Periodically biased video disc player servo system

Details Periodically biased video disc player servo system Periodically biased video disc player servo system

1979-08-20

1981-08-25

Cook, Daryl W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

3581286, H04N 5795

Patent

active

042862825

ABSTRACT:
Periodic biasing of video disc player signal correction servo to the center of its control range avoids the loss-of-loop gain which otherwise could occur if the servo were continuously biased and minimizes loop stabilization time. Periodic biasing is provided by means of a timing circuit, responsive to a luminance signal transition above blanking level, which enables the servo phase error detector and simultaneously enables a precharging circuit which charges the servo error voltage holding capacitor to a level corresponding to a zero error servo condition. The timing circuit disables the precharging circuit a predetermined time subsequent to an opposite transition of the luminance signal and disables the phase detector subsequent to disabling of the precharging circuit. The period between disabling of the precharging circuit and disabling of the phase detector encompasses the color burst interval of the horizontal sync pulse and may be controlled by selection of offset and slope parameters of an integrator in the timing circuit.

REFERENCES:
patent: 3614305 (1971-10-01), Hidaka et al.
patent: 3629491 (1971-12-01), Dann et al.
patent: 3873764 (1975-03-01), Boltz, Jr.
patent: 3949418 (1976-04-01), Srivastava
patent: 3965482 (1976-06-01), Burrus
patent: 3974520 (1976-08-01), Kuroyanagi
patent: 4157565 (1979-06-01), Kuniyoshi et al.
patent: 4196445 (1980-04-01), Okada et al.

Affiliated with

Also associated with

Rating

Periodically biased video disc player servo system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Periodically biased video disc player servo system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Periodically biased video disc player servo system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1161704