发明名称 |
Noise removing apparatus in an FM receiver |
摘要 |
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.
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申请公布号 |
US4480335(A) |
申请公布日期 |
1984.10.30 |
申请号 |
US19820374887 |
申请日期 |
1982.05.04 |
申请人 |
SANYO ELECTRIC COMPANY LTD.;TOKYO SANYO ELECTRIC CO. |
发明人 |
KISHI, HIROYASU |
分类号 |
H03G3/34;H04B1/10;(IPC1-7):H04B1/10 |
主分类号 |
H03G3/34 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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