Synchronizing circuit having a variable bandpass filter

Details Synchronizing circuit having a variable bandpass filter Synchronizing circuit having a variable bandpass filter

1974-10-24

1976-01-06

Murray, Richard

Telegraphy

Systems

Simplex-reversing periodic

178 695TV, H04N 504

Patent

active

039314677

ABSTRACT:
In a television receiver, an automatic phase control includes a phase detector which generates a control signal passed by a bandpass filter to a horizontal oscillator in order to synchronize locally generated horizontal pulses with the received horizontal sync pulses. A keyed AGC circuit in response to increased received signal strength decreases the gain of the RF and IF amplifying stages. When the received signal strength reaches a preselected level, as occurs during off-the-air signal reception, the AGC signal actuates a transistor switch which widens the passband of the filter in order to increase the ability to lock onto irregular sync signals.

REFERENCES:
patent: 2848537 (1958-08-01), Richman
patent: 2962666 (1960-11-01), Pollak
patent: 3715499 (1973-02-01), Steckler
patent: 3795762 (1974-03-01), Willis

Affiliated with

Also associated with

Rating

Synchronizing circuit having a variable bandpass filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Synchronizing circuit having a variable bandpass filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Synchronizing circuit having a variable bandpass filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2350964