality of microphones including the target sound and noise reproduced by the sound source device based on the broadcast signal, and the generated reference signal Identify
Based on the direction of the identified sound source device and the arrival direction of the signal component included in the acquired sound signal, the signal component of the noise is extracted from the acquired sound signal,
Generating a volume control signal for the sound source device based on the magnitude of the extracted noise signal component;
An electronic device characterized by that. The processor is
In specifying the direction of the sound source device, a phase difference between microphones when each signal component having each of a plurality of frequency ranges in the acquired sound signal enters the plurality of microphones is calculated, and the calculated phase difference On the basis of the own device, the direction of arrival of the signal component of each frequency range is estimated, and based on the correlation of the frequency spectrum between the acquired sound signal and the generated reference signal, From the inside, specify the direction of the sound source device with reference to its own machine,
In the extraction of the noise signal component, a signal component in a frequency range corresponding to the estimated arrival direction in which the deviation from the direction of the specified sound source device is larger than a predetermined value is used as the noise signal component from the acquired sound signal. Extract,
The electronic device according to claim 1. The processor is
A signal component in a frequency range corresponding to the estimated direction of arrival whose deviation from the direction of the identified sound source device is equal to or less than the predetermined value is further extracted as a signal component of the target sound,
In the generation of the volume control signal, the volume control signal is generated based on a ratio of the magnitude of the extracted noise signal component and the extracted target sound signal component.
The electronic device according to claim 2. Generate a reference signal by playing the broadcast signal received by the radio unit,
Using the acquired sound signals from a plurality of microphones including the target sound and noise reproduced by the sound source device based on the broadcast signal, and the generated reference signal, the direction of the sound source device relative to the own device is determined. Identify,
Based on the direction of the identified sound source device and the arrival direction of the signal component included in the acquired sound signal, the signal component of the noise is extracted from the acquired sound signal,
Generating a volume control signal for the sound source device based on the magnitude of the extracted noise signal component;
A control program for causing an electronic device to execute processing.

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