发明授权
- 专利标题: Station selecting method for television receiver
- 专利标题(中): 电视接收机的选台方法
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申请号: US594661申请日: 1984-03-29
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公开(公告)号: US4594611A公开(公告)日: 1986-06-10
- 发明人: Kiyoshi Sugibayashi , Tomihiro Oguchi , Hiroyuki Takahori
- 申请人: Kiyoshi Sugibayashi , Tomihiro Oguchi , Hiroyuki Takahori
- 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: JPX58-51503 19830329
- 主分类号: H03J7/20
- IPC分类号: H03J7/20 ; H03J1/00 ; H03J7/02 ; H03J7/18 ; H04N5/50
摘要:
A method for tuning a television receiver in which an optimum local oscillator frequency is selected for offset stations. A local oscillator frequency of the receiver is incremented in steps of a first predetermined frequency interval beginning with a frequency at the bottom of an offset band around the center frequency of the local oscillator. As the local oscillator frequency is scanned, when both an up signal, indicative that the tuning frequency is above a predetermined range around the actual frequency of the received signal, and a down signal, indicative that the tuning frequency is below the predetermined range around the center frequency, the local oscillator is decremented by the first frequency interval and then incremented in a second, smaller frequency interval until the up and down signals are both lost. The local oscillator frequency is then increased and decreased by the first predetermined frequency interval, wherein, if both the up and down signals toggle states, the frequency at which both the up and down signals were lost when scanning with the second frequency interval is accepted as the best tuning frequency.
公开/授权文献
- USD242779S Ultrasonic intrusion alarm 公开/授权日:1976-12-21
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