Circuit for regulating the color subcarrier amplitude in a video

Details Circuit for regulating the color subcarrier amplitude in a video Circuit for regulating the color subcarrier amplitude in a video

1993-01-15

1994-09-13

Groody, James J.

Television

Image signal processing circuitry specific to television

Chrominance signal amplitude control

348647, 358316, 358327, H04N 978

Patent

active

053473191

ABSTRACT:
A circuit for regulating the color subcarrier amplitude in a video recorder used with a television receiver which employs overscanning of the electron beams for different modes of operation includes a regulating circuit for providing a regulating voltage representative of the amplitude of the color subcarrier. The regulating circuit includes a variable time constant circuit for switching from a short time constant during the overscanning to a long time constant immediately prior to ending the overscanning to change the regulating voltage in response to changes in the time constant. A variable amplifier is responsive to the regulating voltage to regulate the amplification of the color subcarrier in response to changes in the time constant.

REFERENCES:
patent: 3806635 (1974-04-01), Abbott et al.
patent: 4148058 (1979-04-01), Harwood et al.
patent: 4417284 (1983-11-01), Sato
patent: 4485396 (1984-11-01), Sandberg

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