WO2014171010A1 - Système de reproduction audio, dispositif de sortie audio, dispositif de commande et procédé de reproduction audio - Google Patents

Système de reproduction audio, dispositif de sortie audio, dispositif de commande et procédé de reproduction audio Download PDF

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Publication number
WO2014171010A1
WO2014171010A1 PCT/JP2013/061637 JP2013061637W WO2014171010A1 WO 2014171010 A1 WO2014171010 A1 WO 2014171010A1 JP 2013061637 W JP2013061637 W JP 2013061637W WO 2014171010 A1 WO2014171010 A1 WO 2014171010A1
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WO
WIPO (PCT)
Prior art keywords
audio
signal
time
audio signal
output devices
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PCT/JP2013/061637
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English (en)
Japanese (ja)
Inventor
一哉 本間
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Ｎｅｃディスプレイソリューションズ株式会社
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Priority to PCT/JP2013/061637 priority Critical patent/WO2014171010A1/fr
Publication of WO2014171010A1 publication Critical patent/WO2014171010A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • H04S1/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/15—Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops

Definitions

  • the present invention relates to an audio reproduction system, an audio output device, a control device, and an audio reproduction method for reproducing audio signals by a plurality of audio output devices.
  • Japanese Patent Application Laid-Open No. 2011-203619 discloses a projector having a projection unit that projects an image shown in an input video signal and an audio output unit that reproduces the input audio signal. ing.
  • an audio reproduction system that uses a plurality of such projectors and outputs audio in stereo while projecting an image has been studied.
  • FIG. 1 is a diagram showing the configuration of such an audio reproduction system.
  • control device 110 includes a control device 110, a projector 120-1 disposed on the right side of the viewer 1, and 120-2 disposed on the left side of the viewer 1.
  • the control device 110 is connected to the projectors 120-1 and 120-2 via a wired or wireless network 200.
  • the control device 110 inputs the video signal to the projectors 120-1 and 120-2 via the network 200.
  • the control device 110 generates a right channel audio signal and a left channel audio signal for stereo output at regular intervals, and the right channel audio signal is transmitted to the projector 120-1 by peer-to-peer. Then, the audio signal for the left channel is transmitted peer-to-peer to the projector 120-2.
  • the projector 120-1 reproduces the input audio signal for the right channel
  • the projector 120-2 reproduces the input audio signal for the left channel. In this way, the audio can be output in stereo.
  • FIG. 2 is a diagram showing operations of the control device 110 and the projectors 120-1 and 120-2 shown in FIG. 1 in time series. In the following, the operation of each device relating to audio reproduction will be described.
  • control device 110 When the control device 110 generates the audio signal for the right channel and the left channel, it outputs the audio signal for the right channel to the projector 120-1 at time t1, and then outputs the audio signal for the left channel to the projector at time t2. Output to 120-2.
  • a right channel audio signal is input to the projector 120-1
  • a left channel audio signal is input to the projector 120-2.
  • the projectors 120-1 and 120-2 reproduce the audio signal after a predetermined time L has elapsed for buffering. Accordingly, the projector 120-1 starts to reproduce the audio signal for the right channel at time t5 when the predetermined time L has elapsed from time t3.
  • the projector 120-2 starts reproducing the audio signal for the left channel at time t6 when the predetermined time L has elapsed from time t4.
  • a projector is usually provided with a system counter that outputs a count value counted by a system clock with a constant frequency.
  • the count value of the system counter is initialized when the projector is started, The count value is also different at different timings. Therefore, even if only the count value of the system counter is used, it is difficult to prevent a deviation in the reproduction timing of the audio signal between the projectors.
  • An object of the present invention is to provide an audio reproduction system, an audio output device, a control device, and an audio reproduction method that can suppress a deviation in reproduction timing of audio signals among a plurality of audio output devices.
  • an audio reproduction system of the present invention A plurality of audio output devices, a control device that outputs audio signals to the plurality of audio output devices, and a transmission device that transmits broadcast signals to the plurality of audio output devices,
  • the transmitter is Sending the broadcast signal according to a predetermined operation input
  • the controller is A first control unit that outputs the audio signal to each of the plurality of audio output devices when a request for reproduction of the audio signal is input;
  • Each of the plurality of audio output devices is A counter that outputs a count value;
  • a second control unit that outputs a notification signal indicating that the broadcast signal has been received to the control device when the reception unit receives the broadcast signal;
  • the first control unit adds time information indicating a predetermined time to the audio signal,
  • the second control unit indicates that the time indicated in the time information has elapsed from the time of reception of the broadcast signal
  • the audio output device of the present invention provides: An audio output device for reproducing an audio signal output from a control device, A counter that outputs a count value; A receiver for receiving a broadcast signal transmitted from the outside; An audio output unit for reproducing the audio signal; When the reception unit receives the broadcast signal and an audio signal to which time information indicating a predetermined time is added is input, the time information from the time of reception of the broadcast signal is determined according to the count value of the counter. And a controller that causes the audio output unit to reproduce the audio signal when it is confirmed that the time shown in FIG.
  • control device of the present invention provides: A control device that outputs audio signals to a plurality of audio output devices, A control unit that adds time information indicating a predetermined time for buffering the audio signal to the audio signal and outputs the audio signal to each of the plurality of audio output devices;
  • the audio reproduction method of the present invention comprises: A plurality of audio output devices each having a counter that outputs a count value; a control device that outputs audio signals to the plurality of audio output devices; and a transmission device that transmits broadcast signals to the plurality of audio output devices.
  • An audio playback method in an audio playback system comprising: The communication device transmits a broadcast signal to the plurality of audio output devices in response to a predetermined operation input; and An output step for outputting the audio signal to each of the plurality of audio output devices when the control device is input to request the reproduction of the audio signal; When each of the plurality of audio output devices receives the broadcast signal, a notification step of outputting a notification signal indicating that the broadcast signal has been received to the control device; Each of the plurality of audio output devices has a reproduction step of reproducing the audio signal when the audio signal is input; In the output step, when the notification signal is input, the control device adds time information indicating a predetermined time to the audio signal, In each of the plurality of audio output devices, when the audio signal to which the time information is added is input in the reproduction step, the time information is indicated in the time information from the time of reception of the broadcast signal by the count value of the counter. When it is confirmed that the recording time has elapsed, the audio signal is reproduced.
  • FIG. 3 is a diagram showing a configuration of the audio reproduction system 10 according to the embodiment of the present invention.
  • the audio reproduction system 10 shown in FIG. 3 includes a control device 11, projectors 12-1 and 12-2, and a remote controller 13.
  • the projectors 12-1 and 12-2 are examples of audio output devices, and the remote controller 13 is an example of a transmission device.
  • the control device 11 is connected to the projectors 12-1 and 12-2 via a wired or wireless network 20.
  • control device 11 When a request to reproduce at least one of a video signal and an audio signal is input, the control device 11 sends the video signal and audio signal requested to be reproduced to the projectors 12-1 and 12-2 via the network 20. input.
  • a specific example of the control device 11 is a computer.
  • Each of the projectors 12-1 and 12-2 projects the video signal input from the control device 11, and reproduces the audio signal input from the control device 11.
  • the projector 12-1 is disposed on the right side of the viewer 1
  • the projector 12-2 is disposed on the left side of the viewer 1.
  • the projector 12-1 and 12-2 are not distinguished, they are referred to as the projector 12.
  • the remote controller 13 transmits a remote control signal to the projectors 12-1 and 12-2, for example, according to the operation input of the viewer 1.
  • the remote controller 13 transmits a remote control signal by infrared light.
  • control device 11 the configuration of the control device 11, the projector 12, and the remote controller 13 will be described.
  • control device 11 First, the configuration of the control device 11 will be described with reference to FIG.
  • the control unit 41 is an example of a first control unit.
  • control unit 41 When the control unit 41 inputs a request to reproduce at least one of the video signal and the audio signal, the control unit 41 outputs the signal requested to be reproduced to each projector 12 via the network 20.
  • the video signal and the audio signal are stored in a storage unit (not shown in FIG. 4) or acquired from an external signal source in response to a request.
  • the projector 12 shown in FIG. 5 includes a receiving unit 51, a projecting unit 52, an audio output unit 53, a system counter 54, and a control unit 55.
  • the control unit 55 is an example of a second control unit.
  • the receiving unit 51 receives a remote control signal transmitted from the remote controller 13.
  • the projection unit 52 reproduces the video signal, that is, projects the video indicated by the video signal, under the control of the control unit 55. Although omitted from FIG. 5, the projection unit 52 projects a light source, a modulation element that modulates light emitted from the light source according to a video signal and outputs video light, and enlarges and projects the video light. It has a lens.
  • the audio output unit 53 reproduces an audio signal under the control of the control unit 55, that is, outputs the audio indicated by the audio signal.
  • the system counter 54 outputs a count value counted with a system clock having a constant frequency to the control unit 55.
  • the control unit 55 When the video signal is input via the network 20, the control unit 55 causes the projection unit 52 to reproduce the video signal.
  • the control unit 55 outputs the audio signal to the audio output unit 53. To play.
  • the remote controller 13 illustrated in FIG. 6 includes a control unit 61 and a transmission unit 62.
  • the control unit 61 causes the transmission unit 62 to transmit a remote control signal when a predetermined operation input is performed.
  • the transmission unit 62 transmits a remote control signal to the projector 12 under the control of the control unit 61.
  • projectors 12-1 and 12-2 are included in the range in which transmitter 62 can transmit the remote control signal.
  • control device 11 the projector 12, and the remote controller 13 will be described.
  • the remote controller 13 transmits a remote control signal when a predetermined operation input is performed.
  • the range in which the remote control signal can be transmitted includes the projectors 12-1 and 12-2. Therefore, the remote control signal is received by the projectors 12-1 and 12-2, respectively.
  • a remote control signal transmitted in response to a predetermined operation input is referred to as a broadcast signal.
  • the projectors 12-1 and 12-2 use the time when the broadcast signal is received as the reference time.
  • the projectors 12-1 and 12-2 can be synchronized by using the broadcast signal reception time as a reference time. it can.
  • control device 11 adds time information indicating a predetermined time to the audio signal and outputs it to the projector 12.
  • the projector 12 reproduces the audio signal after a predetermined time indicated by the time information has elapsed from the reference time.
  • the reference times of the projectors 12-1 and 12-2 are the same, and the audio signal is reproduced after a predetermined time has elapsed from the reference time. Playback timing can be synchronized.
  • the count value of the system counter 54 is used as a substitute for time. That is, the count value of the system counter 54 at a certain time becomes information indicating the time at that time, and the count number of the system counter 54 becomes information indicating the time. Note that the count value differs for each projector when the projector activation timing is different, but when the count value is used as the reference time, the count value as the reference time is set for each projector, so the count value as the reference time is It may be different for each projector.
  • FIG. 7 is a diagram showing the operations of the control device 11 and the projectors 12-1 and 12-2 before transmission of the broadcast signal in time series.
  • the operation of the control device 11 is mainly controlled by the control unit 41, and the operation of the audio output device 12 is mainly controlled by the control unit 55. Therefore, the operation of the control unit 41 and the control unit 55 will be mainly described below. explain.
  • the control unit 41 When the control device 11 is instructed to request the reproduction of the audio signal, the control unit 41 captures the audio to be reproduced at regular intervals, and generates the audio signal for the right channel and the left channel. In FIG. 7, the control unit 41 performs capture (n ⁇ 1) at time t71 to generate a right channel audio signal DR (n ⁇ 1) and a left channel audio signal DL (n ⁇ 1). Shall be.
  • the control unit 41 outputs the audio signal DR (n-1) to the projector 12-1 at time t72, and outputs the audio signal DL (n-1) to the projector 12-2 at time t73. Further, the control unit 41 stores the output time when the audio signal DR (n ⁇ 1) and the audio signal DL (n ⁇ 1) are output to each projector 12.
  • the control unit 41 stores the time output from the RTC circuit at the time when the audio signal is output as the output time when the audio signal is output.
  • the control unit 41 outputs a sound signal with a count value of a system counter provided in the control device 11 (not shown in FIG. 4). Store as output time.
  • the system counter provided in the control device 11 may be the same type as the system counter provided in the projector 12 and calculates information indicating time and time from the count value and the count number.
  • the frequency of the system clock need not be the same as the frequency of the system clock of the projector 12.
  • the control unit 55 of the projector 12-1 receives that indicates that the reception of the audio signal DR (n-1) is completed.
  • a completion signal CR (n ⁇ 1) is output to the control device 11.
  • the control unit 55 stores the arrival time of the audio signal DR (n ⁇ 1), that is, the count value of the system counter 54 when the audio signal DR (n ⁇ 1) is input, and serves as information indicating the arrival time. It is added to the reception completion signal CR (n-1).
  • the control unit 41 stores the input time of the reception completion signal CR (n ⁇ 1).
  • the control unit 55 of the projector 12-2 receives that indicates that the reception of the audio signal DL (n ⁇ 1) is completed.
  • the completion signal CL (n ⁇ 1) is output to the control device 11.
  • the control unit 55 stores the arrival time of the audio signal DL (n ⁇ 1), that is, the count value of the system counter 54 when the audio signal DL (n ⁇ 1) is input, and serves as information indicating the arrival time. It is added to the reception completion signal CL (n-1).
  • the control unit 41 When the reception completion signal CL (n ⁇ 1) is input to the control device 11 at time t77, the control unit 41 stores the input time of the reception completion signal CL (n ⁇ 1). Further, the control unit 41 determines the projector 12 based on the arrival time of the audio signal to each projector 12 indicated by the information added to the reception completion signal CR (n ⁇ 1) and the reception completion signal CL (n ⁇ 1). Measure the signal transmission state between
  • the control unit 41 calculates communication jitter and round trip time (RTT: Round Trip Time).
  • RTT Round Trip Time
  • the communication jitter is a fluctuation in the time required to reach the projector 12 after the audio signal is output.
  • RTT is the time required from when the control device 11 outputs an audio signal until reception completion data is input.
  • the control unit 41 uses the absolute value of the difference between the arrival time of the current audio signal and the arrival time of the immediately preceding audio signal and the audio capture interval as communication jitter. Shall. That is, the control unit 41 calculates communication jitter using the following equation (1).
  • Communication jitter
  • the information indicating the arrival time added to the reception completion signal is indicated by a count value.
  • the control unit 41 is preliminarily input with the count interval of the system counter 54, and the count value shown in the information added to the reception completion signal for the current audio signal and the reception completion signal for the immediately previous audio data By multiplying the difference between the count value indicated by the added information and the count interval of the system counter 54, the interval between the arrival time of the current audio signal and the arrival time of the immediately preceding audio signal can be calculated.
  • the count interval of the system counter 54 is input in advance to the control unit 41, the count interval may be added to the reception completion signal and transmitted. Further, the frequency of the system clock of the system counter 54 may be used instead of the count interval, and any information that can calculate the interval between the arrival time of the current audio signal and the arrival time of the immediately preceding audio signal from the count value may be used.
  • control unit 41 calculates the difference between the output time of the audio data and the input time of the reception completion signal for the audio data as RTT. That is, the control unit 41 calculates RTT using the following equation (2).
  • RTT input time of reception completion signal ⁇ output time of audio signal (2) Further, the control unit 41 calculates an average value of the past n RTTs.
  • the control unit 41 calculates communication jitter, RTT, and an average value thereof for each of the projectors 12-1 and 12-2. Note that the reception completion signal includes information for identifying each projector.
  • the control unit 41 When a predetermined time has elapsed since the capture (n-1) was performed, the control unit 41 performs capture (n) at time t78. Thereafter, in the same manner, an audio signal and a reception completion signal are input / output between the control device 11 and the projector 12.
  • the audio signal DL (n ⁇ 1) is input to the projector 12-2.
  • the signal input / output order may vary depending on the network route.
  • FIG. 8 is a diagram showing the operation of the control device 11 and the projectors 12-1 and 12-2 at the time of transmission of the broadcast signal in time series.
  • the control unit 61 causes the transmission unit 62 to transmit a broadcast signal to the projectors 12-1 and 12-2.
  • the broadcast signal is transmitted by infrared light from the transmission unit 62, the time at which the projectors 12-1 and 12-2 receive the broadcast signal is substantially the same.
  • the control unit 55 of each projector 12 receives the time at which the receiving unit 51 receives the broadcast signal as a reference time (hereinafter referred to as PJ reference time). ).
  • PJ reference time the time at which the projectors 12-1 and 12-2 receive the broadcast signal.
  • the control unit 55 outputs a notification signal indicating that the broadcast signal has been received to the control device 11.
  • the notification signal includes information for identifying each projector.
  • control unit 41 When a notification signal is input from each projector 12 to the control device 11, the control unit 41 stores the time when the notification signal is input from each projector 12. In addition, the control unit 41 temporarily stops the capture. The audio signal output is also stopped by the pause of the capture.
  • PC reference time notification signal input time-average value of RTT (3) Further, the control unit 41 calculates the buffering time of the audio signal for absorbing communication jitter in each projector 12 using the following equation (4).
  • Buffering time capture interval ⁇ K + communication jitter ⁇ L (4)
  • K and L are constants determined according to the network environment. In general, when the network 200 is a wireless LAN, the communication jitter is larger than when the network 200 is a wired LAN, so the buffering time becomes longer.
  • the playback reservation time is calculated from the capture time at which the capture was performed using the following equation (5).
  • Playback reservation time (Capture time-PC reference time) + Buffering time (5)
  • the control unit 41 calculates a playback reservation time as a relative time from the PC reference time.
  • the control unit 41 When the playback reservation time is calculated, the control unit 41 adds time information indicating the calculated playback reservation time to the audio signal output to each projector 12 and outputs it to each projector 12. In FIG. 8, the control unit 41 outputs the audio signal DR (0) to the projector 12-1 at time t83, and outputs the audio signal DL (0) after outputting the audio signal DR (0). Is output.
  • each projector 12 When an audio signal to which time information is added is input to each projector 12, the control unit 55 of each projector 12 causes the control device 11 to output a reception completion signal. Further, the control unit 55 calculates the reproduction time of the audio signal using the following equation (6), and buffers the audio signal until the calculated reproduction time.
  • Playback time PJ reference time + Playback reservation time ... Equation (6)
  • the control unit 55 inputs the audio signal to the playback queue, and outputs the audio output unit 53.
  • the projector 12-1 sequentially reproduces from the audio signal DR (0)
  • the projector 12-2 sequentially reproduces from the audio signal DL (0).
  • the reproduction timings of the audio signal DR (0) and the audio signal DL (0) match, and the audio can be output in stereo. .
  • control unit 55 inputs the audio signal as it is to the reproduction queue and sequentially reproduces it.
  • the PC reference time is set to a time before the PJ reference time by using Expression (3). That is, the RTT corresponds to the time from when the audio signal is output until the reception completion signal is input. Therefore, the time obtained by subtracting the RTT time from the input time of the notification signal is less than the PJ reference time.
  • the time before the audio signal is output from the control device 11 and input to the projector 12 is approximately the same time as the previous time. As described above, by setting the PC reference time to a time before the PJ reference time, the operation corresponds to the time required for transmission until the audio signal is output from the control device 11 and input to the projector 12.
  • the projector 12 can receive a predetermined audio signal within the reserved playback time.
  • the transmission time from the control device 11 to the projector 12 and the transmission time from the projector 12 to the control device 11 are substantially equal, and the expression (3)
  • the PC reference time and the PJ reference time may be set as substantially the same time by using a value obtained by multiplying (average value of RTT) by (1/2) instead of (average value of RTT).
  • the projector 12 receives the broadcast signal transmitted from the remote controller 13, and sets the time when the broadcast signal is received as the reference time.
  • the control device 11 calculates a predetermined time for buffering the audio signal based on the transmission state of the signal with each projector 12, and outputs the audio signal to which the time information indicating the predetermined time is added to each projector. 12 is output.
  • an audio signal to which time information is added is input to each projector 12, when it is confirmed by a count value of the system counter 54 that a predetermined time indicated in the time information has elapsed from the reference time, Play an audio signal.
  • the projectors 12-1 and 12-2 can be synchronized without using an RTC circuit or the like. Also, by reproducing the audio signal after a predetermined time has elapsed from the reference time, the audio reproduction timing of each projector 12 is synchronized without being affected by the difference in network path with each projector 12 or communication jitter. be able to.
  • the number of projectors 12 is two, and projectors 12-1 and 12-2 are provided corresponding to the audio signals for the right channel and the left channel, respectively.
  • the present invention is not limited to this.
  • the audio signals of three or more channels three or more projectors may be provided corresponding to the audio signals of each channel, and each projector 12 may reproduce only the audio signals of the corresponding channels. By doing so, it is possible to output a multi-channel audio signal in a surround manner.
  • control device 11 is described using an example in which the audio signal is separated for the right channel and the left channel.
  • the control device 11 may output audio signals of a plurality of channels to each projector 12, and each projector 12 may separately reproduce the audio signals of channels corresponding to the own device.
  • control device 11 outputs an audio signal to each projector 12, and each projector 12 outputs a reception completion signal for the audio signal to the control device 11.
  • communication jitter and RTT may be measured by inputting and outputting predetermined signals while a notification signal is input to the control device 11 and capture is temporarily stopped.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

L'invention concerne un système de reproduction audio qui comporte une pluralité de dispositifs de sortie audio, un dispositif de commande qui produit des signaux audio auxdits dispositifs de sortie audio, et un dispositif de transmission qui transmet un signal de diffusion aux dispositifs de sortie audio en réponse à une entrée d'utilisateur donnée. Le dispositif de commande a une première unité de commande qui passe un signal audio à chacun des dispositifs de sortie audio lorsqu'une entrée demande la reproduction dudit signal audio. Chacun des dispositifs de sortie audio possède un compteur qui génère une valeur de comptage, une unité de réception qui reçoit ledit signal de diffusion, une unit de sortie audio qui reproduit le signal audio, et une deuxième unité de commande qui produit un signal de notification au dispositif de commande quand cette unité de réception reçoit le signal de diffusion. Dès réception dudit signal de notification, la première unité de commande ajoute, à ce signal audio, des informations de durée indiquant une durée prescrite. À la réception d'un signal audio avec lesdites informations de durée ajoutées, chaque deuxième unité de commande fait que l'unité de sortie audio correspondante reproduit le signal audio quand ladite deuxième unité de commande a déterminé, au moyen de la valeur de comptage venant du compteur correspondant, que la durée indiquée par les informations de durée s'est écoulée depuis la réception du signal de diffusion.
PCT/JP2013/061637 2013-04-19 2013-04-19 Système de reproduction audio, dispositif de sortie audio, dispositif de commande et procédé de reproduction audio WO2014171010A1 (fr)

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PCT/JP2013/061637 WO2014171010A1 (fr) 2013-04-19 2013-04-19 Système de reproduction audio, dispositif de sortie audio, dispositif de commande et procédé de reproduction audio

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PCT/JP2013/061637 WO2014171010A1 (fr) 2013-04-19 2013-04-19 Système de reproduction audio, dispositif de sortie audio, dispositif de commande et procédé de reproduction audio

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004193868A (ja) * 2002-12-10 2004-07-08 Alps Electric Co Ltd 無線送受信システム及び無線送受信方法
JP2008060675A (ja) * 2006-08-29 2008-03-13 Sony Corp 音声再生装置、音声再生方法
JP2010258604A (ja) * 2009-04-22 2010-11-11 Sony Corp オーディオ処理装置及びオーディオ処理方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004193868A (ja) * 2002-12-10 2004-07-08 Alps Electric Co Ltd 無線送受信システム及び無線送受信方法
JP2008060675A (ja) * 2006-08-29 2008-03-13 Sony Corp 音声再生装置、音声再生方法
JP2010258604A (ja) * 2009-04-22 2010-11-11 Sony Corp オーディオ処理装置及びオーディオ処理方法

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