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65 条记录 (耗时 0.012 秒)

    Characteristic switching circuit
    1.
    发明公开
    Characteristic switching circuit 失效
    Netzwerkes的Schaltung zur Wahl des Frequenzganges。

    公开(公告)号：EP0091672A2

    公开(公告)日：1983-10-19

    申请号：EP83103438.4

    申请日：1983-04-08

    申请人： Hitachi, Ltd. ,  HITACHI MICROCOMPUTER ENGINEERING LTD.

    发明人： Fukushima, Isao ,  Kuwahara, Kazuyoshi ,  Itoigawa, Keiichi ,  Kobori, Yasunori ,  Nishijima, Hideo

    IPC分类号： H03H11/04 ,  H03H19/00

    CPC分类号： H03H19/004

    摘要： A time constant circuit capable of switching the characteristic, which is realized by a combination of an equivalent resistor made up of a switched capacitor and an ordinary capacitor, comprises a capacitor (20, 26, 27) of the switched capacitor or the time constant circuit connected in parallel to a series circuit including a switching device (29, 51, 69) and an additional capacitor (28, 47, 52, 56, 58). The characteristic is switched by turning on and off the additional capacitor by the switching device. The direct connection of a plurality of equivalent resistors with a plurality of switched capacitors and ordinary capacitors makes up an equalizer. The capacitor making up a switched capacitor is connected with a switching device and an additional capacitor so that the frequency characteristic of the equalizer is switchable by turning on and off the switching device. Each of the capacitors making up the switched capacitors, the capacitors making up the time constant circuits and the additional capacitors has an end thereof grounded without fail. All the elements are thus capable of being formed in the same integrated circuits.

    摘要翻译： 能够切换通过由开关电容器和普通电容器构成的等效电阻的组合实现的特性的时间常数电路包括开关电容器的电容器或与串联电路并联连接的时间常数电路 包括开关器件和附加电容器。 通过开关装置接通和关闭附加电容器来切换特性。 多个等效电阻器与多个开关电容器和普通电容器的直接连接构成均衡器。 构成开关电容器的电容器与开关器件和附加电容器连接，使得均衡器的频率特性可通过接通和断开开关器件来切换。 构成开关电容器的每个电容器，构成时间常数电路的电容器和附加电容器的端部接地。 因此，所有元件能够形成在相同的集成电路中。

    Characteristic switching circuit
    4.
    发明公开
    Characteristic switching circuit 失效
    特性切换电路

    公开(公告)号：EP0091672A3

    公开(公告)日：1985-06-12

    申请号：EP83103438

    申请日：1983-04-08

    申请人： Hitachi, Ltd. ,  HITACHI MICROCOMPUTER ENGINEERING LTD.

    发明人： Fukushima, Isao ,  Kuwahara, Kazuyoshi ,  Itoigawa, Keiichi ,  Kobori, Yasunori ,  Nishijima, Hideo

    IPC分类号： H03H11/04 ,  H03H19/00

    CPC分类号： H03H19/004

    摘要： A time constant circuit capable of switching the characteristic, which is realized by a combination of an equivalent resistor made up of a switched capacitor and an ordinary capacitor, comprises a capacitor (20, 26, 27) of the switched capacitor or the time constant circuit connected in parallel to a series circuit including a switching device (29, 51, 69) and an additional capacitor (28, 47, 52, 56, 58). The characteristic is switched by turning on and off the additional capacitor by the switching device. The direct connection of a plurality of equivalent resistors with a plurality of switched capacitors and ordinary capacitors makes up an equalizer. The capacitor making up a switched capacitor is connected with a switching device and an additional capacitor so that the frequency characteristic of the equalizer is switchable by turning on and off the switching device. Each of the capacitors making up the switched capacitors, the capacitors making up the time constant circuits and the additional capacitors has an end thereof grounded without fail. All the elements are thus capable of being formed in the same integrated circuits.

    摘要翻译： 能够切换通过由开关电容器和普通电容器构成的等效电阻的组合实现的特性的时间常数电路包括开关电容器的电容器或与串联电路并联连接的时间常数电路 包括开关器件和附加电容器。 通过开关装置接通和关闭附加电容器来切换特性。 多个等效电阻器与多个开关电容器和普通电容器的直接连接构成均衡器。 构成开关电容器的电容器与开关器件和附加电容器连接，使得均衡器的频率特性可通过接通和断开开关器件来切换。 构成开关电容器的每个电容器，构成时间常数电路的电容器和附加电容器的端部接地。 因此，所有元件能够形成在相同的集成电路中。

    Servo system for magnetic recording/reproduction apparatus
    6.
    发明公开
    Servo system for magnetic recording/reproduction apparatus 失效
    Aufzeichnungs / Wiedergabe-Gerät的Steuerungsanlagefürmagnetisches。

    公开(公告)号：EP0130573A2

    公开(公告)日：1985-01-09

    申请号：EP84107473.5

    申请日：1984-06-28

    申请人： HITACHI, LTD. ,  HITACHI MICROCOMPUTER ENGINEERING LTD.

    发明人： Okamoto, Kaneyuki ,  Kobori, Yasunori ,  Nishijima, Hideo ,  Takahashi, Takashi ,  Fukushima, Isao ,  Kano, Kenji ,  Ichimura, Shinya

    IPC分类号： G11B15/467

    CPC分类号： G11B15/1875 ,  G11B15/4673

    摘要： In a helical scan-type video tape recorder, a tach signal is generated as a reference signal when the rotating heads (2, 3) trace the vertical blanking period recorded portion of the tracks on a magnetic tape (1) moving at the standard speed, and this reference signal and a signal indicative of the level-reduced portion (N) of the reproduced video signal (V) from the rotating heads are compared in phase with each other to produce a phase difference signal (T), by which the transportation of the magnetic tape is controlled so that the level-reduced portion coincides with the vertical blanking period of the reproduced video signal.

    摘要翻译： 在螺旋扫描型磁带录像机中，当旋转磁头（2,3）跟踪以标准速度移动的磁带（1）上的轨道的垂直消隐周期记录部分时，产生一个信号作为参考信号 ，并且将该参考信号和表示来自旋转磁头的再现视频信号（V）的电平减小部分（N）的信号彼此相位进行比较，以产生相位差信号（T），由此， 控制磁带的传输，使得电平减小部分与再现的视频信号的垂直消隐周期一致。

    Auto-tracking method and apparatus of a magnetic recording/reproducing apparatus
    10.
    发明公开
    Auto-tracking method and apparatus of a magnetic recording/reproducing apparatus 失效
    自动跟踪方法和磁记录/再现装置的设备

    公开(公告)号：EP0169479A3

    公开(公告)日：1987-08-19

    申请号：EP85108881

    申请日：1985-07-16

    申请人： HITACHI, LTD. ,  HITACHI MICROCOMPUTER ENGINEERING LTD.

    发明人： Kobori, Yasunori ,  Nishijima, Hideo ,  Okamoto, Kaneyuki ,  Fukushima, Isao ,  Goto, Katsuhiko ,  Takahashi, Takashi

    IPC分类号： G11B15/467

    CPC分类号： G11B15/4676

    摘要： An auto-tracking method and apparatus of a magnetic recording/reproducing appartus are disclosed. The apparatus comprises: a reference signal generator (9) for generating a reference signal (REF); a rotary cylinder driver (3, 5) for rotating, synchronously with the reference signal, a rotary cylinder to which magnetic heads are attched; a head switching signal generator (16, 17) for detecting a rotational phase of the rotary cyliner and outputting a head switching signal (HS) representative of this detected rotational phase; a reproduction signal envelope level detection circuit (13, 14) for sampling and detecting the envelope levels of the reproduced signals derived by the magnetic heads at timings corresponding to the head switching signal; a tape running apparatus (2, 6) for driving a magnetic tape at a phase difference designated with respect to the rotational phase of the magnetic heads; a reference signal delay circuit (10, 11) for generating a delay reference signal (DREF) to control the tape running apparatus on the basis of the reference signal, in which the delay reference signal is derived by delaying the reference signal by an arbitrary time; and means for conrolling the reference signal delay circuit (12) on the basis of the head switching signal and the detected envelope levels of the reproduced signals in a manner that the reference signal delay circuit first changes the run of the magnetic tape at a rough step within a tracking phase range of 2 1 r and thereby detecting the roughly searched maximum envelope level of the reproduced signals, and then changes the run of the magnetic tape at a fine step within a tracking phase range which is narrower than 2π and which includes the running phase of the magnetic tape corresponding to the roughly searched maximum envelope level and thereby detecting the finely searched maximum envelope level, and thereby allowing the magnetic tape to run at the phase corresponding to the finely searched maximum envelope level. With this apparatus, the best tracking state can be accurately and certainly obtained in a short time.