Television – Bandwidth reduction system – Data rate reduction
Patent
1994-08-25
1995-11-21
Britton, Howard W.
Television
Bandwidth reduction system
Data rate reduction
348405, 348408, H04N 750
Patent
active
054692130
ABSTRACT:
In the time-varying image signal coding apparatus, a local encoded signal is quantized by a quantizing circuit, and the quantized signal is selected when refreshing is to be accomplished, and subjected to code transform by a code transform circuit to be transmitted to a time-varying image signal decoding apparatus. The signal supplied from the quantizing circuit is a transform coefficient in the transform region, and this is divided into a plurality of groups to be refreshed on a group-by-group basis. The transfer control on a group-by-group basis when refreshing is to take place is accomplished with a control signal supplied from a switching control circuit, and this control signal also undergoes code transform by the code transform circuit to be transmitted to the time-varying image signal decoding apparatus. In the time-varying image signal decoding apparatus, in accordance with the switching control signal transmitted from the time-varying image signal coding apparatus, refreshing is achieved by such selection that the transform coefficient to be refreshed is directly written into a frame memory from a code inverse transform circuit.
When a time-varying image signal is to be transferred by using interframe transform and transform coding, grouping is achieved by the units of transform coefficient, and frames are rewritten with each group independent of others.
REFERENCES:
patent: 4833535 (1989-05-01), Ozeki
S. Okubo et al., "International Standardization of Video Codecs for ISDN Videoconferencing and Videophone Services", MTT Review, vol. 2, No. 3, May 1990, pp. 110-117.
Koga Toshio
Okajima Masayuki
Britton Howard W.
NEC Corporation
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