Noise responsive automatic peaking control apparatus

Details Noise responsive automatic peaking control apparatus Noise responsive automatic peaking control apparatus

1981-07-30

1983-03-15

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358167, 358 36, 358 38, H04N 514

Patent

active

043769527

ABSTRACT:
Apparatus is described for automatically depeaking the luminance signal of a television receiver under high noise conditions to improve the subjective appearance of reproduced images. Noise accompanying the luminance signal is sensed by bandpass filtering the signal and applying the filtered signal to a detector via a sampling circuit. The sampling circuit is enabled only during the horizontal blanking interval of the luminance signal to reject the active video portions of the luminance signal. The detector is of the pulse averaging type wherein pulses representative of peaks of the sampled signal above a threshold level are generated and averaged to produce a smoothed control signal that is principally representative of the noise and substantially independent of luminance signal transitions which occur during the sampling interval. The control signal is applied to a peaking control circuit in the receiver in a sense to vary the luminance signal peaking inversely with changes in the noise level whereby the luminance signal is automatically depeaked under high noise conditions.

REFERENCES:
patent: 3919714 (1975-11-01), Bingham
patent: 3971064 (1976-07-01), Milbourn
patent: 3984631 (1976-10-01), Avicola
patent: 4081836 (1978-03-01), Skinner
patent: 4090217 (1978-05-01), Goyal et al.
patent: 4189755 (1980-02-01), Babbes et al.

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