Color television receiver AFPC circuit

Details Color television receiver AFPC circuit Color television receiver AFPC circuit

1978-11-06

1981-03-10

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 23, H04N 946

Patent

active

042557593

ABSTRACT:
A color television receiver includes an automatic phase control circuit (which will be hereinafter referred to simply as an APC circuit) with a voltage controlled oscillator for controlling the phase of a reference carrier supplied to a color demodulator so that the phase and frequency of the reference carrier are locked to those of a color burst signal. In addition to the APC circuit, an auxiliary frequency control loop drives the frequency of the voltage controlled oscillator until its frequency falls within the lock-in range of the APC loop. The auxiliary frequency control loop includes a counter circuit for counting cycles of the output signal of the voltage controlled oscillator during a reference time interval and a decoding circuit for decoding the output of the counter circuit to produce an auxiliary control signal for frequency control of the voltage controlled oscillator.

REFERENCES:
patent: 3637936 (1972-01-01), Krause
patent: 4090215 (1978-05-01), Buchan et al.
patent: 4127866 (1978-11-01), Yamashita
patent: 4157565 (1979-06-01), Kumiyoshi et al.

Affiliated with

Also associated with

Rating

Color television receiver AFPC circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Color television receiver AFPC circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Color television receiver AFPC circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1297137