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热词
    • 5. 发明授权
    • Digital signal recording and/or reproducing apparatus having a
phase-locked loop for generating a clock signal from recording signals
during a recording operation and reproducing signal during a
reproducing operation and a method thereof
    • 具有用于在再现操作期间在记录操作和再现信号期间从记录信号产生时钟信号的锁相环的数字信号记录和/或再现装置及其方法
    • US5809207A
    • 1998-09-15
    • US601944
    • 1996-02-15
    • Shiro MiyagiYasutaka Kotani
    • Shiro MiyagiYasutaka Kotani
    • G11B20/14G11B27/032G11B27/036H04N5/76H04N5/92
    • G11B27/032G11B20/1403G11B27/036G11B2220/90
    • An apparatus and method for recording and/or reproducing a digital signal. An input digital signal is received and processed by a recording processing device so as to form a recording signal. The recording signal may be recorded onto and reproduced from a recording medium. The reproduced signal may be processed by a reproducing processing device so as to form an output signal. Processing performed by the reproducing processing device may be controlled by a clock signal provided by a phase-locked loop (PLL) circuit. The PLL circuit respectively receives the recording and reproduced signals when the apparatus is operating in a recording mode and a reproducing mode, and generates the clock signal therefrom. Alternatively, instead of the recording signal, the PLL circuit may receive a leakage current when the apparatus is operating in the recording mode. In this latter situation, the PLL circuit generates the clock signal from the leakage current and the reproduced signal. As a result, signals may be satisfactorily reproduced and processed even after operations (such as after-recording operations) wherein reproduced signals are unavailable for supply to the PLL circuit are completed.
    • 一种用于记录和/或再现数字信号的装置和方法。 输入数字信号由记录处理装置接收和处理,以形成记录信号。 记录信号可以被记录在记录介质上并从记录介质再现。 再现信号可以由再现处理装置处理,以形成输出信号。 由再现处理装置执行的处理可以由锁相环(PLL)电路提供的时钟信号来控制。 当该装置在记录模式和再现模式下操作时,PLL电路分别接收记录和重放信号,并从其产生时钟信号。 或者,代替记录信号,当设备在记录模式下操作时,PLL电路可以接收泄漏电流。 在后一种情况下,PLL电路从漏电流和再生信号产生时钟信号。 结果,即使在再现信号不能供给PLL电路的操作(例如后记录操作)完成之后,也可以令人满意地再现和处理信号。
    • 6. 发明授权
    • Digital video cassette recorder
    • 数字录像机
    • US06600871B1
    • 2003-07-29
    • US09307055
    • 1999-05-07
    • Kazuyuki IesakaYasutaka Kotani
    • Kazuyuki IesakaYasutaka Kotani
    • H04N591
    • G11B15/1808G11B15/125
    • A digital video cassette recorder comprising a plurality of heads provided on a rotary member and performing the recording/playback of the data on slanted tracks in performing helical scanning for a magnetic recording medium with the above mentioned heads, wherein the heads being composed of a first and a second heads being disposed opposing to each other at an angle of 180° and a third head being disposed in a position at an angle of 270° in the direction of rotation from the first head, having the same azimuth angle as that of the second head, the digital video cassette recorder also comprising a changeover switch for switching the first, the second and the third heads, and two modes having different data compression rates from each other, and in the first mode, recording/playback being performed in switching the first and the second heads alternately, and in the second mode, the tape feeding speed is made half and recording/playback being performed once in two rotations in switching the first and the third heads alternately. The fixing heights of heads on the rotary member are made to differ in every head, in order to dissolve the difference in head outputs caused by the difference in azimuth angles related with the direction of orientation of the magnetic recording medium and the recording direction of the slanted tracks and to dissolve the difference in head outputs caused by the imbalance of the side erase at the time of recording.
    • 一种数字录像机,包括设置在旋转构件上的多个磁头,并且在执行用上述磁头进行磁记录介质的螺旋扫描时,对倾斜轨迹上的数据进行记录/重放,其中磁头由第一 并且第二头部以180°的角度彼此相对设置,并且第三头部沿着与第一头部的旋转方向以270°的角度设置,具有与第一头部相同的方位角 第二头,数字录像机还包括用于切换第一,第二和第三磁头的转换开关和具有不同数据压缩率的两种模式,并且在第一模式中,在切换中执行记录/重放 第一和第二头交替地,并且在第二模式中,将带进给速度设为一半,并且在开关中以两次旋转执行一次记录/重放 交替地移动第一和第三头。 旋转构件上的头部的固定高度在每个头部上不同,以便解决由与磁记录介质的取向方向和方向相关的方位角差异引起的头部输出的差异 倾斜的轨迹并且解决由记录时的侧面擦除的不平衡引起的头部输出的差异。