Pilot signal cancelling circuit for FM multiplex demodulator

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

325436, H04H 500

Patent

active

040769631

ABSTRACT:
A pilot signal cancelling circuit for an FM multiplex demodulator wherein the amplitude of the cancelling signal tracks that of the pilot signal contained in or mixed into the composite signal. The amplified composite signal is synchronously detected with the fixed amplitude 19 KHz pilot signal extracted by a phase lock loop 2, and the detector output is filtered to remove high frequency components and then converted to a current variation in a d.c. amplifier 13. The output of the latter is fed to a current controlled attenuator 14 together with the fixed amplitude pilot signal, and the level adjusted attenuator output is then inverted, divided into left and right channel components by the 38 KHz sub-carrier signals, and fed to adders in the multiplex demodulator outputs to cancel the pilot signal components therein.

REFERENCES:
patent: 3235663 (1966-02-01), Plus et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Pilot signal cancelling circuit for FM multiplex demodulator does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

     

Profile ID: LFUS-PAI-O-1677728

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.