Video blanking circuit

Details Video blanking circuit Video blanking circuit

1976-08-18

1977-07-26

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 514

Patent

active

040386872

ABSTRACT:
A video blanking circuit is provided which inserts a system blanking interval signal having controlled leading and trailing edges into a video signal. The blanking signal is combined with a clamped video signal in a first non-additive mixer which also provides a white clip level. The output of the first non-additive mixer is further coupled to a second non-additive mixer in which black level excursions are clipped so as to provide an output video signal having a proper system blanking interval into which synchronizing information may be added to complete the composite video waveform.

REFERENCES:
patent: 3371160 (1968-02-01), Hurford
patent: 3739092 (1973-06-01), Legler

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