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1. 发明授权

US07965461B2 Information reproducing apparatus 有权
标题翻译：信息重放装置
公开(公告)号：US07965461B2
公开(公告)日：2011-06-21
申请号：US11606030
申请日：2006-11-30
申请人： Takao Sugawara , Jun Lee
发明人： Takao Sugawara , Jun Lee
IPC分类号： G11B20/10
CPC分类号： G11B20/10009 , G11B20/10333
摘要： An information reproducing apparatus which reproduces information recorded on a medium includes an asymmetry correction circuit configured to correct an asymmetry of a signal read from a medium. The apparatus also includes a first high pass filter installed before the asymmetry correction circuit and configured to remove noise in the signal by a first cut-off frequency. The apparatus also includes a second high pass filter installed after the asymmetry correction circuit and configured to remove the noise in the signal by a second cut-off frequency, wherein the second cut-off frequency is higher than the first cut-off frequency.
摘要翻译：再现记录在介质上的信息的信息再现装置包括：非对称校正电路，被配置为校正从介质读取的信号的不对称性。该装置还包括安装在不对称校正电路之前的第一高通滤波器，并且被配置为通过第一截止频率去除信号中的噪声。该装置还包括安装在不对称校正电路之后的第二高通滤波器，并且被配置为通过第二截止频率去除信号中的噪声，其中第二截止频率高于第一截止频率。

2. 发明授权

US07515369B2 Information recording and reproducing apparatus and method, and signal decoding circuit for performing timing recovery 失效
标题翻译：信息记录和再现装置和方法以及用于执行定时恢复的信号解码电路
公开(公告)号：US07515369B2
公开(公告)日：2009-04-07
申请号：US11388377
申请日：2006-03-24
申请人： Takao Sugawara , Motomu Takatsu , Masaru Sawada
发明人： Takao Sugawara , Motomu Takatsu , Masaru Sawada
IPC分类号： G11B5/09
CPC分类号： G11B20/10009 , G11B5/09 , G11B20/18
摘要： A timing recovery unit detects a phase offset and a frequency offset from a head area of reproduction data and initially corrects them. The timing recovery unit stores data in which a head reproduction signal has been made to be discrete by a fixed clock into a buffer. A phase offset detector detects the phase offset from the data head area in parallel with the operation for writing the data into the buffer. At the same time, a frequency offset detector detects the frequency offset from the data head area in parallel with the operation for writing the data into the buffer. A correction value of the detected phase offset and a correction value of the detected frequency offset are initially set into a digital PLL. While the data is read out from the buffer, a frequency lead-in and a phase lead-in are executed in the head area.
摘要翻译：定时恢复单元从再现数据的头部区域检测相位偏移和频率偏移，并且最初校正它们。定时恢复单元将已经通过固定时钟将头重放信号离散的数据存储到缓冲器中。相位偏移检测器与将数据写入缓冲器的操作并行地检测与数据头区域的相位偏移。同时，频率偏移检测器与将数据写入缓冲器的操作并行地检测数据头区域的频率偏移。检测到的相位偏移的校正值和检测到的频率偏移的校正值最初被设置为数字PLL。当从缓冲器中读出数据时，在头部区域中执行频率导入和相位导入。

3. 发明申请

US20060132956A1 Disk writing/reproducing apparatus and method 失效
标题翻译：磁盘写入/再现装置和方法
公开(公告)号：US20060132956A1
公开(公告)日：2006-06-22
申请号：US11302379
申请日：2005-12-14
申请人： Yong-kyu Byun , Takao Sugawara
发明人： Yong-kyu Byun , Takao Sugawara
IPC分类号： G11B5/09 , G11B20/10 , G11B19/02
CPC分类号： G11B5/40 , G11B5/02 , G11B19/04 , G11B20/10009 , G11B2005/001
摘要： A disk writing apparatus includes: a temperature sensor sensing an ambient temperature of a disk; a sync mark generator generating a sync mark having a pattern when a writing temperature indicating an ambient temperature at which data is written on the disk is sensed, wherein the pattern of the sync mark corresponds to the sensed writing temperature; a writing controller outputting the writing temperature sensed by the temperature sensor to the sync mark generator; a multiplexer adding the sync mark generated by the sync mark generator to the data; and a writing unit writing the data to which the sync mark is added on the disk. Accordingly, error rates when data is written and when data is reproduced can be improved by optimally compensating for the disk writing temperature and the disk reproducing temperature using parameters of devices of an hard disk drive.
摘要翻译：磁盘写入装置包括：感测盘的环境温度的温度传感器; 感测到当指示将数据写在盘上的环境温度的写入温度时产生具有图案的同步标记发生器，其中同步标记的图案对应于感测到的写入温度; 写入控制器，将由温度传感器感测到的写入温度输出到同步标记发生器; 多路复用器将由同步标记产生器产生的同步标记加到数据中; 以及写入单元将在其上添加了同步标记的数据写入到磁盘上。因此，通过使用硬盘驱动器的设备的参数最佳地补偿磁盘写入温度和磁盘再现温度，可以提高数据写入和数据再现时的错误率。

4. 发明授权

US06501610B1 Detecting circuit for read signal from magnetic recording system using partial response 失效
标题翻译：使用部分响应从磁记录系统读取信号的检测电路
公开(公告)号：US06501610B1
公开(公告)日：2002-12-31
申请号：US08596471
申请日：1996-02-05
申请人： Takao Sugawara , Umeo Oshio , Takenori Ohshima , Yoshifumi Mizoshita , Keiji Aruga
发明人： Takao Sugawara , Umeo Oshio , Takenori Ohshima , Yoshifumi Mizoshita , Keiji Aruga
IPC分类号： G11B509
CPC分类号： G11B20/10055 , G11B5/09 , G11B20/10009 , G11B20/1258
摘要： A detection circuit in a magnetic recording and playback apparatus which uses partial response and the maximum likelihood method, in which neither the size of the detection circuit nor the power consumption increase when the partial response order n increases. In this detection circuit, in the circuit that detects a signal read out from a head, either a plurality of equalizers for different target equalization waveforms, or a single variable target equalizer is provided. A detector for the waveform output from an equalizer is connected in series with the detector. A plurality of combinations, each formed by an equalizer and a detector, is connected in parallel to the output of a filter, the outputs of the combinations of equalizers and detectors being input to a switching circuit, which is controlled by a switching control means. The switching control means controls the switching circuit so that just one of the combinations of equalizer and detectors is selected as the detector output. If a variable target equalizer, which is capable of generating two or more different types of equalization waveforms, is used as the equalizer, it is possible to reduce the number of equalizers to one.
摘要翻译：使用部分响应和最大似然方法的磁记录和重放装置中的检测电路，其中当部分响应顺序n增加时，检测电路的尺寸和功耗都不会增加。在该检测电路中，在检测从头读出的信号的电路中，提供用于不同的目标均衡波形的多个均衡器或单个可变目标均衡器。用于从均衡器输出的波形的检测器与检测器串联连接。由均衡器和检测器形成的多个组合与滤波器的输出并联连接，均衡器和检测器组合的输出被输入到由开关控制装置控制的开关电路。开关控制装置控制开关电路，使得仅选择均衡器和检测器的组合中的一个作为检测器输出。如果能够产生两种或多种不同类型的均衡波形的可变目标均衡器被用作均衡器，则可以将均衡器的数量减少到1。

5. 发明授权

US5892474A Clock phase acquisition/tracking device and phase acquisition method 失效
标题翻译：时钟相位采集/跟踪装置及相位采集方法
公开(公告)号：US5892474A
公开(公告)日：1999-04-06
申请号：US944888
申请日：1997-10-06
申请人： Takao Sugawara
发明人： Takao Sugawara
IPC分类号： G11B20/14 , H03L7/00 , H03L7/081 , H03L7/091 , H04L7/02 , H03M1/00
CPC分类号： H04L7/0062 , G11B20/10055 , G11B20/1403 , H03L7/081 , H03L7/091
摘要： A clock phase acquisition/tracking device comprises a phase error operation section for operating a phase error of a quantized signal to a given quantization timing and a clock generation section for generating a clock at a given phase based on a phase error information operated in the phase error operation section. For the resulting quantized signal, a determination is made using a threshold set based on a previously quantized signal when the phase error is operated in the phase error operation section upon the beginning of the clock phase acquisition. Thus, the time necessary for the phase aquisition can be shortened.
摘要翻译：时钟相位采集/跟踪装置包括：相位误差运算部分，用于将量化信号的相位误差运算到给定的量化定时;以及时钟产生部分，用于基于在相位操作的相位误差信息在给定相位产生时钟错误操作部分。对于所得到的量化信号，当在时钟相位采集开始时在相位误差操作部分中操作相位误差时，使用基于先前量化信号的阈值进行确定。因此，可以缩短相位采集所需的时间。

6. 发明授权

US5880904A Disk drive having a thickness equal to an IC memory card 失效
标题翻译：磁盘驱动器的厚度等于IC存储卡
公开(公告)号：US5880904A
公开(公告)日：1999-03-09
申请号：US406807
申请日：1995-03-20
申请人： Yoshifumi Mizoshita , Tomoyoshi Yamada , Yasumasa Kuroba , Toru Kouhei , Takao Sugawara , Masaru Matsumoto , Hiroyuki Mase , Masao Tsunekawa , Shinji Koganezawa , Keiji Aruga
发明人： Yoshifumi Mizoshita , Tomoyoshi Yamada , Yasumasa Kuroba , Toru Kouhei , Takao Sugawara , Masaru Matsumoto , Hiroyuki Mase , Masao Tsunekawa , Shinji Koganezawa , Keiji Aruga
IPC分类号： G11B5/54 , G11B17/028 , G11B19/20 , G11B21/12 , G11B21/22 , G11B25/04 , G11B33/08 , G11B33/12 , H02K7/04 , H02K7/08 , H02K21/24 , H02K33/18 , H02K41/035 , G11B5/012
CPC分类号： G11B33/121 , G11B17/028 , G11B17/0282 , G11B17/0287 , G11B19/20 , G11B19/2009 , G11B21/12 , G11B21/22 , G11B25/043 , G11B33/08 , G11B33/122 , G11B5/54 , H02K21/24 , H02K33/18 , H02K41/0358 , H02K7/04 , H02K7/086
摘要： A compact card type disk drive includes a housing (21) for accommodating a disk for storing data, disk drive for rotating the disk, a head assembly for writing and reading data to and from the disk and an electronic circuit including at least an interface circuit (39), the latter three being accommodated in the housing. A connector (42) connected to the electronic circuit is fixed to the outside portion of the housing (21). The electronic circuit preferably contains a read/write circuit (36) and a control circuit (38). The housing (21) preferably includes a lower base (22) and an upper cover (23), and a printed circuit board (14) is disposed along the inner wall of either one, or both, of the base (22) and the cover (23). The outer dimension of the plane of the disk drive is preferably about 85.6 mm.times.54 mm, and typically, the outer thickness is 5 mm. Preferably, one connector (42) is disposed on either one of the minor sides of the housing (21). The connector (42) is disposed at the substantial center of the housing in the direction of its thickness and is fixed to one of the minor sides of the housing (21) which opposes the head assembly with respect to the disk.
摘要翻译：一种紧凑型卡式磁盘驱动器包括用于容纳用于存储数据的盘的壳体（21），用于旋转盘的盘驱动器，用于向盘进行数据读取和从盘读取数据的头组件和至少包括接口电路（39），后三个被安置在房屋内。连接到电子电路的连接器（42）固定到壳体（21）的外部。电子电路优选地包含读/写电路（36）和控制电路（38）。壳体（21）优选地包括下基部（22）和上盖（23），并且印刷电路板（14）沿着基座（22）的一个或两个的内壁设置，并且盖（23）。磁盘驱动器的平面的外部尺寸优选为约85.6mm×54mm，并且通常外部厚度为5mm。优选地，一个连接器（42）设置在壳体（21）的任一个次侧上。连接器（42）沿其厚度方向设置在壳体的大致中心处并且被固定到相对于盘相对于头组件的壳体（21）的一个小侧。

7. 发明授权

US5432820A Maximum-likelihood decoding method and device 失效
标题翻译：最大似然解码方法和装置
公开(公告)号：US5432820A
公开(公告)日：1995-07-11
申请号：US910311
申请日：1993-07-26
申请人： Takao Sugawara , Yoshifumi Mizoshita , Takashi Aikawa , Hiroshi Mutoh , Kiichirou Kasai
发明人： Takao Sugawara , Yoshifumi Mizoshita , Takashi Aikawa , Hiroshi Mutoh , Kiichirou Kasai
IPC分类号： H03M13/39 , H03D1/00 , H04L27/06
CPC分类号： H03M13/39
摘要： A maximum-likelihood decoding method for decoding an input signal subject to intersymbol interference. An assumption is made of a measure of an interference caused by a future signal that is later in a sequence than an assumed data sequence, on the basis of a predetermined bits of sample values of said input signal that are earlier in a sequence than an assumed data sequence stored in an assumed path memory (104). An assumed sample value of said input signal by referring to this measure of interference. Maximum-likelihood decoding is conducted on said input signal, on the basis of this assumed sample value and a sample value of said input signal; a plurality of survivor paths are generated and stored in a path memory (102); data for the most likely one of survivor paths is output as a decoded data sequence.
摘要翻译： PCT No.PCT / JP91 / 01579 Sec。 371日期：1993年7月26日 102（e）日期1993年7月26日PCT 1991年11月19日PCT PCT。出版物WO92 / 09144 日期：1992年5月29日。用于解码符号间干扰的输入信号的最大似然解码方法。基于序列中比预期的序列更早的所述输入信号的采样值的预定比特，假定由比未被假定的数据序列晚于序列的未来信号引起的干扰的度量存储在假定路径存储器（104）中的数据序列。通过参考这种干扰措施，假定所述输入信号的采样值。基于该假设采样值和所述输入信号的采样值对所述输入信号进行最大似然解码; 多个幸存路径被生成并存储在路径存储器（102）中; 作为解码数据序列输出最可能的幸存路径之一的数据。

8. 发明授权

US07590929B2 Record reproduction method, apparatus, and circuit for using error correcting code 有权
标题翻译：使用纠错码的记录再现方法，装置和电路
公开(公告)号：US07590929B2
公开(公告)日：2009-09-15
申请号：US10869585
申请日：2004-06-16
申请人： Toshihiko Morita , Mitsuhiko Ohta , Takao Sugawara
发明人： Toshihiko Morita , Mitsuhiko Ohta , Takao Sugawara
IPC分类号： H03M13/00
CPC分类号： H03M13/6325 , G11B20/1833 , G11B20/1866 , G11B2020/1863 , H03M13/1102 , H03M13/1515 , H03M13/17 , H03M13/3746
摘要： A record reproduction apparatus includes an encoding unit that encodes sector data to be written into a recording medium, by dividing the data into a predetermined number of blocks, and an iterative decoding unit that iteratively decodes the sector data read from the recording medium, by dividing the sector data into the predetermined number of blocks.
摘要翻译：记录重放装置包括编码单元，其通过将数据划分成预定数量的块来编码要写入记录介质的扇区数据，以及迭代解码单元，其对从记录介质读取的扇区数据进行迭代解码，将扇区数据转换成预定数量的块。

9. 发明授权

US07355938B2 Timing recovery method and storage apparatus for suppressing control of sampling positions 失效
标题翻译：用于抑制采样位置的控制的定时恢复方法和存储装置
公开(公告)号：US07355938B2
公开(公告)日：2008-04-08
申请号：US10359999
申请日：2003-02-06
申请人： Akihiro Yamazaki , Takao Sugawara
发明人： Akihiro Yamazaki , Takao Sugawara
IPC分类号： G11B7/00
CPC分类号： G11B20/10055 , G11B20/10009 , G11B20/10037 , G11B20/10296 , G11B20/1403 , H03L7/091 , H03M13/41 , H03M13/6331
摘要： A timing recovery method samples, equalizes and detects a signal reproduced from a recording medium and to output a detection signal, controls sampling positions based on a phase error between the equalized signal and the detection signal, and obtains likelihood information which is related to a bit having a probability of error which exceeds a predetermined value, based on the equalized signal. The control of the sampling positions is suppressed during a time which is based on the likelihood information.
摘要翻译：定时恢复方法采样，均衡和检测从记录介质再现的信号并输出检测信号，基于均衡信号和检测信号之间的相位误差控制采样位置，并获得与位相关的似然信息具有基于均衡信号的超过预定值的误差概率。在基于似然信息的时间内抑制采样位置的控制。

10. 发明授权

US07286596B2 Training method for recording medium reproduction equalizer and recording medium reproduction apparatus 失效
标题翻译：用于记录媒体再现均衡器和记录介质再现装置的训练方法
公开(公告)号：US07286596B2
公开(公告)日：2007-10-23
申请号：US10722915
申请日：2003-11-26
申请人： Masaru Sawada , Motomu Takatsu , Takao Sugawara
发明人： Masaru Sawada , Motomu Takatsu , Takao Sugawara
IPC分类号： H03H7/30 , H03K5/159
CPC分类号： G11B20/10046 , G11B20/10009 , G11B20/10481
摘要： In a training operation for optimizing a multiplication coefficient for each tap of an FIR equalizer equalizing a read signal read from a recording medium, as a restricted coefficient updating vector applied for updating the multiplication coefficient for each tap of an FIR filter, a vector is utilized which is obtained by projecting, onto a plane perpendicular to a predetermined restricting conditioning vector, a coefficient updating vector determined based on an equalizer error between the output of the FIR equalizer and a reproduction output determined therefrom and a delayed input value for each tap of the FIR equalizer. As the restricting conditioning vector, a vector is utilized which is a difference between a subsequent coefficient vector obtained in the same condition immediately subsequent to and an antecedent coefficient vector obtained in the same condition immediately antecedent to a reference coefficient comprising the multiplication coefficient for the equalizer obtained upon calculating the equalizer error.
摘要翻译：在用于优化均衡从记录介质读取的读取信号的FIR均衡器的每个抽头的乘法系数的训练操作中，作为用于更新FIR滤波器的每个抽头的乘法系数的受限系数更新向量，使用向量其通过将垂直于预定的限制调节向量的平面投影到基于FIR均衡器的输出与由其确定的再现输出之间的均衡器误差确定的系数更新向量和每个抽头的每个抽头的延迟输入值而获得 FIR均衡器作为限制调节向量，使用这样的矢量，该矢量是在紧随其后的相同条件下获得的后续系数矢量与在与包括均衡器的乘法系数的参考系数紧邻的相同条件下获得的先前系数矢量之间的差值在计算均衡器误差时获得。

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