发明授权
- 专利标题: Automatic fine tuning defeat circuit
- 专利标题(中): 自动微调失败电路
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申请号: US494637申请日: 1974-08-05
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公开(公告)号: US3939427A公开(公告)日: 1976-02-17
- 发明人: David J. Mueller
- 申请人: David J. Mueller
- 申请人地址: IL Franklin Park
- 专利权人: Quasar Electronics Corporation
- 当前专利权人: Quasar Electronics Corporation
- 当前专利权人地址: IL Franklin Park
- 主分类号: H03J7/02
- IPC分类号: H03J7/02 ; H03J7/12 ; H04B1/16
摘要:
An automatic fine tuning defeat circuit disables the application of an automatic fine tuning or automatic frequency control correction voltage to the voltage-controlled tuners of a television receiver during switching from one channel to another. The tuning voltage for a selected channel is coupled in series with the automatic frequency control voltage to provide a composite tuning voltage for the tuners. During a channel change, a switch is rendered conductive to shunt or short-circuit the output of the automatic frequency control circuit, thereby rendering its output ineffective for control of the tuners during channel change. Upon completion of the channel change, the automatic frequency control circuit output voltage again is applied in series with the tuning voltage to form the composite tuning voltage for the tuners.
公开/授权文献
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