KR950007415A - Video and Audio Signal Synchronizer of MPEG Decoding System - Google Patents
Video and Audio Signal Synchronizer of MPEG Decoding System Download PDFInfo
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- KR950007415A KR950007415A KR1019930016221A KR930016221A KR950007415A KR 950007415 A KR950007415 A KR 950007415A KR 1019930016221 A KR1019930016221 A KR 1019930016221A KR 930016221 A KR930016221 A KR 930016221A KR 950007415 A KR950007415 A KR 950007415A
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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
- H04N21/4302—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
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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
- H04N21/434—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
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
본 발명은 엠펙(MPEG) 복호화 시스템의 영상 및 음성 신호 동기 장치이다.The present invention is an apparatus for synchronizing video and audio signals in an MPEG decoding system.
이와 같은 본 발명은 프레임 순서가 바뀌어 전송되는 엠펙(moving picture expert group : MPEG)시스템에서 영상 및 음성 신호의 비트 스트림(bit stream)을 수신하여 복호하고, 복호된 영상 및 음성신호를 동기화하는 것으로서, 상기 비트 스트림을 수신하여 영상 및 음성 프레임을 추출하며, 상기 영상 및 음성이 디스플레이(display)될 시간 정보 및 프레임 인터벌 값을 추출하는 디멀티플렉서(demultiplexer; DMUX)(60)와, 상기 DMUX(60)로부터 추출된 영상 및 음성 프레임 비트 스트림을 소정시간동안 임시 수용하는 버퍼 수단(70) 및 (80)과, 상기 MPEG 시스템의 기준 시각을 제공하기위해 상기 DMUX(60)로부터 추출된 시스템 클럭 기준(system clock referennce)에 의해 초기화되는 시스템 타임 클럭(STC)(90)과, 상기 DMUX(60)로부터 추출된 영상의 디스플레이 시간값을 저장하는 영상 상연 타임 스탬프 레지스터(video presentation time stamp register : VPTSR)(100)와, 상기 DMUX(60)로부터 추출된 음성의 연주 시간값을 저장하는 음성 상연 타임 스탬프 레지스터(audio presentation time stamp register : APTSR)(110)와, 상기 시스템 타임 클럭(90) 및 레지스터(100)로부터 출력되는 시스템 타임 클럭값(91)과 영상의 디스플레이 시간값(101)을 비교하거나, 상기 시스템 타임 클럭(90) 및 레지스터(110)로부터 출력되는 시스템 타임 클럭값(91)과 음성의 연주시간값(111)을 비교하여 일치되는 순간 소정의 펄스를 발생하는 비교수단(120) 및 (130)과, 상기 비교수단(120)의 출력(121)에서 소정의 펄스기 발생될 때 초기화되며, 이 초기화된 순간부터 계수(counting)를 계속행하여 상기 DMUX(60)로부터 제공되는 프레임 간격값 만큼에 한번씩 펄스를 발생하여 스트로브 신호(strobe signal)를 발생하는 연상 타임 인터벌 발생(video time interval generator; VTIG)수단(140)과, 상기 비교수단(130)의 출력(131)에서 소정의 펄스가 발생될 때 초기화되며, 이 초기화된 순간부토 계수를 계속 행하여 상기 DMUX(60)로부터 제공되는 프레임 간격값 만큼에 한번씩 펄스를 발생하여 스트로브 신호를 발생하는 음성 타임 인터벌 발생(audio time interval generator; ATIG) 수단(150)과, 상기 버퍼수단(70) 및 (80)을 통과한 영상 및 음성 프레임을 복호한 후 상기 발생기(140) 및 (150)로부터 소정의 프레임 간격값에 의해 제공되는 펄스에 의해 영상 및 음성 프레임을 출력하는 영상 및 음성 복호(video and audio decoder)수단(160)(170)으로 구성된다.The present invention as described above receives and decodes a bit stream of video and audio signals in a moving picture expert group (MPEG) system in which the frame order is transmitted, and synchronizes the decoded video and audio signals. A demultiplexer (DMUX) 60 that receives the bit stream and extracts video and audio frames, and extracts time information and frame interval values at which the video and audio are to be displayed, and from the DMUX 60. A buffer means 70 and 80 for temporarily receiving the extracted video and audio frame bit stream for a predetermined time, and a system clock extracted from the DMUX 60 to provide a reference time of the MPEG system. a video performance time for storing a system time clock (STC) 90 initialized by a referennce and a display time value of the video extracted from the DMUX 60; A video presentation time stamp register (VPTSR) 100 and an audio presentation time stamp register APTSR 110 for storing a performance time value of the voice extracted from the DMUX 60; Compare the system time clock value 91 output from the system time clock 90 and the register 100 with the display time value 101 of the image, or output the system time clock 90 and the register 110. Comparing means 120 and 130 for generating a predetermined pulse when the system time clock value 91 is compared with the playing time value 111 of the voice, and the output 121 of the comparing means 120. Is generated when a predetermined pulse generator is generated, and counting is continued from this initial moment to generate a strobe signal by generating a pulse once per frame interval value provided from the DMUX 60. Reminiscent of Im interval occurs (video time interval generator; VTIG) means 140, and is initialized when a predetermined pulse is generated at the output 131 of the comparison means 130, the frame interval value provided from the DMUX 60 by continuously performing the initialized instantaneous coefficient Decodes the video and audio frames passing through the audio time interval generator (ATIG) means 150 and the buffer means 70 and 80. And video and audio decoder means 160 and 170 for outputting video and audio frames by pulses provided by the predetermined frame interval values from the generators 140 and 150. .
따라서 MPEG복호화 시스템에서 프레임 순서가 변경되어 전송되는 영상(화면)과 음성신호의 동기를 일치시켜 보다 고품격의 영상 및 음성을 시청할 수가 있다.Therefore, in the MPEG decoding system, the frame order is changed and the video (screen) transmitted and the audio signal are synchronized so that a higher quality video and audio can be viewed.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.
제1도는 MPEG시스템에서 프레임의 디스플레이 및 복호화 순서를 도시한 도면,1 is a diagram illustrating a display and decoding sequence of a frame in an MPEG system;
제2도는 종래의 MPEG복호화 시스템의 개략적인 블럭도,2 is a schematic block diagram of a conventional MPEG decoding system;
제3도 (가) 및 (나)는 종래의 MPEG복호화 시스템의 영상 및 음성 복호화와 디스플레이 순서를 도시한 도면,3 (a) and (b) show video and audio decoding and display procedures of a conventional MPEG decoding system;
제4도는 본 발명에 따른 MPEG복호화 시스템을 도시한 도면,4 is a diagram showing an MPEG decoding system according to the present invention;
제5도는 제4도의 본 발명의 바람직한 실시예를 통해 실현되는 영상 및 음성 복호화 순서 및 디스플레이 순서를 도시한 도면.FIG. 5 is a diagram showing a video and audio decoding order and a display order realized through the preferred embodiment of the present invention of FIG.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR93016221A KR960009806B1 (en) | 1993-08-20 | 1993-08-20 | Audio and video synchronization circuit for mpeg decoding system |
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KR93016221A KR960009806B1 (en) | 1993-08-20 | 1993-08-20 | Audio and video synchronization circuit for mpeg decoding system |
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KR950007415A true KR950007415A (en) | 1995-03-21 |
KR960009806B1 KR960009806B1 (en) | 1996-07-24 |
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KR93016221A KR960009806B1 (en) | 1993-08-20 | 1993-08-20 | Audio and video synchronization circuit for mpeg decoding system |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100434257B1 (en) * | 1996-12-31 | 2004-10-06 | 엘지전자 주식회사 | Simple moving image display device, specially correlated to miniaturizing the size of an advertising display device, and reducing the price of a system by using an mpeg technology |
KR100632865B1 (en) * | 2006-06-28 | 2006-10-16 | 김종련 | Shipboard incinerator |
KR100775948B1 (en) * | 2006-11-29 | 2007-11-13 | 주식회사 경호엔지니어링 종합건축사사무소 | White smoke reducing system using self-resonance oscillator |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100368759B1 (en) * | 2000-07-20 | 2003-01-24 | 삼성탈레스 주식회사 | Bidirectional transmitting method of mpec moving picture |
-
1993
- 1993-08-20 KR KR93016221A patent/KR960009806B1/en not_active IP Right Cessation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100434257B1 (en) * | 1996-12-31 | 2004-10-06 | 엘지전자 주식회사 | Simple moving image display device, specially correlated to miniaturizing the size of an advertising display device, and reducing the price of a system by using an mpeg technology |
KR100632865B1 (en) * | 2006-06-28 | 2006-10-16 | 김종련 | Shipboard incinerator |
KR100775948B1 (en) * | 2006-11-29 | 2007-11-13 | 주식회사 경호엔지니어링 종합건축사사무소 | White smoke reducing system using self-resonance oscillator |
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Publication number | Publication date |
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KR960009806B1 (en) | 1996-07-24 |
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