FM receiver with improved adjacent-channel rejection

Details FM receiver with improved adjacent-channel rejection FM receiver with improved adjacent-channel rejection

1987-03-23

1989-08-08

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455209, 455316, 331 22, H04B 1500

Patent

active

048560855

ABSTRACT:
An FM receiver having a phase-locked loop demodulator and a control voltage correction circuit for the local tuning oscillator. The correction circuit includes a comparator for comparing the output frequency of the phase-locked loop demodulator with the output signal from a reference oscillator, the output of the comparator being connected through an integrator to provide a control signal for the local oscillator as part of an automatic frequency control loop. The comparator output is also fed through an integrator to an adder connected between the demodulator output and the demodulator oscillator controlled input, for setting the demodulator oscillator at the center intermediate frequency when no carrier signal is being received.

REFERENCES:
patent: 4198604 (1980-04-01), Holdaway
patent: 4395777 (1983-07-01), Oki et al.
patent: 4451930 (1984-05-01), Chapman et al.
patent: 4603304 (1986-07-01), Burns et al.
patent: 4653117 (1987-03-01), Heck

Affiliated with

Also associated with

Rating

FM receiver with improved adjacent-channel rejection does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with FM receiver with improved adjacent-channel rejection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and FM receiver with improved adjacent-channel rejection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-912304