Adaptive leak HDTV encoder

Details Adaptive leak HDTV encoder Adaptive leak HDTV encoder

1990-12-11

1992-07-28

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358136, 358 13, 375 27, H04N 712, H04N 1104

Patent

active

051344750

ABSTRACT:
In a differential PCM encoder, the problem of error perpetuation is solved by leaking a changing, rather than a fixed, fraction of the input signal to the differential PCM. The fraction leaked is sensitive to the characteristics of the signal. In one embodiment the fraction leaked is fixed for a frame in accordance with a chosen characteristic of the frame signal. In another embodiment, the fraction leaked is set in accordance with one function when a chosen characteristic of the frame signal exceeds a given level, and follows another function when the chosen characteristic does not exceed the chosen level. In a still another embodiment, the fraction leaked is set to one of two levels, based on a chosen characteristic of the frame signal.

REFERENCES:
patent: 4255763 (1981-03-01), Maxemchuk et al.
patent: 4703350 (1987-10-01), Hinman
patent: 4727422 (1988-02-01), Hinman
patent: 4794455 (1988-12-01), Ericsson
patent: 4866510 (1989-09-01), Goodfellow et al.
patent: 5040062 (1991-08-01), Knauer et al.
patent: 5043808 (1991-08-01), Knauer et al.
patent: 5063444 (1991-11-01), Knauer et al.
"Digital Pictures" by A. N. Netravali and B. G. Haskell, Plenum Press, 1988, pp. 334 et seq.

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