Helical scan recorder having capstan motor speed responsive to a
frequency of a command signal
    1.
    发明授权
    Helical scan recorder having capstan motor speed responsive to a frequency of a command signal 失效
    螺旋扫描记录器具有响应命令信号频率的主导轴电机速度

    公开(公告)号:US4286199A

    公开(公告)日:1981-08-25

    申请号:US116586

    申请日:1980-01-29

    摘要: In a helical scan video tape recorder, a capstan motor is speed-controlled in response to a command frequency of a command signal under a special reproducing mode called a SEARCH MODE. A speed servo loop for the capstan motor for this purpose includes a pair of pulse converters and a pair of integrating circuits for comparing the command signal and a rotation signal generated by a frequency generator attached to the capstan motor. A time constant of the integrating circuit for the command signal path is selected to be smaller than that of the integrating circuit for the rotation signal, so that the capstan motor is driven in a pulse drive mode below a predetermined speed.

    摘要翻译: 在螺旋扫描磁带录像机中,主导电动机在被称为搜索模式的特殊再现模式下响应命令信号的指令频率进行速度控制。 用于该牵引电动机的速度伺服回路包括一对脉冲转换器和一对积分电路,用于比较命令信号和由连接到主导轴马达的频率发生器产生的旋转信号。 选择用于指令信号路径的积分电路的时间常数小于用于旋转信号的积分电路的时间常数,使得主导轴电动机以低于预定速度的脉冲驱动模式被驱动。