Noise reduction circuit for composite color video signals

Details Noise reduction circuit for composite color video signals Noise reduction circuit for composite color video signals

1985-03-20

1987-05-19

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358167, H04N 964

Patent

active

046672257

ABSTRACT:
A noise reduction circuit for eliminating the noises contained in a composite color video signal, including a high-pass filter for extracting high-frequency components from composite color video signal, an amplitude limiter responsive to the high-frequency components to limit the amplitudes of these components, a phase inverter for inverting the phase of the output from the amplitude-limiter, a mixing network receiving both of the composite color video signal and the output from the phase inverter so that the noises contained in the former are substantially cancelled by the latter, wherein a notch filter is provided to attenuate signal components of a predetermined frequency contained in the input signal to the amplitude limiter to remove the chrominance component from the signal to be supplied to the amplitude limiter. The noise reduction circuit is useful especially in a composite color video reproduction system of a constant-line-velocity video disc player having special reproduction modes such as the still-motion, fast-feed and slow-motion modes.

REFERENCES:
patent: 4263619 (1981-04-01), Theriault
patent: 4291330 (1981-09-01), Hirai
patent: 4302768 (1981-11-01), Kamura
patent: 4376953 (1983-03-01), Naimpally

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