Tuner with phase locked loop synthesizer

Details Tuner with phase locked loop synthesizer Tuner with phase locked loop synthesizer

1978-10-16

1981-01-06

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455183, 455194, H04B 110, H04B 126

Patent

active

042440556

ABSTRACT:
A PLL tuning device in a receiver uses a digital memory board and array of photo-transistors scanning the memory board for station selection. When the transistors are lined up with a column, a digital output is fed to a switching device and to a programmable frequency divider. Muting action is released when the output is delivered to the divider, but, when the array is between columns, muting action takes place. In one embodiment, the photo-transistor output is fed to a latch and to an OR gate serving as the switch. A one-shot is triggered in response to the setting of the OR gate at an H level. Digital information is fed to the programmable frequency divider from the latch until the one-shot is fired. In another embodiment, the latch and one-shot are eliminated. Photo-transistor output is fed to both an OR gate and the frequency divider. The OR gate controls a switch that closes muting switches only when information is being generated by the photo-transistors. However, when the sensor array is between signals the tuner is maintained in a muted state.

REFERENCES:
patent: 3437936 (1969-04-01), Tompson
patent: 3707597 (1972-12-01), Lunn
patent: 3927376 (1975-12-01), Ferrie
patent: 3962641 (1976-06-01), Suwa
patent: 4131853 (1978-12-01), Dreiske
patent: 4163203 (1979-07-01), Morii et al.
patent: 4170760 (1979-10-01), Umeda

Affiliated with

Also associated with

Rating

Tuner with phase locked loop synthesizer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Tuner with phase locked loop synthesizer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tuner with phase locked loop synthesizer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-288771