KR960025596A - How to play shifting digital digital - Google Patents

How to play shifting digital digital Download PDF

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Publication number
KR960025596A
KR960025596A KR1019940035100A KR19940035100A KR960025596A KR 960025596 A KR960025596 A KR 960025596A KR 1019940035100 A KR1019940035100 A KR 1019940035100A KR 19940035100 A KR19940035100 A KR 19940035100A KR 960025596 A KR960025596 A KR 960025596A
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KR
South Korea
Prior art keywords
playback
picture
constant speed
tracks
gop
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KR1019940035100A
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Korean (ko)
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KR0139753B1 (en
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김형석
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구자홍
Lg 전자주식회사
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Priority to KR1019940035100A priority Critical patent/KR0139753B1/en
Publication of KR960025596A publication Critical patent/KR960025596A/en
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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
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10037—A/D conversion, D/A conversion, sampling, slicing and digital quantisation or adjusting parameters thereof
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/005—Reproducing at a different information rate from the information rate of recording

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

본 발명은 디지털 브이씨알의 변속 재생 방법에 관한 것으로, 일반적으로 MPEG2 방식에 의한 디지털 입축 비디오의 재생에서 가장 큰 문제점은 픽쳐(picture)간 에측을 수행하여 차픽쳐(picture)만을 부호화하기 때문에 한 픽쳐(picture)분의 데이타로는 I-픽쳐(picture)를 제외하고는 원픽쳐(picture)을 복원할 수 없을 뿐 아니라, 가변길이 부호화와 픽쳐(picture) 부호화 타입에 따르는 픽쳐(picture)간 발생 비트량의 큰 차이로 인하여 랜덤 억세스가 가능하지 않은 테이프의 경우 고속의 특수재생의 구현에는 많은 어려움이 수반되고 있다. 이러한 점을 해결하기 위하여 본 발명은 MPEG2 에 준하여 부호화된 비트열에서 I-프레임을 포함하는 GOP를 검출하여 그 길이를 추정함에 의해 정속 재생 구간에서 다음의 변속구간에서 스킵할 트랙의 수를 정확하게 추정하므로써 스킵 후 안정적으로 I-픽쳐(picture)을 재생하도록 창안한 것으로,본 발명은 GOP 발생 비트량이 어느 정도 일정함을 이용하여 변속 재생시 GOP의 길이를 추출하여 스킵 및 정속 재생 구간을 산출하므로써 테이프와 같은 순차적 억세스 저장 매체에서 특수 재생을 안정되게 수행할 수 있는 효과가 있다.BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a variable playback method of digital VRs. In general, the biggest problem in the reproduction of digital stereoscopic video by MPEG2 is that only one picture is encoded by performing inter-picture prediction. The data for the picture cannot recover the original picture except for the I-picture, and the bits generated between the pictures according to the variable length coding and the picture coding type. Due to the large difference in the amount of tapes, it is difficult to implement high-speed special playback in the case of the tape which is not accessible randomly. In order to solve this problem, the present invention accurately estimates the number of tracks to be skipped in the next shift section in the constant speed playback section by detecting the GOP including the I-frame in the bit stream encoded according to MPEG2 and estimating the length thereof. Therefore, the present invention is designed to stably reproduce an I-picture after skipping. The present invention extracts the length of a GOP during shift playback using a constant amount of GOP generation bit, and calculates a skip and constant speed playback section. In the sequential access storage media such as the above, there is an effect that the special playback can be stably performed.

Description

디지탈 브이씨알의 변속 재생 방법How to play shifting digital digital

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제7도는 본 발명의 특수 재생을 위한 신호 흐름도.7 is a signal flow diagram for special reproduction of the present invention.

Claims (3)

초기 정속 재생 구간에서 GOP 길이를 추정하고 정속 재생 모드인지 판별하는 제1단계와, 제1단계에서 정속재생 모드이면 정속 재생을 수행하는 제2단계와, 제1단계에서 변속 재생 모드를 판별하면 GOP 길이로 부터 산출된 배속구간의 트랙수 'N'과 정속 구간의 트랙수 'P'만큼 스킵과 정속 재생을 수행하고 변속 재생의 끝인지 판별하는 제3단계와,제3단계에서 변속 재생의 끝이 아니면 GOP 길이를 재추정하여 배속 구간의 트랙수 'N'과 정속 구간의 트랙수 'P'를 산출하여 상기 제3단계를 반복 수행하는 제4단계를 수행하는 것을 특징으로 하는 디지털 브이씨알의 변속 재생 방법.A first step of estimating the GOP length in the initial constant speed playback section and determining whether the mode is in the constant speed playback mode; a second step of performing constant speed playback in the first step; and a GOP if the speed playback mode is determined in the first step A third step of skipping and performing constant speed playback by the number of tracks 'N' of the speed range calculated from the length and the number of tracks 'P' of the constant speed section, and determining whether the shifting is the end of the shift playback; Otherwise, the fourth step of repeating the third step is performed by re-estimating the GOP length to calculate the track number 'N' in the double speed section and the track number 'P' in the constant speed section. How to play shift. 제1항에 있어서, 변속 재생이 고속 전진 재생이면 주행 방향으로 'N'개의 트랙을 스킵한 후 'P'개의 트랙을 정속 재생하고 I-픽쳐(picture)의 끝인지 판별하는 제1과정과, 제1과정에서 I-픽쳐(picture)의 끝이면 I-픽쳐(picture)의정지 상태로 표시하고 고속 전진 재생의 끝인지 판별하는 제2과정과, 제2과정에서 고속 전진 재생의 끝이 아니면 GOP 길이를 재추정하여 배속 구간의 트랙수 'N'과 정속 구간의 트랙수 'P'를 다시 산출하여 상기 제2과정을 반복 수행하고 고속전진 재생의 끝이면 재생 동작을 중시하는 제3과정으로 이루어진 것을 특징으로 하는 디지털 브이씨알의 변속 재생 방법.The method of claim 1, further comprising: a first process of skipping 'N' tracks in the driving direction and performing constant speed playback of 'P' tracks and determining whether it is the end of an I-picture if the shift reproduction is a fast forward playback; In the first step, if the end of the I-picture (picture) is the end of the I-picture (picture), the second step of determining whether the end of the fast forward playback, and if the end of the fast forward playback in the second process GOP Re-estimating the length to calculate the number of tracks 'N' in the double speed section and the number of tracks 'P' in the constant speed section to repeat the second process, and when the end of the fast forward playback is completed, The variable speed reproduction method of the digital V's characterized by the above-mentioned. 제1항에 있어서, 변속 재생이 고속 후진 재생이면 역주행 방향으로 'N'개의 트랙을 스킵한 후 'P'개의 트랙을 정속 재생하고 I-픽쳐(picture)의 끝인지 판별하는 제1과정과, 제1과정에서 I-픽쳐(picture)의 끝이면 I-픽쳐(picture)의 정지 상태로 표시하고 고속 후진 재생의 끝인지 판별하는 제2과정과, 제2과정에서 고속 후진 재생의 끝이 아니면 GOP 길이를 재추정하여 배속 구간의 트랙수 'N'과 정속 구간의 트랙수 'P'를 다시 산출하여 상기 제2과정을 반복 수행하고 고속 전진 재생의 끝이면 재생 동작을 중지하는 제3과정으로 이루어진 것을 특징으로 하는 디지털 브이씨알의 변속 재생 방법.The method of claim 1, further comprising: a first step of skipping 'N' tracks in the reverse driving direction and performing constant speed playback of the 'P' tracks and determining whether the end of the I-picture is performed when the shift playback is a fast backward playback; In the first process, if the end of the I-picture is displayed, the second process of displaying a still state of the I-picture and determining whether it is the end of the fast backward playback; And recalculating the length of the track number 'N' in the double speed section and the number of tracks 'P' in the constant speed section, repeating the second process, and stopping the playback operation at the end of the fast forward playback. The variable speed reproduction method of the digital V's characterized by the above-mentioned. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940035100A 1994-12-19 1994-12-19 Variable speed reproducing method of digital vcr KR0139753B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940035100A KR0139753B1 (en) 1994-12-19 1994-12-19 Variable speed reproducing method of digital vcr

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Application Number Priority Date Filing Date Title
KR1019940035100A KR0139753B1 (en) 1994-12-19 1994-12-19 Variable speed reproducing method of digital vcr

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KR960025596A true KR960025596A (en) 1996-07-20
KR0139753B1 KR0139753B1 (en) 1998-07-15

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KR1019940035100A KR0139753B1 (en) 1994-12-19 1994-12-19 Variable speed reproducing method of digital vcr

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