发明授权
- 专利标题： Receiver having a tuning circuit with a selectable input
- 专利标题（中）： 接收机具有可选输入的调谐电路
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申请号： US09366566申请日： 1999-08-04
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公开(公告)号： US06342928B1公开(公告)日： 2002-01-29
- 发明人: Koji Ohira
- 申请人： Koji Ohira
- 主分类号： H04N546
- IPC分类号： H04N546
摘要：
A receiver includes two input terminals. A VHF broadcast signal over a 6-MHz band channel is inputted through one input terminal, while an FM broadcast signal over an approximate 100-kHz band channel is inputted through the other input terminal. The other input terminal is connected with a trap circuit for band width reduction. This trap circuit causes attenuation in signal components over channels close to a desired channel except that over the desired channel with a band of approximately 100 kHz. An analog switch inputs selectively the VHF broadcast signal and the FM broadcast signal attenuated in the signal components to a tuning circuit having a tuning band width of approximately 6 MHz. When an FM broadcast signal is selected, an FM broadcast signal only over a desired channel is outputted from the tuning circuit.