Video processor employing variable amplitude compression of the

Details Video processor employing variable amplitude compression of the Video processor employing variable amplitude compression of the

1980-09-23

1982-02-16

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 4, 358 27, H04N 9493, H04N 938, H04N 9535

Patent

active

043162134

ABSTRACT:
A composite video signal is separated into luminance and chrominance components which are processed in separate channels having transfer functions which differ in terms of frequency response and large signal amplitude response. The luminance channel subjects the luminance signal to high frequency preemphasis and to hard limiting or clipping at predetermined fixed levels. The chrominance channel exhibits a substantially uniform amplitude response and a variable compression characteristic dependent upon the chrominance signal level, a sum of chrominance and processed luminance signals or a composite output signal formed by a sum of processed chrominance and processed luminance signals. The composite signal is suitable for application to a picture carrier frequency modulator whereby an FM signal is produced suitable for video disc or tape recording and in which a tendency for luminance-chrominance crosstalk or interference is minimized.

REFERENCES:
patent: 3934263 (1976-01-01), Palmer
patent: 4005474 (1977-01-01), Keizer
patent: 4007483 (1977-02-01), Pham van Cang
patent: 4022968 (1977-05-01), Keizer
patent: 4096513 (1978-01-01), Ross

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