Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1996-02-14
1996-12-10
Tran, Thai Q.
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
H04N 576, H04N 5783
Patent
active
055836518
ABSTRACT:
Video images are encoded by transform coding, resulting in data blocks each including a DC-coefficient and a plurality of AC-coefficients. The coefficients of a number of said transform blocks are variable-length encoded and transmitted. In order to avoid a complete loss of datablocks in case of a transmission error, the most significant codewords of a group of blocks are transmitted first so as to achieve that at least the DC-level of the blocks is likely to be retained. The coefficients may also be recorded on a videorecorder. Fast playback of recorded images so encoded, leads to very poor quality because some data blocks are not being read in the search mode. To improve this quality the DC-coefficients and if desired predetermined AC-coefficients of selected ones of the transform blocks to be recorded on one track are packed together to form a DC-packet and such packet is recorded on a selected part of the track. The DC-packet is chosen such that it can be read out as a unit at various search speeds, and can be read partially at higher search speeds.
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De With Peter H. N.
Keesman Gerrit J.
Nijssen Stephanus J. J.
Rijckaert Albert M. A.
Marion Michael E.
Nguyen Huy
Tran Thai Q.
U.S. Philips Corporation
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