Coding technique

Details Coding technique Coding technique

1983-05-18

1986-01-07

Shaw, Clifford C.

Communications: electrical

Audible indication

Percussion-type sound producer

358261, 375122, 382 56, H04N 712

Patent

active

045636710

ABSTRACT:
In a transmitter for image signals, a variable-length coder whose code set has been optimized for the order statistics of a run-length-coded bilevel image is used to code a stream of differential-pulse-code-modulated (DPCM) errors representing a multi-level image. The DPCM errors are first rearranged on a line-by-line basis in such a way that the rearranged error stream contains many long runs. Individual words in the rearranged error stream are then changed in such a way that, for at least one value of n, the n most-frequently-occurring words in the resulting, processed signal substantially have the aforementioned order statistics. The resulting signal is then run-length-coded, applied to the variable-length coder, and then transmitted. The reverse processing is performed at the receiver.

REFERENCES:
patent: 4185302 (1980-01-01), Mounts et al.
patent: 4409623 (1983-10-01), Kobayashi et al.
patent: 4476495 (1984-10-01), Fujisawa et al.
"Standardization of Group 3 Facsimile Apparatus for Document Transmission," CCITT Recommendation, 1981, pp. 222-235.

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