WO2012017573A1 - Système d'émission/réception, dispositif d'émission et dispositif de réception - Google Patents

Système d'émission/réception, dispositif d'émission et dispositif de réception Download PDF

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Publication number
WO2012017573A1
WO2012017573A1 PCT/JP2011/001266 JP2011001266W WO2012017573A1 WO 2012017573 A1 WO2012017573 A1 WO 2012017573A1 JP 2011001266 W JP2011001266 W JP 2011001266W WO 2012017573 A1 WO2012017573 A1 WO 2012017573A1
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WIPO (PCT)
Prior art keywords
audio
clock
transmission
information
audio clock
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PCT/JP2011/001266
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English (en)
Japanese (ja)
Inventor
加藤秀司
柳澤玲互
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パナソニック株式会社
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Publication of WO2012017573A1 publication Critical patent/WO2012017573A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
    • H04N21/43632—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wired protocol, e.g. IEEE 1394
    • H04N21/43635—HDMI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/81—Monomedia components thereof
    • H04N21/8106—Monomedia components thereof involving special audio data, e.g. different tracks for different languages

Definitions

  • the present invention relates to a transmission / reception system used for high-speed transmission of video data and audio data.
  • HDMI High-Definition Multimedia Interface
  • M and N for connecting a pixel clock synchronized with video data and an audio clock are obtained, and the frequency division parameters M and N are transmitted in place of the audio clock.
  • FIG. 4 is a block diagram showing a configuration example of a conventional transmission / reception system.
  • a transmission device 401 and a reception device 402 are connected to each other via a transmission line that conforms to the HDMI standard.
  • the transmission device 401 multiplexes audio data with video data and transmits the multiplexed audio data to the reception device 402.
  • Examples of the transmission device 401 include a DVD player and a BD (Blue-ray Disc) recorder
  • examples of the reception device 402 include a plasma television and a liquid crystal television.
  • FIG. 5 is a diagram for explaining the relationship between the audio clock and pixel clock and the frequency division parameters M and N.
  • the frequency f of the audio clock is often set to an integer multiple of the sampling frequency fs when digitizing the audio signal that was originally an analog signal.
  • the frequency division parameter N is a parameter for dividing the audio clock
  • the frequency division parameter M is a parameter for dividing the pixel clock.
  • pclk / M f / N
  • the audio clock is divided by N by the frequency divider 102, and the counter 103 counts it by the pixel clock to obtain M.
  • the frequency division parameters M and N thus obtained are packetized by the video / audio / packet multiplexing unit 104 and multiplexed during the blanking period of the video data.
  • the video / audio / packet multiplexing unit 104 packetizes the audio data in the same manner and multiplexes it during the blanking period of the video data.
  • the video / audio / packet multiplexed data and the pixel clock output from the transmission device 401 are transmitted via a transmission path and received by the reception device 402.
  • the video / audio / packet separating unit 114 separates and outputs the video data and the pixel clock.
  • the video data is synchronized with the pixel clock, and is generally displayed on a plasma panel or a liquid crystal panel after image processing for improving image quality is performed later.
  • the video / audio / packet separation unit 114 separates and outputs the frequency division parameters M and N.
  • f (pclk / M) ⁇ N Therefore, if the pixel clock is divided by M by the frequency divider 112 and the output of the frequency divider 112 is multiplied by N by the multiplier 113, the audio clock having the frequency f can be reproduced.
  • the audio clock is transmitted using the frequency division parameters M and N.
  • the audio clock reproduced by the receiving apparatus 402 includes jitter due to jitter superimposed on the pixel clock on the transmission path. For this reason, sound quality will deteriorate rather than the time of transmission.
  • Patent Document 1 discloses a configuration for transmitting audio data with higher sound quality.
  • FIG. 6 shows a configuration disclosed in Patent Document 1.
  • the configuration of FIG. 6 is different from FIG. 4 in that the receiving device 602 side has an audio clock reference.
  • the transmission device 601 transmits the frequency division parameter N to the reception device 602.
  • the frequency divider 221 divides the master clock by N
  • the period counter 222 counts the output of the frequency divider 221 with the received pixel clock.
  • the count value M is transmitted from the receiving apparatus 602 to the transmitting apparatus 601 using, for example, CEC (Consumer Electronics Control).
  • CEC is a protocol for transmitting and receiving device control signals such as commands according to remote control operations, for example. In the HDMI standard, mutual communication by CEC is defined as an option.
  • the frequency divider 223 divides the video clock by M, and the multiplier 224 multiplies the output of the frequency divider 223 by N.
  • an audio clock having the same frequency as the master clock can be reproduced.
  • the transmission device 601 transmits audio data synchronized with the reproduced audio clock.
  • the receiving device 602 receives audio data and reproduces audio using a high-precision master clock. As a result, high sound quality can be achieved.
  • sampling frequencies are used for audio signals. For example, 44.1 kHz is used in a compact disc (CD), but 48 kHz is used in digital broadcasting. In order to achieve higher sound quality, integers such as 176.4 kHz and 192 kHz are used. In recent years, since recording on a medium such as a CD-R can be easily performed by a personal computer or the like, a plurality of contents having different sampling frequencies may be recorded on one medium. When reproducing such media, the sampling frequency of the audio signal changes every time the content changes. That is, the sampling frequency changes frequently.
  • the sampling frequency when the sampling frequency is switched, information on the sampling frequency is transmitted from the transmission device 601 to the reception device 602, for example, in packets.
  • the receiving device 602 reads the sampling frequency from the received packet and switches the audio clock to one corresponding to this sampling frequency. Thereafter, M is obtained by the operation of the frequency divider 221 and the period counter 213 and transmitted to the transmission device 601. Then, a new audio clock is reproduced by the frequency divider 223 and the multiplier 224 in the transmission device 601.
  • the sampling frequency when the sampling frequency is switched, it takes a long time from the start of switching until the audio clock is reproduced in the transmission apparatus 601.
  • the multiplier 224 since the multiplier 224 has a PLL (Phase Locked Loop) configuration, it takes a long time to lock. This leads to a problem that sound is not output for a short time immediately after the content is switched, and sound is cut off.
  • PLL Phase Locked Loop
  • the present invention enables transmission of audio data with high sound quality and no interruption of sound when switching contents in a transmission / reception system in a digital interface for video / audio transmission. With the goal.
  • One aspect of the present invention is a transmission / reception system including a transmission device and a reception device in a digital interface for video / audio transmission.
  • the reception device receives transmission data output from the transmission device, and receives the transmission data from the transmission data.
  • Based on the received video data, the received video clock, the received audio data, the video / audio / packet separating unit that separates the sampling frequency information of the received audio data, and the reference clock given from the outside Generate a plurality of audio clocks, and select and output one audio clock as a reception audio clock from the plurality of audio clocks according to the sampling frequency information of the received audio data.
  • reception audio clock output from the reception audio clock generation unit At least information on the frequency of the first audio clock is received from a reception audio processing unit that outputs reception audio data and a first audio clock that is one of a plurality of audio clocks generated by the reception audio clock generation unit.
  • An audio clock information generating unit that generates audio clock information including the audio clock information and outputs the audio clock information to the transmission device.
  • the transmission device receives the audio clock information output from the reception device, and receives the audio clock information. And generating a plurality of audio clocks having different frequencies based on the second audio clock, and generating a plurality of audio clocks based on the second audio clock.
  • one audio clock is selected and output as the transmission audio clock
  • the transmission audio clock generation unit, the transmission audio data synchronized with the transmission audio clock, and the sampling frequency information of the transmission audio data are packetized and superimposed on the blanking period of the transmission video data synchronized with the transmission video clock.
  • a video / audio / packet multiplexing unit for generating the transmission data for generating the transmission data.
  • the reception audio clock generation unit generates a plurality of audio clocks having different frequencies based on a reference clock given from outside.
  • the audio clock information generation unit generates audio clock information including frequency information of the first audio clock that is one of the plurality of audio clocks, and outputs the audio clock information to the transmission device.
  • the audio clock reproduction unit reproduces a second audio clock having a frequency indicated by the audio clock information output from the reception device.
  • the transmission audio clock generation unit generates a plurality of audio clocks having different frequencies based on the second audio clock. That is, a plurality of audio clocks having different frequencies are prepared in advance in the receiving device and the transmitting device.
  • the transmission audio clock generation unit in the transmission device selects a transmission audio clock from a plurality of audio clocks according to the sampling frequency information of the transmission audio data, and the reception audio clock generation unit in the reception device transmits A reception audio clock is selected from a plurality of audio clocks according to the sampling frequency information of the reception audio data separated from the data.
  • the new transmission audio clock and reception audio clock can be used quickly in the transmission device and the reception device. Therefore, sound interruption does not occur when switching contents.
  • the reception audio clock is generated based on a reference clock given from the outside, the accuracy is high, so that the sound quality of the audio signal to be reproduced is not deteriorated.
  • audio clock information including at least frequency information of a first audio clock output from a reception device is received and the audio is transmitted.
  • An audio clock reproduction unit that reproduces a second audio clock having a frequency indicated by the clock information, and a plurality of audio clocks having different frequencies based on the second audio clock are generated.
  • a transmission audio clock generation unit that selects and outputs one audio clock as the transmission audio clock, the transmission audio data synchronized with the transmission audio clock, and the sampling frequency Packet of information and blanking of transmission video data synchronized with the transmission video clock By superimposing the grayed period, in which a video-audio packet multiplexing unit for generating transmission data.
  • the transmission data output from the transmitting device is received, and from this transmission data, the received video data, the received video clock, Based on a video / audio / packet separating unit that separates received audio data and sampling frequency information of the received audio data, and a reference clock given from the outside, a plurality of audio clocks having different frequencies are generated, A reception audio clock generation unit that selects and outputs one audio clock as a reception audio clock from the plurality of audio clocks according to the sampling frequency information, and a reception audio clock output from the reception audio clock generation unit In synchronization with the received voice processing unit for outputting the received voice data, and the received voice clock The audio that is generated from the first audio clock that is one of the plurality of audio clocks generated by the audio generator, and that includes the audio clock information including at least the frequency information of the first audio clock, and that is output to the transmitter And a clock information generation unit.
  • deterioration in sound quality of an audio signal reproduced on the receiving device side is suppressed, and a new transmission audio clock and reception audio clock can be quickly used even when the sampling frequency is changed.
  • FIG. 2 is a block diagram illustrating a configuration example in which the configuration of FIG. 1 is embodied. It is a block diagram which shows the other structural example which actualized the structure of FIG. It is a block diagram which shows the structural example of the conventional transmission / reception system. It is a figure which shows the relationship between an audio
  • the transmission / reception system shown in the present embodiment it is assumed that a transmission device and a reception device are connected to each other via a transmission line that conforms to the HDMI standard.
  • the application range of the present invention is not limited to HDMI as a digital interface for video / audio transmission, but can be applied to other digital interfaces.
  • FIG. 1 is a block diagram showing a configuration of a transmission / reception system according to the embodiment.
  • 1 includes a frequency divider 102, a counter 103, a video / audio / packet multiplexing unit 104, an audio clock reproduction unit 105, and a transmission audio clock generation unit 106.
  • the transmission audio clock generation unit 106 includes a frequency divider / multiplier 107 and a selector 108.
  • the reception device 111 includes a frequency divider 112, a multiplier 113, a video / audio / packet separation unit 114, an audio clock information generation unit 115, a reception audio clock generation unit 116, and a buffer 119.
  • the reception audio clock generation unit 116 includes a frequency divider / multiplier 117 and a selector 118.
  • a high-accuracy reference clock RCLK is input to the receiving device 111 from the outside.
  • the reception audio clock generation unit 116 generates a plurality of audio clocks having different frequencies from each other based on the reference clock RCLK given from the outside. For example, as shown in FIG. 1, two audio clocks are generated: an audio clock RAC1 having a frequency of 128fs1 which is 128 times the sampling frequency fs1, and an audio clock RAC2 having a frequency of 128fs2 which is 128 times the sampling frequency fs2. Is done.
  • Such an audio clock is obtained, for example, by dividing or multiplying the reference clock RCLK by the frequency divider / multiplier 117.
  • the frequency divider / multiplier 117 here is not necessarily required to have both functions of frequency division and multiplication. Depending on the frequency relationship between the reference clock RCLK and a plurality of generated audio clocks, the frequency divider / multiplier 117 may have only a frequency dividing function or only a frequency multiplying function. It may be sufficient if it has.
  • the audio clock information generation unit 115 includes, from the first audio clock that is one of the plurality of audio clocks generated by the reception audio clock generation unit 116, audio clock information including at least information on the frequency of the first audio clock.
  • An IAC is generated and output to the transmission apparatus 101.
  • the audio clock information IAC including information of the frequency 128 fs1 is generated from the audio clock RAC1 as the first audio clock.
  • the audio clock reproducing unit 105 receives the audio clock information IAC output from the receiving apparatus 111, and reproduces the second audio clock having the frequency indicated by the audio clock information IAC.
  • the audio clock reproduction unit 105 reproduces the audio clock TAC1 as the second audio clock having the frequency 128fs1 indicated by the audio clock information IAC.
  • the transmission audio clock generation unit 106 generates a plurality of audio clocks having different frequencies, including the second audio clock, based on the second audio clock reproduced by the audio clock reproduction unit 105. For example, in the configuration of FIG. 1, the transmission audio clock generation unit 106 divides the audio clock TAC1 by fs1 by the frequency divider / multiplier 107 based on the audio clock TAC1, and multiplies it by fs2 to thereby generate audio having a frequency of 128 fs2. A clock TAC2 is generated.
  • the plurality of audio clocks generated by the reception audio clock generation unit 116 of the reception device 111 and the plurality of audio clocks generated by the transmission audio clock generation unit 106 of the transmission device 101 have the same frequency breakdown. It is preferable.
  • the frequency relationship between the first audio clock RAC1 to which the frequency information is transmitted by the audio clock information IAC and the plurality of audio clocks generated in the reception audio clock generation unit 116 is reproduced from the audio clock information IAC.
  • the frequency relationship between the second audio clock TAC1 and the plurality of audio clocks generated by the transmission audio clock generation unit 106 is preferably the same.
  • the transmission audio clock generation unit 106 selects and outputs one audio clock as the transmission audio clock TAC from the plurality of audio clocks TAC1 and TAC2 according to the sampling frequency information of the audio data to be transmitted. To do. Specifically, the selector 108 selects one of the audio clocks TAC1 and TAC2 as the transmission audio clock TAC (frequency 128 fs) according to the information indicating the sampling frequency fs. In HDMI, information indicating the sampling frequency fs is stored in the data structure of audio data. Alternatively, the sampling frequency information can also be obtained from the frequency division parameters M and N.
  • the audio data is input to the video / audio / packet multiplexing unit 104 in synchronization with the transmission audio clock TAC output from the transmission audio clock generation unit 106.
  • the frequency divider 102 and the counter 103 generate frequency division parameters M and N from the transmission audio clock TAC and the pixel clock (video clock) PCLK, and send them to the video / audio / packet multiplexing unit 104.
  • the video / audio / packet multiplexing unit 104 generates transmission data by packetizing transmission audio data synchronized with the transmission audio clock TAC and superimposing the packet on a blanking period of video data synchronized with the pixel clock PCLK. . At this time, sampling frequency information and frequency division parameters M and N are also packetized and transmitted.
  • the video / audio / packet separation unit 114 receives the transmission data output from the transmission device 101, and separates the video data, the pixel clock, and the audio data from the transmission data. Also, sampling frequency information and frequency division parameters M and N are separated. The frequency divider 112 and the multiplier 113 regenerate the audio clock RAC 'from the divided frequency division parameters M and N. The received audio data is temporarily stored in a buffer 119 as a reception audio processing unit in synchronization with the reproduced audio clock RAC '.
  • the reception audio clock generation unit 116 selects and outputs one audio clock as the reception audio clock RAC from the plurality of audio clocks RAC1 and RAC2 according to the sampling frequency information of the received audio data. Specifically, the selector 118 selects one of the audio clocks RAC1 and RAC2 as the transmission audio clock RAC (frequency 128 fs) according to the information indicating the sampling frequency fs. Since the selected reception audio clock RAC is a high-accuracy clock based on the reference clock RCLK, by using this as a read clock for the buffer 119, audio data synchronized with the high-accuracy reception audio clock RAC is received. Output from the device 111.
  • a plurality of audio clocks RAC1 and RAC2 based on the reference clock RCLK are prepared in advance in the reception device 111, and also in the transmission device 101 that has received the audio clock information IAC from the reception device 111.
  • a plurality of audio clocks TAC1 and TAC2 are prepared in advance.
  • the transmission audio clock generation unit 106 selects the transmission audio clock TAC from the plurality of audio clocks according to the sampling frequency information of the transmission audio data, and in the reception device 111, the reception audio clock generation.
  • the unit 116 selects the reception audio clock RAC from the plurality of audio clocks according to the sampling frequency information of the reception audio data separated from the transmission data.
  • the new transmission audio clock TAC and the reception audio clock RAC can be quickly used in the transmission device 101 and the reception device 111. Therefore, sound interruption does not occur when switching contents. Further, since the reception audio clock RAC is generated based on the reference clock RCLK given from the outside, the accuracy is high, so that the sound quality of the reproduced audio signal is not deteriorated.
  • the frequency division parameters M and N are transmitted / received.
  • the frequency division parameters M and N are not necessarily transmitted / received. This is because the audio data received by the reception device 111 is synchronized with a plurality of audio clocks generated by the reception audio clock generation unit 116, and therefore it is not necessary to reproduce the reception audio clock from the frequency division parameters M and N. .
  • the received audio data may be written in the buffer 119 in synchronization with the pixel clock PCLK.
  • the reception audio clock RAC output from the reception audio clock generation unit 116 is used to read out the reception audio data from the buffer 119.
  • the frequency divider 112 and the multiplier 113 are not required in the reception device 111.
  • FIG. 2 is a block diagram showing a configuration example in which the configuration of FIG. 1 is further embodied. 2, the same reference numerals are given to the same components as those in FIG. 1, and detailed description thereof is omitted here.
  • the transmission device 201 includes an optical digital audio reception unit 202 as an example of the audio clock reproduction unit 105, and the reception device 211 includes an optical digital audio transmission unit 212 as an example of the audio clock information generation unit 115. It has.
  • the transmission audio clock generation unit 106 of the transmission device 201 includes a frequency divider / multiplier 203 that divides the input clock signal by 480 and multiplies it by 441 as an example of the frequency divider / multiplier 107.
  • the reception audio clock generation unit 211 of 211 divides the input clock signal by 441 and multiplies it by 128, and the frequency divider / multiplier 213 divides the input clock signal by 480. And a frequency divider / multiplier 214 for multiplying by 128.
  • the frequency divider / multiplier 213 divides the reference clock RCLK by 441 and multiplies it by 128 to generate the audio clock RAC1
  • the frequency divider / multiplier 214 divides the reference clock RCLK by 480 and multiplies it by 128.
  • the audio clock RAC2 is generated.
  • the optical digital audio transmission unit 212 and the optical digital audio reception unit 202 constitute a digital audio interface.
  • a digital audio interface for example, the IEC60958 standard is widely used as an international standard.
  • an audio signal is biphase-modulated and transmitted in units called frames.
  • a synchronization pattern called a preamble is embedded at the head of each frame.
  • the audio clock information IAC is transmitted from the receiving device 211 to the transmitting device 201 using the digital audio interface as described above.
  • the optical digital audio transmission unit 212 receives the audio clock RAC1 as the first audio clock from the reception audio clock generation unit 116. Then, a predetermined audio signal is bi-phase modulated in synchronization with the audio clock RAC1. Thereby, audio information in which a preamble is embedded in the same cycle as the audio clock RAC1 is generated. Further, the optical digital audio transmission unit 212 performs photoelectric conversion on the generated audio information and outputs the light.
  • the frequency divider / multiplier 203 generates the audio clock TAC2 by dividing the audio clock TAC1 by 480 and multiplying it by 441.
  • the video / audio data transmission operation is the same as that shown in FIG.
  • the audio information sent from the receiving apparatus 211 to the transmitting apparatus 201 may be any information that can transmit the frequency information of the audio clock RAC1 and can reproduce the audio clock TAC1 in the optical digital audio receiving unit 202. Therefore, the audio information generated by the optical digital audio transmission unit 212 does not need to include a normal audio signal. That is, for example, the optical digital audio transmission unit 212 may perform modulation using a non-audio signal (constant value) or an audio signal with a predetermined period (for example, a sine wave) as the predetermined audio signal. However, if a normal audio signal is used, the transmission of the audio signal and the transmission of audio clock information can be combined.
  • audio information is optically transmitted from the reception device 211 to the transmission device 201.
  • transmission of audio information is not limited to optical transmission.
  • a coaxial cable may be used.
  • a signal line may be provided in the HDMI cable, and transmission may be performed using the signal line.
  • it is preferable to use an existing audio interface because the cost increase can be minimized.
  • the audio information conforming to the IEC 60958 standard as an example of the digital audio interface standard is transmitted.
  • the format of the audio information to be transmitted is not limited to this.
  • any audio signal may be used as long as it is modulated in units of frames in which a synchronization pattern is embedded and can transmit frequency information according to the period of the synchronization pattern.
  • FIG. 3 is a block diagram showing another configuration example that further embodies the configuration of FIG. 3, the same reference numerals are given to the same components as those in FIGS. 1 and 2, and the detailed description thereof is omitted here.
  • the transmission device 301 includes a frequency division parameter reception unit 302 as an example of the audio clock reproduction unit 105
  • the reception device 311 includes a frequency division parameter transmission unit 312 as an example of the audio clock information generation unit 115. It has.
  • the reception audio clock generation unit 116 generates an audio clock RAC1 having a frequency of 128 fs1 and an audio clock RAC2 having a frequency of 128 fs2 based on the reference clock RCLK, as in the configuration of FIG.
  • the frequency division parameter transmission unit 312 generates frequency division parameters P and Q as audio clock information from the audio clock RAC1 output from the reception audio clock generation unit 116 and the pixel clock PCLK.
  • the frequency division parameters P and Q have the following relationship, and are generated by the same method as the frequency division parameters M and N.
  • PCLK / P 128fs1 / Q
  • the frequency division parameter transmission unit 312 transmits both or one of the frequency division parameters P and Q. For example, when a specified eigenvalue is used for Q, it is not necessary to transmit Q, and only P may be transmitted.
  • CEC which is an option of the HDMI standard, may be used.
  • the frequency division parameter receiving unit 302 reproduces the audio clock TAC1 from the frequency division parameter (both or one of P and Q) received from the reception device 311 and the pixel clock PCLK. For example, when Q is a predetermined fixed value, only P is received, and the audio clock TAC1 having a frequency of 128 fs1 is reproduced from the pixel clocks PCLK and P and the predetermined fixed value Q.
  • the method of reproducing the audio clock here is the same as the method of reproducing the audio clock from the frequency division parameters M and N.
  • the transmission audio clock generation unit 106 generates an audio clock TAC2 having a frequency of 128 fs2 based on the audio clock TAC1 reproduced by the frequency division parameter reception unit 302.
  • the video / audio data transmission operation is the same as that shown in FIG.
  • the CEC is used for transmission of the frequency division parameters P and Q.
  • Ethernet registered trademark
  • a wireless LAN may be used.
  • the timing for transmitting the frequency division parameters P and Q is preferably matched with the period determined by 128 fs1 / Q.
  • the frequency deviation between the audio clock TAC1 output from the frequency division parameter receiving unit 302 in the transmission device 301 and the audio clock RAC1 output from the reception audio clock generation unit 116 in the reception device 311 transmits the frequency division parameters P and Q.
  • This problem may be dealt with by increasing the capacity of the buffer 119.
  • the capacity required for the buffer 119 is such that it corresponds to the amount of audio data received during the time interval for transmitting the frequency division parameters P and Q.
  • the frequency division parameter receiving unit 302 may regenerate a plurality of audio clocks corresponding to the sampling frequency from each set of frequency division parameters P and Q.
  • the present invention it is possible to transmit audio data with high sound quality and no interruption of sound when switching contents in a digital interface such as HDMI. It is effective for improving data quality.
  • Audio clock generation unit 1111, 211, 311 Reception device 114 Video / audio / packet separation unit 115 Audio clock information generation unit 116 Reception audio Clock generator 119 Buffer (Received audio processor) 202 Optical digital audio receiver (audio clock recovery unit) 212 Optical digital audio transmitter (audio clock information generator) 302 Frequency division parameter receiver (audio clock recovery unit) 312 Frequency division parameter transmission unit (audio clock information generation unit) IAC Audio clock information PCLK Pixel clock (video clock) RCLK reference clock RAC reception audio clock RAC1 first audio clock TAC transmission audio clock TAC1 second audio clock

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

L'invention porte sur un dispositif de réception (111) qui génère une pluralité d'horloges audio (RAC1, RAC2) sur la base d'une horloge de référence (RCLK), et génère des informations d'horloge audio (IAC) qui comprennent des informations de fréquence pour les horloges audio. L'invention porte également sur un dispositif d'émission (101) qui reproduit une horloge audio (TAC1) ayant la fréquence indiquée par les informations d'horloge audio (IAC), et génère une pluralité d'horloges audio (TAC1, TAC2) sur la base de celle-ci. Durant une transmission de données, le dispositif d'émission (101) sélectionne une horloge audio d'émission (TAC) en fonction des information de fréquence d'échantillonnage pour les données audio de transmission, et le dispositif de réception (111) sélectionne une horloge audio de réception (RAC) en fonction des informations de fréquence d'échantillonnage séparées des données de transmission.
PCT/JP2011/001266 2010-08-04 2011-03-03 Système d'émission/réception, dispositif d'émission et dispositif de réception WO2012017573A1 (fr)

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JP2010175660A JP2012039260A (ja) 2010-08-04 2010-08-04 送受信システム、送信装置および受信装置
JP2010-175660 2010-08-04

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