公开(公告)号：US5848045A

公开(公告)日：1998-12-08

申请号：US968526

申请日：1997-11-12

申请人： Fumiyoshi Kirino ,  Tsuyoshi Toda ,  Hiroshi Ide ,  Hisataka Sugiyama ,  Atsushi Saito ,  Hiroyuki Tsuchinaga ,  Takeshi Maeda ,  Fumio Kugiya ,  Toshimitsu Kaku ,  Seiichi Mita ,  Kazuo Shigematsu ,  Yasuhide Ouchi

发明人： Fumiyoshi Kirino ,  Tsuyoshi Toda ,  Hiroshi Ide ,  Hisataka Sugiyama ,  Atsushi Saito ,  Hiroyuki Tsuchinaga ,  Takeshi Maeda ,  Fumio Kugiya ,  Toshimitsu Kaku ,  Seiichi Mita ,  Kazuo Shigematsu ,  Yasuhide Ouchi

IPC分类号： G11B7/0045 ,  G11B7/095 ,  G11B7/125 ,  G11B11/105 ,  G11B20/12 ,  G11B20/18 ,  G11B7/00

CPC分类号： G11B7/126 ,  G11B11/1053 ,  G11B11/10595 ,  G11B7/0045 ,  G11B7/0956 ,  G11B20/1258 ,  G11B20/182

摘要： A super high density optical disk apparatus is obtained by using an exchangeable recording medium having a recording capacity of at least 1.5 Gb/in.sup.2 in an optical recording and reading apparatus for recording or reading at least using a laser beam or by using one of means which can record on a recording medium only once and means which can record at least two times repeatedly as recording means to be used.

摘要翻译： 通过在至少使用激光束进行记录或读取的光学记录和读取装置中使用具有至少1.5Gb / in2的记录容量的可交换记录介质来获得超高密度光盘装置，或者通过使用 可以在记录介质上记录一次，并且可以重复记录至少两次作为要使用的记录装置的装置。

公开(公告)号：US06493165B1

公开(公告)日：2002-12-10

申请号：US09406920

申请日：1999-09-28

申请人： Naoki Satoh ,  Seiichi Mita

发明人： Naoki Satoh ,  Seiichi Mita

IPC分类号： G11B5035

CPC分类号： G11B20/10009 ,  G11B5/012 ,  G11B5/035 ,  G11B5/09 ,  G11B20/18 ,  G11B2020/183

摘要： There is provided a magnetic disk drive in which the adaptability of read signal processing of the magnetic disk drive is enhanced so that the frequency of retry or miscorrection in use is reduced. This magnetic disk drive has a read circuit, and a channel condition measuring circuit. An output of an A/D converter contained in the read circuit is supplied to a digital equalizing circuit so as to be equalized accurately. Upon input of a signal for instructing a coefficient learning circuit to learn the coefficient of the digital equalizing circuit, the initial coefficient registered in a register is set as a coefficient value in another register and the coefficient learning circuit is operated to start consecutive learning of coefficient values. In the channel condition measuring circuit, errors in a row of output values of the digital equalizing circuit are calculated and an integrated value of squares of the errors is compared with an error threshold value. If the integrated value is larger than the error threshold value, coefficient learning is regarded as being abnormal and a control signal for discarding the coefficient registered in the register is issued so that the register is reset to the initial coefficient value. The signal for instructing the coefficient learning circuit to learn the coefficient may be outputted in a sector previous to the read target sector or may be outputted in the read target sector.

摘要翻译： 提供了一种磁盘驱动器，其中增强了磁盘驱动器的读取信号处理的适应性，从而减少了使用中的重试或错误修复的频率。 该磁盘驱动器具有读取电路和通道状态测量电路。 包含在读取电路中的A / D转换器的输出被提供给数字均衡电路，以便被精确地均衡。 在输入用于指示系数学习电路以学习数字均衡电路的系数的信号时，登记在寄存器中的初始系数被设置为另一寄存器中的系数值，并且系数学习电路被操作以开始系数的连续学习 价值观。 在通道条件测量电路中，计算数字均衡电路的一行输出值的误差，并将误差的平方的积分值与误差阈值进行比较。 如果积分值大于误差阈值，则将系数学习视为异常，并且发出用于丢弃寄存在寄存器中的系数的控制信号，使得寄存器被重置为初始系数值。 用于指示系数学习电路学习系数的信号可以在读取目标扇区之前的扇区中输出，或者可以在读取的目标扇区中输出。

公开(公告)号：US06373407B1

公开(公告)日：2002-04-16

申请号：US09255733

申请日：1999-02-23

申请人： Takushi Nishiya ,  Tatsuya Hirai ,  Seiichi Mita ,  Takashi Nara ,  Yoichi Uehara ,  Hiroshi Ide ,  Kyoko Tsukano ,  Yoshiju Watanabe

发明人： Takushi Nishiya ,  Tatsuya Hirai ,  Seiichi Mita ,  Takashi Nara ,  Yoichi Uehara ,  Hiroshi Ide ,  Kyoko Tsukano ,  Yoshiju Watanabe

IPC分类号： H03M700

CPC分类号： H03M5/145 ,  G11B20/1426 ,  G11B2020/1446

摘要： The computer system includes a host system, a recording medium, and a digital signal decoder connected to the host system and the recording medium. The digital signal decoder receives M-bit data and generates an N-bit code word from the M-bit data. The number of consecutive bits of 1 in the code word is not larger than a first predetermined number K, and the number of consecutive bits of 0 is not larger than a second predetermined number L. When data is recorded/reproduced by a method such as NRZI (Non-Return to Zero Inverted), or the like, there is a defect in that the number of transitions of data is larger in a code with a high data encoding rate, and the run length of zero is long thereby increasing the data decoding error rate with the recording/reproducing of data. In the digital signal decoder according to the present invention, any code word includes at most 3 consecutive bits of 1, and at most 11 consecutive bits of 0, so that the data decoding error rate can be reduced.

摘要翻译： 计算机系统包括主机系统，记录介质和连接到主机系统和记录介质的数字信号解码器。 数字信号解码器接收M位数据并从M位数据生成N位代码字。 代码字中的连续比特数1不大于第一预定数K，连续比特数0不大于第二预定数L.当通过诸如以下方法记录/再现数据时 NRZI（不归零归零）等，存在数据的转换次数较大的缺点，数据编码速率高的代码，零的行程长，从而增加数据 解码错误率与数据的记录/再现。 在根据本发明的数字信号解码器中，任何代码字包括最多3个连续位1和至多11个连续位0，从而可以减少数据解码错误率。

公开(公告)号：US06320916B1

公开(公告)日：2001-11-20

申请号：US09185097

申请日：1998-11-03

申请人： Naoya Kobayashi ,  Seiichi Mita ,  Masaharu Kondo ,  Hideki Sawaguchi ,  Takashi Moriyasu

发明人： Naoya Kobayashi ,  Seiichi Mita ,  Masaharu Kondo ,  Hideki Sawaguchi ,  Takashi Moriyasu

IPC分类号： H03D100

CPC分类号： H03M13/6331 ,  G11B20/10 ,  G11B20/18 ,  H03M13/09 ,  H03M13/41 ,  H03M13/4115 ,  H03M13/4184 ,  H03M13/6343 ,  H03M13/6502 ,  H03M13/6505 ,  H04L25/03178

摘要： A digital magnetic recording/reproducing apparatus that has an LVA detector, and that is able to maintain the coding rate as high as {fraction (8/9)} or more, and record at a higher density than in the prior art, wherein, in order that the data sequences up to the (2n−1)th best sequence (n>1) are obtained in the order of higher likelihood ratios, and that. the candidates of those data sequences can be produced, the LVA detector has provided therein a unit which replaces the likelihood ratio and path memory of the ith best sequence by those of the (2i−1)th best sequence when the contents of the (i−1)th path memory coincide with those of the ith path memory (i=2, 3, . . . , n) and the absolute value of the likelihood ratio difference between the (i−1)th best sequence and the (2i−1)th best sequence is smaller than a decision threshold, or a unit which initializes the likelihood ratio of the ith best sequence to be a constant difference value added to the likelihood ratio of the (i−1)th best sequence when the contents of the (i−1)th path memory and the ith (i=2, 3, . . . , n) path memory of the n candidates of data sequences are coincident.

摘要翻译： 具有LVA检测器的数字磁记录/再现装置，其能够将编码率保持为高达{分数（8/9）}或更大，并且以比现有技术更高的密度进行记录，其中， 为了获得高达（2n-1）个最佳序列（n> 1）的数据序列是以较高似然比的顺序获得的。 可以产生这些数据序列的候选，LVA检测器在其中提供了一个单元，其当第（i）个（i-1）的内容被替换为第（2i-1）个最佳序列时的第i个最佳序列的似然比和路径存储器 -1）路径存储器与第i路径存储器（i = 2,3，...，n）的路径存储器一致，并且第（i-1）个最佳序列与（2i）的最佳序列之间的似然比差的绝对值 -1）的最佳序列小于判定阈值，或将第i个最佳序列的似然比初始化为当第（i-1）个最佳序列的似然比加到内容的第i-1个最佳序列的似然比时的单位， （i-1）路径存储器和n个候选数据序列的第i（i = 2,3，...，n）路径存储器是一致的。

公开(公告)号：US6144515A

公开(公告)日：2000-11-07

申请号：US229561

申请日：1999-01-13

申请人： Yasutaka Nishida ,  Seiichi Mita ,  Naoki Satoh ,  Yoshiju Watanabe

发明人： Yasutaka Nishida ,  Seiichi Mita ,  Naoki Satoh ,  Yoshiju Watanabe

IPC分类号： G11B5/00 ,  G11B5/02 ,  G11B5/035 ,  G11B5/09 ,  G11B20/10 ,  H03H17/06 ,  G11B5/03

CPC分类号： G11B5/09 ,  G11B20/10009 ,  H03H17/06 ,  G11B2005/0016 ,  G11B5/012 ,  G11B5/035

摘要： The equalizer is capable of generating an equalized output that is compensated in the non-linearity of the signal reproduced by an MR head and a reliable high-density magnetically recorded-signal reproducer. The equalizer of an FIR-type filter structure includes a plurality of delay elements for delaying an input signal by a certain period, a plurality of coefficient processing units provided to input or output taps of the delay elements, and an adder for obtaining the sum of the outputs of the coefficient processing units. The distortion of the reproduced waveform can be corrected by a relatively simple circuit structure by comparing the signal value inputted to the coefficient processing unit from each tap with a predetermined threshold level and changing the signal value and a coefficient value to be multiplied in accordance with the comparison result. Therefore, any one of various existing signal processing systems can be applied to the decoding of reproduced signals of an MR head having the non-linear characteristic.

摘要翻译： 均衡器能够产生均衡的输出，该均衡输出以由MR头和可靠的高密度磁记录信号再现器再现的信号的非线性来补偿。 FIR型滤波器结构的均衡器包括用于将输入信号延迟一定周期的多个延迟元件，提供给输入或输出延迟元件的抽头的多个系数处理单元，以及用于获得 系数处理单元的输出。 通过将输入到系数处理单元的每个抽头的系数处理单元的信号值与预定的阈值电平相比较，可以通过相对简单的电路结构来校正再现波形的失真，并且根据该调整信号值改变信号值和要乘以的系数值 比较结果。 因此，各种现有信号处理系统中的任一种可以应用于具有非线性特性的MR头的再现信号的解码。

公开(公告)号：US5774470A

公开(公告)日：1998-06-30

申请号：US524040

申请日：1995-09-06

申请人： Takushi Nishiya ,  Shoichi Miyazawa ,  Kazutoshi Ashikawa ,  Ryushi Shimokawa ,  Seiichi Mita

发明人： Takushi Nishiya ,  Shoichi Miyazawa ,  Kazutoshi Ashikawa ,  Ryushi Shimokawa ,  Seiichi Mita

IPC分类号： G06F11/10 ,  G11B20/10 ,  G11B20/18 ,  H03H15/00 ,  H03H17/00 ,  H03H21/00 ,  H03M13/23 ,  H03M13/41 ,  H04B3/04

CPC分类号： G11B20/10055 ,  G11B20/10009 ,  G11B20/18 ,  H03M13/41 ,  H03M13/6331 ,  H03M13/6505

摘要： A playback signal processing circuit for reducing decode errors and enabling high-density digital magnetic recording and a digital magnetic recording reproducing unit using the playback signal processing circuit are provided. An estimated waveform generation circuit uses the decoding result of a PRML channel to generate an ideal playback signal waveform. A subtractor provides a waveform representing a difference between the waveform and an actual playback signal. There is a high probability that error bits will occur at an interval of two or four bits because of the nature of GCR code and maximum-likelihood decoding; in the error state of each bit, one bit is incremented by one with respect to the correct bit value and the other signal bit is decremented by one. From this fact, an error detection circuit discriminates an error difference waveform pattern and an error discrimination circuit detects an error bit interval, whereby an error correction circuit carries out error bit correction.

摘要翻译： 提供了一种用于减少解码错误并实现高密度数字磁记录的重放信号处理电路和使用重放信号处理电路的数字磁记录再现单元。 估计波形生成电路使用PRML通道的解码结果来产生理想的重放信号波形。 减法器提供表示波形和实际重放信号之间的差异的波形。 由于GCR码的性质和最大似然解码，错误位将以两位或四位的间隔发生的概率很高; 在每个位的错误状态下，一个比特相对于正确的比特值递增1，另一个比特递减1。 根据该事实，误差检测电路鉴别误差波形图案，误差鉴别电路检测误差位间隔，由此误差校正电路进行错误位校正。

公开(公告)号：US5036524A

公开(公告)日：1991-07-30

申请号：US473251

申请日：1990-01-29

申请人： Johannes W. M. Bergmans ,  Seiichi Mita ,  Morishi Izumita ,  Nobukazu Doi

发明人： Johannes W. M. Bergmans ,  Seiichi Mita ,  Morishi Izumita ,  Nobukazu Doi

IPC分类号： H03M5/14 ,  H03M5/06 ,  H04L25/03 ,  H04L25/49 ,  H04L25/497

CPC分类号： H04L25/497 ,  H04L25/03019

摘要： In a system for transmitting a binary source signal from a data transmitter to a data receiver through a noisy dispersive channel, the data transmitter includes a sliding block encoder which converts the binary source signal at a given symbol rate 1/T into an encoded binary data signal at a symbol rate P/(NT), where P and N are positive integers such that N/P.ltoreq..sup.2 log(3)/2= 0.79248. Since the channel introduces intersymbol interference and noise into the encoded data signal, the data receiver is formed from the cascade of an equalizer, a sampler and a reconstruction circuit which serves to reconstruct the binary source signal at the symbol rate 1/T. The reconstruction circuit includes a detector in a cascade with a decoder having memory the equalizer, sampler and detector are arranged for the detection of a ternary data signal at the symbol rate P/(2NT).

公开(公告)号：US5005184A

公开(公告)日：1991-04-02

申请号：US240196

申请日：1988-09-06

申请人： Tetsuya Amano ,  Seiichi Mita ,  Morishi Izumita ,  Nobukazu Doi ,  Mamoru Kaneko ,  Hiroto Yamauchi ,  Susumu Kasai

发明人： Tetsuya Amano ,  Seiichi Mita ,  Morishi Izumita ,  Nobukazu Doi ,  Mamoru Kaneko ,  Hiroto Yamauchi ,  Susumu Kasai

IPC分类号： H04B3/06 ,  G11B20/10 ,  H03H15/00 ,  H04L25/03

CPC分类号： H04L25/03127 ,  H03H15/00

摘要： A waveform equalization method whereby a transversal filter having 5 or more tapes is included, and a difference signal output, which is obtained when an isolated impulse response waveform of a digital modulated signal is inputted to the above described filter and the output of the filter is inputted to an adder, is allowed to have intersymbol interference at .+-.T/2 with respect to the central axis time and has zero outputs at .+-.nT/2 (where n.gtoreq.2 and n is an integer).

摘要翻译： 包括具有5个或更多个磁带的横向滤波器的波形均衡方法，以及当将数字调制信号的隔离脉冲响应波形输入到上述滤波器并且滤波器的输出是获得的差分信号输出 输入到加法器，允许相对于中心轴时间在+/- T / 2处具有符号间干扰，并且在+/- nT / 2处具有零输出（其中n≥2且n是整数）。

公开(公告)号：US4970707A

公开(公告)日：1990-11-13

申请号：US239389

申请日：1988-09-01

申请人： Fumio Hara ,  Yoshito Tsunoda ,  Shigeru Nakamura ,  Yoshizumi Eto ,  Seiichi Mita ,  Morishi Izumita ,  Hiroyuki Tsuchinaga ,  Masuo Kasai

发明人： Fumio Hara ,  Yoshito Tsunoda ,  Shigeru Nakamura ,  Yoshizumi Eto ,  Seiichi Mita ,  Morishi Izumita ,  Hiroyuki Tsuchinaga ,  Masuo Kasai

IPC分类号： G11B7/003 ,  G11B7/09

CPC分类号： G11B7/09 ,  G11B7/0031 ,  G11B7/0925

摘要： 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.

摘要翻译： 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。

公开(公告)号：US4764927A

公开(公告)日：1988-08-16

申请号：US909336

申请日：1986-09-19

申请人： Morishi Izumita ,  Seiichi Mita ,  Nobukazu Doi ,  Fuyuki Inui ,  Akira Saito ,  Mamoru Kaneko

发明人： Morishi Izumita ,  Seiichi Mita ,  Nobukazu Doi ,  Fuyuki Inui ,  Akira Saito ,  Mamoru Kaneko

IPC分类号： H03M13/00 ,  G11B20/18 ,  H03M13/29 ,  G06F11/10

CPC分类号： H03M13/29

摘要： An error detection and/or correction is achieved in the horizontal direction in a block and then an error state is determined by use of an error correction in the vertical direction; furthermore, the correcting system is changed over according to the result of the determination.

摘要翻译： 在块中的水平方向上实现错误检测和/或校正，然后通过使用垂直方向的纠错来确定错误状态; 此外，根据确定的结果来改变校正系统。