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    • 6. 发明授权
    • Magnetic operations monitor
    • 磁性操作监控
    • US3875387A
    • 1975-04-01
    • US45323374
    • 1974-03-21
    • BOSTIC MICHAEL E
    • BOSTIC MICHAEL E
    • G07C3/12B41L39/02
    • G07C3/12
    • A magnetics operation monitor employing a sensor adapted to sense the presence of a changing electromagnetic field for producing an electrical signal. The electrical signal is coupled to an adapter unit which provides a triggering pulse to a driver, which in turn provides a fixed duration pulse. The fixed duration pulse is coupled to a gating unit which in turn couples a recording signal source for the duration of the gating signal to a transcription device such as a tape recorder or the like.
    • 一种使用传感器的磁性操作监视器,该传感器适于感测用于产生电信号的变化的电磁场的存在。 电信号耦合到适配器单元,该适配器单元向驱动器提供触发脉冲,驱动器又提供固定的持续时间脉冲。 固定持续时间脉冲耦合到选通单元,该选通单元又将门控信号的持续时间内的记录信号源耦合到诸如磁带记录器等的转录设备。