Receiver interference suppression system

Details Receiver interference suppression system Receiver interference suppression system

1986-05-22

1988-04-19

Masinick, Michael A.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455303, 455308, 455311, 455305, H04B 110

Patent

active

047395184

ABSTRACT:
A radio receiver circuit which suppresses an interfering signal exhibiting an amplitude significantly greater than that of a desired signal and a frequency nearly the same as that of the desired signal is disclosed. A received signal is applied to a gain controlled amplifier and a limiter. The limiter provides a limited signal which reduces amplitude and power of the desired signal relative to the interfering signal. The gain controlled amplifier provides a constant amplitude signal at an amplitude where the interfering signal portion of the constant amplitude signal equals an amplitude of the interfering signal portion of the limited signal. The constant amplitude and limited signals combine through a subtraction operation resulting in a significant attenuation of the interfering signal while causing only a small attenuation of the desired signal. Switching and decision circuitry are provided to selectively utilize the interference suppression.

REFERENCES:
patent: 2394544 (1946-02-01), Gottier
patent: 3911366 (1975-10-01), Baghdady
patent: 4053932 (1977-10-01), Yamaguti et al.
patent: 4088955 (1978-05-01), Baghdady
patent: 4135159 (1979-01-01), Kubanoff
patent: 4249261 (1981-02-01), Ogita
patent: 4270223 (1981-05-01), Marston
patent: 4328591 (1982-05-01), Baghdady
patent: 4361881 (1982-11-01), Clemens

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