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    • 1. 发明授权
    • Control circuit for DC capstan motor
    • 直流主动马达控制电路
    • US4482850A
    • 1984-11-13
    • US422566
    • 1982-09-24
    • Masakazu SonodaTakashi TerajimaMinoru Ozawa
    • Masakazu SonodaTakashi TerajimaMinoru Ozawa
    • G11B15/18G11B15/20G11B15/467G11B15/48G11B15/54H02P3/08H02P7/06H02P23/00H02P3/10
    • G11B15/1808G11B15/1875G11B15/20H02P23/16H02P23/186H02P3/08H02P7/06G11B15/4673G11B15/48G11B15/54
    • A control circuit is used during slow or stop-motion playback operation of a video tape device to drive video tape intermittently. In order to avoid errors in the stopping position of the tape, a pulse width modulated (PWM) signal is provided to a motor controller circuit associated with the capstan motor of the video tape device. A frequency signal generator coupled to this motor generates a frequency signal that varies with the capstan motor speed, and this frequency signal is provided to a retrigger monostable multivibrator which generates a PWM signal whose duty ratio changes in proportion to the capstan motor speed. A drive pulse generator and a brake pulse generator provide drive start and brake start signals, respectively, when it is desired to commence and stop movement of the tape. A drive circuit, including the retrigger monostable multivibrator, receives the drive start signal, the brake start signal, and the frequency signal to generate the PWM signal which is supplied to the motor controller circuit. The frequency signal is selected to have a pulse rate several tens of times the ripple frequency of the motor's torque ripple characteristic so that inaccuracies in stopping position of the motor are eliminated.
    • 在录像带设备的慢速或停止运动播放操作期间使用控制电路来间歇地驱动视频磁带。 为了避免磁带停止位置的错误,将脉冲宽度调制(PWM)信号提供给与录像带装置的主导轴电机相关联的电机控制器电路。 耦合到该电动机的频率信号发生器产生随主导轴电动机速度而变化的频率信号,并且该频率信号被提供给再触发单稳态多谐振荡器,其产生占空比与主导轴电动机速度成比例地变化的PWM信号。 当需要开始和停止磁带的移动时,驱动脉冲发生器和制动脉冲发生器分别提供驱动启动和制动启动信号。 包括再触发单稳态多谐振荡器的驱动电路接收驱动开始信号,制动开始信号和频率信号,以产生提供给马达控制器电路的PWM信号。 选择频率信号具有电机转矩脉动特性的脉动频率几十倍的脉冲频率,从而消除电机停止位置的不准确。
    • 6. 发明授权
    • Video tape recorder with record review mode for editing signals recorded
on magnetic tape
    • 具有记录查看模式的录像机,用于编辑记录在磁带上的信号
    • US4520406A
    • 1985-05-28
    • US361149
    • 1982-03-24
    • Toshinori SuzukiMinoru Ozawa
    • Toshinori SuzukiMinoru Ozawa
    • H04N5/7826G11B15/18G11B15/20G11B27/024G11B27/028H04N5/782
    • G11B15/1808G11B27/024G11B27/028G11B2220/90
    • A video tape recorder (VTR) adapted for use in editing tapes so that a second signal may be recorded on the tape to accurately and closely follow a first signal recorded thereon is provided with a record review mode where a portion of the first recorded signal immediately preceding the changeover, or edit, point may be reviewed prior to recording the second signal. The VTR is of the type which, upon being placed in a pause mode, automatically rewinds the tape by a length corresponding to a first predetermined number of control signals. In the VTR according to the present invention, upon entering the review mode, the tape is automatically rewound for a second length and then played back for a third length corresponding to but slightly less than the sum of the first and second lengths. Thereafter, the VTR automatically reenters the pause mode to be rewound again by the first predetermined length.
    • 适用于编辑磁带的磁带录像机(VTR)被提供有记录检查模式,其中第一记录信号的一部分立即被记录在磁带上,以便将第二信号记录在磁带上以准确和紧密地遵循其上记录的第一信号 在切换之前,或者编辑,可以在记录第二信号之前检查点。 VTR是在被放置在暂停模式中时自动地将磁带倒带与第一预定数量的控制信号相对应的长度的类型。 在根据本发明的VTR中,当进入复查模式时,磁带自动地重绕第二长度,然后再对应于但稍小于第一和第二长度之和的第三长度重放。 此后,VTR自动地重新进入暂停模式以再次重绕第一预定长度。