Code converting circuits

Details Code converting circuits Code converting circuits

1979-04-20

1981-06-30

Atkinson, Charles E.

Communications: electrical

Audible indication

Percussion-type sound producer

358133, 358261, H04N 712

Patent

active

042765447

ABSTRACT:
Code converting circuits for facsimile and other information communications systems in which run length codes are converted to codes having variable lengths and the variable length codes are converted into a word code train, wherein each word comprises N bits, and the converted word code train is stored or transmitted. The code converting circuit consists of a code converter for converting parallel input codes (run length codes of fixed lengths) into variable length codes, a multiplexer and shift register for converting the variable length codes (and dummy codes where needed) into word length codes of fixed length, a multiplexer for outputting the word length codes to a memory interjecting a synchronizing code at predetermined intervals, and control signal generating circuitry for controlling the various circuit components. A decoding circuit is also disclosed for reconstructing the original run length codes from the word length codes. In addition, a second embodiment is disclosed which uses a parallel signal processing technique and is particularly adapted for encoding and decoding television video signals.

REFERENCES:
patent: 3646257 (1972-02-01), Epstein et al.
patent: 4092665 (1978-05-01), Saran
patent: 4125746 (1978-11-01), Downey et al.
patent: 4131915 (1978-12-01), Nakagome et al.
patent: 4149192 (1979-04-01), Takeuchi
patent: 4185302 (1980-01-01), Mounts et al.

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