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    • 10. 发明授权
    • Rotary switch type television tuner
    • 旋转开关式电视调谐器
    • US4305156A
    • 1981-12-08
    • US104443
    • 1979-12-17
    • Katsuo ItoBunjiro MurataYoji Maeda
    • Katsuo ItoBunjiro MurataYoji Maeda
    • H04B1/08H03J1/00H03J5/28H04B1/26H04N5/64H03J5/02
    • H03J5/28
    • A television tuner comprises a rotary switching shaft, switching plates associated with the rotary switching shaft, and an input tuning portion, an interstage tuning portion and a frequency converting portion coupled to the switching plates and adapted for channel selection by means of the rotary switching shaft. An additional plate is provided between one switching plate associated with the interstage tuning portion and another switching plate associated with the frequency converting portion. The additional plate is provided with a surface acoustic wave device performing the function of a video intermediate frequency filter and with an integrated circuit including a video intermediate frequency amplifier and a video detector.
    • 电视调谐器包括旋转切换轴,与旋转切换轴相关联的切换板,以及输入调谐部分,级间调谐部分和耦合到切换板的频率转换部分,并且适于通过旋转切换轴 。 在与级间调谐部分相关联的一个切换板和与频率转换部分相关联的另一切换板之间设置一个附加的板。 附加板设置有执行视频中频滤波器的功能的声表面波器件和具有视频中频放大器和视频检测器的集成电路。