发明授权
- 专利标题： Front end circuits of FM receivers
- 专利标题（中）： FM接收机的前端电路
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申请号： US881277申请日： 1978-02-27
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公开(公告)号： US4225823A公开(公告)日： 1980-09-30
- 发明人: Minoru Ogita
- 申请人： Minoru Ogita
- 申请人地址： JPX Hamamatsu
- 专利权人： Nippon Gakki Seizo Kabushiki Kaisha
- 当前专利权人： Nippon Gakki Seizo Kabushiki Kaisha
- 当前专利权人地址： JPX Hamamatsu
- 优先权： JPX52-22658[U] 19770226; JPX52-72388[U] 19770603
- 主分类号： H03J3/00
- IPC分类号： H03J3/00 ; H04B1/18 ; H03H7/12
摘要：
The front end circuit is constituted by first and second signal paths for transmitting a high frequency signal received by an antenna, and a transfer switch for selecting either one of the signal paths depending upon the state of the received signal, and a circuit for converting the frequency of either one of the selected signals to an intermediate frequency signal. Two signal paths have different filtering attenuating and amplifying characteristics, thereby providing an optimum condition for either a local or distant reception of radio wave signals.
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