JP2008211438A - Method and system for sound reproduction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound reproduction system which allows listeners to certainly acquire excellent and enough sense of localization if speakers are placed near listeners and sound is reproduced. <P>SOLUTION: Angles of a left speaker 11L and a right speaker 11R to reference planes 3L and 3R can be changed within a specified range respectively. Angle sensors 15L and 15R detect angles of the left speaker 11L and the right speaker 11R, and a voice-output side transmitter and receiver 30 converts angle detection voltages Vl and Vr to angle detection value data to transmit it to a source side transmitter and receiver 80. The source side transmitter and receiver 80 changes processing parameters corresponding to angles that are indicated by the data to execute sound image localization processing. The processed voice signals are transmitted from the source side transmitter and receiver 80 to the voice-output side transmitter and receiver 30 to supply them to the left speaker 11L and the right speaker 11R. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method and system for reproducing sound by a speaker.

  In the case of reproducing sound with a speaker, the speaker is conventionally installed at a certain distance or more away from the listener. For example, a pair of speakers may be installed at a position near the listener on the side of the listener's head. Conceivable.

  For example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2006-345480), a speaker unit is held in the vicinity of a listener's left and right ears without being attached to a baffle plate so that sounds coming from before and after the diaphragm can be added. It is shown that the input sound signal is subjected to virtual sound source processing and multi-channel surround sound is reproduced by the speaker unit.

  Even if it is not compatible with multi-channel surround, when a listener listens to music on the seat of a vehicle or aircraft, a pair of speakers are placed near the listener on the side of the listener's head to play sound It is possible.

The prior art documents listed above are as follows.
JP 2006-345480 A

  In the case where sound is reproduced by a speaker, as described above, it has been common knowledge that the speaker is installed at a certain distance or more, specifically 1 m or more away from the listener. By installing in the vicinity of the listener, for example, at a distance of about 20 cm from the listener's ear, the listener can experience a sufficient sound pressure and can reduce sound leakage to the surroundings.

  However, when a speaker is installed in the vicinity of a listener in this way, the size, shape, or auditory difference of each listener's head or ears greatly affects the orientation, for example, a certain listener may perform forward localization. The individual listeners vary in the sense of localization, such that they can feel good and well, but another listener can't feel forward localization well and well.

  Therefore, the present invention is designed to ensure that the listener can obtain a good and sufficient orientation when the speaker is installed in the vicinity of the listener and the sound is reproduced.

The sound reproduction method of the present invention is
Detecting the angle of the speaker installed so that the angle with respect to the reference plane can be changed, and changing the processing parameters of the sound image localization processing for the audio signal supplied to the speaker according to the detected angle value. Features.

  In the above sound reproduction method, the listener can change the angle of the speaker. Then, when the listener changes the angle of the speaker, the changed angle is detected in the sound reproduction system, and in accordance with the detected value, the processing parameter of the sound image localization process for the audio signal supplied to the speaker, that is, the sound image localization The filter coefficient of the processing digital filter and the transfer function realized by the digital filter are changed, the sound image localization position felt by the listener is changed, and the sound image localization feeling of the listener is changed.

  Therefore, the listener can adjust the angle of the speaker while listening to the sound to find an angle at which a good and sufficient localization feeling can be obtained, and by listening to the sound at that angle thereafter, good and sufficient A sense of orientation can be obtained with certainty.

  As described above, according to the present invention, when a speaker is installed in the vicinity of a listener to reproduce sound, the listener can surely obtain a good and sufficient sense of localization.

[1. System configuration: FIGS. 1-5]
(1-1. Overall system: Fig. 1)
FIG. 1 shows an example of a sound reproduction system of the present invention.

  In this example, not only audio such as music is reproduced, but also video is reproduced. Specifically, this is a system for reproducing video and audio of a television and a DVD (Digital Versatile Disc).

  The system of this example includes a speaker device 10, an audio output side transceiver 30, a television broadcast receiver 50, a DVD player 60, a display device 70, and a source side transceiver 80.

  The speaker device 10 has a left speaker 11L attached to the arm 12L so that its sound wave emitting surface faces the left ear 2L of the listener 1, and the right speaker 11R is attached to the right ear 2R of the listener 1. It is assumed that they are attached to the arm 12R so as to face each other. Each of the left speaker 11L and the right speaker 11R does not have an enclosure (speaker box).

  One end of the arm 12L is rotatably attached to the fixed portion 14L by the shaft 13L, and the arm 12R is also rotatably attached to the fixed portion 14R by the shaft 13R.

  Furthermore, the fixing unit 14L is provided with an angle sensor 15L as described later for detecting the angle of the arm 12L, that is, the left speaker 11L, with respect to the reference plane 3L, and the fixing unit 14R also includes the arm 12R, that is, the right speaker 11R. An angle sensor 15R as described later for detecting an angle with respect to the reference surface 3R is provided.

  The reference planes 3L and 3R are planes along the front-rear direction when the listener 1 faces the front and views video and audio, respectively, as illustrated.

  As shown in the figure, when the left speaker 11L and the right speaker 11R are parallel to the reference planes 3L and 3R, respectively, the speaker device 10 so that the left speaker 11L and the right speaker 11R face each other at a distance of about 60 cm. Configure.

  The audio output side transceiver 30 supplies audio signals AL and AR to the left speaker 11L and the right speaker 11R, takes in the angle detection voltages Vl and Vr of the outputs of the angle sensors 15L and 15R, and transmits and receives on the source side as will be described later. Signals are sent to and received from the machine 80.

  The television broadcast receiver 50 receives a television broadcast such as a terrestrial digital broadcast and outputs a television video signal and an audio signal. The video output is sent to the display device 70, and the audio output is converted from an electrical signal to an optical signal, for example, and sent to the source-side transceiver 80.

  The DVD player 60 reproduces a video signal and an audio signal from a DVD loaded therein. The video output is sent to the display device 70, and the audio output is converted from an electrical signal to an optical signal, for example, and sent to the source-side transceiver 80.

  The display device 70 is configured by a liquid crystal display panel, an organic EL display panel, or the like.

  The source-side transceiver 80 receives audio signals output from the television broadcast receiver 50 or the DVD player 60, and transmits / receives signals to / from the audio output-side transceiver 30 as will be described later.

(1-2. Angle and angle detection of each speaker: FIGS. 2 to 4)
FIG. 2 shows an angle θl with respect to the reference plane 3L of the left speaker 11L (arm 12L) and an angle θr with respect to the reference plane 3R of the right speaker 11R (arm 12R).

  When viewed from the overhead direction of the listener 1, the angle θl is positive in the counterclockwise direction and negative in the clockwise direction. Conversely, the angle θr is positive in the clockwise direction and negative in the counterclockwise direction.

  The angle θl is changed over a predetermined range, for example, over a range of 90 degrees from +70 degrees to −20 degrees, and the angle θr is also symmetrical, for example, from +70 degrees to −20 degrees. Over a range of 90 degrees, so that it can be changed over a predetermined range.

  The state shown by the solid lines in FIG. 2 for the left speaker 11L and the right speaker 11R is θl = θr = 0 degrees, and the left speaker 11L and the right speaker 11R face each other in parallel at a distance of about 60 cm. 2 is a state where the left speaker 11L and the right speaker 11R are indicated by broken lines in FIG. 2, respectively, and θl = θr = + 30 degrees, and the left speaker 11L and the right speaker 11R are each opened outward by 30 degrees. It is in a state.

  As shown in FIG. 3, each of the angle sensors 15L and 15R can be configured as a variable resistor (volume).

  That is, the angle sensor 15L on the left speaker 11L side extends from one end to the other end of the variable resistor 16L along the periphery of the shaft 13L in FIG. 1, and rotates the arm 12L (left speaker 11L) to change the variable resistor 16L. The DC voltage Vcc is applied between one end and the other end of the variable resistor 16L, and the voltage Vl obtained at the contact 17L is used as the angle detection voltage.

  The angle sensor 15R on the right speaker 11R side also contacts the variable resistor 16R by rotating the arm 12R (right speaker 11R) from one end to the other end of the variable resistor 16R along the periphery of the shaft 13R in FIG. The child 17R is moved, a DC voltage Vcc is applied between one end and the other end of the variable resistor 16R, and the voltage Vr obtained at the contact 17R is used as an angle detection voltage.

  In the angle sensor having such a configuration, the detection voltage changes with respect to the angle, for example, as shown in FIG. However, the angle in the detection characteristic of FIG. 4 is 0 degree, which is an angle at which the detection voltage is 0 V, and the angles θl and θr determined as described above are not 0 degrees.

  Each of the angle sensors 15L and 15R uses a portion having a good detection sensitivity (a large change in detection voltage with respect to a change in angle) as shown in FIG. 4, and the above-described +70 of the angles θl and θr. It is assumed that a change over a range of 90 degrees from -20 degrees to -20 degrees is detected as changes in the voltages Vl and Vr.

  Specifically, in the angle sensor 15L, when the left speaker 11L is in the state indicated by the solid line in FIG. 2 and the angle θl is 0 degree, the voltage Vl becomes the predetermined value V0, and the left speaker 11L is indicated by the broken line in FIG. When the angle θl is positive, the voltage Vl becomes higher than the predetermined value V0 according to the absolute value, and the left speaker 11L is slightly closed inside (listener 1 side). When the angle θl is negative, the voltage Vl is made lower than the predetermined value V0 according to the absolute value, and the same applies to the angle sensor 15R.

(1-3. Source side transceiver and audio output side transceiver: FIG. 5)
FIG. 5 shows an example of the source-side transceiver 80 and the audio output-side transceiver 30.

  The source-side transmitter / receiver 80 has a CPU 81, and a ROM 82 in which various programs executed by the CPU 81 and various data such as processing parameters described later are written and a RAM 83 in which programs and data are expanded are connected to the bus 84. The control unit 85 is configured.

  Furthermore, the light receiving unit 86, the transmission / reception unit 88, the sound processing unit 91, and the memory card interface 98 are connected to the bus 84, and the antenna 89 is connected to the transmission / reception unit 88.

  The light receiving unit 86 receives the audio output transmitted as an optical signal from the television broadcast receiving device 50 or the DVD player 60 as described above, and takes in the bus 84 as a digital audio signal of an electrical signal.

  The audio processing unit 91 performs processing such as sound image localization processing as described later on the captured digital audio signal.

  The transmission / reception unit 88 transmits the digital audio signal processed by the audio processing unit 91 to the audio output-side transceiver 30 and receives angle detection value data transmitted from the audio output-side transmitter / receiver 30 as will be described later. To do.

  In the memory card interface 98, when the left speaker 11L and the right speaker 11R are replaced from the original speaker to another speaker as will be described later, a process for executing audio processing that matches the characteristics of the other speaker. A memory card 99 in which parameters are written is loaded.

  The audio output-side transceiver 30 includes a CPU 31, and a ROM 32 in which various programs executed by the CPU 31 and various data are written and a RAM 33 in which the programs and data are expanded are connected to a bus 34. Is configured.

  Further, an input interface 36, an output interface 37, a transmission / reception unit 38, and an audio processing unit 41 are connected to the bus 34, and an antenna 39 is connected to the transmission / reception unit 38.

  The input interface 36 takes in the angle detection voltages Vl and Vr output from the angle sensors 15L and 15R and converts them into angle detection value data, respectively.

  The audio processing unit 41 performs necessary processing on the digital audio signal transmitted from the source-side transceiver 80 and received by the transmission / reception unit 38.

  The output interface 37 converts the digital audio signal processed by the audio processing unit 41 into an analog audio signal, amplifies the converted analog audio signal, and outputs the left speaker 11L and the audio signals AL and AR as the audio signals AL and AR. This is supplied to the right speaker 11R.

  The transmission / reception unit 38 receives the digital audio signal transmitted from the source-side transceiver 80 and transmits the angle detection value data obtained by the input interface 36 to the source-side transceiver 80 as described above.

[2. Sound image localization processing according to speaker angle: FIGS. 6 to 10]
The sound image localization process in the source-side transceiver 80 is executed as shown in FIG. 6 when the audio signal input to the source-side transceiver 80 is a two-channel stereo audio signal, for example.

  The audio processing unit 91 of the source-side transceiver 80 includes a pre-processing unit 92 and a post-processing unit 95.

  In the pre-stage processing unit 92, the left channel input digital audio signal Lin is supplied to the digital filters 93a and 93b, and the right channel input digital audio signal Rin is supplied to the digital filters 93c and 93d.

  Each of the digital filters 93a and 93c converts, as an input digital audio signal, an impulse response obtained by converting a transfer function on the time axis to localize the sound image of the left channel at a position 5L on the front left side of the listener 1 as shown in FIG. For this purpose, filter coefficients KLL and KRL are set in the digital filters 93a and 93c, respectively.

  Similarly, the digital filters 93b and 93d respectively convert the impulse response obtained by converting the transfer function for localizing the right channel sound image at the front right position 5R of the listener 1 as shown in FIG. For this purpose, filter coefficients KLR and KRR are set in the digital filters 93b and 93d, respectively.

  The output signals of the digital filters 93a and 93c are added by the adder circuit 94L, and the output signals of the digital filters 93b and 93d are added by the adder circuit 94R.

  The digital audio signals Lout1 and Rout1 output from the addition circuits 94L and 94R are supplied to the post-processing unit 95.

  In the post-processing unit 95, the digital audio signal Lout1 is supplied to the digital filters 96a and 96b, and the digital audio signal Rout1 is supplied to the digital filters 96c and 96d.

  In the digital filters 96a and 96b, reciprocal numbers of transfer functions from the left speaker 11L to the left ear 2L and the right ear 2R of the listener 1 are set as filter coefficients Kll and Klr, respectively. In the digital filters 96c and 96d, Reciprocal numbers of transfer functions from the right speaker 11R to the left ear 2L and the right ear 2R of the listener 1 are set as filter coefficients Krl and krr, respectively.

  The output signals of the digital filters 96a and 96c are added by the adder circuit 97L, and the output signals of the digital filters 96b and 96d are added by the adder circuit 97R.

  Then, the digital audio signals Lout2 and Rout2 output from the adders 97L and 97R are transmitted / received from the transmitter / receiver 88 of the source-side transceiver 80 as the output of the post-processing unit 95, that is, the output of the audio processor 91. And is received by the transmitter / receiver 38 of the audio output side transmitter / receiver 30.

  In the audio output side transceiver 30, the received digital audio signals Lout2 and Rout2 are converted into analog audio signals by the output interface 37, respectively, and the converted analog audio signals are respectively amplified, and the above-mentioned analog audio signals are amplified. Audio signals AL and AR are supplied to the left speaker 11L and the right speaker 11R.

  The transfer functions from the positions 5L and 5R in FIG. 7 to the left ear 2L and the right ear 2R of the listener 1 are hardly affected by the angle θl of the left speaker 11L and the angle θr of the right speaker 11R, but the left speaker 11L. The reciprocal of the transfer function from the right speaker 11R to the left ear 2L and the right ear 2R of the listener 1 varies depending on the angle θl of the left speaker 11L and the angle θr of the right speaker 11R.

  Therefore, the filter coefficients for the angles θl and θr are written in the ROM 82 of the source-side transceiver 80 as the filter coefficients Kll, Klr, Krl, and Krr as shown in FIG.

  That is, as the filter coefficients Kll and Klr, filter coefficients for each angle θl of the left speaker 11L shown in FIG. 2 are prepared, and the filter coefficients Krl and Krr are also set for each angle θr of the right speaker 11R shown in FIG. Prepare filter coefficients.

  However, instead of preparing filter coefficients in increments of 1 degree as shown in FIG. 8, for example, filter coefficients are prepared in increments of 5 degrees, and when the angle θl is 7 degrees, the angle θl is You may make it calculate by an interpolation calculation from the filter coefficient in case of 5 degree | times and the filter coefficient in case angle (theta) l is 10 degree | times.

  The CPU 81 of the source-side transceiver 80 detects the angle θl, θr at that time from the angle detection value data transmitted from the audio output-side transceiver 30 as described above, and the filter coefficient corresponding to the angles θl, θr. Are read from the ROM 82 and set in the digital filters 96a, 96b, 96c, 96d of the post-processing unit 95 as filter coefficients Kll, Klr, Krl, Krr.

  Accordingly, the filter coefficients Kll, Klr, Krl, and Krr are changed according to the angles θl and θr at the time, and the transfer functions realized by the digital filters 96a, 96b, 96c, and 96d are changed. The sound image localization position felt by the user or the sound image localization feeling of the listener 1 can be changed.

  Therefore, the listener 1 can find the angle at which good and sufficient localization feeling can be obtained by adjusting the angles θl and θr while listening to the voice, and by listening to the voice at that angle, A sufficient sense of localization can be obtained with certainty.

  FIG. 9 shows a case where a good and sufficient sense of localization is obtained when θl is +50 degrees and θr is +30 degrees as a result of adjusting the angles θl and θr in this way.

  The above is a case where a two-channel stereo audio signal is localized. However, when a monaural audio signal is localized at the front center position, a 5.1 channel surround audio signal such as an audio output of the DVD player 60 is assigned to each channel. The same applies to the case of localization at a corresponding position.

  Specifically, in the system of the above example, the ROM 82 of the source-side transceiver 80 is omitted in FIG. 8, but in addition to the filter coefficient for the 2-channel stereo audio signal, the filter coefficient for the monaural audio signal, and The filter coefficient for the 5.1 channel surround sound signal is written, and the sound processing unit 91 of the source-side transceiver 80 operates as a DSP (Digital Signal Processor) so that the sound signal received by the light receiving unit 86 is a monaural sound signal. The configuration of the sound image localization process is changed depending on whether the sound signal is a 2-channel stereo sound signal or a 5.1-channel surround sound signal.

  FIG. 10 shows an example of the above processing executed by the control unit 85 of the source-side transceiver 80.

  The control unit 85 of the source-side transceiver 80 starts a series of processing when the system is turned on. First, in step 111, processing parameters when the angles θl and θr are both 0 degrees are set as follows. It is set in the voice processing unit 91 as an initial value processing parameter.

  Next, in step 112, the control unit 85 of the source-side transceiver 80 reads the angle detection value data transmitted from the audio output-side transmitter / receiver 30, and then in step 113, from the angle detection value data, the angle at that time is read. It is determined whether both θl and θr are 0 degrees.

  When both the angles θl and θr at that time are 0 degrees, the process proceeds from step 113 to step 115 as it is, and the sound processing including the sound image localization process is performed by the sound processing unit 91 according to the processing parameters of the above initial values. The audio signal is transmitted to the audio output side transceiver 30 and the audio is output from the left speaker 11L and the right speaker 11R.

  On the other hand, when at least one of the angles θl and θr at that time is not 0 degree, the process proceeds from step 113 to step 114, and processing parameters corresponding to the angles θl and θr at that time are set in the voice processing unit 91. Proceeding to 115, the audio signal subjected to the audio processing including the sound image localization processing according to the processing parameters set in step 114 in the audio processing unit 91 is transmitted to the audio output-side transceiver 30, and is transmitted from the left speaker 11 L and the right speaker 11 R Output audio.

  When the transmission of the audio signal is started in step 115, the control unit 85 of the source-side transceiver 80 proceeds to step 116, determines whether or not to end the series of processes, and the listener 1 turns off the system power. When the series of processing ends, for example, the processing ends. Otherwise, the processing ends. If not, the processing proceeds to step 117 and starts transmitting the audio signal in step 115, and then a predetermined time of about 2 to 3 seconds. It is determined whether or not.

  When the predetermined time has not elapsed, the process returns from step 117 to step 116 to determine whether or not to end the series of processes. On the other hand, when the predetermined time has elapsed, the process proceeds from step 117 to step 112. (Return), the detected angle value data transmitted from the audio output side transceiver 30 is read, and the processing from step 113 onward is repeated.

  In addition, for example, there are individual differences in preferences for sound quality, and a user may want to use another speaker because the user does not like the sound quality of the speaker. Further, when the speaker device 10 including the left speaker 11L and the right speaker 11R is installed on an aircraft seat or the like for passengers, a system installer such as an airline has different characteristics between the left speaker 11L and the right speaker 11R. A case of replacing with another speaker is also conceivable.

  These cases are dealt with by the memory card 99 in the system of the example of FIG. 1 as shown in FIG. In the memory card 99, all the reverse characteristics of the transfer function from the left and right speakers to the left and right ears of the listener, which are necessary for the subsequent processing unit 95 of the sound processing unit 91, need only be written for each angle.

  That is, the user or the system installer attaches another speaker instead of the original speaker as the left speaker 11L and the right speaker 11R, and is provided to the user by a system manufacturer or the like, or is prepared by the system installer himself Then, the other speaker memory card 99 is attached to the memory card interface 98 of the source-side transceiver 80.

  A series of processing executed by the control unit 85 of the source-side transceiver 80 in this case may be a part of the processing shown in FIG.

  Specifically, after starting the processing, the control unit 85 of the source-side transceiver 80 first determines whether or not the memory card 99 is attached to the memory card interface 98 in a step before step 111 and not shown in FIG. Accordingly, it is determined whether the original speaker is used as the left speaker 11L and the right speaker 11R, or whether another speaker is used instead of the original speaker.

  When the original speakers are used as the left speaker 11L and the right speaker 11R, the processing parameters for the original speaker written in the ROM 82 are set in the post-processing unit 95 in steps 111 and 114. The processing after step 111 is executed.

  On the other hand, when another speaker is used as the left speaker 11L and the right speaker 11R in place of the original speaker, the processing parameters for the other speaker written in the memory card 99 are processed in steps 111 and 114 in the subsequent stage. The processing after step 111 is executed so as to be set in the unit 95.

  In the above example, the processing parameter for the first type speaker is written in the ROM 82 of the source-side transceiver 80, and the processing parameter for the second type speaker is written in the memory card 99. The processing parameter for the first type speaker and the processing parameter for the second type speaker are written in the ROM 82 of the source-side transceiver 80, and the processing parameter for the third type speaker is stored in the memory card 99. The system may be configured to be written.

  In this case, if the system is configured so that the user or system installer can set the type of the left speaker 11L and the right speaker 11R for the source-side transceiver 80 or the system. Good.

It is a figure which shows an example of the system of this invention. It is a figure where it uses for description of the angle of a speaker. It is a figure which shows an example of an angle sensor. It is a figure which shows an example of the detection characteristic of an angle sensor. It is a figure which shows an example of a source side transmitter / receiver and an audio | voice output side transmitter / receiver. It is a figure which shows an example of a sound image localization process. It is a figure where it uses for description of sound image localization. It is a figure which shows an example of the filter coefficient for every angle. It is a figure which shows an example of the state in which the angle of the speaker was adjusted. It is a figure which shows an example of the process which the control part of a source side transmitter / receiver performs.

Explanation of symbols

  Since all the main parts are described in the figure, they are omitted here.

Claims (7)

  Detecting the angle of the speaker installed so that the angle with respect to the reference plane can be changed, and changing the processing parameters of the sound image localization processing for the audio signal supplied to the speaker according to the detected angle value. A characteristic sound reproduction method. In the sound reproduction method of Claim 1,
As the above speaker, a left speaker and a right speaker are provided,
Processing parameters of sound image localization processing for sound signals supplied to the left speaker and the right speaker according to a detected value of the angle of the left speaker with respect to the reference surface and a detected value of the angle of the right speaker with respect to the reference surface A sound reproduction method characterized by changing the sound. In the sound reproduction method of Claim 1,
A method for reproducing sound, comprising: changing a process for an audio signal supplied to the speaker according to whether the speaker has a first speaker characteristic or a second speaker characteristic. A speaker installed so that the angle with respect to the reference plane can be changed;
An angle sensor for detecting an angle of the speaker with respect to the reference plane;
An audio processing unit that performs a sound image localization process on an audio signal supplied to the speaker;
A control unit that changes a processing parameter of a sound image localization process in the sound processing unit in accordance with an angle detection value by the angle sensor;
A sound reproduction system comprising: The sound reproduction system according to claim 4, wherein
As the above speaker, a left speaker and a right speaker are provided,
As the angle sensor, a left angle sensor that detects an angle of the left speaker with respect to the reference plane, and a right angle sensor that detects an angle of the right speaker with respect to the reference plane,
The control unit changes processing parameters of the sound image localization processing in the sound processing unit according to an angle detection value by the left angle sensor and an angle detection value by the right angle sensor.
A sound reproduction system characterized by that. The sound reproduction system according to claim 4, wherein
The control unit changes processing for an audio signal supplied to the speaker according to whether the speaker has a first speaker characteristic or a second speaker characteristic. Sound reproduction system. The sound reproduction system according to claim 4, wherein
A source-side transceiver that transmits an audio signal from a signal source, and an audio output-side transceiver that receives the audio signal transmitted from the source-side transceiver and supplies the audio signal to the speaker,
The audio processing unit and the control unit are provided in the source-side transceiver.
The angle detection value by the angle sensor is transmitted from the audio output side transceiver to the source side transceiver.
A sound reproduction system characterized by that.

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