Black level clamp for television signals

Details Black level clamp for television signals Black level clamp for television signals

Filed on

1982-10-29

Date issued

1985-04-23

Examiner

Chin, Tommy P.

Patent Class

Facsimile and static presentation processing

SubClass

Facsimile

SubSubClass

Specific signal processing circuitry

Other Related Categories

H04N 518

Type

Patent

Status

active

Patent number

045133212

Description

ABSTRACT:
A black-level clamp for a signal derived from a transducer such as a camera tube includes a controllable voltage offset generator such as a series capacitor or an amplifier. The television signal is sampled during the horizontal sync interval to produce a control signal indicative of the current black-level signal, and the control signal is applied to adjust the charge on the series capacitor to place one plate at a reference voltage or is compared with a reference level to produce a further control signal for adjusting the offset of the amplifier. In either case, drift of the reference voltage which may perturb the operation of the clamp is reduced by deriving the reference voltage from the television signal at times within the vertical blanking interval.

REFERENCES:
patent: 4110787 (1978-08-01), Parker

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