Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1997-08-21
2000-09-19
Nguyen, Huy
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
386116, 386124, H04N 576
Patent
active
061224359
ABSTRACT:
A digital recording and playback unit which prevents deterioration of reproduced video image due to confusion in servo control occurring at a chronologically discontinued portion in the recording at the time of playback when a wide head is used for reproducing assembled video data recorded in a narrow track width. The digital recording and playback unit include a decoding circuit for decoding the reproducing signal to digital playback data, an error correction circuit for restoring erroneous portions of the data decoded by the decoding circuit, a first frame memory used for making corrections by the error correction circuit, a deshuffling circuit for reassembling data restored by the error correction circuit, a second frame memory used for deshuffling by the deshuffling circuit, a detecting circuit for detecting a chronologically discontinued portion in the recording at the time of playback, and a control circuit for instructing writing and reading to and from the first and second frame memories based on the output of the detecting circuit. Helical scanning is employed and one frame of the video image consisting of multiple tracks is recorded in a track width of 2 W/3, where W is the width of a recording and playback head.
REFERENCES:
patent: 4318143 (1982-03-01), Kubota et al.
patent: 5483389 (1996-01-01), Karasawa
patent: 5583654 (1996-12-01), Oguro
patent: 5745318 (1998-04-01), Kubota et al.
Patent Abstracts of Japan; vol. 10, No. 141 (E-406) 2198!; May 24, 1986 & JP 61 003584 A (Matsushita Denki Sangyo K.K.); Jan. 9, 1986 *the whole document*.
Horikane Hiroshi
Izawa Masato
Matsushita Electric - Industrial Co., Ltd.
Nguyen Huy
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