Composite video signal limiter

Details Composite video signal limiter Composite video signal limiter

1981-06-29

1983-05-17

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 40, 358316, 358318, H04N 9493, H04N 9535

Patent

active

043843026

ABSTRACT:
A filter separates a composite video input signal into luminance and chrominance signal components. The luminance signal component is limited to a range of values defined by first and second reference signals. Excursions in either sense of the chrominance signal component are limited to the lesser of two control signals, one control signal being proportional to a potential difference between the limited luminance signal and the first reference signal, the other control signal being proportional to a potential difference between the limited luminance signal and the second reference signal. The limited luminance and limited chrominance signals are combined to provide a composite video output signal limited to the range defined by the reference signals and in which the chrominance component thereof is symmetrically limited with respect to the luminance component thereof, thereby reducing distortion of the chrominance component of the composite output signal under limiting conditions.

REFERENCES:
patent: 3872498 (1975-05-01), Pritchard
patent: 3934263 (1976-01-01), Palmer
patent: 3966010 (1976-12-01), Kawamoto
patent: 4005474 (1977-01-01), Keizer
patent: 4022968 (1977-05-01), Keizer
patent: 4316213 (1982-02-01), Wharton et al.

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