Receiver capable of quickly suppressing defective effect of mult

Details Receiver capable of quickly suppressing defective effect of mult Receiver capable of quickly suppressing defective effect of mult

1990-11-13

1993-04-20

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455222, 455297, 455311, H04B 110

Patent

active

052049736

ABSTRACT:
A FM receiver quickly suppressing defective effect of multipath reflection interference is disclosed. A field strength detecting circuit (8) is responsive to output signals from preceding stage amplifiers (51) in an IF amplifying circuit (5) for detecting the field strength of the received signal. In response to the field strength detecting circuit (8), a soft muting control circuit (10) is operated, whereby a muting circuit (7) gradually mutes the output signal of a detector circuit (6). Furthermore, an alternate current signal detecting circuit (12) detects the alternate current signal component included in the output signal from the field strength detecting circuit (8), whereby the occurrence of multipath reflection interference is detected. In the case of multipath reflection interference, the gain of the succeeding stage amplifier (52) in the IF amplifying circuit (5) is quickly reduced by the alternate current signal detecting circuit (12) to prevent unpleasant noise due to multipath reflection interference from being generated from the speaker.

REFERENCES:
patent: 3982186 (1976-09-01), Furuno
patent: 4283793 (1981-08-01), Numata
patent: 4390749 (1983-06-01), Pearson
patent: 4403348 (1983-09-01), Leland et al.
patent: 4426727 (1984-01-01), Hamada
patent: 4466129 (1984-08-01), Skutta
patent: 4703501 (1987-10-01), Sugai et al.
patent: 4881274 (1989-11-01), Tazaki et al.
Patent Abstracts of Japan, vol. 5, No. 55 (E-52) dated Apr. 16, 1981 and JP-A-56 006 542 dated Jan. 23, 1981.
Patent Abstracts of Japan, vol. 6, No. 251 (E-147) dated Dec. 10, 1982 and JP-A-57 033 834.
Patent Abstracts of Japan, vol. 6, No. 103 (E-112) dated Jun. 12, 1982 and JP-A 57 033 834.

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