Noise suppression circuit for use with FM receiver

Details Noise suppression circuit for use with FM receiver Noise suppression circuit for use with FM receiver

1977-09-08

1980-09-30

Safourek, Benedict V.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455214, 455228, 329130, 329140, H03D 308, H04B 110

Patent

active

042259754

ABSTRACT:
Two semiconductor diodes are serially interconnected across a ratio detector in the same polarity. When the detected output from the ratio detector reaches a predetermined magnitude, both diodes are conducting and the detected output is taken from the junction of the diodes. When the detected output from the ratio detector falls due to a lower received signal level, an increase in noise level is ordinarily experienced. Because the output of the ratio detector is lower, the diodes are no longer fully conductive. This causes an increase in output impedance and a corresponding reduction in noise output.

REFERENCES:
patent: 3217257 (1965-11-01), Boatwright
patent: 3265976 (1966-08-01), Broadhead, Jr.
patent: 3525943 (1970-08-01), Rinderle
patent: 3564435 (1971-02-01), Burgert
patent: 3609554 (1971-09-01), Stoker
patent: 3621409 (1971-11-01), Segawa
patent: 3622897 (1971-11-01), Tsugita
patent: 3902018 (1975-08-01), Fockens
IF and Detector Design for FM, TV & Radio Engineering, Aug.-Sep., 1953, pp. 18-22.

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