Clamp circuit for a video signal processor

Details Clamp circuit for a video signal processor Clamp circuit for a video signal processor

1986-03-27

1988-01-26

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 34, 358172, H04N 518

Patent

active

047220066

ABSTRACT:
A capacitor is provided between an amplifier whose output impedance is relatively high and a cathode of a cathode ray tube. A transistor is also provided having an emitter-collector path connected in parallel with said capacitor and a base electrode which is connected to a D.C. voltage source through a switch which is turned on during a horizontal retrace period and off during a horizontal scan period. A D.C. restoring operation is achieved by causing almost all of the discharge current of the capacitor to flow through the emitter-collector path, resulting in less discharge current flow through the output impedance of the amplifier.

REFERENCES:
patent: 3013116 (1961-12-01), Sziklai
patent: 4070691 (1978-01-01), Smith
patent: 4285008 (1981-08-01), Osawa
patent: 4328514 (1982-05-01), Nakashima

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