WO2014171010A1 - Audio reproduction system, audio output device, control device, and audio reproduction method - Google Patents

Audio reproduction system, audio output device, control device, and audio reproduction method 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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audio
signal
time
audio signal
output devices
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PCT/JP2013/061637
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French (fr)
Japanese (ja)
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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/en
Publication of WO2014171010A1 publication Critical patent/WO2014171010A1/en

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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.

Abstract

This audio reproduction system is provided with a plurality of audio output devices, a control device that outputs audio signals to said audio output devices, and a transmission device that transmits a broadcast signal to the audio output devices in response to given user input. The control device has a first control unit that outputs an audio signal to each of the audio output devices upon input requesting the reproduction of said audio signal. Each of the audio output devices has a counter that outputs a count value, a reception unit that receives the abovementioned broadcast signal, an audio output unit that reproduces the audio signal, and a second control unit that outputs a notification signal to the control device when that reception unit receives the broadcast signal. Upon receiving said notification signal, the first control unit adds, to that audio signal, length-of-time information indicating a prescribed length of time. Upon receiving an audio signal with said length-of-time information added, each second control unit makes the corresponding audio output unit reproduce the audio signal when said second control unit has ascertained, using the count value from the corresponding counter, that the amount of time indicated by the length-of-time information has elapsed since the broadcast signal was received.

Description

音声再生システム、音声出力装置、制御装置および音声再生方法Audio reproduction system, audio output device, control device, and audio reproduction method
　本発明は、複数の音声出力装置により音声信号を再生する音声再生システム、音声出力装置、制御装置および音声再生方法に関する。 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.
　特許文献１（特開２０１１－２０３６１９号公報）には、入力された映像信号に示される映像を投写する投写部と、入力された音声信号を再生する音声出力部と、を有するプロジェクターが開示されている。近年、このようなプロジェクターを複数用い、映像を投写しながら、音声をステレオ出力する音声再生システムが検討されている。図１は、このような音声再生システムの構成を示す図である。 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. In recent years, 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.
　図１に示す音声再生システム１００は、制御装置１１０と、視聴者１の右側に配置されたプロジェクター１２０－１と、視聴者１の左側に配置された１２０－２と、を備える。 1 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.
　制御装置１１０は、プロジェクター１２０－１，１２０－２と有線あるいは無線のネットワーク２００を介して接続されている。 The control device 110 is connected to the projectors 120-1 and 120-2 via a wired or wireless network 200.
　制御装置１１０は、映像信号をネットワーク２００を介してプロジェクター１２０－１，１２０－２に入力する。また、制御装置１１０は、ステレオ出力するための右チャンネル用の音声信号および左チャンネル用の音声信号を一定間隔で生成し、右チャンネル用の音声信号をプロジェクター１２０－１にピアツーピア（Ｐｅｅｒ　ｔｏ　Ｐｅｅｒ）伝送し、左チャンネル用の音声信号をプロジェクター１２０－２にピアツーピア伝送する。 The control device 110 inputs the video signal to the projectors 120-1 and 120-2 via the network 200. In addition, 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.
　プロジェクター１２０－１は、入力された右チャンネル用の音声信号を再生し、プロジェクター１２０－２は、入力された左チャンネル用の音声信号を再生する。こうすることで、音声をステレオ出力することができる。 The projector 120-1 reproduces the input audio signal for the right channel, and the projector 120-2 reproduces the input audio signal for the left channel. In this way, the audio can be output in stereo.
特開２０１１－２０３６１９号公報JP2011-203619A
　図２は、図１に示す制御装置１１０、プロジェクター１２０－１，１２０－２の動作を時系列的に示す図である。なお、以下では、音声再生に関する各装置の動作を説明する。 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.
　制御装置１１０は、右チャンネル用および左チャンネル用の音声信号を生成すると、時刻ｔ１において右チャンネル用の音声信号をプロジェクター１２０－１に出力し、その後、時刻ｔ２において左チャンネル用の音声信号をプロジェクター１２０－２に出力する。 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.
　時刻ｔ３において、プロジェクター１２０－１に右チャンネル用の音声信号が入力され、時刻ｔ４において、プロジェクター１２０－２に左チャンネル用の音声信号が入力される。プロジェクター１２０－１，１２０－２は、音声信号が入力されると、バッファリングのために所定時間Ｌだけ経過した後に、音声信号を再生する。したがって、プロジェクター１２０－１は、時刻ｔ３から所定時間Ｌが経過した時刻ｔ５において、右チャンネル用の音声信号の再生を開始する。また、プロジェクター１２０－２は、時刻ｔ４から所定時間Ｌが経過した時刻ｔ６において、左チャンネル用の音声信号の再生を開始する。 At time t3, a right channel audio signal is input to the projector 120-1, and at time t4, a left channel audio signal is input to the projector 120-2. When an audio signal is input, 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. In addition, 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.
　ここで、図２に示すように、プロジェクター１２０－１とプロジェクター１２０－２とで音声信号の出力時刻にずれがある。また、音声信号が伝送されるネットワーク経路の違いなどにより、制御装置１１０からプロジェクター１２０－１への音声信号の伝送時間ｔＲと制御装置１１０からプロジェクター１２０－２への音声信号の伝送時間ｔＬとに差が生じることがある。 Here, as shown in FIG. 2, there is a difference in the output time of the audio signal between the projector 120-1 and the projector 120-2. In addition, due to a difference in the network path through which the audio signal is transmitted, the transmission time tR of the audio signal from the control device 110 to the projector 120-1 and the transmission time tL of the audio signal from the control device 110 to the projector 120-2. Differences can occur.
　プロジェクター１２０－１，１２０－２への音声信号の出力時刻のずれや音声信号の伝送時間の差のために、図２に示すように、プロジェクター１２０－１とプロジェクター１２０－２とで音声信号の再生タイミングがずれてしまうという問題がある。 Due to the difference in the output time of the audio signal to the projectors 120-1 and 120-2 and the difference in the transmission time of the audio signal, as shown in FIG. There is a problem that the reproduction timing is shifted.
　プロジェクター間での音声信号の再生タイミングのずれを防ぐ方法として、ＲＴＣ（Real Time Clock）回路を各プロジェクターに設け、音声信号の再生を開始する時刻を指定する方法がある。しかし、この方法では、ＲＴＣ回路を設けるために、コストが増大してしまう。 As a method for preventing the deviation of the reproduction timing of the audio signal between the projectors, there is a method in which an RTC (Real Time Clock) circuit is provided in each projector and the time for starting the reproduction of the audio signal is designated. However, in this method, since the RTC circuit is provided, the cost increases.
　なお、プロジェクターには通常、周波数が一定のシステムクロックでカウントしたカウント値を出力するシステムカウンタが設けられているが、システムカウンタのカウント値は、プロジェクターの起動時に初期化されるため、プロジェクターの起動タイミングが異なるとカウント値も異なる。そのため、システムカウンタのカウント値だけを用いてもプロジェクター間での音声信号の再生タイミングのずれを防ぐことは難しい。 Note that a projector is usually provided with a system counter that outputs a count value counted by a system clock with a constant frequency. However, since 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.
　本発明の目的は、複数の音声出力装置間での音声信号の再生タイミングのずれを抑制することができる音声再生システム、音声出力装置、制御装置および音声再生方法を提供することにある。 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.
　上記目的を達成するために本発明の音声再生システムは、
　複数の音声出力装置と、前記複数の音声出力装置に音声信号を出力する制御装置と、前記複数の音声出力装置に同報信号を送信する送信装置と、を備え、
　前記送信装置は、
　所定の操作入力に応じて前記同報信号を送信し、
　前記制御装置は、
　前記音声信号の再生を要求する旨が入力されると、前記音声信号を前記複数の音声出力装置の各々に出力する第１の制御部を有し、
　前記複数の音声出力装置の各々は、
　カウント値を出力するカウンタと、
　前記同報信号を受信する受信部と、
　前記音声信号を再生する音声出力部と、
　前記受信部が前記同報信号を受信すると、前記同報信号を受信したことを示す通知信号を前記制御装置へ出力する第２の制御部と、を有し、
　前記第１の制御部は、前記通知信号が入力されると、所定の時間を示す時間情報を前記音声信号に付加し、
　前記第２の制御部は、前記時間情報が付加された音声信号が入力されると、前記カウンタのカウント値により、前記同報信号の受信時から前記時間情報に示される時間が経過したことが確認されると、前記音声信号を前記音声出力部に再生させる。 In order to achieve the above object, 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 receiver for receiving the broadcast signal;
An audio output unit for reproducing the audio signal;
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;
When the notification signal is input, the first control unit adds time information indicating a predetermined time to the audio signal,
When the audio signal to which the time information is added is input, the second control unit indicates that the time indicated in the time information has elapsed from the time of reception of the broadcast signal according to the count value of the counter. If confirmed, the audio output unit reproduces the audio signal.
　上記目的を達成するために本発明の音声出力装置は、
　制御装置から出力された音声信号を再生する音声出力装置であって、
　カウント値を出力するカウンタと、
　外部から送信されてきた同報信号を受信する受信部と、
　前記音声信号を再生する音声出力部と、
　前記受信部が前記同報信号を受信するとともに、所定の時間を示す時間情報が付加された音声信号が入力されると、前記カウンタのカウント値により、前記同報信号の受信時から前記時間情報に示される時間が経過したことが確認されると、前記音声信号を前記音声出力部に再生させる制御部と、を有する。 In order to achieve the above object, 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.
　上記目的を達成するために本発明の制御装置は、
　複数の音声出力装置に音声信号を出力する制御装置であって、
　前記音声信号に該音声信号をバッファする所定の時間を示す時間情報を付加して前記複数の音声出力装置の各々へ出力する制御部を有する。 In order to achieve the above object, the 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;
　上記目的を達成するために本発明の音声再生方法は、
　カウント値を出力するカウンタをそれぞれ有する複数の音声出力装置と、前記複数の音声出力装置に音声信号を出力する制御装置と、前記複数の音声出力装置に同報信号を送信する送信装置と、を備える音声再生システムにおける音声再生方法であって、
　前記通信装置が、所定の操作入力に応じて、同報信号を前記複数の音声出力装置に送信する送信ステップと、
　前記制御装置が、前記音声信号の再生を要求する旨が入力されると、前記音声信号を前記複数の音声出力装置の各々へ出力する出力ステップと、
　前記複数の音声出力装置の各々が、前記同報信号を受信すると、前記同報信号を受信したことを示す通知信号を前記制御装置へ出力する通知ステップと、
　前記複数の音声出力装置の各々が、前記音声信号が入力されると、該音声信号を再生する再生ステップと、を有し、
　前記制御装置は、前記出力ステップでは、前記通知信号が入力されると、前記音声信号に所定の時間を示す時間情報を付加し、
　前記複数の音声出力装置の各々は、前記再生ステップでは、前記時間情報が付加された音声信号が入力されると、前記カウンタのカウント値により、前記同報信号の受信時から前記時間情報に示される時間が経過したことが確認されると、前記音声信号を再生する。 In order to achieve the above object, 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.
　本発明によれば、複数の音声出力装置で音声信号の再生タイミングを同期させることができる。 According to the present invention, it is possible to synchronize the reproduction timing of the audio signal with a plurality of audio output devices.
関連する音声再生システムの構成を示す図である。It is a figure which shows the structure of a related audio | voice reproduction | regeneration system. 図１に示す制御装置およびプロジェクターの動作を示す図である。It is a figure which shows operation | movement of the control apparatus and projector shown in FIG. 本発明の一実施形態の音声再生システムの構成を示す図である。It is a figure which shows the structure of the audio | voice reproduction | regeneration system of one Embodiment of this invention. 図３に示す制御装置の要部構成を示す図である。It is a figure which shows the principal part structure of the control apparatus shown in FIG. 図３に示すプロジェクターの要部構成を示す図である。It is a figure which shows the principal part structure of the projector shown in FIG. 図３に示すリモートコントローラの要部構成を示す図である。It is a figure which shows the principal part structure of the remote controller shown in FIG. 図３に示す制御装置およびプロジェクターの動作を示す図である。It is a figure which shows operation | movement of the control apparatus and projector which are shown in FIG. 図３に示す制御装置およびプロジェクターの動作を示す図である。It is a figure which shows operation | movement of the control apparatus and projector which are shown in FIG.
　以下に、本発明を実施するための形態について図面を参照して説明する。 Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
　図３は、本発明の一実施形態の音声再生システム１０の構成を示す図である。 FIG. 3 is a diagram showing a configuration of the audio reproduction system 10 according to the embodiment of the present invention.
　図３に示す音声再生システム１０は、制御装置１１と、プロジェクター１２－１，１２－２と、リモートコントローラ１３と、を有する。プロジェクター１２－１，１２－２は音声出力装置の一例であり、リモートコントローラ１３は送信装置の一例である。 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.
　制御装置１１は、プロジェクター１２－１，１２－２と有線あるいは無線のネットワーク２０を介して接続される。 The control device 11 is connected to the projectors 12-1 and 12-2 via a wired or wireless network 20.
　制御装置１１は、映像信号および音声信号の少なくとも一方の再生を要求する旨が入力されると、再生を要求された映像信号、音声信号をプロジェクター１２－１，１２－２にネットワーク２０を介して入力する。なお、制御装置１１の具体例としては、コンピュータなどがある。 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.
　プロジェクター１２－１，１２－２はそれぞれ、制御装置１１から入力された映像信号を投写し、また、制御装置１１から入力された音声信号を再生する。ここで、プロジェクター１２－１は、視聴者１の右側に配置され、プロジェクター１２－２は、視聴者１の左側に配置されている。なお、以下では、プロジェクター１２－１，１２－２を区別しない場合には、プロジェクター１２と称する。 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. Here, the projector 12-1 is disposed on the right side of the viewer 1, and the projector 12-2 is disposed on the left side of the viewer 1. Hereinafter, when the projectors 12-1 and 12-2 are not distinguished, they are referred to as the projector 12.
　リモートコントローラ１３は、例えば、視聴者１の操作入力に応じて、プロジェクター１２－１，１２－２にリモコン信号を送信する。なお、リモートコントローラ１３は、例えば、赤外光によりリモコン信号を送信する。 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. For example, the remote controller 13 transmits a remote control signal by infrared light.
　次に、制御装置１１、プロジェクター１２およびリモートコントローラ１３の構成について説明する。 Next, the configuration of the control device 11, the projector 12, and the remote controller 13 will be described.
　まず、制御装置１１の構成について図４を参照して説明する。 First, the configuration of the control device 11 will be described with reference to FIG.
　図４に示す制御装置１１は、制御部４１を有する。制御部４１は、第１の制御部の一例である。 The control device 11 shown in FIG. The control unit 41 is an example of a first control unit.
　制御部４１は、映像信号および音声信号の少なくとも一方の再生を要求する旨が入力されると、ネットワーク２０を介して、再生を要求された信号を各プロジェクター１２に出力する。なお、映像信号および音声信号は、図４においては不図示の記憶部に記憶されていたり、要求に応じて外部の信号源から取得されたりする。 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. Note that 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.
　次に、プロジェクター１２の構成について図５を参照して説明する。 Next, the configuration of the projector 12 will be described with reference to FIG.
　図５に示すプロジェクター１２は、受信部５１と、投写部５２と、音声出力部５３と、システムカウンタ５４と、制御部５５と、を有する。制御部５５は、第２の制御部の一例である。 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.
　受信部５１は、リモートコントローラ１３から送信されてきたリモコン信号を受信する。 The receiving unit 51 receives a remote control signal transmitted from the remote controller 13.
　投写部５２は、制御部５５の制御に応じて、映像信号を再生、すなわち、映像信号に示される映像を投写する。なお、図５においては記載を省略したが、投写部５２は、光源、光源から出射された光を映像信号に応じて変調して映像光を出力する変調素子、映像光を拡大して投写するレンズなどを備えている。 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.
　音声出力部５３は、制御部５５の制御に応じて、音声信号を再生、すなわち、音声信号に示される音声を出力する。 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.
　システムカウンタ５４は、周波数が一定のシステムクロックでカウントしたカウント値を制御部５５に出力する。 The system counter 54 outputs a count value counted with a system clock having a constant frequency to the control unit 55.
　制御部５５は、ネットワーク２０を介して映像信号が入力されると、その映像信号を投写部５２に再生させ、ネットワーク２０を介して音声信号が入力されると、その音声信号を音声出力部５３に再生させる。 When the video signal is input via the network 20, the control unit 55 causes the projection unit 52 to reproduce the video signal. When the audio signal is input via the network 20, the control unit 55 outputs the audio signal to the audio output unit 53. To play.
　次に、リモートコントローラ１３の構成について図６を参照して説明する。 Next, the configuration of the remote controller 13 will be described with reference to FIG.
　図６に示すリモートコントローラ１３は、制御部６１と、送信部６２と、を有する。 6 includes a control unit 61 and a transmission unit 62. The remote controller 13 illustrated in FIG.
　制御部６１は、所定の操作入力が行われると、送信部６２にリモコン信号を送信させる。 The control unit 61 causes the transmission unit 62 to transmit a remote control signal when a predetermined operation input is performed.
　送信部６２は、制御部６１の制御に応じて、リモコン信号をプロジェクター１２に送信する。ここで、送信部６２がリモコン信号を送信可能な範囲にはプロジェクター１２－１，１２－２が含まれるものとする。 The transmission unit 62 transmits a remote control signal to the projector 12 under the control of the control unit 61. Here, it is assumed that projectors 12-1 and 12-2 are included in the range in which transmitter 62 can transmit the remote control signal.
　次に、制御装置１１、プロジェクター１２およびリモートコントローラ１３の動作について説明する。なお、本発明は主に、音声再生に関するものであるため、以下では、音声再生に関する各装置の動作を中心に説明する。 Next, operations of the control device 11, the projector 12, and the remote controller 13 will be described. Since the present invention mainly relates to audio reproduction, the following description will focus on the operation of each device relating to audio reproduction.
　まず、制御装置１１、プロジェクター１２およびリモートコントローラ１３の概要について説明する。 First, an overview of the control device 11, the projector 12, and the remote controller 13 will be described.
　リモートコントローラ１３は、所定の操作入力が行われると、リモコン信号を送信する。ここで、上述したように、リモコン信号を送信可能な範囲にはプロジェクター１２－１，１２－２が含まれるため、そのリモコン信号は、プロジェクター１２－１，１２－２それぞれに受信される。以下では、所定の操作入力に応じて送信されるリモコン信号を同報信号と称する。 The remote controller 13 transmits a remote control signal when a predetermined operation input is performed. Here, as described above, 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. Hereinafter, a remote control signal transmitted in response to a predetermined operation input is referred to as a broadcast signal.
　同報信号を受信すると、プロジェクター１２－１，１２－２は、同報信号を受信した時刻を基準時刻とする。ここで、同報信号はプロジェクター１２－１，１２－２により略同時に受信されるので、同報信号の受信時刻を基準時刻とすることで、プロジェクター１２－１，１２－２を同期させることができる。 When the broadcast signal is received, the projectors 12-1 and 12-2 use the time when the broadcast signal is received as the reference time. Here, since the broadcast signals are received almost simultaneously by the projectors 12-1 and 12-2, the projectors 12-1 and 12-2 can be synchronized by using the broadcast signal reception time as a reference time. it can.
　また、制御装置１１は、音声信号に所定の時間を示す時間情報を付加してプロジェクター１２に出力する。プロジェクター１２は、時間情報が付加された音声信号が入力されると、基準時刻から時間情報に示される所定の時間が経過した後に、音声信号を再生する。 Also, the control device 11 adds time information indicating a predetermined time to the audio signal and outputs it to the projector 12. When an audio signal to which time information is added is input, the projector 12 reproduces the audio signal after a predetermined time indicated by the time information has elapsed from the reference time.
　プロジェクター１２－１，１２－２の基準時刻は一致しており、基準時刻から所定の時間が経過した後に音声信号を再生するため、ネットワーク経路の違いなどがあっても、プロジェクター間で音声信号の再生タイミングを同期させることができる。 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.
　以下、音声をステレオ出力する場合を例として、各装置の動作をより詳細に説明する。 Hereinafter, the operation of each device will be described in more detail by taking as an example the case of outputting audio in stereo.
　なお、上述したように、プロジェクター１２－１，１２－２には、ＲＴＣ回路などが設けられておらず、時刻を特定することができない。そこで、本実施形態においては、システムカウンタ５４のカウント値を時刻の代用として用いる。すなわち、ある時点におけるシステムカウンタ５４のカウント値が、その時点の時刻を示す情報となり、また、システムカウンタ５４のカウント数が時間を示す情報となる。なお、プロジェクターの起動タイミングが異なるとプロジェクター毎にカウント値も異なるが、基準時刻としてカウント値を用いる場合、基準時刻とするカウント値はプロジェクター毎にそれぞれ設定されるので、基準時刻とするカウント値はプロジェクター毎に異なっても良い。 As described above, the projectors 12-1 and 12-2 are not provided with an RTC circuit or the like, and the time cannot be specified. Therefore, in the present embodiment, 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.
　図７は、同報信号の送信前の制御装置１１、プロジェクター１２－１，１２－２の動作を時系列的に示す図である。なお、制御装置１１の動作は主に制御部４１により制御され、音声出力装置１２の動作は主に制御部５５により制御されるため、以下では、制御部４１および制御部５５の動作を中心に説明する。 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.
　制御装置１１に音声信号の再生を要求する旨が入力されると、制御部４１は、一定間隔で再生する音声をキャプチャし、右チャンネル用および左チャンネル用の音声信号を生成する。図７においては、制御部４１は、時刻ｔ７１において、キャプチャ（ｎ－１）を行い、右チャンネル用の音声信号ＤＲ（ｎ－１）および左チャンネル用の音声信号ＤＬ（ｎ－１）を生成したものとする。 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.
　制御部４１は、時刻ｔ７２において、音声信号ＤＲ（ｎ－１）をプロジェクター１２－１に出力し、時刻ｔ７３において、音声信号ＤＬ（ｎ－１）をプロジェクター１２－２に出力する。また、制御部４１は、音声信号ＤＲ（ｎ－１）および音声信号ＤＬ（ｎ－１）を各プロジェクター１２に出力した出力時刻を記憶する。なお、制御装置１１にＲＴＣ回路が設けられている場合には、制御部４１は、音声信号を出力した時点でＲＴＣ回路から出力される時刻を音声信号を出力した出力時刻として記憶する。また、制御装置１１にＲＴＣ回路が設けられていない場合には、制御部４１は、制御装置１１に設けられている、図４においては不図示のシステムカウンタのカウント値を、音声信号を出力した出力時刻として記憶する。なお、制御装置１１に設けられているシステムカウンタは、プロジェクター１２に設けられているシステムカウンタと同種のものでも良く、カウント値およびカウント数から時刻および時間を示す情報を算出する。ただし、システムクロックの周波数は、プロジェクター１２のシステムクロックの周波数と同じである必要は無い。 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. When the controller 11 is provided with the RTC circuit, 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. When the control device 11 is not provided with an RTC circuit, 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. However, the frequency of the system clock need not be the same as the frequency of the system clock of the projector 12.
　時刻ｔ７４において、プロジェクター１２－１に音声信号ＤＲ（ｎ－１）が入力されると、プロジェクター１２－１の制御部５５は、音声信号ＤＲ（ｎ－１）の受信が完了した旨を示す受信完了信号ＣＲ（ｎ－１）を制御装置１１に出力する。ここで、制御部５５は、音声信号ＤＲ（ｎ－１）の到達時刻、すなわち、音声信号ＤＲ（ｎ－１）の入力時におけるシステムカウンタ５４のカウント値を記憶し、到達時刻を示す情報として受信完了信号ＣＲ（ｎ－１）に付加する。 When the audio signal DR (n-1) is input to the projector 12-1 at time t74, 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. Here, 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).
　時刻ｔ７５において、制御装置１１に受信完了信号ＣＲ（ｎ－１）が入力されると、制御部４１は、受信完了信号ＣＲ（ｎ－１）の入力時刻を記憶する。 When the reception completion signal CR (n−1) is input to the control device 11 at time t75, the control unit 41 stores the input time of the reception completion signal CR (n−1).
　時刻ｔ７６において、プロジェクター１２－２に音声信号ＤＬ（ｎ－１）が入力されると、プロジェクター１２－２の制御部５５は、音声信号ＤＬ（ｎ－１）の受信が完了した旨を示す受信完了信号ＣＬ（ｎ－１）を制御装置１１に出力する。ここで、制御部５５は、音声信号ＤＬ（ｎ－１）の到達時刻、すなわち、音声信号ＤＬ（ｎ－１）の入力時におけるシステムカウンタ５４のカウント値を記憶し、到達時刻を示す情報として受信完了信号ＣＬ（ｎ－１）に付加する。 When the audio signal DL (n−1) is input to the projector 12-2 at time t76, 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. Here, 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).
　時刻ｔ７７において、制御装置１１に受信完了信号ＣＬ（ｎ－１）が入力されると、制御部４１は、受信完了信号ＣＬ（ｎ－１）の入力時刻を記憶する。さらに、制御部４１は、受信完了信号ＣＲ（ｎ－１）および受信完了信号ＣＬ（ｎ－１）に付加された情報に示される各プロジェクター１２への音声信号の到達時刻に基づいて、プロジェクター１２との間の信号の伝送状態を計測する。 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
　具体的には、制御部４１は、通信ジッタおよびラウンドトリップタイム（ＲＴＴ：Ｒｏｕｎｄ　Ｔｒｉｐ　Ｔｉｍｅ）を算出する。ここで、通信ジッタとは、音声信号が出力されてからプロジェクター１２に到達するまでに要する時間の揺らぎのことである。また、ＲＴＴとは、制御装置１１が音声信号を出力してから、受信完了データが入力されるまでの所要時間のことである。本実施形態においては、便宜的に、制御部４１は、現在の音声信号の到達時刻と直前音声信号の到達時刻との間隔と、音声のキャプチャ間隔と、の差の絶対値を通信ジッタとするものとする。すなわち、制御部４１は、以下の式（１）を用いて、通信ジッタを算出する。 Specifically, the control unit 41 calculates communication jitter and round trip time (RTT: Round Trip Time). Here, 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. In the present embodiment, for the sake of convenience, 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).
　通信ジッタ　＝　｜（現在の音声信号の到達時刻　－　直前の音声信号の到達時刻）　－　音声のキャプチャ間隔｜・・・式（１）
　なお、上述したように、受信完了信号に付加された到達時刻を示す情報はカウント値で示される。制御部４１にはシステムカウンタ５４のカウント間隔が予め入力されるなどしており、現在の音声信号に対する受信完了信号に付加された情報に示されるカウント値と、直前の音声データに対する受信完了信号に付加された情報に示されるカウント値と、の差にシステムカウンタ５４のカウント間隔を乗ずることで、現在の音声信号の到達時刻と直前音声信号の到達時刻との間隔を算出することができる。なお、制御部４１にはシステムカウンタ５４のカウント間隔が予め入力されるとしたが、カウント間隔は受信完了信号に付加されて送信されてもよい。また、カウント間隔の代わりに、システムカウンタ５４のシステムクロックの周波数等でもよく、カウント値から現在の音声信号の到達時刻と直前音声信号の到達時刻との間隔を算出できる情報であれば良い。 Communication jitter = | (current audio signal arrival time-previous audio signal arrival time)-audio capture interval | ... (1)
As described above, 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. Although 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.
　また、制御部４１は、音声データの出力時刻とその音声データに対する受信完了信号の入力時刻との差をＲＴＴとして算出する。すなわち、制御部４１は、以下の式（２）を用いて、ＲＴＴを算出する。 Further, the 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　＝　受信完了信号の入力時刻　－　音声信号の出力時刻・・・式（２）
　さらに、制御部４１は、過去ｎ回のＲＴＴの平均値を算出する。 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.
　制御部４１は、プロジェクター１２－１，１２－２それぞれについて、通信ジッタと、ＲＴＴおよびその平均値とを算出する。なお、受信完了信号には、各プロジェクターを識別するための情報も含まれる。 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.
　キャプチャ（ｎ－１）を行ってから所定時間が経過すると、時刻ｔ７８において、制御部４１は、キャプチャ（ｎ）を行う。以下、同様にして、制御装置１１とプロジェクター１２との間で、音声信号および受信完了信号の入出力が行われる。 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.
　なお、図７においては、音声信号ＤＲ（ｎ－１）に対する受信完了信号ＣＲ（ｎ－１）が制御装置１１に入力された後に、音声信号ＤＬ（ｎ－１）がプロジェクター１２－２に入力される例を用いて説明したが、これらに信号の入出力の順序はネットワーク経路の違いなどにより前後することがある。 In FIG. 7, after the reception completion signal CR (n−1) for the audio signal DR (n−1) is input to the control device 11, the audio signal DL (n−1) is input to the projector 12-2. However, the signal input / output order may vary depending on the network route.
　図８は、同報信号の送信時の制御装置１１、プロジェクター１２－１，１２－２の動作を時系列的に示した図である。 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.
　時刻ｔ８１において、リモートコントローラ１３に所定の操作入力が行われると、制御部６１は、同報信号を送信部６２にプロジェクター１２－１，１２－２へ送信させる。上述したように、送信部６２からは赤外光により同報信号が送信されるので、プロジェクター１２－１，１２－２が同報信号を受信する時刻は略同一となる。 At time t81, when a predetermined operation input is performed on the remote controller 13, the control unit 61 causes the transmission unit 62 to transmit a broadcast signal to the projectors 12-1 and 12-2. As described above, since 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.
　時刻ｔ８２において、各プロジェクター１２の受信部５１が同報信号を受信すると、各プロジェクター１２の制御部５５は、受信部５１が同報信号を受信した時刻を基準時刻（以下、ＰＪ基準時刻と称する）として決定する。ここで、上述したように、プロジェクター１２－１，１２－２が同報信号を受信する時刻は略同一となるため、各プロジェクター１２のＰＪ基準時刻は略同一となる。したがって、プロジェクター１２－１，１２－２が同期した状態となる。 When the receiving unit 51 of each projector 12 receives the broadcast signal at time t82, 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). ). Here, as described above, the time at which the projectors 12-1 and 12-2 receive the broadcast signal is substantially the same, so the PJ reference time of each projector 12 is substantially the same. Therefore, the projectors 12-1 and 12-2 are in a synchronized state.
　制御部５５は、同報信号を受信した旨を示す通知信号を制御装置１１に出力する。通知信号には、各プロジェクターを識別するための情報も含まれる。 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.
　制御装置１１に各プロジェクター１２から通知信号が入力されると、制御部４１は、各プロジェクター１２から通知信号が入力された時刻を記憶する。また、制御部４１は、キャプチャを一時停止する。キャプチャの一時停止により、音声信号の出力も停止される。 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.
　すべてのプロジェクター１２から通知信号が入力されると、ＲＴＴの平均値が最も大きいプロジェクター１２のＲＴＴの平均値（ＲＴＴL）と、そのプロジェクター１２から通知信号が入力された時刻とに基づいて、以下の式（３）を用いて、制御装置１１における基準時刻（以下、ＰＣ基準時刻と称する）を算出する。 When notification signals are input from all the projectors 12, based on the average RTT value (RTT L ) of the projector 12 having the largest average RTT value and the time when the notification signal is input from the projector 12, Is used to calculate a reference time in the control device 11 (hereinafter referred to as a PC reference time).
　ＰＣ基準時刻　＝　通知信号の入力時刻　－　ＲＴＴの平均値・・・式（３）
　また、制御部４１は、各プロジェクター１２において通信ジッタを吸収するための音声信号のバッファリング時間を、以下の式（４）を用いて算出する。 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).
　バッファリング時間　＝　キャプチャ間隔　×　Ｋ　＋　通信ジッタ　×　Ｌ・・・式（４）
　式（４）において、Ｋ，Ｌはネットワーク環境に応じて定められる定数である。なお、一般的に、ネットワーク２００が無線ＬＡＮである場合には有線ＬＡＮである場合よりも通信ジッタが大きいため、バッファリング時間は長くなる。 Buffering time = capture interval × K + communication jitter × L (4)
In Equation (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.
　次に、制御部４１は、キャプチャを再開し、キャプチャにより音声信号を生成すると、キャプチャを行ったキャプチャ時刻から再生予約時間を、以下の式（５）を用いて算出する。 Next, when the control unit 41 resumes the capture and generates the audio signal by the capture, the playback reservation time is calculated from the capture time at which the capture was performed using the following equation (5).
　再生予約時間　＝　（キャプチャ時刻　－　ＰＣ基準時刻）　＋　バッファリング時間・・・式（５）
　式（５）に示すように、制御部４１は、ＰＣ基準時刻からの相対時間として再生予約時間を算出する。 Playback reservation time = (Capture time-PC reference time) + Buffering time (5)
As shown in Expression (5), the control unit 41 calculates a playback reservation time as a relative time from the PC reference time.
　再生予約時間を算出すると、制御部４１は、各プロジェクター１２に出力する音声信号に算出した再生予約時間を示す時間情報を付加して各プロジェクター１２に出力する。図８においては、制御部４１は、時刻ｔ８３において、音声信号ＤＲ（０）をプロジェクター１２－１に出力し、音声信号ＤＲ（０）の出力後、音声信号ＤＬ（０）をプロジェクター１２－２に出力したものとする。 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.
　各プロジェクター１２に時間情報が付加された音声信号が入力されると、各プロジェクター１２の制御部５５は、受信完了信号を制御装置１１に出力させる。また、制御部５５は、以下の式（６）を用いて、音声信号の再生時刻を算出し、算出した再生時刻まで音声信号をバッファリングする。 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.
　再生時刻　＝　ＰＪ基準時刻　＋　再生予約時間・・・式（６）
　制御部５５は、時刻ｔ８４において、システムカウンタのカウント値により、ＰＪ基準時刻から再生予約時間が経過し、再生時刻になったことを確認すると、音声信号を再生キューに入力し、音声出力部５３に順次、再生させる。したがって、プロジェクター１２－１は、音声信号ＤＲ（０）から順次再生し、プロジェクター１２－２は、音声信号ＤＬ（０）から順次再生する。上述したように、プロジェクター１２－１，１２－２は同期しているので、音声信号ＤＲ（０）および音声信号ＤＬ（０）の再生タイミングが一致し、音声をステレオ出力することが可能となる。 Playback time = PJ reference time + Playback reservation time ... Equation (6)
When the control unit 55 confirms that the playback reservation time has elapsed from the PJ reference time and has reached the playback time based on the count value of the system counter at time t84, the control unit 55 inputs the audio signal to the playback queue, and outputs the audio output unit 53. To play sequentially. Therefore, the projector 12-1 sequentially reproduces from the audio signal DR (0), and the projector 12-2 sequentially reproduces from the audio signal DL (0). As described above, since the projectors 12-1 and 12-2 are synchronized, the reproduction timings of the audio signal DR (0) and the audio signal DL (0) match, and the audio can be output in stereo. .
　制御部５５は、再生時刻を過ぎて音声信号が入力されると、そのまま再生キューに入力し、順次再生させる。 When the audio signal is input past the reproduction time, the control unit 55 inputs the audio signal as it is to the reproduction queue and sequentially reproduces it.
　ここで、ＰＣ基準時刻とＰＪ基準時刻との関係について説明する。本実施の形態では、ＰＣ基準時刻は、式（３）を用いることにより、ＰＪ基準時刻よりも前の時刻に設定される。つまり、ＲＴＴは、音声信号が出力されてから受信完了信号が入力されるまでの時間に相当しているので、通知信号の入力時刻からＲＴＴの時間を減算した時刻は、ＰＪ基準時刻よりも、音声信号が制御装置１１から出力されてプロジェクター１２に入力されるまでの時間と略同じ時間、前の時刻になる。上述のように、ＰＣ基準時刻をＰＪ基準時刻よりも前の時刻に設定することにより、音声信号が制御装置１１から出力されてプロジェクター１２に入力されるまでの送信にかかる時間に対応して動作することが可能となり、プロジェクター１２は、所定の音声信号を再生予約時間内に受信することが可能となる。例えば、式（４）において、バッファリング時間とキャプチャ間隔が略等しい時間で設定された場合も、正常に音声を再生することが可能となる。なお、バッファリング時間を十分に確保することができる場合は、制御装置１１からプロジェクター１２への送信時間と、プロジェクター１２から制御装置１１への送信時間とが、略等しい時間として、式（３）において、（ＲＴＴの平均値）の代わりに（ＲＴＴの平均値）に（１／２）を乗算した値を用いて、ＰＣ基準時刻とＰＪ基準時刻とが略同じ時刻として設定されても良い。 Here, the relationship between the PC reference time and the PJ reference time will be described. In the present embodiment, 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. Thus, the projector 12 can receive a predetermined audio signal within the reserved playback time. For example, in the formula (4), even when the buffering time and the capture interval are set to be approximately equal, it is possible to reproduce the sound normally. When a sufficient buffering time can be secured, 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) In this case, 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).
　このように本実施形態によれば、プロジェクター１２は、リモートコントローラ１３から送信された同報信号を受信し、同報信号を受信した時刻を基準時刻とする。また、制御装置１１は、各プロジェクター１２との間の信号の伝送状態に基づいて、音声信号をバッファする所定の時間を算出し、その所定の時間を示す時間情報を付加した音声信号を各プロジェクター１２に出力する。また、各プロジェクター１２は、時間情報が付加された音声信号が入力されると、システムカウンタ５４のカウント値により、基準時刻から時間情報に示される所定の時間が経過したことが確認されると、音声信号を再生する。 Thus, according to the present embodiment, 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. In addition, 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. In addition, when 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.
　同報信号の受信時刻を基準時刻とすることで、ＲＴＣ回路などを用いることなく、プロジェクター１２－１，１２－２を同期させることができる。また、基準時刻から所定の時間が経過した後に音声信号を再生することで、各プロジェクター１２とのネットワーク経路の違いや通信ジッタの影響を受けることなく、各プロジェクター１２の音声の再生タイミングを同期させることができる。 By using the broadcast signal reception time as the reference time, 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.
　なお、本実施形態においては、プロジェクター１２の数が２つであり、右チャンネル用および左チャンネル用の音声信号のそれぞれに対応して、プロジェクター１２－１，１２－２を設け、対応するチャンネルの音声信号を各プロジェクターにより再生する例を用いて説明したが、これに限られるものではない。３以上のチャンネルの音声信号について、３以上のプロジェクターを各チャンネルの音声信号に対応させて設け、各プロジェクター１２は、対応するチャンネルの音声信号のみを再生するようにしてもよい。こうすることで、より多チャンネルの音声信号をサラウンド出力することができる。 In the present embodiment, 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. Although an example in which an audio signal is reproduced by each projector has been described, the present invention is not limited to this. Regarding 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.
　また、上述した実施形態においては、制御装置１１が、右チャンネル用および左チャンネル用に音声信号を分離する例を用いて説明したが、これに限られるものではない。制御装置１１は、複数チャンネルの音声信号を各プロジェクター１２に出力し、各プロジェクター１２は、において、自装置に対応するチャンネルの音声信号を分離して再生するようにしてもよい。 In the above-described embodiment, the control device 11 is described using an example in which the audio signal is separated for the right channel and the left channel. However, the present invention is not limited to this. 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.
　また、上述した実施形態においては、制御装置１１が音声信号を各プロジェクター１２に出力し、また、各プロジェクター１２がその音声信号に対する受信完了信号を制御装置１１に出力することで、通信ジッタおよびＲＴＴを計測する例を用いて説明したが、これに限られるものではない。例えば、制御装置１１に通知信号が入力され、キャプチャが一時停止されている間に、所定の信号を入出力することで、通信ジッタおよびＲＴＴを計測するようにしてもよい。 In the embodiment described above, the 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. However, the present invention is not limited to this. For example, 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.
　以上、実施形態を参照して本願発明を説明したが、本発明は上記実施形態に限定されるものではない。本願発明の構成や詳細には、本願発明の範囲内で当業者が理解し得る様々な変更をすることができる。 As mentioned above, although this invention was demonstrated with reference to embodiment, this invention is not limited to the said embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

Claims (10)

  1. 　複数の音声出力装置と、前記複数の音声出力装置に音声信号を出力する制御装置と、前記複数の音声出力装置に同報信号を送信する送信装置と、を備え、
    　前記送信装置は、
    　所定の操作入力に応じて前記同報信号を送信し、
    　前記制御装置は、
    　前記音声信号の再生を要求する旨が入力されると、前記音声信号を前記複数の音声出力装置の各々に出力する第１の制御部を有し、
    　前記複数の音声出力装置の各々は、
    　カウント値を出力するカウンタと、
    　前記同報信号を受信する受信部と、
    　前記音声信号を再生する音声出力部と、
    　前記受信部が前記同報信号を受信すると、前記同報信号を受信したことを示す通知信号を前記制御装置へ出力する第２の制御部と、を有し、
    　前記第１の制御部は、前記通知信号が入力されると、所定の時間を示す時間情報を前記音声信号に付加し、
    　前記第２の制御部は、前記時間情報が付加された音声信号が入力されると、前記カウンタのカウント値により、前記同報信号の受信時から前記時間情報に示される時間が経過したことが確認されると、前記音声信号を前記音声出力部に再生させることを特徴とする音声再生システム。     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 receiver for receiving the broadcast signal;
    An audio output unit for reproducing the audio signal;
    A second control unit that outputs a notification signal indicating that the broadcast signal has been received to the control device when the receiving unit receives the broadcast signal;
    When the notification signal is input, the first control unit adds time information indicating a predetermined time to the audio signal,
    When the audio signal to which the time information is added is input, the second control unit indicates that the time indicated in the time information has elapsed from the time of reception of the broadcast signal according to the count value of the counter. If confirmed, the audio output system causes the audio output unit to reproduce the audio signal.
  2. 　請求項１記載の音声再生システムにおいて、
    　前記第１の制御部は、前記複数の音声出力装置の各々について、該音声出力装置との間の信号の伝送状態を計測し、該計測した前記複数の音声出力装置の各々との間の信号の伝送状態に基づいて前記所定の時間を決定することを特徴とする音声再生システム。     The sound reproduction system according to claim 1, wherein
    The first control unit measures a signal transmission state between each of the plurality of sound output devices and the sound output device, and signals between the measured sound output devices. The audio reproduction system characterized in that the predetermined time is determined based on the transmission state of the video.
  3. 　請求項１または２記載の音声再生システムにおいて、
    　前記第１の制御部は、前記複数の音声出力装置の各々に異なるチャンネルの音声信号を出力することを特徴とする音声再生システム。     The sound reproduction system according to claim 1 or 2,
    The first control unit outputs an audio signal of a different channel to each of the plurality of audio output devices.
  4. 　請求項１または２記載の音声再生システムにおいて、
    　前記複数の音声出力装置の各々は、複数のチャンネルのなかのいずれかのチャンネルに対応して設けられ、
    　前記第１の制御部は、前記複数のチャンネルの音声信号を前記複数の音声出力装置の各々に出力し、
    　前記第２の制御部は、入力された前記複数のチャンネルの音声信号のなかの、対応するチャンネルの音声信号のみを前記音声出力部に再生させることを特徴とする音声再生システム。     The sound reproduction system according to claim 1 or 2,
    Each of the plurality of audio output devices is provided corresponding to any one of a plurality of channels,
    The first control unit outputs audio signals of the plurality of channels to each of the plurality of audio output devices,
    The second control unit causes the audio output unit to reproduce only the audio signal of the corresponding channel among the input audio signals of the plurality of channels.
  5. 　制御装置から出力された音声信号を再生する音声出力装置であって、
    　カウント値を出力するカウンタと、
    　外部から送信されてきた同報信号を受信する受信部と、
    　前記音声信号を再生する音声出力部と、
    　前記受信部が前記同報信号を受信するとともに、所定の時間を示す時間情報が付加された音声信号が入力されると、前記カウンタのカウント値により、前記同報信号の受信時から前記時間情報に示される時間が経過したことが確認されると、前記音声信号を前記音声出力部に再生させる制御部と、を有することを特徴とする音声出力装置。     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 control unit that causes the audio output unit to reproduce the audio signal when it is confirmed that the time indicated by elapses.
  6. 　請求項５記載の音声出力装置であって、
    　前記複数の音声出力装置の各々は、複数のチャンネルのなかのいずれかのチャンネルに対応して設けられ、
    　前記制御部は、前記複数のチャンネルの音声信号が入力されると、前記複数のチャンネルの音声信号のなかの、対応するチャンネルの音声信号のみを前記音声出力部に再生させることを特徴とする音声出力装置。     The audio output device according to claim 5,
    Each of the plurality of audio output devices is provided corresponding to any one of a plurality of channels,
    When the audio signals of the plurality of channels are input, the control unit causes the audio output unit to reproduce only the audio signal of the corresponding channel among the audio signals of the plurality of channels. Output device.
  7. 　複数の音声出力装置に音声信号を出力する制御装置であって、
    　前記音声信号に該音声信号をバッファする所定の時間を示す時間情報を付加して前記複数の音声出力装置の各々へ出力する制御部を有することを特徴とする制御装置。     A control device that outputs audio signals to a plurality of audio output devices,
    A control apparatus comprising: 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 apparatuses.
  8. 　請求項７記載の制御装置であって、
    　前記制御部は、前記複数の音声出力装置の各々について、該音声出力装置との間の信号の伝送状態を計測し、該計測した前記複数の音声出力装置の各々との間の信号の伝送状態とに基づいて前記所定の時間を決定することを特徴とする制御装置。     The control device according to claim 7,
    The control unit measures, for each of the plurality of sound output devices, a signal transmission state with the sound output device, and measures the signal transmission state with each of the plurality of sound output devices. And determining the predetermined time based on:
  9. 　請求項７または８記載の制御装置であって、
    　前記制御部は、前記複数の音声出力装置の各々に異なるチャンネルの音声信号を出力することを特徴とする制御装置。     The control device according to claim 7 or 8, comprising:
    The control unit outputs a sound signal of a different channel to each of the plurality of sound output devices.
  10. 　それぞれがカウント値を出力するカウンタを有する複数の音声出力装置と、前記複数の音声出力装置に音声信号を出力する制御装置と、前記複数の音声出力装置に同報信号を送信する送信装置と、を備える音声再生システムにおける音声再生方法であって、
    　前記通信装置が、所定の操作入力に応じて、同報信号を前記複数の音声出力装置に送信する送信ステップと、
    　前記制御装置が、前記音声信号の再生を要求する旨が入力されると、前記音声信号を前記複数の音声出力装置の各々へ出力する出力ステップと、
    　前記複数の音声出力装置の各々が、前記同報信号を受信すると、前記同報信号を受信したことを示す通知信号を前記制御装置へ出力する通知ステップと、
    　前記複数の音声出力装置の各々が、前記音声信号が入力されると、該音声信号を再生する再生ステップと、を有し、
    　前記制御装置は、前記出力ステップでは、前記通知信号が入力されると、前記音声信号に所定の時間を示す時間情報を付加して前記複数の音声出力装置の各々へ出力し、
    　前記複数の音声出力装置の各々は、前記再生ステップでは、前記時間情報が付加された音声信号が入力されると、前記カウンタのカウント値により、前記同報信号の受信時から前記時間情報に示される時間が経過したことが確認されると、前記音声信号を再生することを特徴とする音声再生方法。     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; 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 and outputs the audio signal to each of the plurality of audio output devices,
    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. The audio reproduction method is characterized in that the audio signal is reproduced when it is confirmed that a predetermined time has elapsed.
PCT/JP2013/061637 2013-04-19 2013-04-19 Audio reproduction system, audio output device, control device, and audio reproduction method WO2014171010A1 (en)

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