Noise cancelling system for FM receiver

Details Noise cancelling system for FM receiver Noise cancelling system for FM receiver

1978-02-14

1980-03-25

Olms, Douglas W.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455213, H04H 500

Patent

active

041952030

ABSTRACT:
In a noise cancelling system for FM receivers, means is provided whereby a pilot signal of 19 KHz is always detected from a stereo composite signal, whether or not a noise canceller circuit is operated. The 19 KHz pilot signal is injected into a phase locked loop, and a signal of 38 KHz in synchronism with the 19 KHz pilot signal is generated which in turn is injected into the multiplex demodulation circuit. Furthermore, means may also be provided which eliminates, from the 19 KHz pilot signal, noise mixed into the stereo composite signal and having a frequency characteristic of (19
) KHz (n=1, 2, . . .) and then detects the foregoing pilot signal, thereby achieving satisfactory stereophonic separation.

REFERENCES:
patent: 3573382 (1971-04-01), Feit
patent: 3617641 (1971-11-01), Feit
patent: 3739285 (1973-06-01), Hepp
patent: 3919482 (1975-11-01), Hamada
patent: 4066845 (1978-01-01), Kishi

Affiliated with

Also associated with

Rating

Noise cancelling system for FM receiver does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Noise cancelling system for FM receiver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noise cancelling system for FM receiver will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1402884