Circuit arrangement for generating clamping pulses

Details Circuit arrangement for generating clamping pulses Circuit arrangement for generating clamping pulses

1985-07-17

1987-08-25

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 518

Patent

active

046896805

ABSTRACT:
A circuit arrangement for producing clamping pulses for a clamping circuit for the regeneration of the average picture luminance of a video signal wherein the synchronizing pulses are separated from the video signal by a clipping stage and applied to two monostable multivibrators. Line-frequency clock pulses are produced from the video signal pulses and the vertical blanking interval is detected with the aid of a counting circuit which is driven by the monostable multivibrators. This counting circuit always selects one of the two outputs of a further counting circuit, from which outputs clamping pulse signals are supplied at different instants.

REFERENCES:
patent: 3819859 (1974-06-01), Borsuk
patent: 4218706 (1980-08-01), Brinegar

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