Automatic color level circuit with peak detector

Details Automatic color level circuit with peak detector Automatic color level circuit with peak detector

1973-11-02

1976-02-03

Griffin, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

325410, 330 29, H04N 9535

Patent

active

039368696

ABSTRACT:
A color television receiver includes an automatic chroma control (ACC) system and a switch selectable manual color level potentiometer and a closed loop automatic color level limiter (ACL) with a preset color level potentiometer. The ACL loop is of the sample-and-hold type and includes a peak detector for detecting chroma signals in excess of a predetermined threshold level and a transistor for controlling the preset color level potentiometer for adjustment of the chroma amplifier gain. A relatively small capacitor is connected across the collector and base of the transistor and, in conjunction with a bias resistor, presents a relatively long time constant by reflecting a magnified input capacitance between its base and emitter electrodes due to the Miller effect. In the event the transistor is driven to cutoff during periods when the switch is in the manual position, the input capacitance is very small enabling the ACL circuit to recover quickly.

REFERENCES:
patent: 3281686 (1966-10-01), Cochran
patent: 3740462 (1973-06-01), Harwood
patent: 3764734 (1973-10-01), Srivastava et al.

Affiliated with

Also associated with

Rating

Automatic color level circuit with peak detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic color level circuit with peak detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic color level circuit with peak detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2126307