Compensated clamping circuit in a video signal peaking system

Details Compensated clamping circuit in a video signal peaking system Compensated clamping circuit in a video signal peaking system

1981-09-22

1983-05-31

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358172, H04N 514

Patent

active

043863698

ABSTRACT:
A television receiver includes means for generating a peaking component which is combined with a video signal to produce a peaked video signal, and a control circuit responsive to the peaked video signal during prescribed control intervals for automatically controlling a reference level of the video signal. The peaking component is attenuated during the control intervals to prevent the control network from responding to spurious signals including noise, which would otherwise be enhanced by the peaking generator and distort an output control voltage from the control circuit. In a system wherein the control circuit is arranged in a feedback loop with a peaking generator comprising a delay line, such attenuation also serves to stabilize the feedback control loop against oscillation.

REFERENCES:
patent: 4110790 (1978-08-01), Wheeler
patent: 4263616 (1981-04-01), Lee
patent: 4295435 (1981-10-01), d'Hautecourt
patent: 4316210 (1982-02-01), Wharton
patent: 4316214 (1982-02-01), Yost
patent: 4338630 (1982-07-01), Engel
Schematic circuit diagram (FIG. 31, pp. 39-40) for the RCA CTC-111 Color Television Receiver, as published in the RCA Television Service Data Bulletin (No. C-3, 1981) available from the RCA Consumer Electronics Division, Technical Publications.

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