WO2007086564A1 - Méthode de synchronisation de station d’émission et dispositif de commande - Google Patents

Méthode de synchronisation de station d’émission et dispositif de commande Download PDF

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Publication number
WO2007086564A1
WO2007086564A1 PCT/JP2007/051407 JP2007051407W WO2007086564A1 WO 2007086564 A1 WO2007086564 A1 WO 2007086564A1 JP 2007051407 W JP2007051407 W JP 2007051407W WO 2007086564 A1 WO2007086564 A1 WO 2007086564A1
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WO
WIPO (PCT)
Prior art keywords
audio
synchronization
reference value
pcm data
time reference
Prior art date
Application number
PCT/JP2007/051407
Other languages
English (en)
Japanese (ja)
Inventor
Kazuyuki Takizawa
Isamu Mochizuki
Original Assignee
Renesas Technology Corp.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renesas Technology Corp. filed Critical Renesas Technology Corp.
Publication of WO2007086564A1 publication Critical patent/WO2007086564A1/fr

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Classifications

    • 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]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2368—Multiplexing of audio and video streams
    • 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
    • H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
    • H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
    • H04N21/43072—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen of multiple content streams on the same device
    • 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
    • H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
    • H04N21/4305—Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets
    • 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
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4341—Demultiplexing of audio and video streams

Definitions

  • the present invention relates to a broadcasting station synchronization technique in a digital TV broadcast receiving system, and more particularly, to a broadcasting station synchronization of a portable terminal device that is not capable of clocking a different frequency asynchronously with a system clock that is a reference in the broadcasting station. It relates to an effective technique applied to the method. Background art
  • a low-cost, non-feedback oscillator is used instead of a voltage feedback oscillator such as a VCO (Voltage Controlled Oscillator).
  • VCO Voltage Controlled Oscillator
  • a method has been proposed in which a program time reference value PCR (Program Clock Reference) and a playback audio time stamp are compared to detect a deviation and to correct the deviation to synchronize with a broadcasting station (for example, patents). Reference 1).
  • Patent Document 1 Japanese Patent Laid-Open No. 2004-23136 (Fig. 1)
  • the system clock of a mobile phone is a frequency mainly intended for communication, it is asynchronous and different in frequency from the 27 MHz broadcast station reference clock required for receiving digital TV broadcasts. If the same 27MHz VCO and PLL (Phase Locked Loop) as the fixed receiver are installed, it is easy to synchronize with the broadcasting station, but the mobile phone becomes larger due to cost increases and additional parts, and a new clock is added. Problems such as noise generated by the key occur. Furthermore, the increase in current consumption due to parts tracking reduces viewing time, which is unpleasant.
  • an object of the present invention is to receive digital TV broadcasts in a mobile terminal, so that it is not necessary to add a component such as a 27MHz VCO to the mobile terminal.
  • the purpose is to provide broadcasting station synchronization technology that can synchronize with the broadcasting station using only the system clock while suppressing distortion of the playback audio.
  • a playback STC Synst em Time Clock
  • PTS Presentation Time Stamp
  • PCM data is compared to the sampling frequency of the PCM data to be played, rather than increasing or decreasing the number of PCM data output to the Audio DAC (Digital Analog Converter).
  • the timing at which PCM data is sent to Audio—DAC with respect to the sampling frequency of PCM data, plus or minus Z adjustment, the PCM data playback time for a certain number of samples can be delayed or advanced.
  • the audio playback time can be adjusted without increasing / decreasing the number of PCM data, so that audio playback with reduced distortion is possible.
  • the present embodiment is applied to all CPUs having a digital TV broadcast receiving function.
  • a method of processing by an application dedicated CPU will be described. This is not intended to limit the LSI configuration on the receiving side applied to the invention, but the same control is possible even with, for example, a communication CPU other than the application dedicated CPU.
  • the present embodiment is applied to all mobile terminals having a digital TV broadcast receiving function.
  • a mobile phone will be described as an example of the mobile terminal. This does not limit the device on the receiving side applied to the present invention.
  • PHS Personal Handyphone System
  • PDA Personal Digital Assistance
  • a mobile terminal that does not have a clock generator of the same frequency as a 27 MHz broadcast station reference clock receives a digital TV broadcast.
  • a method for improving the synchronization accuracy in broadcasting station synchronization will be described.
  • FIG. 1 is a block configuration diagram showing an example of a schematic configuration of the mobile phone according to the present embodiment.
  • the mobile phone in the present embodiment includes a communication antenna 101, a wireless communication unit 102, a code decoding processing unit 103, a microphone 104, a receiver 105, a communication CPU 106, an input unit 107, a system clock 108, and a digital TV.
  • the antenna 101 converts radio waves into high frequency electrical signals and vice versa.
  • the radio communication unit 102 is a means for demodulating the high frequency electrical signal and modulating the output signal of the code decoding processing unit 103.
  • the encoding / decoding processing unit 103 decodes the output signal of the wireless communication unit 102 and outputs it to the receiver 105 and the communication CPU 106, and conversely encodes the output signal of the communication CPU 106 and microphone 104, Means for outputting to 102.
  • the communication CPU 106 is a control unit that mainly performs processing and control related to telephone communication.
  • Input unit 107 Means such as numeric keys and cursor keys.
  • the system clock 108 is a frequency different from the 27 MHz clock, and a frequency necessary for communication is mainly used. Further, the clock is often used as a system clock of the communication CPU 106.
  • the digital TV antenna 109 is an antenna for receiving radio waves of digital TV broadcasting and converting them into high-frequency electric signals.
  • the digital TV high-frequency unit 110 is a high-frequency unit that demodulates the high-frequency electrical signal output from the digital TV antenna 109.
  • the application CPU 111 is a control unit that mainly performs processing and control related to mobile phone applications.
  • the storage unit 112 is a memory that serves as a work area for storing programs and data of the application CPU 111 or executing the application.
  • the display unit 11 3 is a means such as an LCD.
  • Audio—DAC114 is a DAC that converts PCM data into analog sound.
  • FIG. 2 is a diagram illustrating an example of a schematic configuration diagram in the application CPU 111 necessary for receiving digital TV broadcast and an example of a flow of video and audio data.
  • an MPEG2-transport stream (hereinafter referred to as MPEG2-TS), which is a protocol used in the digital broadcasting standard output from the high-frequency unit 110 for digital TV, is, for example, every 188 bytes.
  • the TS processing unit 201 that packs and transfers to the TS buffer 2 51, MPEG2-TS is a moving picture elementary stream (hereinafter referred to as Video—ES), and an audio elementary stream (hereinafter referred to as Audio—ES).
  • TS-DeMux unit 202 to be separated, Video-ES unit 203 that decodes the separated Video-ES and converts it into drawing data that can be displayed on display unit 113, and the drawing data is transferred to display unit 113 Display control unit 204, audio decoding unit 205 that decodes the separated Audio—ES and converts it to PCM data, and PCM data transfer to Audio—DAC 114, and playback of PCM data
  • the DMAC 207 for transferring PCM data at high speed on behalf of the CPU between the audio control unit 206 for setting the sampling frequency (hereinafter referred to as fs), for example, between the storage unit 112 and the audio control unit 206.
  • the CPU core unit 208 that controls the above-described processes and calculates the audio playback time, etc., and the system clock 108, which plays an important role in synchronizing with the broadcasting station in the present invention, are always counted. Holds the PCR value extracted by the free-run counter 209 that performs the operation and the TS processing unit 201. PCR value holding buffer 210 and a free-run counter value holding buffer 211 during PCR reception for holding a free-run counter value during PCR reception.
  • the TS buffer 251 for temporarily holding various data generated by the above-described processing, the time stamp buffer 252 for temporarily holding the value of the free-run counter 209, and the PCM data buffer 253 It consists of.
  • the value held by the time stamp buffer 252 is the value of the free-run counter 209 when the first data of the data group packed by the TS processing unit 201 is received by the TS processing unit 201.
  • the DMAC 207 can set the number of DMA (Direct Memory Access) transfers, and transfers PCM data of the number of samples corresponding to the set number of times. The DMA transfer is repeated until the digital TV broadcast ends or until the user performs a viewing end operation.
  • the DMAC 207 outputs a DMAC transfer completion interrupt when the PCM data transfer of the set number of samples is completed. This DMAC transfer completion interrupt is input to the CPU core unit 208, held in the free run counter 209 value and the PCR value holding buffer 210, and held in the free run counter value holding buffer 211 at the time of PCR reception. It is also used as a timing signal for obtaining the value and calculating the STC value for playback.
  • DMA Direct Memory Access
  • each of the noffers 251, 252, and 253 Since the data sizes handled by each of the noffers 251, 252, and 253 are large, it is common to divide the storage unit 112 used for work memory and divide it into various buffers. You may allocate memory for it. Alternatively, each buffer may be distributed and allocated to the external storage unit 112 and the internal memory of the application CPU 111.
  • FIG. 3 is a configuration diagram showing an example of a schematic configuration of the audio control unit 206.
  • the audio control unit 206 reconfigures the signal so that the PCM data processing unit 301 for setting the fs of PCM data, stereo Z monaural, etc. and the PCM data can be output to the Audio—DAC 114, and sets LRCLKZBCLKZData.
  • FIFO First In First Out
  • the PCM data processing unit 301 it is necessary to set fs in advance. To perform accurate audio playback, it is necessary to set the fs of PCM data correctly.
  • the PCM data processing unit 301 can output to the Audio-DAC with an output fs different from fs of the input PCM data by fs conversion by filtering processing or the like. This is an effective method for mobile phones that do not have a master clock for audio playback. Similarly to broadcasting station synchronization, fs that can be generated with the system clock of the mobile phone is set in the PCM data processing unit 301 as output fs. PCM data is played back.
  • the input FIF0351 has a very small capacity compared to the size of the content to be played back, monitor the amount of data in the input FIF0351 to prevent underflow and overflow, and Request the DMAC 207 to transfer the next data.
  • FIG. 4 is a main flow diagram showing an example of a series of operations from the start of viewing.
  • FIG. 5 is a flowchart showing an example of the operation for acquiring the reproduction STC value in the broadcasting station synchronization processing.
  • FIG. 6 is a flowchart showing in detail an example of the operation of “correcting the difference between the STC value for reproduction and the Audio—PTS value” in the main flow of FIG.
  • the radio wave power received by the digital TV antenna 109 also decodes the channel information and the like. Settings are made and initialization of the PCR value holding buffer 210 and the free-run counter value holding buffer 211 at the time of PCR reception necessary for the broadcasting station synchronization method is performed (S101). Both of these buffers are generally allocated in the storage unit 112 as long as they can be handled by the memory built in the application CPU 111.
  • the TS processing unit 201 packs the MPE G2-TS received for each determined number of bytes, for example, 188 bytes, and stores the packed data in the TS notifier 251 (S102). At this time, packing The value of the free-run counter 209 is latched at the timing when the first data of the MPEG2-TS to be received is received and stored in the time stamp buffer 252 (S103).
  • the CPU core unit 208 checks whether a PCR exists in the header portion of the packed data stored in the TS buffer 251 (S104). If the PCR is present to!
  • the MPEG2-TS stored in the TS buffer 251 is divided into Video-ES and Audio-ES by the TS-DeMux unit 202, and is not stored here, but is stored in each buffer.
  • the Video-ES is decoded by the video decoding unit 203, and the display control unit 204 displays the audio in accordance with the audio playback timing. Then, the drawing process is performed.
  • the Audio—ES divided by the TS—DeMux unit 202 is decoded by the Audio decoding unit 205, converted into PCM data, and stored in the PCM data buffer 253 (S106).
  • the PCM data in the PCM data buffer 253 is transferred to the Audio control unit 206 by the DMAC 207, the timing is reset by the Audio control unit 206, converted to analog audio by the Audio—DAC 114, and output from the speaker 115. (S 107).
  • the STC value for playback is calculated using the PCM data transfer completion interrupt as a trigger (S 108), the STC value for playback calculated using the PCR value and the free-run counter value, and the audio data
  • the audio-PTS value is compared at regular intervals, and the difference between the STC value for playback and the Audio—PTS value is calculated, and the power that will be explained in detail later using FIG. 6 is eliminated.
  • Audio— The input fs set in the PCM data processing unit 301 is corrected so that the PTS follows the playback STC (S109). This allows the broadcast station to synchronize the mobile phone and watch the program.
  • the correction width of the input fs is set within an allowable range for human auditory characteristics, so that the distortion and unnaturalness of the reproduced sound can be suppressed.
  • the PCM data playback process As a PCM data playback process, as long as the user continues to watch digital TV broadcasts even after the DMAC transfer completion interrupt is output, the PCM data playback process immediately returns to the PCM data transfer process for the next Audio-frame. Continue the PCM data transfer process so that the audio to be played is not interrupted. In the second and subsequent PCM data transfer processing, the input fs set value is corrected to adjust the audio playback time by synchronizing with the broadcast station.
  • the transfer completion interrupt of the DMAC 207 is used as a trigger for executing the calculation of the reproduction STC.
  • PCM data is transferred to the Audio control unit 206 in units of Audio-frame (1024 samples or 2048 samples). Therefore, the period for performing the correction by comparing the STC value for reproduction and the Audio-PTS value to obtain the deviation is also the Audio-frame period.
  • a DMAC transfer completion interrupt is output from the DMAC 207 (S201).
  • the CPU core unit 208 When the CPU core unit 208 receives this DMAC transfer completion interrupt, it starts collecting necessary data to calculate the STC value for reproduction. First, the value of the free run counter 209 when the DMAC transfer completion interrupt is output is acquired (S202). Furthermore, the PCR value transferred to the PCR value holding buffer and the free run count value at the time of PCR reception transferred to the free run counter value holding buffer at the time of PCR reception are acquired (S203). Apply these three values to the following equation to calculate the STC value for playback (S204).
  • Reception STC value PCR value + (Free run count value when receiving DMAC transfer completion interrupt — Free run count value when receiving PCR) X unit conversion coefficient
  • the free-run counter value that may change depending on the design conditions of the mobile terminal is multiplied by the unit conversion coefficient, and the free-run counter value is converted to the same rate as the PCR value. Since this conversion factor is uniquely determined by the frequency of the system clock, it can be fixed at the time of terminal design.
  • the CPU core unit 208 obtains the STC value for reproduction obtained by calculation and the Audio— PTS value attached to the PCM data to be reproduced, the two values are compared, so that the time between the broadcasting station and the mobile phone is obtained. It is detected whether there is any misalignment (S301). Here, if there is no deviation (Yes in S301), broadcast station synchronization correction processing is not performed, PCM data transfer continues, and audio playback continues.
  • PCM data during PCM data playback will be adjusted so that the progress of the STC value for playback matches the progress of the Audio—PTS value of the mobile phone.
  • the audio playback time is adjusted by correcting the input fs set value of the data processing unit 301.
  • it is checked which time is delayed (S302). From the result, determine whether to correct the input fs set value to the plus side or to the minus side.
  • the playback time can be advanced by about 0.018msec compared to the case where the input fs is not corrected, and more audio data can be played back by the amount that has been advanced.
  • the playback time can be delayed by about 0.017 msec, so the number of PCM data to be played back within a certain period can be reduced. [0052] If the audio playback time is adjusted by the above method, it is not necessary to change the number of PCM data that is actually played back, so that it is not necessary to distort the playback audio.
  • the mobile terminal can synchronize with the broadcast station while suppressing distortion of the reproduced audio without adding a component such as a 27 MHz VCO to the mobile terminal.
  • a component such as a 27 MHz VCO
  • the fs correction amount can be suppressed within 0.2%, which is an allowable range for human auditory characteristics, it is possible to further suppress the distortion and unnaturalness of the reproduced sound. Become.
  • the present invention relates to a broadcasting station synchronization technique in a digital TV receiving system, and in particular, is applied to a mobile terminal having a digital TV receiving function, and has a similar configuration of a mobile phone, PHS, PDA, etc. other than a mobile phone. It can be widely applied to devices on the receiving side.
  • FIG. 1 is a block configuration diagram showing an example of a schematic configuration of a mobile phone according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing an example of a schematic configuration diagram in an application CPU necessary for receiving a digital TV broadcast and an example of a flow of video / audio data in the embodiment of the present invention.
  • FIG. 3 is a configuration diagram showing an example of a schematic configuration of an audio control unit according to an embodiment of the present invention.
  • FIG. 4 is a main flow diagram showing an example of a series of operations with viewing power in the embodiment of the present invention.
  • FIG. 5 is a flowchart showing an example of an operation for obtaining a reproduction STC value in an embodiment of the present invention.
  • Fig. 6 is a flowchart showing in detail an example of an operation for correcting a deviation between a reproduction STC value and an Audio-PTS value in the embodiment of the present invention.
  • Display control section 205 "Audio decoding section, 206" Audio control section, 207-- -DMAC, 208 ⁇ “CPU core part, 209 ⁇ Free run counter, 210 ⁇ PCR value holding buffer, 211 .Free run counter value holding buffer during PCR reception, 251 .TS notifier, 252 ⁇ ⁇ Timestamp buffer, 253 .PCM data buffer, 301 "'PCM data processing section, 302 .DAC—IF section, 351 ⁇ Input FIFO, 352 ⁇ Output FIFO.

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

Abstract

De façon à recevoir sur un terminal mobile une émission TV numérique, une synchronisation avec une station d’émission est obtenue en utilisant une horloge système dans le terminal mobile sans ajouter de VCO à 27 MHz, etc. L’instant de reproduction audio est volontairement ajusté pour éliminer une différence entre une valeur STC de reproduction en tant que valeur de référence d’heure système pour la reproduction calculée de la valeur PCR reçue et l’horloge système du terminal et une information d’instant de présentation de reproduction audio de valeur PTS audio pour synchronisation, obtenant ainsi la synchronisation entre le dispositif terminal mobile et la station d’émission. Au lieu d’augmenter et diminuer la quantité de données PCM fournies au DAC audio, la synchronisation d’envoi des données PCM au DAC audio est ajustée pour reproduire la fréquence d’échantillonnage des données PCM. Il est possible de retarder ou avancer l’instant de reproduction des données PCM pour chaque nombre constant d’échantillons. Autrement dit, on peut ajuster l’instant de reproduction audio sans augmenter ni diminuer la quantité de données PCM, ce qui se traduit par une reproduction audio sans distorsion.
PCT/JP2007/051407 2006-01-30 2007-01-29 Méthode de synchronisation de station d’émission et dispositif de commande WO2007086564A1 (fr)

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JP2006020161A JP2007201983A (ja) 2006-01-30 2006-01-30 放送局同期方法、及び制御装置
JP2006-020161 2006-01-30

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Cited By (2)

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CN103686290A (zh) * 2013-12-27 2014-03-26 乐视致新电子科技（天津）有限公司 移动通信终端控制智能电视延时播放视频的方法及装置
JP2017041713A (ja) * 2015-08-19 2017-02-23 ヤマハ株式会社 コンテンツデータ配信システムおよびコンテンツデータ配信方法

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JP2007202086A (ja) * 2006-01-30 2007-08-09 Toshiba Corp クロック再生装置、及びクロック再生方法
EP2043323A1 (fr) 2007-09-28 2009-04-01 THOMSON Licensing Dispositif de communication pour synchroniser le flux recu avec un flux envoyé vers un autre dispositif
JP5496548B2 (ja) 2009-05-29 2014-05-21 ルネサスエレクトロニクス株式会社 半導体集積回路

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JP2017041713A (ja) * 2015-08-19 2017-02-23 ヤマハ株式会社 コンテンツデータ配信システムおよびコンテンツデータ配信方法
EP3340526A4 (fr) * 2015-08-19 2019-04-10 Yamaha Corporation Système de distribution de données de contenu, et procédé de distribution de données de contenu
US11438400B2 (en) 2015-08-19 2022-09-06 Yamaha Corporation Content data delivery system, server, and content data delivery method

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