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    • 10. 发明授权
    • Variable speed playback controller for a video tape recorder
    • 用于录像机的变速播放控制器
    • US4568986A
    • 1986-02-04
    • US518688
    • 1983-07-29
    • Takashi FuruhataKenji SatohYoshiyuki AzumaYasuhide Mogi
    • Takashi FuruhataKenji SatohYoshiyuki AzumaYasuhide Mogi
    • H04N5/783G11B15/467H04N5/782G11B5/00G11B27/00
    • G11B15/4678
    • A magnetic tape transport controller for a magnetic recording and reproducing apparatus in which a pilot signal for tracking control having four different frequencies is recorded on a magnetic tape by a rotary magnetic head and the magnetic tape is transported in a playback mode at a different tape speed than that in a recording mode. The tape transport controller has means for detecting an amplitude change of a specific one of signals derived by frequency-converting a reproduced pilot signal and controlling the tape speed such that the frequency of the amplitude change is maintained at a predetermined frequency. It also has a phase control loop to control the tape speed such that a phase of the specific signal coincides with a phase of a reference signal. In the playback mode in which the tape is transported at the different speed than that in the recording mode, frequencies of a local pilot signal used to frequency-convert the reproduced pilot signal are switched in the opposite order to that of the switching of the frequencies in the recording mode. A detection circuit which detects a difference between two frequency converted signals of different frequencies and amplifies the difference inverts a polarity of an output signal for each track switching in a standard speed playback mode and does not invert the polarity in a variable speed playback mode.
    • 一种用于磁记录和再现装置的磁带传送控制器,其中用于具有四个不同频率的跟踪控制的导频信号通过旋转磁头记录在磁带上,并且磁带以不同的磁带速度以播放模式传送 比在录音模式。 磁带传送控制器具有用于检测通过对再现的导频信号进行频率转换而导出的特定信号的振幅变化的装置,并且控制磁带速度使得振幅变化的频率保持在预定频率。 它还具有相位控制回路以控制磁带速度,使得特定信号的相位与参考信号的相位一致。 在以与记录模式不同的速度传输磁带的重放模式中,用于频率转换再现的导频信号的本地导频信号的频率以与频率的切换相反的顺序被切换 在录音模式下。 检测不同频率的两个频率转换信号之间的差异并放大差异的检测电路在标准速度重放模式中对每个轨道切换的输出信号的极性反转,并且在变速重放模式中不反转极性。