发明授权
US4468537A Sound system having suppression of AM stereophonic receiving
circuit-induced noise
失效
具有抑制AM立体声接收电路引起的噪声的声音系统
- 专利标题: Sound system having suppression of AM stereophonic receiving circuit-induced noise
- 专利标题(中): 具有抑制AM立体声接收电路引起的噪声的声音系统
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申请号: US274613申请日: 1981-06-17
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公开(公告)号: US4468537A公开(公告)日: 1984-08-28
- 发明人: Tatsuo Numata , Akira Nishioka , Hitoshi Hirata
- 申请人: Tatsuo Numata , Akira Nishioka , Hitoshi Hirata
- 申请人地址: JPX Tokyo
- 专利权人: Pioneer Electronic Corporation
- 当前专利权人: Pioneer Electronic Corporation
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX55-83154 19800619
- 主分类号: H04B1/20
- IPC分类号: H04B1/20 ; H04B15/04 ; H04H1/00 ; H04H40/36 ; H04S1/00 ; H04H5/00
摘要:
A multi-function sound system including an AM stereophonic receiving function in which interference with operating circuits in modes other than the AM stereophonic mode is eliminated. A limiter receives a IF AM stereophonic received signal and removes the amplitude variation components therefrom and couples the resulting signal to a phase detector composed of a phase-locked loop which produces as an output signal a sub-signal. A switch is provided which deactivates both the limiter and the voltage-controlled oscillator in the phase-locked loop circuit when the sound system is set to other than the AM stereophonic receiving mode.
公开/授权文献
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