WO2006046513A1 - 情報再生装置、バッファ制御方法およびプログラム - Google Patents
情報再生装置、バッファ制御方法およびプログラム Download PDFInfo
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- 238000001514 detection method Methods 0.000 claims abstract description 16
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
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- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/93—Regeneration of the television signal or of selected parts thereof
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- H04L13/08—Intermediate storage means
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- H04N9/806—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components with processing of the sound signal
- H04N9/8063—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components with processing of the sound signal using time division multiplex of the PCM audio and PCM video signals
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- H04N9/89—Time-base error compensation
Definitions
- the present invention decodes an encoded stream including content code data, time management information for reproducing the code data, and a time reference reference value serving as a reference for the time management information.
- a time reference reference value serving as a reference for the time management information.
- the present invention relates to an information reproducing apparatus, a buffer control method, and a program that can be reproduced.
- Blu-ray discs can record about two hours of HD images compressed and encoded using the MPEG method.
- a digital video recorder retains the original image quality by receiving an MPEG stream in the TS format that has been compression-encoded using the MPEG method, and then recording it on a recording medium without modification. can do.
- HDDs use Blu-ray discs, not only for SD images but also for HD images, without reducing the image quality. You can record. Also, recording the received data as it is is advantageous for simplifying the device configuration.
- synchronized playback of video is realized by referring to playback time information described in a data stream and a clock time output from the playback device.
- the PTS (Presentation Time Stamp) power which is the management information for playback output time
- the DTS (Decoding Time Stamp) which is the management information for decoding time
- PCR Program Clock Reference
- SCR System Clock Reference
- PCR correction is performed based on the arrival times and scheduled output times of TS packets from multiple encoders based on a reference clock.
- the MPEG stream provided by digital broadcasting is unlikely to fluctuate in the transmission timing of TS packets, and therefore PCR jitter hardly occurs when the received MPEG stream is decoded and reproduced in real time.
- the recording medium force is read out to the MPEG decoder after being recorded in the buffer and the MPEG stream is read out.
- the data read timing from the recording medium to the buffer is controlled according to the free space of the buffer. Therefore, data transmission having burstiness is performed. For this reason, the PCR transmission timing in the MPEG stream transmitted from the buffer to the MPEG decoder does not match the timing intended by the transmission side.
- the present invention has been made in view of such a point, and even when the transmission timing of the time base reference value in the encoded stream deviates from the intended timing on the encoder side, the code
- An object of the present invention is to provide an information reproducing apparatus that can normally decode and reproduce a stream with a decoder.
- Another object of the present invention is to decode the encoded stream even when the transmission timing of the time base reference value in the encoded stream deviates from the intended timing on the encoder side.
- Another object of the present invention is to decode a coded stream even when the transmission timing of the time base reference value in the coded stream is shifted from the intended timing on the encoder side. It is to provide a buffer control program for controlling reading of a nofter that supplies data to the decoder so that it can be decoded and reproduced normally.
- an information reproducing apparatus that decodes and reproduces an encoded stream including a buffer, a buffer that temporarily stores the packets constituting the encoded stream and sequentially supplies the packets to the decoder; and the packets input to the buffer
- the first data detecting means for detecting the input timing of the first data of the content access unit, the data amount detecting means for detecting the data amount of the packet input to the buffer, and the first data detecting means While the data input timing is detected a predetermined number of times
- an information reproducing apparatus comprising: a read control means for setting a data amount detected by the data amount detection means as a reading speed of the packet from the buffer.
- an encoded stream including encoded content data, time management information for reproducing the encoded data, and a time reference reference value serving as a reference for the time management information is provided.
- the head data detecting means includes: And detecting the start timing of the head data of the access unit of the content from the packet input to the buffer, the data amount detecting means detecting the data amount of the packet input to the buffer, and a read control means
- the data amount detection means is detected while the start data input timing is detected a predetermined number of times.
- the amount of data that is detected by the buffer control method characterized by setting a read-out speed of the packets of the buffer force is provided.
- the period in which the head data of the access unit input to the buffer is input a predetermined number of times is a substantially constant time. Therefore, the amount of data input to the buffer during this period Is almost the same as the packet transmission rate intended by the encoder during that period. Therefore, by controlling the read control means to transmit the packet to the buffer power decoder at this transmission rate, the transmission timing of the time base reference value can be brought close to the intended timing on the encoder side.
- the encoded stream is decoded and reproduced normally by the decoder to improve the quality of the content output regardless of the characteristics of the decoder. be able to.
- FIG. 1 is a diagram showing a schematic configuration of an optical disc apparatus according to an embodiment.
- FIG. 2A is a diagram for explaining calibration of STC using PCR.
- FIG. 2B is a diagram for explaining calibration of STC using PCR.
- FIG. 3 is a diagram for explaining the reception timing of a TS packet when transmission path fluctuation is received.
- FIG. 4 is a diagram for explaining the state of data transmission when an MPEG stream recorded on a recording medium is read and decoded.
- FIG. 5 is a diagram showing functions for buffer read control in the optical disc apparatus of the present embodiment.
- FIG. 6 is a diagram for schematically explaining the input / output timing of a TS packet in the notifier.
- FIG. 1 is a diagram showing a schematic configuration of the optical disc apparatus according to the embodiment.
- FIG. 1 shows a configuration of an optical disc device that can receive a digital broadcast and record it on the optical disc 1 as an example.
- This image recording / reproducing apparatus includes a tuner unit 2, a demodulation unit 3, an ECC (Error Correcting Code) processing unit 4, a write signal generation unit 5, a laser driver 6, an optical pickup 7, an equalizer 8, a PLL (Phase Locked Loop) 9, An AD converter 10, a notch 11, and an MPEG decoder 12 are provided.
- the ECC processing unit 4 includes an ECC encoder 41 and an ECC decoder 42.
- a system controller 13 is provided for comprehensively controlling each of the above blocks.
- As the optical disc 1 for example, a rewritable Blu-ray disc is used.
- the tuner unit 2 receives a broadcast radio wave received by an external antenna, A signal having a predetermined carrier frequency is selected in accordance with an instruction from the system controller 13, and the selected received signal is output to the demodulator 3.
- Broadcast radio waves may be, for example, ground waves or satellite waves relayed by BS or CS. Broadcast signals may also be received through a wired cable.
- the demodulation unit 3 performs QPSK (Quadrature Phase Shift Keying) demodulation and error correction processing on the broadcast signal from the tuner unit 2. Furthermore, the necessary TS packets are separated from the processed data stream and supplied to the ECC encoder 41 of the ECC processing unit 4 when the data is recorded on the optical disc 1 and supplied to the buffer 11 when reproduced.
- QPSK Quadrature Phase Shift Keying
- the ECC encoder 41 adds an error correction code to the data from the demodulator 3 and further performs 8-16 modulation.
- the write signal generator 5 outputs a control signal for the laser driver 6 in accordance with the signal from the ECC encoder 41. At that time, the signal output timing to the laser driver 6 is controlled so as to synchronize with the rotation control of the optical disk 1 by the system controller 13.
- the laser driver 6 drives the recording laser diode of the optical pickup 7 in accordance with the control signal from the write signal generation unit 5, whereby the MPEG stream received through broadcasting is recorded on the optical disc 1. .
- a signal read from the optical disk 1 by the optical pickup 7 is supplied to the equalizer 8.
- the equalizer 8 corrects the frequency characteristics of the input signal and shapes the signal waveform.
- the PLL 9 detects a synchronization signal from the output signal of the equalizer 8.
- the AD converter 10 converts the output signal from the PLL 9 into a digital signal.
- the ECC decoder 42 performs demodulation processing and error correction processing on the digital signal converted by the AD converter 10. As a result, the ECC decoder 42 sequentially outputs TS packets including video and audio to the buffer 11.
- the TS packet stored in the buffer 11 is output to the MPE G decoder 12 under the control of the system controller 13.
- the MPEG decoder 12 Based on the standard time (STC) from the system controller 13, the MPEG decoder 12 performs decompression decoding processing on the video data and audio data in the TS packet from the buffer 11.
- STC standard time
- the MPEG streamer read from the optical disc 1 also reproduces the video signal and the audio signal, and is output to the outside through the interface circuit, not shown.
- TS packets from the demodulator 3 are sequentially stored in the buffer 11, and these TS packets are supplied to the MPEG decoder 12 and decompressed and decoded in the same manner as described above.
- the MPE G stream received through digital broadcasting can be recorded on the optical disc 1 in the TS format.
- the video data and audio data in the TS packet can be recorded without any modification such as decoding and re-encoding, so that the image quality and sound quality are prevented from being deteriorated. It is possible to simplify the equipment configuration and processing system.
- PTS which is management information for playback output time
- DTS which is management information for decoding time
- the system controller 13 outputs a 27 MHz STC that is the reference time of each time management information.
- the MPEG decoder 12 decodes the corresponding video data when the time indicated by the STC and the time indicated by the DTS match, and when the time indicated by the STC and the time indicated by the PTS match, the corresponding video data Or play and output audio data.
- PCR is described in the MPEG-2 TS packet as a standard reference value for PTS and DTS.
- the MPEG decoder 12 uses the encoder side. Decoding processing is executed at the intended timing.
- FIG. 2A and FIG. 2B are diagrams for explaining calibration of STC using PCR.
- FIGS. 2A and 2B assume that TS packets are transmitted through broadcasting. As shown in Figure 2A, a reference time synchronized with the 27 MHz video clock is generated on the transmission side, and the value of the reference time at the TS packet transmission timing is stored in the PCR provided in the TS bucket. Write to field (47 bits).
- the receiving side of the TS packet has a 27 MHz VCO (Variable Controlled Oscillator) and generates an STC by a counter using this as a clock.
- VCO Variable Controlled Oscillator
- the STC count value at that time is set to P Change to CR value.
- PCR is transmitted at an interval of 0.1 msec or less, and when the receiving side receives the PCR, the STC count value at that time is compared with the PCR value, and the VCO transmission frequency is determined based on this difference.
- decoding can be performed as intended by the sending side.
- the VCO transmission frequency control as described above may not be performed normally.
- FIG. 3 is a diagram for explaining the reception timing of a TS packet when it is subjected to transmission path fluctuations.
- TS packets are transmitted through digital broadcasting, since the MPEG stream occupies the transmission path, the TS packets are hardly affected during transmission. Therefore, when reproducing TS packets received through digital broadcasting in real time, the control of the VCO transmission frequency is normally performed normally.
- Fig. 3 shows an example in which the STC count value is "12" when receiving a TS packet with a PCR value of "10" under ideal reception conditions without being subjected to transmission path fluctuations. .
- the PCR reception timing becomes inaccurate.
- This PCR timing deviation is the PCR jitter.
- the TS packet reception timing is accelerated due to the effect of transmission path fluctuation, and when the STC count value is "10", a TS packet with a PCR of "10" is received.
- the transmission side determines that the STC output timing is correct, even though the VCO transmission frequency should be lowered.
- FIG. 4 is a diagram for explaining the state of data transmission when the MPEG stream recorded on the recording medium is read and decoded.
- the TS stream MPEG stream received through digital broadcasting can be recorded on the optical disk 1 as it is.
- the TS packet is received at a timing almost as intended on the transmission side, but the reception timing is not changed when the TS packet is recorded on the recording medium. Because information is lost, PCR jitter may occur.
- the TS packet of the MPEG stream read from the optical disc 1 is stored in the buffer 11 and then read out to the MPEG decoder 12.
- TS packets are transferred discontinuously to the buffer 11.
- the transmission path of the TS packet from the buffer 11 to the MPEG decoder 12 is fluctuated, and the PCR transmission timing matches the timing intended by the transmission side. Failure to do so causes PCR jitter.
- the amount of PCR jitter generated may be far greater than the specified tolerance, such as tens to hundreds of milliseconds.
- Such PCR jitter occurs when information on the arrival time of a TS packet at the time of reception through digital broadcasting is lost along with recording on the recording medium.
- the occurrence of PCR jitter can be prevented by recording the arrival time of both on the recording medium and using it to control the transfer rate to the MPEG decoder 12 during playback.
- this method is preferable from the viewpoint of the capacity of the recording medium and the complexity of processing during recording.
- the arrival time of the TS packet is based on the data rate at the time of transmission of the TS packet. Can be estimated. That is, if the reciprocal of the data rate is set as the read cycle from the buffer 11, the transmission timing at the time of reception can be almost restored. Therefore, in this embodiment, the data rate of TS packets in the recording medium is appropriately detected at the time of reading, and the reading rate from the buffer 11 is controlled according to the detected data rate, thereby generating PCR jitter. Suppress.
- the data amount of the TS packet read from the optical disc 1 is detected in units of pictures. Since the HDTV progressive method stipulates 30 frames and Z seconds, the data rate is obtained by detecting the amount of TS packet data equivalent to one picture.
- the video ES Elementary Stream
- “OxOO_00_01_00” is described as the picture start code (Picture—Start_Code) at the beginning of the picture, and the amount of data until the next detection Can be used as the data rate.
- the MPEG-2 system is allowed to vary the code rate, if the data rate is reflected in units of one picture, the reading speed of the noffer 11 may vary greatly. is there. In practice, for example, even when the reading speed is adjusted based on an average data rate of about 1 second, it is possible to obtain a PCR jitter suppression effect. In this embodiment, as an example, the data amount for 30 frames, that is, 1 second is detected as the data rate.
- FIG. 5 is a diagram showing a function for reading control of the buffer 11 in the optical disc apparatus of the present embodiment.
- the optical disk apparatus includes a picture start code detecting unit 131, counters 132 and 133, a delay flip-flop (DFF) 134, and a reading control unit 135.
- a picture start code detecting unit 131 counters 132 and 133
- a delay flip-flop (DFF) 134 DFF
- DFF delay flip-flop
- the picture start code detection unit 131 receives TS packets that are read from the optical disc 1 and output from the ECC decoder 42 to the buffer 11. At the same time, a data enable signal indicating the timing of data writing to the notch 11 is received from the ECC decoder 42. The picture start code detector 131 receives the data enable signal. The received TS packet data is monitored using the reception timing as a clock, and a detection signal is output when a picture start code is detected.
- the counter 132 counts the number of times that the detection signal is output by the picture start code detector 131, and outputs a timing signal and resets the force count value when the number of times reaches 30.
- the timing signal is output from the counter 132 each time a TS packet for image and sound reproduction for one second is input to the buffer 11.
- the counter 133 receives the data enable signal for the buffer 11 as a clock, and counts the number of times this signal is input. The count value is reset at the output timing of the timing signal from the counter 132.
- the DFF 134 latches the count value output from the counter 133 at the output timing of the control signal from the counter 132. As a result, the latched value of DFF134 becomes the data amount of the TS packet for playback of the image and sound for one second input to the buffer 11 immediately before that, and this is the data rate.
- the read control unit 135 adjusts the data read speed from the buffer 11 to the MPEG decoder 12 so as to match the data rate output from the DFF 134. That is, control is performed so that the read speed is increased when the input data rate is increased and the read speed is decreased when the data rate is decreased.
- FIG. 6 is a diagram for schematically explaining the input / output timing of the TS packet in the notifier 11.
- the interval at which the 30th picture start code is detected by the counter 132 is not constant. In other words, the reading time of data for playing back images and sounds for 1 second is not constant.
- the MPEG decoder 12 can always decode and reproduce images and sound normally, and the probability of occurrence of symptoms such as screen freeze, blackout, buzz and silence is greatly reduced.
- the permissible amount of PCR jitter is standardized.
- the actual permissible amount of MPEG decoders that are commercially available is not necessarily the same.
- the screen freezes due to the occurrence of 1 ⁇ sec PCR jitter. Some may cause normal operation even if 100 ⁇ sec PCR jitter occurs.
- whether or not it operates normally depends on the content of the MPEG stream to be decoded, so even if it operates normally during testing, it cannot be said that it will always operate normally after being put into the factory. Therefore, it is desirable to suppress the amount of PCR jitter generated as reliably as possible.
- the power using the head reception timing of the picture to detect the data rate of the TS packet is not limited to this.
- the head reception of the access unit of image data or audio data is not limited to this. Timing may be used. Therefore, the present invention can be applied to an encoding stream to be reproduced that includes only audio data in addition to an image and audio data.
- the encoding method of the stream is not limited to the MPEG method, and other encoding methods can be applied.
- other recording media such as a power HDD indicating an optical disk as a recording medium for recording an encoded stream to be reproduced and a memory card using a semiconductor memory are also applied.
- the encoded stream to be recorded is not limited to that received through broadcasting, but may be received through a network, for example.
- the present invention can be applied to playback of an encoded stream recorded in advance on a playback-only optical disk, such as a commercially available video content such as a movie.
- the processing functions described above can be realized by a computer.
- a program describing the processing contents of the functions that the information reproducing apparatus should have is provided.
- the said processing function is implement
- the program describing the processing contents can be recorded on a computer-readable recording medium.
- the computer-readable recording medium include a magnetic recording device using a magnetic tape and a magnetic disk, an optical disk, a magneto-optical recording medium, and a semiconductor memory.
- the computer that executes the program stores, for example, the program recorded on the portable recording medium or the program to which the server computer power is also transferred in its own storage device. Then, the computer reads its own storage device power program and executes processing according to the program. The computer can also read the program directly from the portable recording medium and execute processing according to the program. In addition, each time the server computer program is transferred, the computer can also execute processing according to the received program.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Databases & Information Systems (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Television Signal Processing For Recording (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Communication Control (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR20077008308A KR101084283B1 (ko) | 2004-10-27 | 2005-10-24 | 정보 재생 장치, 버퍼 제어 방법 및 기록 매체 |
US11/666,112 US8391681B2 (en) | 2004-10-27 | 2005-10-24 | Information reproducing apparatus, and buffer control method and program |
EP05795908A EP1806923B1 (en) | 2004-10-27 | 2005-10-24 | Information reproduction device, buffer control method, and program |
ES05795908T ES2389909T3 (es) | 2004-10-27 | 2005-10-24 | Dispositivo de reproducción de información, método de control de memoria intermedia, y programa |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004311895A JP4337707B2 (ja) | 2004-10-27 | 2004-10-27 | 情報再生装置、バッファ制御方法およびプログラム |
JP2004-311895 | 2004-10-27 |
Publications (1)
Publication Number | Publication Date |
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WO2006046513A1 true WO2006046513A1 (ja) | 2006-05-04 |
Family
ID=36227753
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/019505 WO2006046513A1 (ja) | 2004-10-27 | 2005-10-24 | 情報再生装置、バッファ制御方法およびプログラム |
Country Status (7)
Country | Link |
---|---|
US (1) | US8391681B2 (ja) |
EP (1) | EP1806923B1 (ja) |
JP (1) | JP4337707B2 (ja) |
KR (1) | KR101084283B1 (ja) |
CN (1) | CN100542253C (ja) |
ES (1) | ES2389909T3 (ja) |
WO (1) | WO2006046513A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012039513A (ja) * | 2010-08-10 | 2012-02-23 | Hitachi Kokusai Electric Inc | デジタル放送送出装置 |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
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ITTO20060668A1 (it) * | 2006-09-19 | 2008-03-20 | Rai Radiotelevisione Italiana Spa | Metodo per riprodurre una sequenza audio e/o video, dispositivo di riproduzione ed apparecchio riproduttore che lo utilizzano |
US20090026581A1 (en) | 2007-07-25 | 2009-01-29 | Jin-Ha Park | Flash memory device and method of manufacturing the same |
FR2933562B1 (fr) * | 2008-07-03 | 2012-12-14 | Enensys Technologies | Dispositif de generation de flux, procede de calcul d'un niveau de remplissage d'un tampon d'entree au sein du dispositif et procede de regulation de flux |
JP2014075735A (ja) * | 2012-10-05 | 2014-04-24 | Sony Corp | 画像処理装置および画像処理方法 |
CN105577307A (zh) * | 2014-10-14 | 2016-05-11 | 中兴通讯股份有限公司 | 一种实现时间和时钟同步的方法及装置 |
JP2016126037A (ja) * | 2014-12-26 | 2016-07-11 | ソニー株式会社 | 信号処理装置、および信号処理方法、並びにプログラム |
CN105812902B (zh) * | 2016-03-17 | 2018-09-04 | 联发科技(新加坡)私人有限公司 | 数据播放的方法、设备及系统 |
WO2020218201A1 (ja) * | 2019-04-26 | 2020-10-29 | 富士フイルム株式会社 | 撮像素子、撮像装置、撮像素子の作動方法、及びプログラム |
KR102400936B1 (ko) * | 2021-11-30 | 2022-05-23 | 주식회사 인터엠 | 네트워크 기반 전관 방송에서의 오디오 클록 조정 |
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EP0737959A4 (en) * | 1994-10-28 | 1999-05-06 | Nippon Steel Corp | DEVICE FOR DECODING ENCODED DATA, AND USING DEVICE FOR DECODING MULTIPLEXED AUDIO / VIDEO DATA |
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EP1262975A2 (en) * | 2001-05-31 | 2002-12-04 | Matsushita Electric Industrial Co., Ltd. | Disc drive device with speed control means |
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2004
- 2004-10-27 JP JP2004311895A patent/JP4337707B2/ja not_active Expired - Fee Related
-
2005
- 2005-10-24 ES ES05795908T patent/ES2389909T3/es active Active
- 2005-10-24 EP EP05795908A patent/EP1806923B1/en not_active Expired - Fee Related
- 2005-10-24 US US11/666,112 patent/US8391681B2/en not_active Expired - Fee Related
- 2005-10-24 WO PCT/JP2005/019505 patent/WO2006046513A1/ja active Application Filing
- 2005-10-24 CN CNB2005800369693A patent/CN100542253C/zh not_active Expired - Fee Related
- 2005-10-24 KR KR20077008308A patent/KR101084283B1/ko not_active IP Right Cessation
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EP0204276A1 (en) | 1985-05-30 | 1986-12-10 | Nippon Kokan Kabushiki Kaisha | Components for engines and production therefor |
EP0797325A2 (en) | 1996-03-22 | 1997-09-24 | D2B Systems Co. Ltd. | Receiver with data frame buffering |
JP2000332831A (ja) * | 1999-03-17 | 2000-11-30 | Sony Corp | 通信装置、通信方法、および記録媒体 |
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JP2012039513A (ja) * | 2010-08-10 | 2012-02-23 | Hitachi Kokusai Electric Inc | デジタル放送送出装置 |
Also Published As
Publication number | Publication date |
---|---|
US8391681B2 (en) | 2013-03-05 |
CN100542253C (zh) | 2009-09-16 |
EP1806923A4 (en) | 2009-11-25 |
EP1806923B1 (en) | 2012-06-20 |
US20090016448A1 (en) | 2009-01-15 |
ES2389909T3 (es) | 2012-11-02 |
CN101049016A (zh) | 2007-10-03 |
EP1806923A1 (en) | 2007-07-11 |
KR20070074563A (ko) | 2007-07-12 |
JP4337707B2 (ja) | 2009-09-30 |
JP2006128857A (ja) | 2006-05-18 |
KR101084283B1 (ko) | 2011-11-17 |
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