专利名称：AM/FM radio receiver
发明人：OHSAWA; MITSUO,ONOE; YUKIO申请号：US47701274申请日：19740606公开号：US3919645A公开日：19751111
摘要：An AM/FM radio receiver has an FM input circuit and an FM amplifier connectedto a rectifier circuit and has an AM input circuit and an AM intermediate frequencyamplifier also connected to the same rectifier circuit. Either AM intermediate frequencysignals or FM intermediate freuqency signals actuate the rectifier to produce a directcurrent signal, and the rectifier is connected to a tuning indicator so that the directcurrent signal actuates the indicator to identify correct tuning of either the AM inputcircuit or the FM input circuit. The rectifier is also connected to another circuit to controlan automatic mono-stereo switching circuit in the FM portion of the receiver to allowstereo operation if the incoming signal has a sufficiently high amplitude. The signal fromthe rectifier is also connected to a muting circuit to mute the output of the FM section ofthe receiver in the absence of any FM signals. The output of the rectifier is also
connected to a gain control circuit in the AM intermediate frequency amplifier to provideautomatic gain control of the AM section of the receiver.
申请人：SONY CORPORATION
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