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    • 4. 发明授权
    • System for controlling rotational direction switchover and for variably
controlling rotational speed of motor
    • 用于控制旋转方向切换和可变控制电机转速的系统
    • US4295080A
    • 1981-10-13
    • US94437
    • 1979-11-15
    • Mitsuo FujitaKoji Matsumura
    • Mitsuo FujitaKoji Matsumura
    • H02P1/22H02P7/00H02P7/06H02P7/288H02P5/06
    • H02P7/2885H02P7/03
    • A system for controlling rotational direction switchover and for variably controlling the rotational speed of a motor comprises a circuit for switching over the rotational direction of the motor, a circuit for supplying rotation driving voltage to the motor thereby to drive it at a speed depending on the rotation driving voltage, a single voltage varying unit for varying voltage continuously, and a control signal generation circuit which receives variable voltage from the voltage varying means to generate a rotational control signal for the rotation driving voltage supplying circuit and further to generate a rotational direction switchover control signal for the switchover circuit. The voltage of the rotation control signal produced by the control signal generation circuit decreasing as the variable voltage approaches a predetermined value, reaching a minimum when the variable voltage coincides with the predetermined voltage, and increasing as the variable voltage goes beyond the predetermined value. The rotational direction switchover control signal is produced by the control signal generation circuit when the variable voltage is substantially the predetermined value.
    • 一种用于控制旋转方向切换和用于可变地控制马达的转速的系统包括用于切换马达的旋转方向的电路,用于向马达提供旋转驱动电压的电路,从而以一定速度驱动马达 旋转驱动电压,用于连续变化电压的单个电压变化单元,以及控制信号生成电路,其接收来自电压变化单元的可变电压,生成用于旋转驱动电压供给电路的旋转控制信号,并进一步产生旋转方向切换 切换电路的控制信号。 控制信号发生电路产生的旋转控制信号的电压随着可变电压接近预定值而减小,当可变电压与预定电压一致时达到最小,并且随着可变电压超过预定值而增加。 当可变电压基本上是预定值时,旋转方向切换控制信号由控制信号产生电路产生。
    • 5. 发明授权
    • Reproduced signal switching circuit for reproducing apparatus having
rotary heads for special reproduction
    • 用于具有用于特殊再现的旋转头的再现装置的再现信号切换电路
    • US4630136A
    • 1986-12-16
    • US652523
    • 1984-09-20
    • Yukio OgawaKoji Matsumura
    • Yukio OgawaKoji Matsumura
    • G11B15/473G11B5/027G11B15/14H04N5/93H04N5/783
    • G11B15/14
    • A reproduced signal switching circuit for a reproducing apparatus, comprises a switching circuit for switching output signals of rotary heads for special reproduction so as to obtain a continuous reproduced signal, a switching signal producing circuit for producing a switching signal responsive to an output pickup pulse of a rotation detecting circuit which detects the rotation of a rotary body which is mounted with the rotary heads, and for applying the switching signal to the switching circuit so as to switch the switching circuit, and a voltage supplying circuit for supplying a voltage which is in accordance with a tape moving speed to the switching signal producing circuit during the special reproduction. The switching signal producing circuit comprises time constant circuits for starting charging operations responsive to the pickup pulse, and a circuit for producing a switching signal having a polarity which changes when charged voltages in the time constant circuits reach a predetermined voltage. The voltage supplying circuit supplies the voltage to be charged to the time constant circuits.
    • 一种用于再现装置的再现信号切换电路,包括用于切换用于特殊再现的旋转磁头的输出信号以便获得连续再现信号的切换电路,用于响应于输出拾取脉冲产生开关信号的开关信号产生电路 旋转检测电路,其检测安装有旋转磁头的旋转体的旋转,并将开关信号施加到开关电路以切换开关电路;以及电压供应电路,用于提供电压为 根据在特殊再现期间到切换信号产生电路的磁带移动速度。 开关信号产生电路包括响应于拾取脉冲启动充电操作的时间常数电路,以及用于产生具有在时间常数电路中的充电电压达到预定电压时变化的极性的开关信号的电路。 电压供给电路将要充电的电压提供给时间常数电路。