Noise removing apparatus in an FM receiver

Details Noise removing apparatus in an FM receiver Noise removing apparatus in an FM receiver

1982-05-04

1984-10-30

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455219, 455222, 455225, 381 13, H04B 110

Patent

active

044803354

ABSTRACT:
A noise removing apparatus in an FM receiver includes a high-pass filter (29) receiving an output from an FM detector circuit (11), a gate (15) being interrupted in response to a pulsive noise detected by level-discriminating an output from a variable gain amplifier (35) receiving an output from the high-pass filter (29). Transistors are provided for controlling the gain of the variable gain amplifier (35) according to the magnitude of a terminal voltage of a capacitor which is charged according to an output from a rectifying circuit (43). The noise removing apparatus further includes a voltage generator (51) for generating a voltage proportional to a received electric field strength and a circuit (53) for varying an amount to be charged in the capacitor according to the magnitude of a voltage from the voltage generator (51) for maintaining the gain of the variable gain amplifier (35) large at the time of strong electric field, so that a multipath noise can be effectively removed.

REFERENCES:
patent: 3673499 (1972-06-01), Avins et al.
patent: 4066845 (1978-01-01), Kishi
patent: 4191850 (1980-03-01), Tanada
patent: 4245348 (1971-01-01), Imazeki
patent: 4356350 (1982-10-01), Ienaka
patent: 4356568 (1982-10-01), Ogita et al.

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