Apparatus for selectively dampening noises contained in Y signal

Details Apparatus for selectively dampening noises contained in Y signal Apparatus for selectively dampening noises contained in Y signal

1991-06-14

1993-01-05

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 36, H04N 521

Patent

active

051776014

ABSTRACT:
An apparatus for selectively dampening noises of received luminance signals for a video signal processing system. The apparatus comprises a level limiter for limiting amplitude levels of the luminance signals, a noise dampening processor connected to the level limiter, for dampening noises of the luminance signals resulted from a transmission channel to provide processed luminance signals, a buffer connected to the level limiter, for buffering the luminance signals to provide buffered luminance signals, an average detector for detecting average amplitude levels of the luminance signals to provide an average signal, a comparator for comparing the average signal to a reference signal to provide a control signal, a switch selector for selecting one of the control signal and an user'selected signal to provide a selected control signal, and a switch for enabling transmission of one of the processed luminance signals and the buffered luminance signals in dependence upon reception of the selected control signal.

REFERENCES:
patent: 4090221 (1978-05-01), Connor
patent: 4335400 (1982-06-01), Chow
patent: 4807032 (1989-02-01), Strehl
patent: 4851911 (1989-07-01), Muller
patent: 4882618 (1989-11-01), Tsuji
patent: 4985771 (1991-01-01), Sugimori
patent: 5019908 (1991-05-01), Su

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