Video signal encoding

Details Video signal encoding Video signal encoding

1977-08-18

1978-11-14

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 712

Patent

active

041258614

ABSTRACT:
When a video signal is encoded using differential pulse code modulation (DPCM) techniques, the frequency of occurrence of the various quantizer output or representative levels is non-uniform; usually, low levels occur more frequently than high levels, and this characteristic can be used to advantage by applying the DPCM output to a variable length encoder before transmission. The present invention increases this advantage by intentionally forcing the quantizer output to particular levels when doing so is not harmful to the picture fidelity. By so doing, the entropy of the encoded signal is reduced by as much as 25 percent.

REFERENCES:
patent: 3621397 (1971-11-01), Morotani et al.
patent: 3699446 (1972-10-01), Sainte-Beuve
patent: 3784737 (1974-01-01), Waehner
patent: 3824590 (1974-07-01), Limb
patent: 3833900 (1974-09-01), Bahl et al.
patent: 3971987 (1976-07-01), Carrubba et al.
patent: 3973199 (1976-08-01), Widmer
patent: 4005411 (1977-01-01), Morrin

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