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    • 25. 发明授权
    • Disk changer type disk player
    • 磁盘更换器类型磁盘播放器
    • US06760284B2
    • 2004-07-06
    • US10232600
    • 2002-09-03
    • Hideki KumeTakayuki MurakamiTetsuya Tamura
    • Hideki KumeTakayuki MurakamiTetsuya Tamura
    • G11B2108
    • G11B17/226G11B7/00
    • A rotary tray having a plurality of disk mounting sections is pivotally supported by a central shaft arranged on a tray support face of a casing, a rim protruding from a lower face of the rotary tray is movably set on a sliding face block arranged in an outer circumferential section of the tray support face, and disk mounted on a desired disk mounting section is opposed to an optical pickup when the rotary tray is intermittently rotated by a predetermined angle, and the sliding face block is engaged in a space formed between a recess step circumferential face, which is formed along an inner edge of an outer circumferential section of the tray support face, and a support frame integrally formed in the outer circumferential section and being opposed to the recess step circumferential face.
    • 具有多个盘安装部的旋转托盘由设置在壳体的托盘支撑面上的中心轴枢转地支撑,从旋转托盘的下表面突出的边缘可移动地设置在布置在外部的滑动面块上 托盘支撑面的周向部分,并且当旋转托盘间歇地旋转预定角度时,安装在期望的盘安装部分上的盘与光学拾取器相对,并且滑动面块接合在形成在凹槽 沿着托盘支撑面的外周部的内缘形成的圆周面以及与外周部一体形成并与凹部的台阶周面相对的支撑框架。
    • 26. 发明授权
    • Soft error correction algebraic decoder
    • 软错误校正代数解码器
    • US06553536B1
    • 2003-04-22
    • US09611872
    • 2000-07-07
    • Martin Aureliano HassnerRichard Michael Hamilton NewArvind Motibhai PatelTetsuya TamuraBarry Marshall Trager
    • Martin Aureliano HassnerRichard Michael Hamilton NewArvind Motibhai PatelTetsuya TamuraBarry Marshall Trager
    • H03M1300
    • H03M13/154H03M13/1515H03M13/45H03M13/455
    • A soft error correction algebraic decoder and an associated method use erasure reliability numbers to derive error locations and values. More specifically, symbol reliability numbers from a maximum likelihood (ML) decoder as well as a parity check success/failure from inner modulation code symbols are combined by a Reed-Solomon decoder in an iterative manner, such that the ratio of erasures to errors is maximized. The soft error correction (ECC) algebraic decoder and associated method decode Reed Solomon codes using a binary code and detector side information. The Reed Solomon codes are optimally suited for use on erasure channels. A threshold adjustment algorithm qualifies candidate erasures based on a detector error filter output as well as modulation code constraint success/failure information, in particular parity check or failure as current modulation codes in disk drive applications use parity checks. This algorithm creates fixed erasure inputs to the Reed Solomon decoder. A complementary soft decoding algorithm of the present invention teaches the use of a key equation solver algorithm that calculates error patterns obtained as a solution to a weighted rational interpolation problem with the weights given by the detector side information.
    • 软错误纠正代数解码器和相关方法使用擦除可靠性数字来导出错误位置和值。 更具体地,来自最大似然(ML)解码器的符号可靠性数字以及来自内部调制码符号的奇偶校验成功/失败由Reed-Solomon解码器以迭代方式组合,使得擦除与误差的比率为 最大化。 软纠错(ECC)代数解码器和相关方法使用二进制码和检测器侧信息对Reed Solomon码进行解码。 Reed Solomon码最适合用于擦除通道。 阈值调整算法基于检测器误差滤波器输出以及调制码约束成功/失败信息(特别是奇偶校验或故障)来限定候选擦除,因为磁盘驱动器应用中的当前调制码使用奇偶校验。 该算法为Reed Solomon解码器创建固定的擦除输入。 本发明的补码软解码算法教导了使用由检测器侧信息给出的权重来计算作为加权有理插值问题的解的方法获得的误差模式的密钥方程求解算法。
    • 27. 发明授权
    • ECC block format for storage device
    • 用于存储设备的ECC块格式
    • US06357030B1
    • 2002-03-12
    • US09216014
    • 1998-12-16
    • Masayuki DemuraTetsuya TamuraAkira SasakiHiroshi Itagaki
    • Masayuki DemuraTetsuya TamuraAkira SasakiHiroshi Itagaki
    • H03M1315
    • H03M13/1515G11B20/1813H03M13/29H03M13/2903H03M13/2909
    • A method and apparatus for efficiently encoding an ECC block for improving writing performance of a storage device using an ECC block format having a linear code such as a Reed-Solomon code is described. When the data f1 of a part of data sectors among a plurality of data sectors which form an ECC block F1 having a PO portion q1 formed with a linear code such as a Reed-Solomon code is updated with data f2 to obtain the ECC block F2 having the updated PO portion q2, the ECC block F1+F2 of the exclusive OR of the source data part of the ECC block F1 before updating and the ECC block F2 after updating is taken, so that the XOR of f1 and f2 (i.e. f1+f2) of the data f1 to be updated and the updated data f2 is obtained. The XOR of non-updated data sectors is 0. Then, when the ECC block F1+F2 of the XOR is encoded, the PO portion in the form of the XOR q1+q2 is obtained in accordance with the linearity of the Reed-Solomon code. Thus, q2 can be gained based on the exclusive OR of q1+q2 and q1, resulting in the ability to write out the data more efficiently.
    • 描述了一种使用具有诸如里德 - 索罗门码等线性码的ECC块格式来有效地编码用于提高存储装置的写入性能的ECC块的方法和装置。 当用数据f2更新形成具有诸如Reed-Solomon码的线性码形成的PO部分q1的ECC块F1的多个数据扇区中的数据扇区的数据f1,以获得ECC块F2 具有更新的PO部分q2时,获取更新前的ECC块F1的源数据部分与更新后的ECC块F2的异或的ECC块F1 + F2,使得f1和f2的XOR(即f1 + f2),并且获得更新数据f2。 未更新的数据扇区的异或为0.然后,当XOR的ECC块F1 + F2被编码时,根据Reed-Solomon的线性度,获得XOR q1 + q2形式的PO部分 码。 因此,可以基于q1 + q2和q1的异或获得q2,从而能够更有效地写入数据。
    • 30. 发明授权
    • Maximum-likelihood symbol detection for RLL-coded data
    • RLL编码数据的最大似然符号检测
    • US5638065A
    • 1997-06-10
    • US489863
    • 1995-06-13
    • Martin A. HassnerTetsuya TamuraShmuel Winograd
    • Martin A. HassnerTetsuya TamuraShmuel Winograd
    • G11B20/10G11B20/14G11B20/18H03M7/00
    • G11B20/1426G11B20/10009
    • Parallel ML processing of an analog signal in a RLL-coded channel in which (1) vectors for a current state of the channel and the next state of the channel are computed using Walsh transform vector coefficients of the analog signal; (2) current state vectors and next state vectors and values of vectors precomputed in analog matched filters are used to generate vector scalar products which are compared against preselected threshold values for generating binary decision outputs that are used in digital sequential finite state machines to generate ML symbol decisions; and (3) ML symbol decisions are fed back and used to subtract the intersymbol interference value of the current state vector from the vector of the next state to transform the next state vector into an updated current state vector.
    • RLL编码信道中的模拟信号的并行ML处理,其中(1)信道的当前状态的向量和信道的下一状态的矢量使用模拟信号的沃尔什变换矢量系数来计算; (2)当前状态矢量和下一状态向量以及在模拟匹配滤波器中预先计算的矢量值用于产生与预选阈值进行比较的矢量标量积,用于产生在数字顺序有限状态机中使用的二进制判决输出以产生ML 符号决定 (3)ML符号决定被反馈并用于从下一状态的向量中减去当前状态向量的符号间干扰值,以将下一状态向量变换为更新的当前状态向量。