Coded data generation or conversion – Digital code to digital code converters
Patent
1994-05-23
1995-03-07
Hoff, Marc S.
Coded data generation or conversion
Digital code to digital code converters
341 63, H03M 700
Patent
active
053962370
ABSTRACT:
In a subband coding device for coding a digital device input signal which is a one-dimensional or a two-dimensional signal, a single coding circuit is used instead of a conventional combination of coders and a multiplexer. The coding circuit is for coding subband samples of different frequency bands in each sample group across the frequency bands, as by starting from a lowest frequency band and ending at a highest frequency band or reversedly, and preferably with attention directed to correlation which the subband samples have between two adjacent frequency bands. Zero-level components of the subband samples are preferably run-length coded. When the subband samples of each sample group have a tree structure including subtrees, the subband samples are preferably scanned from a subtree to another subtree either starting at or ending at the subband sample of the lowest frequency band.
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patent: 4956871 (1990-09-01), Swaminathan
patent: 4963030 (1990-10-01), Makur
patent: 5010405 (1991-04-01), Schreiber et al.
patent: 5115240 (1992-05-01), Fujiwara et al.
patent: 5150387 (1992-09-01), Yoshikawa et al.
patent: 5151941 (1992-09-01), Nishiguchi et al.
patent: 5161210 (1992-11-01), Druyvesteyn et al.
Hoff Marc S.
NEC Corporation
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