| 摘要 |
<p>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.</p> |
