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    • 2. 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。
    • 3. 发明授权
    • Television tuner circuit for selection of VHF and UHF/VHF converted
television signals
    • 用于选择VHF和UHF / VHF转换的电视信号的电视调谐器电路
    • US4112378A
    • 1978-09-05
    • US780112
    • 1977-03-22
    • Katsuo ItoBunjiro MurataYoji MaedaEiichi Hibino
    • Katsuo ItoBunjiro MurataYoji MaedaEiichi Hibino
    • H04B1/18H03J5/24H03J5/28H04B1/26H04B1/06
    • H03J5/24
    • A VHF television tuner circuit for selection of a television signal through mechanical selection of inductance coils comprises a first terminal for receiving a VHF television signal comprising a high and low VHF channel signals; a second terminal for receiving a UHF/VHF converted television signal; a mechanical channel selection switch arrangement for selection of a plurality of channel positions by rotation of a channel selection shaft said mechanical channel selection switch arrangement comprising a radio frequency coil switching stage and an oscillation coil switching stage; a radio frequency coil means coupled to the radio frequency coil switching stage; an oscillation coil coupled to the oscillation coil switching stage; a radio frequency amplifier coupled to the radio frequency coil switching stage for selectively amplifying a desired radio frequency signal; a local oscillator coupled to the oscillation coil switching stage for providing a local oscillation frequency, the frequency of which is different by a given frequency difference from the selectively amplified radio frequency signal; and a mixer responsive to the radio frequency amplifier and the local oscillator for providing an intermediate frequency signal. The radio frequency coil switching stage comprises a first stage radio frequency coil switch for selectively grounding or disconnecting the transmission path from said first terminal and for selecting a radio frequency coil corresponding to each VHF channel, and a second stage radio frequency coil switch selectably connectable to the radio frequency coil selected by the first stage radio frequency coil switch for selectively connecting said second terminal to said radio frequency amplifier, and for selectively connecting various capacitors in various ways to form a resonance circuit for selecting a desired radio frequency.
    • 用于通过电感线圈的机械选择来选择电视信号的VHF电视调谐器电路包括:用于接收包括高和低VHF信道信号的VHF电视信号的第一终端; 用于接收UHF / VHF转换的电视信号的第二终端; 机械通道选择开关装置,用于通过通道选择轴的所述机械通道选择开关装置的旋转来选择多个通道位置,所述机械通道选择开关装置包括射频线圈切换级和振荡线圈切换级; 耦合到射频线圈切换级的射频线圈装置; 耦合到振荡线圈切换级的振荡线圈; 耦合到所述射频线圈切换级的射频放大器,用于选择性地放大期望的射频信号; 耦合到振荡线圈切换级的本地振荡器,用于提供本地振荡频率,其频率与来自选择性放大的射频信号的给定频率差异; 以及响应于射频放大器和本地振荡器的用于提供中频信号的混频器。 射频线圈切换级包括:第一级射频线圈开关,用于选择性地接地或断开与所述第一端子的传输路径,并选择与VHF通道相对应的射频线圈;以及第二级射频线圈开关,其可选择地连接到 由第一级射频线圈开关选择的射频线圈,用于选择性地将所述第二端子连接到所述射频放大器,并且以各种方式选择性地连接各种电容器,以形成用于选择所需射频的谐振电路。
    • 4. 发明授权
    • VHF Television tuner with easy/flexible access
    • US4157504A
    • 1979-06-05
    • US780109
    • 1977-03-22
    • Katsuo ItoBunjiro MurataYoji MaedaKazunori YoshimuraEiichi Hibino
    • Katsuo ItoBunjiro MurataYoji MaedaKazunori YoshimuraEiichi Hibino
    • H03J1/00H04B1/06
    • H03J1/00
    • A VHF television tuner for selection of a broadcasting television signal through mechanical switching selection of inductance coils, comprising; a tuner casing; a mechanical channel selection switch arrangement provided in said casing and including a rotatably mounted channel selection shaft for selection of inductance coils by rotation of said shaft; a radio frequency amplifier operatively coupled to the selected inductance coils for selectively amplifying a desired radio frequency signal; a local oscillator operatively coupled to said selected inductance coils for providing a local oscillation frequency signal, the frequency of which is different by a given frequency difference from said selectively amplified radio frequency signal; a mixer responsive to the radio frequency signal from said radio frequency amplifier and the local oscillation frequency signal from said local oscillator for providing an intermediate frequency signal; and an intermediate frequency tuned circuit for selectively withdrawing said intermediate frequency signal, said intermediate frequency tuned circuit comprising an intermediate frequency transformer, said intermediate frequency transformer comprising an intermediate frequency coil wound around a bobbin having a given axis and a magnetic core threadably inserted in said bobbin for adjustment of the inductance value of said intermediate frequency coil by rotation of said magnetic core about said axis of said bobbin, said intermediate frequency transformer being provided in said casing such that the axis of said bobbin is oriented in the direction substantially parallel to the axial direction of said channel selection shaft, said casing being formed of an aperture at the position in alignment with the axis of said bobbin, whereby access to said intermediate frequency transformer is allowed from the outside of said casing for adjustment of the inductance value of said intermediate frequency transformer.
    • 9. 发明授权
    • CATV tuner and one-chip IC used therein
    • CATV调谐器和其中使用的单芯片IC
    • US07480495B2
    • 2009-01-20
    • US10379722
    • 2003-03-06
    • Akimasa MatsushimaYoji MaedaHiroyuki Tetsuno
    • Akimasa MatsushimaYoji MaedaHiroyuki Tetsuno
    • G06F3/033
    • H04N7/102H05K9/006
    • A CATV tuner includes a metallic housing having first through fourth partitioned chambers. In the first through fourth partitioned chambers, a data circuit, an input filter circuit, a first mixer circuit, a first local oscillation circuit, a first intermediate frequency circuit, and other elements are housed. In the fifth partitioned chamber, a second intermediate circuit and an IC including a second local oscillation circuit are housed. With this configuration, the CATV tuner defines an up/down tuner. The third partitioned chamber in which the first local oscillation circuit is housed and the fifth partitioned chamber in which the second local oscillation circuit is housed are located adjacent to each other. Lines and terminals are used both for a first PLL circuit and a second PLL circuit.
    • CATV调谐器包括具有第一至第四分隔室的金属外壳。 在第一至第四分隔室中,容纳有数据电路,输入滤波电路,第一混频电路,第一本机振荡电路,第一中频电路等。 在第五分隔室中容纳有第二中间电路和包括第二本地振荡电路的IC。 通过这种配置,CATV调谐器定义了一个上/下调谐器。 容纳第一本地振荡电路的第三分隔室和容纳第二本地振荡电路的第五分隔室彼此相邻。 线路和端子用于第一PLL电路和第二PLL电路。