公开(公告)号：US20120026850A1

公开(公告)日：2012-02-02

申请号：US13251874

申请日：2011-10-03

Applicant: Youichi Ogura ,  Noriyuki Masunari ,  Yorikazu Takao

Inventor： Youichi Ogura ,  Noriyuki Masunari ,  Yorikazu Takao

IPC: G11B20/18

CPC classification number: G11B20/10212

Abstract: An instantaneous jitter information detection section detects, based on first and second digital values indicating different polarities relative to a predetermined reference value, an instantaneous gradient value corresponding to a difference value between the first and second digital values, and an instantaneous deviation value corresponding to a difference value between an intermediate value between the first and second digital values and the reference value. An information conversion section converts, based on an inversely proportional conversion table, the instantaneous gradient value to an inversely proportional value. An arithmetic section detects an instantaneous variance value by multiplying the instantaneous deviation value and the inversely proportional value together, and squaring a value obtained by the multiplication, and detects an integrated value by accumulating the instantaneous variance value. A standard deviation detection section detects a square root of a mean value of the integrated value as the absolute jitter value.

Abstract translation: 瞬时抖动信息检测部分根据相对于预定参考值指示不同极性的第一和第二数字值检测对应于第一和第二数字值之间的差值的瞬时梯度值和对应于 第一和第二数字值之间的中间值与参考值之间的差值。 信息转换部分将基于逆比例转换表将瞬时梯度值转换为反比例值。 算术部分通过将瞬时偏差值和反比例值相乘并检测通过乘法获得的值的平方来检测瞬时方差值，并且通过累加瞬时方差值来检测积分值。 标准差检测部检测积分值的平均值的平方根作为绝对抖动值。

公开(公告)号：US07852728B2

公开(公告)日：2010-12-14

申请号：US11995634

申请日：2006-07-20

Applicant: Youichi Ogura ,  Tatsushi Hiraki ,  Yorikazu Takao

Inventor： Youichi Ogura ,  Tatsushi Hiraki ,  Yorikazu Takao

IPC: G11B7/00

CPC classification number: G11B20/10009 ,  G11B20/10046 ,  G11B20/10055 ,  G11B20/10083 ,  G11B20/10101 ,  G11B20/10111 ,  G11B20/10222 ,  G11B20/1403 ,  G11B2020/1287 ,  G11B2220/2562 ,  G11B2220/2575

Abstract: A digital signal reproducing apparatus includes an analog to digital converter for sampling and quantizing a signal read from an optical recording medium in accordance with a reproduced clock having a frequency which is one-half of a channel bit frequency and outputting an obtained digital RF signal, an offset compensation circuit for reducing an offset component in an amplitude direction from the digital RF signal, and a simplified interpolation filter for reconstructing a signal indicating a predetermined pattern recorded in the optical recording medium from the output signal of the offset compensation circuit and outputting the reconstructed signal. A control operation is performed to reduce the magnitudes of respective values shown by first phase error information on a section with the predetermined pattern and by second phase error information on a section other than the section with the predetermined pattern.

Abstract translation: 一种数字信号再生装置，具有模拟数字转换器，用于根据具有频率为通道位频率的二分之一的频率的再生时钟对从光记录介质读取的信号进行采样和量化，并输出所获得的数字RF信号， 偏移补偿电路，用于减少来自数字RF信号的振幅方向上的偏移分量;以及简化内插滤波器，用于根据偏移补偿电路的输出信号重建指示记录在光学记录介质中的预定模式的信号，并输出 重建信号。 执行控制操作以减小具有预定模式的部分上的第一相位误差信息所示的各个值的大小以及除了具有预定模式的部分之外的部分的第二相位误差信息。

公开(公告)号：US07778134B2

公开(公告)日：2010-08-17

申请号：US11917253

申请日：2006-07-20

Applicant: Seiji Matsui ,  Youichi Ogura

Inventor： Seiji Matsui ,  Youichi Ogura

IPC: G11B7/00

CPC classification number: G11B20/10009 ,  H04L25/03038

Abstract: A waveform equalization control device includes a waveform equalizer that has a filter provided with a plurality of taps, updates the tap coefficient of each of the plurality of taps in accordance with a tap coefficient signal inputted thereto, causes the plurality of taps to respectively receive a plurality of values sampled at different time points from an input signal, performs waveform equalization with respect to the input signal, and outputs the signal after the waveform equalization, an equalization target value generation unit for determining an equalization target value, an error estimation unit for obtaining the error between the equalization target value and the signal after the waveform equalization, and a coefficient update unit for determining an amount of updating the coefficient of each of the taps of the filter of the waveform equalizer based on the error signal and on the input value to each of the taps and outputting the amount of updating the tap coefficient as the tap coefficient signal. The equalization target value generation unit obtains sign signals each showing whether the signal after the waveform equalization has a positive value or a negative value for first to fifth time points and determines a value corresponding to a total sum which is a sum of respective results of multiplying the sign signals for the first to fifth time points by θ, β, α, β, and θ (where each of α, β, and θ is a predetermined real number) as the equalization target value.

Abstract translation: 波形均衡控制装置包括波形均衡器，其具有设置有多个抽头的滤波器，根据输入的抽头系数信号来更新多个抽头中的每一个的抽头系数，使多个抽头分别接收 在输入信号的不同时间点采样的多个值对输入信号进行波形均衡，输出波形均衡后的信号，确定均衡目标值的均衡目标值生成单元，用于确定均衡目标值的差分估计单元 获得均衡目标值和波形均衡后的信号之间的误差;以及系数更新单元，用于基于误差信号和输入来确定更新波形均衡器的滤波器的每个抽头的系数的量 值，并输出更新抽头系数的量 抽头系数信号。 均衡目标值生成单元获得各自表示波形均衡后的信号是否具有第一至第五时间的正值或负值的符号信号，并且确定对应于作为乘法的各个结果的和的总和的值 第一至第五时间点的符号信号由＆thetas;＆bgr;α，＆bgr;和＆thetas; （其中α，＆bgr，和...中的每一个是预定实数）作为均衡目标值。

公开(公告)号：US07558177B2

公开(公告)日：2009-07-07

申请号：US11344184

申请日：2006-02-01

Applicant: Youichi Ogura ,  Shinichi Konishi

Inventor： Youichi Ogura ,  Shinichi Konishi

IPC: G11B7/00

CPC classification number: G11B20/10055 ,  G11B20/10037 ,  G11B20/10046 ,  G11B20/10083 ,  G11B20/10101 ,  G11B20/10111 ,  G11B20/10166 ,  G11B20/10203 ,  G11B20/10212 ,  G11B20/10222 ,  G11B20/1876 ,  G11B2220/2537

Abstract: After a playback RF signal 3 detected from an optical disc medium 1 is waveform-shaped, it is converted into a digital RF signal 6 with a sampling clock 8 having a cycle twice as long as a channel clock. Thereafter, a first offset correction circuit 9 corrects an offset fluctuation in a high frequency band, and a digital adaptive equalizer 23 performs adaptive equalization, and then a second offset correction circuit 27 corrects an offset component that remains after the offset correction by the first offset correction circuit 9, thereby demodulating a digital binary signal 37. Therefore, even when high-speed playback is carried out and an asymmetry depending on the recording quality is large, a reduction in power consumption can be realized while maintaining high-performance playback. Consequently, it is possible to provide an optical disc playback apparatus which can realize sufficient playback performance at low power consumption.

Abstract translation: 在从光盘介质1检测到的重放RF信号3是波形的之后，它被转换成具有采样时钟8的数字RF信号6，采样时钟8的周期是通道时钟的两倍。 此后，第一偏移校正电路9校正高频带中的偏移波动，并且数字自适应均衡器23执行自适应均衡，然后第二偏移校正电路27将偏移校正之后剩余的偏移分量校正为第一偏移 校正电路9，从而解调数字二进制信号37.因此，即使执行高速重放，并且取决于记录质量的不对称性大，可以在保持高性能回放的同时实现功耗的降低。 因此，可以提供能够以低功耗实现充分的播放性能的光盘播放装置。

公开(公告)号：US07539097B2

公开(公告)日：2009-05-26

申请号：US11234212

申请日：2005-09-26

Applicant: Youichi Ogura ,  Toshihiko Takahashi ,  Teruhiko Izumi ,  Shinichi Konishi ,  Hironori Deguchi ,  Takamasa Sakai

Inventor： Youichi Ogura ,  Toshihiko Takahashi ,  Teruhiko Izumi ,  Shinichi Konishi ,  Hironori Deguchi ,  Takamasa Sakai

IPC: G11B20/00

CPC classification number: G11B20/10009 ,  G11B7/131 ,  G11B20/1403 ,  G11B2020/122 ,  G11B2020/1239 ,  G11B2020/1268

Abstract: An optical disk device is provided with a first analog-to-digital converter for converting a push-pull signal detected from an optical disc medium into a digital sampling signal according to a sampling clock in the vicinity of a channel frequency. The optical disk device also includes an address polarity information detection circuit for detecting address polarity information from the digital sampling signal, and an address position information detection circuit for detecting address position information from the digital sampling signal while maintaining continuity.

Abstract translation: 光盘装置具有第一模数转换器，用于根据通道频率附近的采样时钟将从光盘介质检测到的推挽信号转换为数字采样信号。 光盘装置还包括用于从数字采样信号检测地址极性信息的地址极性信息检测电路，以及用于在保持连续性的同时从数字采样信号检测地址位置信息的地址位置信息检测电路。

公开(公告)号：US07525887B2

公开(公告)日：2009-04-28

申请号：US10871062

申请日：2004-06-21

Applicant: Youichi Ogura ,  Toshihiko Takahashi ,  Kazutoshi Aida ,  Kouji Okamoto

Inventor： Youichi Ogura ,  Toshihiko Takahashi ,  Kazutoshi Aida ,  Kouji Okamoto

IPC: G11B15/52

CPC classification number: G11B20/10425 ,  G11B20/10009 ,  G11B20/10037 ,  G11B20/10055 ,  G11B20/10222 ,  G11B20/1403 ,  G11B20/22 ,  G11B2020/1288 ,  G11B2220/2541

Abstract: When generating a sampling clock of an A/D converter for digitizing a playback signal from an optical disc, an over sampling clock generated by a PLL is used. Further, zerocross position information and reference information of a playback digital signal that is obtained by A/D conversion using the over sampling clock are converted into those synchronized with the channel bit clock by an operation cycle conversion unit, and then supplied to a PRML signal processing unit and a level judgement binarization unit.

Abstract translation: 当产生用于数字化来自光盘的重放信号的A / D转换器的采样时钟时，使用由PLL产生的过采样时钟。 此外，通过使用过采样时钟的A / D转换获得的重放数字信号的零交叉位置信息和参考信息被转换为与通道位时钟同步的操作周期转换单元，然后被提供给PRML信号 处理单元和级别判断二值化单元。

公开(公告)号：US06999394B2

公开(公告)日：2006-02-14

申请号：US10196381

申请日：2002-07-17

Applicant: Kouichi Urita ,  Youichi Ogura ,  Shinichiro Sato

Inventor： Kouichi Urita ,  Youichi Ogura ,  Shinichiro Sato

IPC: G11B7/00

CPC classification number: G11B20/10425 ,  G11B7/005 ,  G11B7/00718 ,  G11B20/10009 ,  G11B20/10046 ,  G11B20/18

Abstract: An optical disc playback apparatus that performs appropriate waveform equalization according to a difference in characteristics of reproduced signals between land parts and groove parts in an optical disc to which high-density recording is performed using a land/groove recording method. The optical disc playback apparatus includes a reproduction device, an A/D conversion circuit for sampling a reproduced signal to be converted into a multi-bit digital signal, a filter for subjecting the multi-bit digital signal to digital equalization, a filter coefficient learning device for adaptively controlling filter coefficients for the filter corresponding to the land part and the groove part to minimize an equalization error, and a switch signal generation device for generating a signal for switching between land and groove, thereby changing the filter coefficient adaptively to the land or the groove.

Abstract translation: 一种光盘播放装置，其根据在使用陆/沟记录方法进行高密度记录的光盘中的陆部和凹槽部分之间的再现信号的特性差异执行适当的波形均衡。 光盘播放装置包括再现装置，用于对要转换成多位数字信号的再现信号进行采样的A / D转换电路，用于对多位数字信号进行数字均衡的滤波器，滤波器系数学习 用于自适应地控制对应于岸台部分和槽部分的滤波器的滤波器系数以最小化均衡误差的装置，以及用于产生用于在陆地和凹槽之间切换的信号的开关信号产生装置，从而自适应地改变滤波器系数 或凹槽。

公开(公告)号：US06542039B1

公开(公告)日：2003-04-01

申请号：US09701464

申请日：2001-02-05

Applicant: Youichi Ogura

Inventor： Youichi Ogura

IPC: H03L7085

CPC classification number: G11B20/10037 ,  G11B20/10009 ,  G11B20/1403 ,  H03L7/087 ,  H03L7/091 ,  H03L7/113

Abstract: The present invention provides a phase-locked loop apparatus which extends a capture range in clock reproduction when digital data is reproduced and performs a high-speed and stable phase locking. A phase error is detected by a phase error detector 6 from a signal obtained by the sampling. Further, a frequency error is detected by a frequency error detector 8 on the basis of an inclination of a phase curve obtained by phase error information. A phase-locked loop circuit is controlled on the basis of these obtained phase error and frequency error.

Abstract translation: 本发明提供了一种锁相环装置，其在数字数据被再现时延长了时钟再现中的捕获范围，并执行了高速和稳定的锁相。相位误差由相位误差检测器6根据由 抽样。 此外，频率误差检测器8基于由相位误差信息获得的相位曲线的倾斜度来检测频率误差。 基于这些获得的相位误差和频率误差来控制锁相环电路。

公开(公告)号：US06385239B1

公开(公告)日：2002-05-07

申请号：US09647428

申请日：2000-11-15

Applicant: Toshinori Okamoto ,  Youichi Ogura

Inventor： Toshinori Okamoto ,  Youichi Ogura

IPC: H03H730

CPC classification number: H04L25/497 ,  G11B20/10009 ,  H04L25/03038 ,  H04L2025/03369 ,  H04L2025/03477

Abstract: High-order partial response equalization is performed so that the equalization error of an input signal having non-linear distortions is minimized, thereby improving the characteristics of a reproduced signal. An input signal is subjected to high-order partial response equalization adapted to a non-linear distortion waveform by using a transversal filter 3; a provisional equalization target value is estimated by a provisional decision circuit 4; an error between the provisionally decided value and the input signal is detected by an error detection circuit 5; an error between the provisionally decided value and the output signal from an A/D converter 1 is detected by an input distortion detection circuit 7; the error outputted from the error detection circuit 5 is monitored by an output distortion detection circuit 6; the equalization target value is controlled by an equalization target control means 8 so that the equalization error is minimized; and tap coefficients are controlled by a tap coefficient control means 10.

Abstract translation: 执行高阶部分响应均衡，使得具有非线性失真的输入信号的均衡误差最小化，从而改善再现信号的特性。 通过使用横向滤波器3对输入信号进行适应于非线性失真波形的高阶部分响应均衡; 临时均衡目标值由临时判定电路4估计; 由误差检测电路5检测临时确定值与输入信号之间的误差; 由输入失真检测电路7检测来自A / D转换器1的临时确定值与输出信号之间的误差; 由误差检测电路5输出的误差由输出失真检测电路6监视; 均衡目标值由均衡目标控制装置8控制，使均衡误差最小化; 并且抽头系数由抽头系数控制装置10控制。