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    • 4. 发明授权
    • Method for decoding double-encoding codes and apparatus using the same
    • 用于对双重编码码进行解码的方法及使用其的装置
    • US4653052A
    • 1987-03-24
    • US750513
    • 1985-07-01
    • Nobukazu DoiMorishi IzumitaSeiichi MitaYoshizumi EtoMorito Rokuda
    • Nobukazu DoiMorishi IzumitaSeiichi MitaYoshizumi EtoMorito Rokuda
    • G06F11/10H03M13/27H03M13/29
    • H03M13/29
    • The present invention relates to a method and an apparatus for decoding double-encoding codes in which the information to be decoded comprises a first data and a second data. The operation for decoding double-encoding codes is achieved through two stages. A decoder of the first stage checks the first data, and when an error is found in the first data, all symbols of the first data are assumed to be wrong. The first-stage decoder then adds an erasure flag to all symbols to generate erasure symbols. As a result, these erasure symbols include the symbols which are actually erroneous and those which are correct. A decoder of the second stage is used to perform an error correction on the second data. For this purpose, the second-stage decoder detects the number of erasure symbols which are contained in the second data and which are actually erroneous. If the number of actually erroneous symbols does not exceed the maximum number of correctable symbols which can be corrected by the decoder of the second stage, the error correction is effected; otherwise, the decoder detects an error without conducting the error correction.
    • 本发明涉及一种用于解码双重编码码的方法和装置,其中待解码的信息包括第一数据和第二数据。 双编码解码操作通过两个阶段实现。 第一级的解码器检查第一数据,并且当在第一数据中发现错误时,假定第一数据的所有符号是错误的。 然后,第一级解码器将擦除标志添加到所有符号以产生擦除符号。 结果,这些擦除符号包括实际上是错误的符号和正确的符号。 第二级的解码器用于对第二数据执行纠错。 为此,第二级解码器检测包含在第二数据中并且实际上是错误的擦除符号的数量。 如果实际错误符号的数量不超过可由第二级的解码器校正的可校正符号的最大数目,则进行纠错; 否则,解码器在不进行纠错的情况下检测到错误。
    • 5. 发明授权
    • Optical tape apparatus with a tracking control mechanism and/or a
focusing control mechanism
    • 具有跟踪控制机构和/或聚焦控制机构的光带装置
    • US4970707A
    • 1990-11-13
    • US239389
    • 1988-09-01
    • Fumio HaraYoshito TsunodaShigeru NakamuraYoshizumi EtoSeiichi MitaMorishi IzumitaHiroyuki TsuchinagaMasuo Kasai
    • Fumio HaraYoshito TsunodaShigeru NakamuraYoshizumi EtoSeiichi MitaMorishi IzumitaHiroyuki TsuchinagaMasuo Kasai
    • G11B7/003G11B7/09
    • G11B7/09G11B7/0031G11B7/0925
    • An optical tape apparatus having improved focus and tracking control. An optical head records, reproduces, or rewrites data on an optical tape by helically scanning the tape with a laser beam. A guide plate is disposed between the optical head and the tape to prevent the beam from becoming unfocused due to fluctuation of the tape cuased by an air film between the optical head and the tape. The optical head contains a semiconductor laser and an optical system exhibiting chromatic aberration for directing the laser beam onto the tape. The optical system includes a condenser lens for focusing the beam onto the tape. Fine focus control is achieved by changing the wavelength of the laser beam by directing part of the beam reflected from the tape back to the laser, thereby changing the focal point of the beam by virtue of the chromatic aberration of the optical system. Coarse focus control is achieved by mounting the condenser lens on a piezoelectric actuator which moves the consenser lens to focus the beam onto the tape. A recording head for recording timing marks and tracking signals on the tape is disposed in advance of the optical head. A reading head reads the timing marks and the optical head reads the tracking signals. The timing marks and tracking signals are used to control the operation of the apparatus such that the tape is transported with a constant speed and data on diagonal signal tracks on the tape is accurately recorded, reproduced, or rewritten.
    • 具有改进的聚焦和跟踪控制的光带装置。 光学头通过用激光束螺旋扫描磁带来记录,再现或重写光学带上的数据。 引导板设置在光头和带之间,以防止由于光头和带之间的空气膜带来的带的波动而导致光束不聚焦。 光头包含半导体激光器和具有用于将激光束引导到带上的色差的光学系统。 光学系统包括用于将光束聚焦到胶带上的聚光透镜。 通过将从带反射的光束的一部分引回到激光器来改变激光束的波长,从而通过光学系统的色差来改变光束的焦点来实现精细对焦控制。 通过将聚光透镜安装在压电致动器上来实现粗调焦控制,该压电致动器移动辅助透镜以将光束聚焦到带上。 在光学头之前设置用于在带上记录定时标记和跟踪信号的记录头。 读头读取定时标记,光头读取跟踪信号。 定时标记和跟踪信号用于控制装置的操作,使得磁带以恒定速度传送,并且磁带上对角线信号轨道上的数据被精确地记录,再现或重写。