Clamping arrangement for a video signal peaking system

Details Clamping arrangement for a video signal peaking system Clamping arrangement for a video signal peaking system

1981-09-22

1983-05-31

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 37, 358172, H04N 514

Patent

active

043863701

ABSTRACT:
In a video signal processing system, an input capacitor AC couples video signals to a DC coupled video signal path, and to a DC coupled peaking signal path for generating a peaking component which is combined with video signals from the video path to develop a peaked video signal. A feedback control voltage for controlling the DC level of the video signal is stored by the input coupling capacitor, and is DC coupled to both the video path and the peaking path in a manner to reduce the likelihood of a DC offset error when the video signal and peaking component are combined. In an embodiment, the control voltage is coupled to the storage capacitor via a delay line included in the video path and which is coupled across the differential inputs of a differential amplifier with which the delay line coacts to generate the peaking component.

REFERENCES:
patent: 4110790 (1978-08-01), Wheeler
patent: 4263616 (1981-04-01), Lee
patent: 4296435 (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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