Front porch clamping circuit

Details Front porch clamping circuit Front porch clamping circuit

1978-12-21

1980-07-29

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 518

Patent

active

042153719

ABSTRACT:
A circuit is disclosed for establishing a reference level in a video signal which may include unwanted low frequency components. The circuit clamps the video signal to a selected level at a time corresponding to the front porch segment of the horizontal line synchronizing pulse. The clamping is carried out at the horizontal line rate, including during vertical blanking. A phase locked loop is employed to achieve synchronization with the front porch.

REFERENCES:
patent: 3003028 (1961-10-01), Suhrmann
patent: 3145263 (1964-08-01), Barnard
patent: 3246080 (1966-04-01), Ritchey, Jr.

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