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    Recording head driver which avoids saturation
    2.
    发明授权
    Recording head driver which avoids saturation 失效
    记录头部驱动器，避免饱和

    公开(公告)号：US3637951A

    公开(公告)日：1972-01-25

    申请号：US3637951D

    申请日：1970-02-17

    Applicant: TELEDYNE GEOTECH

    Inventor： BROWN ROBERT F JR

    IPC: G11B5/03 ,  G11B5/06

    CPC classification number: G11B5/03

    Abstract: An oscillatory circuit for driving a magnetic recording head to record analog intelligence signals in either one of two selectable modes, i.e., frequency modulation of a carrier supplied by the oscillator, or amplitude modulation resembling signals recorded by ordinary AC-biased techniques, the latter also being claimed as a method. The system employs the same oscillatory circuit in both cases, this circuit operating in one mode as a voltage-controlled oscillator wherein both half-cycles of the oscillations are either lengthened or shortened depending upon the polarity of said analog input signal, and operating in the other mode in such a way that the analog input, depending upon its polarity, either shortens or lengthens one half-cycle of oscillation with respect to the other, whereby the zero axis of the oscillations is shifted up or down with changes in amplitude and polarity of the analog input signal to produce in the magnetic recording head a single oscillation signal resembling the composite of an analog signal plus AC-bias which is normally introduced into a recording head by prior art recording techniques. The mode of recording is conveniently determined by simple switch means.

    Abstract translation: 一种振荡电路，用于驱动磁记录头以记录模拟智能信号以两种可选模式中的任一种，即由振荡器提供的载波的频率调制，或类似于通过普通AC偏置技术记录的信号的幅度调制，后者也 作为一种方法被要求。 该系统在两种情况下采用相同的振荡电路，该电路在一种模式下工作为压控振荡器，其中振荡的两个半周期根据所述模拟输入信号的极性而被延长或缩短，并且在 其他模式，使得模拟输入取决于其极性，相对于另一个缩短或延长振荡的一个半周期，由此振荡的零轴随着振幅和极性的变化而向上或向下偏移 的模拟输入信号，以在磁记录头中产生类似于通过现有技术记录技术通常被引入到记录头中的模拟信号加上AC偏压的复合的单个振荡信号。 记录方式由简单的开关装置方便地确定。

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