Radio receiver having phase locked loop and automatic frequency

Details Radio receiver having phase locked loop and automatic frequency Radio receiver having phase locked loop and automatic frequency

1981-01-22

1982-12-21

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455182, 455194, 455260, 455212, H04B 110, H04B 116

Patent

active

043653499

ABSTRACT:
A radio receiver comprises a phase locked loop and an automatic frequency control loop which are selectively coupled with a voltage-controlled local oscillator to control a local oscillator frequency. The phase locked loop and the automatic frequency control loop have a common loop filter which supplies the voltage-controlled oscillator with a control voltage. The loop filter is arranged so that its time constant may be switched from a small value to a great value in response to switching of the operation mode of the voltage-controlled oscillator from a phase locked loop control mode for the selection of broadcasting station to an automatic frequency control loop control mode for the maintenance of the local oscillator frequency after tuning of the radio receiver. The radio receiver can be arranged so that the local oscillator frequency may be maintained by the phase locked loop after the tuning of the receiver to a weak broadcast signal when muting control is rendered ineffective by a muting switch.

REFERENCES:
patent: 4078212 (1978-03-01), Rast
patent: 4121254 (1978-10-01), Morita et al.
patent: 4142158 (1979-02-01), Belisomi
patent: 4264977 (1981-04-01), Deiss

Affiliated with

Also associated with

Rating

Radio receiver having phase locked loop and automatic frequency does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-409548