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    • 11. 发明授权
    • VHF Television tuner circuit with supression of undesired signals
    • VHF电视调谐器电路,具有抑制不需要的信号
    • US4207549A
    • 1980-06-10
    • US910890
    • 1978-05-30
    • Katsuo ItoKazuo Kontani
    • Katsuo ItoKazuo Kontani
    • H04B1/18H03J5/24H03J5/28H04B1/26H03J5/00
    • H03J5/28
    • A VHF television tuner circuit is adapted for selecting a channel from a plurality of VHF television channels and a UHF/VHF converted television channel, by mechanical selection to form a resonant circuit having electrical characteristics corresponding to the selected channel. The tuner circuit is coupled to a VHF television signal terminal and a UHF/VHF converted television signal terminal. The tuner circuit comprises a channel selection means including a first switch and a second switch each comprising movable contacts fixedly positioned on a channel selection shaft and stationary contacts corresponding to the selectable channel positions and positioned in proximity to the movable contacts for coaction therewith. The first switch comprises a movable/stationary contact combination positioned in the vicinity of the VHF television signal terminal and responsive to selection of the UHF/VHF converted channel position for being grounded for electrostatically shielding the VHF television signal terminal. The second switch comprises a movable/stationary contact combination responsive to selection of the UHF/VHF converted channel position for connecting the UHF/VHF converted television signal terminal to the radio frequency amplifier.
    • VHF电视调谐器电路适于通过机械选择来选择来自多个VHF电视频道和UHF / VHF转换电视频道的频道,以形成具有对应于所选频道的电气特性的谐振电路。 调谐器电路耦合到VHF电视信号终端和UHF / VHF转换的电视信号终端。 调谐器电路包括通道选择装置,其包括第一开关和第二开关,每个开关包括固定地定位在通道选择轴上的可动触点和对应于可选择通道位置的固定触点,并且定位在靠近可移动触点处以与之配合。 第一开关包括位于VHF电视信号端子附近的可移动/固定触点组合,并响应于UHF / VHF转换通道位置的选择而被接地以静电屏蔽VHF电视信号终端。 第二开关包括响应于选择用于将UHF / VHF转换的电视信号终端连接到射频放大器的UHF / VHF转换的信道位置的可移动/固定接触组合。