Noise reduction circuit for reducing noise in a color signal of

Details Noise reduction circuit for reducing noise in a color signal of Noise reduction circuit for reducing noise in a color signal of

1984-04-04

1986-09-16

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

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358 37, H04N 964

Patent

active

046125701

ABSTRACT:
A noise reduction circuit is designed to eliminate noise in a color signal of a color video signal without introducing distortion in the waveform of the color signal. The noise reduction circuit is especially designed to eliminate the noise included in a high-frequency component of the color signal. A first circuit passes as an output thereof a signal obtained from the high-frequency component during a time period which is in accordance with a point in a luminance signal of the color video signal where a change in luminance occurs. A second circuit adds the output of the first circuit with the color signal from which the high-frequency component has been eliminated, so as to produce a color signal from which the noise has been substantially eliminated.

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patent: 4435725 (1984-03-01), Nagao et al.
patent: 4558353 (1985-12-01), Hirota
patent: 4563704 (1986-01-01), Hirota

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