Television – Bandwidth reduction system – Data rate reduction
Patent
1993-03-11
1994-12-27
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
348402, H04N 7137
Patent
active
053769686
ABSTRACT:
Digital video signals are adaptively compressed for communication to a receiver. Superblocks, each containing a plurality of blocks of digital video data, are compressed using PCM, DPCM with a general motion vector for the entire superblock, and DPCM with a specific motion vector for each block contained within a superblock. The result of each compression mode is compared after accounting for overhead data, to determine which results in the least amount of data for each block. These blocks are assembled into a superblock, and compared together with necessary overhead and motion vector data to the same superblock processed using all PCM as well as the superblock processed using all DPCM. The comparison determines which compression mode produces the least amount of data for the superblock. The most compact superblock is selected for transmission. The transmitted superblocks are decoded by a decoder that recovers the necessary motion vectors and overhead information which identifies the type of compression used to provide the superblock.
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Krause Edward A.
Paik Woo H.
Wu Allen
Chin Tommy P.
General Instrument Corporation
Lee Richard
Lipsitz Barry R.
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