Video signal blanking interval signal conditioning circuit

Details Video signal blanking interval signal conditioning circuit Video signal blanking interval signal conditioning circuit

1986-04-29

1987-12-29

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358172, H04N 324, H04N 518

Patent

active

047164611

ABSTRACT:
A wideband video signal processing system includes a blanking interval signal conditioning circuit with reduced parasitic capacitance. The circuit has an AC coupling capacitor connected between an input buffer amplifier and an output buffer amplifier. A first keyed electronic switch of the single pole, single throw type is coupled in series between the output of the first buffer and the capacitor. A second keyed electronic switch of the single pole, single throw type is coupled between the output of the capacitor and a reference voltage. The first and second switches are keyed to establish a fixed video signal reference value during image blanking intervals.

REFERENCES:
patent: 4562475 (1985-12-01), Levine
Partial schematic circuit diagram of video monitor Model DC-1, manufactured by RCA Corp.
Partial schematic circuit diagram of video monitor Model CTVM 4, manufactured by Barco Corp.

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