Method and apparatus for encoding and decoding a binary digital

Details Method and apparatus for encoding and decoding a binary digital Method and apparatus for encoding and decoding a binary digital

1982-10-29

1985-07-23

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

340347DD, 358 11, 358 13, H04N 516

Patent

active

045311536

ABSTRACT:
A system of encoding an original binary digital video signal comprised of a plurality of first 8-bit words having an absolute value and a digital sum variation, to produce an encoded binary digital video signal, converts each first 8-bit word into a second 8-bit word also having an absolute value and a digital sum variation such that, with respect to predetermined groups of correlative first 8-bit words, that is, first 8-bit words having absolute values which are close to each other, second 8-bit words corresponding to the first 8-bit words in each respective group have the same digital sum variation; and then inverts every alternate m second 8-bit words, where m=1, 2, 3 . . . , to form the encoded binary digital video signal with substantially reduced DC content while maintaining the same recording bit rate.

REFERENCES:
patent: 3902117 (1975-08-01), Sheppard
patent: 4027335 (1977-05-01), Miller
patent: 4095259 (1978-06-01), Sawagata
patent: 4387364 (1983-06-01), Shirota
patent: 4408189 (1983-10-01), Betts

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