Double-sideband, suppressed-carrier, signal injection apparatus

Details Double-sideband, suppressed-carrier, signal injection apparatus Double-sideband, suppressed-carrier, signal injection apparatus

1980-04-14

1982-02-02

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455310, H04B 110

Patent

active

043143768

ABSTRACT:
A system for automatically adjusting the threshold sensitivity of an FM receiver (muting) to prevent noise capture and reduce the effects of distortion due to multipath reception. A crystal controlled oscillator drives a suppressed carrier modulator which in turn delivers sideband signals at F/88 and -F/88, where F is the IF center frequency of 10.7 MH.sub.z. The sidebands are injected into the FM receiver between the IF amplifier output and the input of a quadrature detector (discriminator) and fall outside of the maximum .+-. excursion of FM modulation within the IF bandpass, but are separated from F by less than the adjacent channel spacing. Proper adjustment of the level of these sidebands prevents noise capture and reduces FM Multipath Distortion.

REFERENCES:
patent: 2395737 (1946-02-01), Hansell
patent: 2398793 (1946-04-01), Magnuski
patent: 2409139 (1946-10-01), Magnuski
patent: 2462224 (1949-02-01), Rheams
patent: 2525359 (1950-10-01), Koch
patent: 3356794 (1967-12-01), Felix

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