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    • 1. 发明授权
    • Apparatus for reproducing information at variable speeds from a magnetic
tape
    • 用于以磁带从可变速度再现信息的装置
    • US4791507A
    • 1988-12-13
    • US817860
    • 1985-12-30
    • Yoshiaki DoyamaKanji KuboKoichi Yamada
    • Yoshiaki DoyamaKanji KuboKoichi Yamada
    • G11B5/592G11B15/18G11B5/584H04N5/783
    • G11B15/1875G11B5/592
    • A magnetic recording-playback apparatus having a rotary magnetic head mounted on a piezo-electric element so that the head can trace a recording track. The scanning track, voltage waveform applied to a piezo-electric element and tape speed for the next head scanning operation are calculated based on the current application voltage center value and current tape speed, and this arithmetic operation is repeated for each head scan, thereby enabling continuous noise-free picture reproduction at arbitrary tape speeds. Moreover, when the tape speed is changed, the speed command is varied in steps up to the target speed, thereby enabling noise-free picture reproduction also in the transition of tape speeds.
    • PCT No.PCT / JP85 / 00259 Sec。 371日期1985年12月30日第 102(e)1985年12月30日日期PCT提交1985年5月9日PCT公布。 第WO85 / 05522号公报 1985年12月5日。一种磁记录重放装置,其具有安装在压电元件上的旋转磁头,使得头可以跟踪记录轨道。 根据当前施加电压中心值和当前磁带速度计算施加到压电元件的扫描轨迹,电压波形和用于下一个头扫描操作的磁带速度,并且对于每个头扫描重复该算术运算,从而使能 连续无噪音的图像以任意的磁带速度再现。 此外,当磁带速度改变时,速度指令一直升高到目标速度,从而在磁带速度的转变中也能够实现无噪点的图像再现。
    • 2. 发明授权
    • Helical scan magnetic recording and reproduction system with head
position control
    • 螺旋扫描磁记录和再现系统,带头位置控制
    • US4644414A
    • 1987-02-17
    • US491771
    • 1983-05-05
    • Koichi YamadaKanji KuboYasuo Nishitani
    • Koichi YamadaKanji KuboYasuo Nishitani
    • H04N5/92G11B5/588G11B15/18G11B15/467H04N5/783H04N5/93
    • H04N5/93G11B15/1808G11B5/588
    • A magnetic recording and reproduction system of the helical scan type is disclosed. During the recording process, pilot signals for reproduction tracking control are sequentially recorded by the rotary magnetic head in recording tracks in proximity to each other in superimposed relation with the television signal to be recorded. During the normal reproduction process, from the level difference between the crosstalk signals of the pilot signals reproduced from the recording tracks adjacent to the recording track to be reproduced, a tracking error is detected to control the relative positions of the recording track and the reproduction scanning traces of the reproduction magnetic head. During the reproduction process at a speed different from that for recording, on the other hand, a pulse signal is produced at a time point when the crosstalk levels of the pilot signals reproduced from the tracks adjacent to the recording track to be reproduced coincide with each other. This pulse signal is used to maintain a predetermined positional relation between the recording track and the reproduction scanning traces of the reproduction magnetic head thereby to produce a superior reproduced image.
    • 公开了螺旋扫描型的磁记录和再现系统。 在记录过程中,用于再现跟踪控制的导频信号通过旋转磁头在彼此接近的记录轨道中被顺序地记录,与要记录的电视信号叠加。 在正常再现处理期间,根据与要再现的记录轨道相邻的记录道再现的导频信号的串扰信号之间的电平差,检测到跟踪误差,以控制记录轨迹和再现扫描的相对位置 痕迹的再现磁头。 另一方面,在再现处理期间,在从与要再现的记录轨道相邻的轨道再现的导频信号的串扰电平与每一个重合一致的时刻,产生脉冲信号 其他。 该脉冲信号用于保持记录轨道和再现磁头的再现扫描轨迹之间的预定位置关系,从而产生优良的再现图像。