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    • 33. 发明授权
    • Phase servo circuit
    • 相伺服电路
    • US4390908A
    • 1983-06-28
    • US206055
    • 1980-11-12
    • Tadahiko NakamuraKenji NakanoShigeru Tajima
    • Tadahiko NakamuraKenji NakanoShigeru Tajima
    • H04N5/7826G11B15/18G11B15/467G11B27/02G11B27/024H04N5/78
    • G11B27/024G11B15/1808G11B2220/90
    • A phase servo circuit for controlling a rotatable magnetic head which is used for recording and/or reproducing a television signal includes a pulse generator for producing a pulse signal synchronous with the rotating phase of the rotatable magnetic head, a phase difference detecting circuit for generating a control signal which is used for controlling the rotating phase of the rotatable magnetic head, the control signal having a pulse width modulated in response to the phase difference between the pulse signal and the vertical synchronizing signal of a television signal to be recorded, another circuit for detecting the phase difference between the aforementioned vertical synchronizing signal and a second vertical synchronizing signal of a reproduced television signal and a modulating circuit for modulating the pulse width of the control signal in response to the output of the phase difference detecting circuit, whereby the phase angle of the first-mentioned and second vertical synchronizing signals are in synchronization with each other on a magnetic tape in order to carry out tape editing operation.
    • 用于控制用于记录和/或再现电视信号的可旋转磁头的相位伺服电路包括:脉冲发生器,用于产生与可旋转磁头的旋转相位同步的脉冲信号;相位差检测电路,用于产生 用于控制可旋转磁头的旋转相位的控制信号,该控制信号具有响应于要记录的电视信号的脉冲信号和垂直同步信号之间的相位差调制的脉冲宽度, 检测上述垂直同步信号与再现电视信号的第二垂直同步信号之间的相位差,以及响应于相位差检测电路的输出调制控制信号的脉冲宽度的调制电路,由此相位角 的第一和第二垂直同步 为了进行磁带编辑操作,磁带信号在磁带上彼此同步。