发明授权
- 专利标题: Electronic channel selection apparatus with surface acoustic wave device
- 专利标题(中): 具声表面波装置的电子通道选择装置
-
申请号: US247268申请日: 1981-03-25
-
公开(公告)号: US4392249A公开(公告)日: 1983-07-05
- 发明人: Shigeo Matsuura , Ikuo Yuki
- 申请人: Shigeo Matsuura , Ikuo Yuki
- 申请人地址: JPX Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX55-36867 19800325
- 主分类号: H03J7/18
- IPC分类号: H03J7/18 ; H03J7/28 ; H04B1/26 ; H03J7/26
摘要:
There is disclosed an electronic selection apparatus comprising a surface acoustic wave comb filter, in which the local oscillator frequency of an electronic tuner is swept up to a frequency higher than a peak frequency of the surface acoustic comb filter corresponding to a desired channel number (an upward direction), and then swept toward the opposite direction (a downward direction) until a predetermined number of peaks of the comb filter is counted while checking the presence of an AFC signal, whereby an erroneous tuning operation may be prevented, provided that the signal of the desired channel is present within a predetermined range in the vicinity of the receiving frequency of the desired channel.
公开/授权文献
信息查询