Method and apparatus for maintaining the mean valves of video si

Details Method and apparatus for maintaining the mean valves of video si Method and apparatus for maintaining the mean valves of video si

1990-08-06

1992-11-24

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358164, H04N 712

Patent

active

051667908

ABSTRACT:
A video signal with pre-emphasis is applied via an input to an HD-MAC encoder, the encoded output being applied over a first path to an input of an adder. The encoded signal is also applied via a decoder and a further path comprising a de-emphasis circuit, a mean value estimator circuit and a pre-emphasis circuit, to an input of a difference circuit. The video signal from the encoder input is also applied to a second input to the difference circuit, via a reference path comprising components which correspond to the de-emphasis circuit, mean value estimator, and pre-emphasis circuit in the further path. The difference in the pre-emphasized mean values obtained from the difference circuit is applied via a shuffler and added to the video signal in the first path.

REFERENCES:
patent: 4774562 (1988-09-01), Chen et al.
patent: 4922342 (1990-05-01), Fonsalas
patent: 4935813 (1990-06-01), Fonsalas
patent: 4942466 (1990-07-01), Sandbank et al.
patent: 4965667 (1990-10-01), Trew et al.

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