Television – Bandwidth reduction system – Data rate reduction
Patent
1994-06-23
1996-12-17
Sniezek, Andrew L.
Television
Bandwidth reduction system
Data rate reduction
3602732/, H04N 712, G11B 502, G11B 500
Patent
active
055858554
ABSTRACT:
A digital video signal coding circuit has a first DCT circuit for DCT converting a digital video signal with respect to frame and second DCT circuit for DCT converting the digital video signal with respect to fields which is used to reduce high frequency component of image. These outputs are selected according to high frequency components. The selected signal is separated to two signals respectively coded with data compression through VLC circuits which are provided to speed up the processing speed with non-industrial use ICs. A helical scan video tape recorder records the digital video signal such that at a lower portion (width direction) of slant track on a video tape, video data of an upper screen portion of the first field is recorded, at an upper portion of the track, video data of the upper screen portion of the second field is recorded, at a lower portion of the next slant track, video data of a lower screen portion of the first field is recorded, and at an upper portion, video data of the lower screen portion of the second field is recorded. This provides favorable image on a searching mode.
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Signal Processing of HDTV, III, Sep. 1991, Turin, It, pp. 547-554, XP000379993, Stammnitz et al --Hardware Implementation of a Codec for Digital HDTV Recording`.
Signal Processing of HDTV, III, Sep. 1991, Turin, It, pp. 523-530, XP000379990, Chiang et al --Compatible Coding of Digital Interlaced HDTV Using Prediction of the Even Field from the Odd Field`.
Mori Masaki
Otani Minoru
Ozaki Hidetoshi
Neal Regina Y.
Sniezek Andrew L.
Victor Company of Japan Ltd.
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