Interference signal suppressor for a radio receiver

Details Interference signal suppressor for a radio receiver Interference signal suppressor for a radio receiver

1986-04-25

1989-10-31

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455302, 455304, H04B 116

Patent

active

048782513

ABSTRACT:
An FM interference suppressor comprises two FM demodulators, one of which is fed with an input signal via an envelope detector and is arranged to feed a zero frequency detector and a phase inverter to produce a baseband composite signal comprising wanted and unwanted modulation. The other FM demodulator is fed directly with an input signal directly to produce a baseband signal comprising the unwanted modulation alone. A combiner is provided for subtractively combining the baseband signal and the baseband composite signal to produce the wanted modulation signal.

REFERENCES:
patent: 2654885 (1953-10-01), Wilmotte
patent: 2744247 (1956-05-01), Wilmotte
patent: 3092776 (1963-06-01), Castellini
patent: 3287645 (1966-11-01), Baghdady
patent: 4166251 (1979-08-01), Ishigaki et al.
patent: 4397039 (1983-08-01), McAuliffe
patent: 4651107 (1987-03-01), Akaiwa

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