公开(公告)号：US4543531A

公开(公告)日：1985-09-24

申请号：US552118

申请日：1983-11-16

申请人： Junkichi Sugita ,  Hiroaki Yada

发明人： Junkichi Sugita ,  Hiroaki Yada

IPC分类号： G11B20/10 ,  H04L7/02 ,  H04L7/033 ,  H03D3/18

CPC分类号： G11B20/10 ,  G11B20/10009 ,  G11B20/10527 ,  H04L7/0334

摘要： A digital data detecting apparatus comprises means for sampling an input digital signal at a frequency which is M times (M>1) higher than a channel bit rate, means responsive to two adjacent sampled values for computing an interval from a point where the digital signal intersects a reference level to a sampling time, and means responsive to an output from the computing means for generating a data detecting signal for detecting data of the digital signal.

摘要翻译： 数字数据检测装置包括用于以高于信道比特率M倍（M> 1）的频率对输入数字信号进行采样的装置，响应于两个相邻采样值，用于计算从数字信号 将参考电平与采样时间相交，并且响应于来自计算装置的输出，用于产生用于检测数字信号的数据的数据检测信号。

公开(公告)号：US07433145B2

公开(公告)日：2008-10-07

申请号：US10732522

申请日：2003-12-11

申请人： Hiroaki Yada ,  Keitaro Yamashita

发明人： Hiroaki Yada ,  Keitaro Yamashita

IPC分类号： G11B19/02

CPC分类号： G11B5/127 ,  G11B5/5526

摘要： Disclosed herein is a magnetic disk apparatus such as a hard disk apparatus or a removable hard disk apparatus which allows switching of the speed of rotation of a magnetic disk while assuring a sufficient tracking control characteristic and a sufficient capacity. More concretely, a magnetic disk apparatus of the present invention, in which tracking of a magnetic head is controlled with reference to a plurality of servo areas formed at predetermined angular distances on a magnetic disk to access the magnetic disk, includes; the servo areas being formed in synchronism with a fixed clock signal such that reference patterns for tracking control are formed therein, a clock generation means for generating a clock signal common to the plurality of servo areas with reference to reproduction signals obtained from the servo areas, a tracking control signal generation means for generating a control signal for tracking control from the reference patterns with reference to the clock signal, a tracking control means for controlling tracking of said magnetic head with reference to the control signal, and a speed switching means for switching the speed of rotation of the magnetic disk.

摘要翻译： 这里公开了一种磁盘装置，例如硬盘装置或可移动硬盘装置，其允许切换磁盘的旋转速度，同时确保足够的跟踪控制特性和足够的容量。 更具体地，本发明的磁盘装置，其中参照在磁盘上以预定角度距离形成的多个伺服区域来控制磁头的跟踪以访问磁盘，包括： 伺服区域与固定的时钟信号同步形成，使得在其中形成用于跟踪控制的参考模式;时钟产生装置，用于参考从伺服区域获得的再现信号产生多个伺服区域共用的时钟信号， 跟踪控制信号产生装置，用于根据时钟信号产生用于从参考图形跟踪控制的控制信号;跟踪控制装置，用于参照控制信号控制所述磁头的跟踪;以及速度切换装置，用于切换 磁盘的旋转速度。

公开(公告)号：US06697958B1

公开(公告)日：2004-02-24

申请号：US09471789

申请日：1999-12-23

申请人： Hiroaki Yada ,  Hiroshi Kanno

发明人： Hiroaki Yada ,  Hiroshi Kanno

IPC分类号： G06F1100

CPC分类号： G11B20/18 ,  G11B19/04 ,  G11B2020/10916

摘要： A disk drive for recording information on and reproducing information from a hard disk drive. The CPU of a host device controls the maximum allowable number of retries, or the maximum period of time allowed for retries, performed by the disk drive when an error occurs in a seek, record, or reproduce operation.

摘要翻译： 用于在硬盘驱动器上记录和再现信息的磁盘驱动器。 主机设备的CPU控制在寻道，记录或再现操作中发生错误时由磁盘驱动器执行的最大允许重试次数或重试允许的最长时间。

公开(公告)号：US5815333A

公开(公告)日：1998-09-29

申请号：US579551

申请日：1995-12-27

申请人： Noriyuki Yamamoto ,  Hiroaki Yada

发明人： Noriyuki Yamamoto ,  Hiroaki Yada

IPC分类号： G11B5/09 ,  G11B5/012 ,  G11B5/55 ,  G11B5/596 ,  G11B5/82 ,  G11B20/12 ,  G11B21/10 ,  G11B19/04

CPC分类号： G11B5/012 ,  G11B5/5526 ,  G11B5/82 ,  G11B5/59644 ,  G11B5/59655

摘要： A magnetic disc having a ROM area and a RAM area which are separated. The ROM only plane and the RAM only plane are separated on the magnetic disc.

摘要翻译： 具有分离的ROM区域和RAM区域的磁盘。 仅ROM平面和仅RAM平面在磁盘上分离。

公开(公告)号：US4701815A

公开(公告)日：1987-10-20

申请号：US836714

申请日：1986-03-06

申请人： Hiroaki Yada ,  Shigeyoshi Imakoshi ,  Hideo Suyama ,  Tetsuo Sekiya ,  Masayuki Nakayama

发明人： Hiroaki Yada ,  Shigeyoshi Imakoshi ,  Hideo Suyama ,  Tetsuo Sekiya ,  Masayuki Nakayama

IPC分类号： G11B5/596

CPC分类号： G11B5/59655

摘要： A servo system for positioning a data transducer head relative to a plurality of substantially concentric data tracks on the surface of a magnetic disc including a pair of servo transducer heads for sensing the data tracks and generating output signals representative of a data signal written on the sensed track, a distance between the pair of servo transducer heads being related to the dimension of the data track and a distance between the servo transducer heads and the data transducer head being related to a data track pitch, a signal processing circuit connected to the pair of servo transducer heads for generating a data transducer head positioning signal and a positioning device for positioning the data transducer head in response to the transducer positioning signal and for maintaining the track centerline alignment of the data transducer head.

摘要翻译： 一种伺服系统，用于相对于包括一对伺服换能器头的磁盘表面上的多个基本上同心的数据磁道定位数据传感器头，用于感测数据磁道并产生表示写入感测到的数据信号的数据信号的输出信号 一对伺服传感器头之间的距离与数据轨道的尺寸相关，并且伺服换能器头与数据传感器头之间的距离与数据轨道间距相关，信号处理电路连接到一对 用于产生数据传感器头定位信号的伺服换能器头和用于响应于换能器定位信号定位数据换能器头并用于维持数据换能器头的轨道中心线对准的定位装置。

公开(公告)号：US6091562A

公开(公告)日：2000-07-18

申请号：US475062

申请日：1995-06-07

申请人： Takamichi Yamakoshi ,  Yoshiharu Shimano ,  Hiroaki Yada

发明人： Takamichi Yamakoshi ,  Yoshiharu Shimano ,  Hiroaki Yada

IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/09 ,  G11B20/10 ,  G11B20/22 ,  G11B5/03

CPC分类号： G11B5/012 ,  G11B20/10009 ,  G11B5/09 ,  G11B2005/0018

摘要： A digital magnetic reproducing apparatus comprises a reproducing head to reproduce data from a magnetic recording medium; an equalizer for shaping, by a partial response method, the waveform of the reproduced signal outputted from the reproducing head; and a decoder for decoding, by a maximum likelihood decoding method, the equalized reproduced signal obtained from the equalizer. The reproducing head employed in this apparatus is an MR (magnetoresistance effect) head which is capable of reducing the second harmonic distortion of the reproduced signal to be -25 dB or lower. Therefore the deterioration of the bit error rate that may result from the nonlinear distortion of the MR head can be further lowered within a sufficiently suppressed range in practical use.

摘要翻译： 数字磁再现装置包括：再现头，用于从磁记录介质再现数据; 均衡器，用于通过部分响应方法来形成从再现头输出的再现信号的波形; 以及解码器，用于通过最大似然解码方法对从均衡器获得的均衡的再现信号进行解码。 在该装置中使用的再现头是能够将再现信号的二次谐波失真降低到-25dB或更低的MR（磁阻效应）头。 因此，在实际使用中，可以在充分抑制的范围内进一步降低由MR磁头的非线性失真引起的误码率的劣化。

公开(公告)号：US5481568A

公开(公告)日：1996-01-02

申请号：US361451

申请日：1994-12-21

申请人： Hiroaki Yada

发明人： Hiroaki Yada

IPC分类号： G11B20/10 ,  G11B20/14 ,  H03K5/08 ,  H03L7/091 ,  H03M13/00 ,  H03M13/33 ,  H04L7/02 ,  H04L25/06 ,  H04L27/00 ,  H03D1/00

CPC分类号： G11B20/10009 ,  G11B20/10037 ,  G11B20/10055 ,  H04L25/068 ,  H04L7/0029 ,  H04L7/0334

摘要： A data detecting apparatus for detecting desired data from a digital signal comprising a first sampling circuit for sampling the digital signal to output samples, an interpolating circuit for interpolating signal values between the samples outputted from the first sampling circuit, and a second sampling circuit for extracting those signal values interpolated by the interpolating circuit which match a phase of a point at which the desired data exists. This constitution allows to implement all blocks making up the data detecting apparatus with digital signal processing circuits synchronously operating on the a clock, detecting the reproduced signal data without being affected by jitters contained in reproduced signals coming from a channel. The constitution also makes it possible to form on a single LSI chip such circuits including the data detecting apparatus, an ECC decoder, a controller, and an interface circuit as conventionally formed on discrete chips. This permits a compact implementation of an entire apparatus and reduces its production cost. Further, this constitution facilitates the design and test for implementing the embodiment on large scale integrations and eliminates the necessity for externally attached analog parts, making the implementation free of adjustment and less susceptible to aging.

摘要翻译： 一种用于从数字信号中检测所需数据的数据检测装置，包括用于对数字信号进行采样以输出样本的第一采样电路，用于内插从第一采样电路输出的采样之间的信号值的内插电路和用于提取的第二采样电路 通过内插电路内插的与所需数据存在的点的相位匹配的那些信号值。 这种结构允许利用在时钟上同步工作的数字信号处理电路来实现构成数据检测装置的所有块，检测再现的信号数据而不受来自信道的再现信号中包含的抖动的影响。 该结构还使得可以在单个LSI芯片上形成包括数据检测装置，ECC解码器，控制器和如在离散芯片上传统地形成的接口电路的电路。 这允许整个设备的紧凑实现并且降低其生产成本。 此外，该结构有助于实现大规模集成的实施例的设计和测试，并且消除了对外部连接的模拟部件的需要，使得实现不受调节并且不易老化。

公开(公告)号：US4729048A

公开(公告)日：1988-03-01

申请号：US837810

申请日：1986-03-10

申请人： Shigeyoshi Imakoshi ,  Hideo Suyama ,  Hiroaki Yada ,  Toru Katakura ,  Tetsuo Sekiya ,  Masayuki Nakayama

发明人： Shigeyoshi Imakoshi ,  Hideo Suyama ,  Hiroaki Yada ,  Toru Katakura ,  Tetsuo Sekiya ,  Masayuki Nakayama

IPC分类号： G11B5/012 ,  G11B5/48 ,  G11B5/55 ,  G11B5/596

CPC分类号： G11B5/012 ,  G11B5/4886 ,  G11B5/5534 ,  G11B5/59633

摘要： A combination magnetic transducer head apparatus which can easily achieve initial formatting of data tracks of a rotating magnetic recording medium such as a hard disk without using a specific separate initial formatting system. The apparatus comprises a magnetic head for initial formatting, another magnetic head for servo control and a magnetic recording and playback head all mounted on a head slider. In the apparatus, at least one track is first recorded on a magnetic disk by the magnetic head for initial formatting and then another track is recorded by the magnetic recording and playback head while the first track is scanned by the magnetic head for servo control whereafter such a series of operations are repeated until completion of recording of all tracks required.

摘要翻译： 一种组合磁换能器头装置，其可以容易地实现诸如硬盘的旋转磁记录介质的数据轨迹的初始格式化，而不使用特定的单独的初始格式化系统。 该装置包括用于初始格式化的磁头，用于伺服控制的另一个磁头和全部安装在磁头滑块上的磁记录和重放头。 在该设备中，首先通过磁头将至少一个磁道记录在磁盘上用于初始格式化，然后由磁记录和重放磁头记录另一个磁道，同时第一磁道由用于伺服控制的磁头扫描， 重复一系列操作，直到完成所需的所有轨迹的记录。

公开(公告)号：US06999389B2

公开(公告)日：2006-02-14

申请号：US10338383

申请日：2003-01-08

申请人： Hiroaki Yada ,  Hiroshi Kanno

发明人： Hiroaki Yada ,  Hiroshi Kanno

IPC分类号： G11B5/09

CPC分类号： G11B20/1879 ,  G11B2020/10944 ,  G11B2020/183 ,  H04N5/781 ,  H04N9/8042 ,  H04N9/8227

摘要： A disk recording/reproduction device ideal for processing audio-visual data streams requiring real-time characteristics. A disk device has an operating mode ideal for recording and reproduction of motion image and audio data requiring real-time continuity by limiting the time needed for error processing, and the host incorporating the disk device can easily monitor the real-time continuity. The host can specify the urgency of individual recording and reproduction instructions to the disk so that control of real-time continuity can be actively implemented in better detail. A means for assigning a total number to a plurality of simultaneously recorded or reproduced data streams as well assigning individual data stream numbers allows informing the disk device of the throughput required by the host.

公开(公告)号：US20050008341A1

公开(公告)日：2005-01-13

申请号：US10732522

申请日：2003-12-11

申请人： Hiroaki Yada ,  Keitaro Yamashita

发明人： Hiroaki Yada ,  Keitaro Yamashita

IPC分类号： G11B20/14 ,  G11B5/127 ,  G11B5/55 ,  G11B21/10 ,  H04N7/64

CPC分类号： G11B5/127 ,  G11B5/5526

摘要： Disclosed herein is a magnetic disk apparatus such as a hard disk apparatus or a removable hard disk apparatus which allows switching of the speed of rotation of a magnetic disk while assuring a sufficient tracking control characteristic and a sufficient capacity. More concretely, a magnetic disk apparatus of the present invention, in which tracking of a magnetic head is controlled with reference to a plurality of servo areas formed at predetermined angular distances on a magnetic disk to access the magnetic disk, includes; the servo areas being formed in synchronism with a fixed clock signal such that reference patterns for tracking control are formed therein, a clock generation means for generating a clock signal common to the plurality of servo areas with reference to reproduction signals obtained from the servo areas, a tracking control signal generation means for generating a control signal for tracking control from the reference patterns with reference to the clock signal, a tracking control means for controlling tracking of said magnetic head with reference to the control signal, and a speed switching means for switching the speed of rotation of the magnetic disk.

摘要翻译： 这里公开了一种磁盘装置，例如硬盘装置或可移动硬盘装置，其允许切换磁盘的旋转速度，同时确保足够的跟踪控制特性和足够的容量。 更具体地，本发明的磁盘装置，其中参照在磁盘上以预定角度距离形成的多个伺服区域来控制磁头的跟踪以访问磁盘，包括： 伺服区域与固定的时钟信号同步形成，使得在其中形成用于跟踪控制的参考模式;时钟产生装置，用于参考从伺服区域获得的再现信号产生多个伺服区域共用的时钟信号， 跟踪控制信号产生装置，用于根据时钟信号产生用于从参考图形跟踪控制的控制信号;跟踪控制装置，用于参照控制信号控制所述磁头的跟踪;以及速度切换装置，用于切换 磁盘的旋转速度。