公开(公告)号：WO1990005975A1

公开(公告)日：1990-05-31

申请号：PCT/US1989005120

申请日：1989-11-13

Applicant: BRIER TECHNOLOGY, INC.

Inventor： BRIER TECHNOLOGY, INC. ,  BIZJAK, John ,  HASSEL, Michael ,  NIEMANN, David

IPC: G11B05/09

CPC classification number: G11B20/10009 ,  G11B20/1419

Abstract: At a first frequency (30), flux transitions are achieved which result in large excursions of the information signal. The first frequency approximates the maximum frequency at which such excursions can occur. A second higher frequency (89) is utilized to create small or no excursions. At this second frequency, a complete flux transition is not achieved. Information is represented by the presence or absence of excursions. An adaptive, self-compensating scheme, which is self-adjusting in real time and provides for recovery of the nominal flux transition independent of the information pattern, is utilized. Data recovery is qualified through the use of an excursion detection scheme which compares variations in the tracking peak (91) detect value with the input signal separated by an excursion threshold value. When the input waveform falls below the adaptive threshold voltage (94), a data transition is defined.

Abstract translation: 在第一频率（30），实现了磁通转换，导致信息信号的大偏移。 第一个频率近似于发生这种偏移的最大频率。 使用第二较高频率（89）创建小的或不偏离的偏移。 在该第二频率下，不能实现完全的磁通转换。 信息由有或无缺席表示。 利用自适应自补偿方案，其实时自调节并且提供独立于信息模式的标称通量转换的恢复。 通过使用偏移检测方案来限定数据恢复，其将跟踪峰值（91）检测值的变化与由偏移阈值分隔的输入信号进行比较。 当输入波形低于自适应阈值电压（94）时，定义数据转换。

公开(公告)号：WO1984004622A1

公开(公告)日：1984-11-22

申请号：PCT/JP1984000242

申请日：1984-05-15

Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA ,  IDO, Kihei;

Inventor： MITSUBISHI DENKI KABUSHIKI KAISHA

IPC: G11B05/09

CPC classification number: G11B20/18 ,  G11B20/00007 ,  G11B20/10

Abstract: A digital signal reproducing apparatus is arranged such that a signal to be written is selected by a write track selector unit (200) from a plurality track signals demodulated by a demodulator unit (50). The track signal selected by the track selector unit (200) is stored in a memory unit (102), during this time, the timing for writing the track signal selected by the track selector unit (200) into the memory unit (102) is determined by a write timing setting unit (300). The read timing is determined by a read setting unit (400) so that a signal stored in the memory unit (102) is read out during a period between two write-timing periods set by the write timing setting unit (300), and the signal to be read out is determined. In accordance with output signals from the write timing setting unit (300) and the read setting unit (400), a read/write selector unit (100) selectively designates either a write or read for the memory unit (102), so that a write or read is executed every 1/2 ANfc. This arrangement makes it possible to reduce the circuit size.

Abstract translation: 数字信号再现装置被布置成使得由写入轨道选择器单元（200）从由解调器单元（50）解调的多个轨道信号中选择要写入的信号。 由轨道选择器单元（200）选择的轨道信号被存储在存储单元（102）中，在此期间，将由轨道选择器单元（200）选择的轨道信号写入存储单元（102）的定时是 由写入定时设定单元（300）确定。 读取定时由读取设置单元（400）确定，使得存储在存储单元（102）中的信号在由写入定时设置单元（300）设置的两个写入定时周期期间被读出，并且 确定要读出的信号。 根据来自写入定时设定单元（300）和读取设置单元（400）的输出信号，读取/写入选择器单元（100）有选择地指定存储单元（102）的写入或读取，使得 写入或读取每1/2 ANFc执行一次。 这种布置使得可以减小电路尺寸。

公开(公告)号：WO1982003719A1

公开(公告)日：1982-10-28

申请号：PCT/JP1982000125

申请日：1982-04-16

Applicant: SONY CORP ,  ODAKA KENTARO

Inventor： SONY CORP

IPC: G11B05/09

CPC classification number: G11B20/1809

Abstract: Procede de codage de correction d'erreurs utilisant une imbrication croisee et produisant un premier code redondant avec un additionneur (12) a partir d'un mot PCM (W), imbriquant le code redondant et le mot PCM (W) dans un circuit de memoire (13) et produisant ainsi un deuxieme code redondant avec un additionneur (14), toutes ces etapes ayant lieu dans l'ordre donne, L'imbrication est limitee au relistage du mot dans un bloc d'imbrication predetermine (1), le decodage est complete dans un bloc d'imbrication, et la correction est simplifiee. Le deuxieme code redondant est contenu dans la serie produisant le premier code redondant de maniere a ameliorer la capacite de correction d'erreurs. Lorsque le signal d'information de commande a ete selectionne en tant que valeur initiale du deuxieme code redondant, la zone de transmission, intrinseque au codeur et au decodeur pour l'information de commande peut etre eliminee.

公开(公告)号：WO1982001271A1

公开(公告)日：1982-04-15

申请号：PCT/US1981001201

申请日：1981-09-09

Applicant: SPIN PHYSICS INC

Inventor： SPIN PHYSICS INC ,  LEMKE J

IPC: G11B05/09

CPC classification number: G11B5/00826 ,  G11B20/00007 ,  G11B20/22

Abstract: Qu'il s'agisse d'enregistrer des informations arrivant en parallele ou en serie, le concept general de la presente invention est d'enregistrer des echantillons (ou bites) de donnees sous forme de signaux amortis de sur-oscillations (par exemple de forme sin x/x) et d'obtenir un retard relatif (12, 52B...52n) entre les enregistrements sur des pistes adjacentes de maniere telle que la crete principale d'un signal enregistre tombe a un croisement zero d'un autre, et vice versa. Etant donne que les cretes de deux signaux adjacents ne sont pas presentes-dans le cas, par exemple, d'une bande magnetique a la meme position longitudinale sur la bande, on obtient une isolation entre les signaux enregistres sur la bande. En echantillonnant de maniere convenable les signaux enregistres sur la bande pendant la reproduction, on peut reproduire les signaux originaux.

公开(公告)号：WO1998016920A1

公开(公告)日：1998-04-23

申请号：PCT/US1997019012

申请日：1997-10-10

Applicant: MAXTOR CORPORATION

Inventor： MAXTOR CORPORATION ,  WHALEY, Jeffrey, L. ,  METZ, Robert, L.

IPC: G11B05/09

CPC classification number: G11B20/1252 ,  G11B5/5526 ,  G11B5/596 ,  G11B21/085 ,  G11B27/326

Abstract: Separate servo parameter values are combined into a single servo parameter value having a bit length shorter than the total bit length of the separate parameter values. The combined parameter value is then stored in a servo field (16) on a storage disk (10). By storing the shorter combined parameter, a given amount of servo information can be stored in a smaller space on the disk (10), thereby reducing overhead. In one embodiment, servo parameters are added together to create the combined parameters. In another embodiment, an equation is provided for creating the combined parameters, that results in a relatively large numerical distance between combined parameters in adjacent servo sectors on a track of the storage disk (10). The combined parameters stored on the disk (10) can be used, for example, to check the accuracy of software position estimators in the disk drive.

Abstract translation: 分离的伺服参数值被组合成具有比单独的参数值的总位长度短的位长度的单个伺服参数值。 然后将组合的参数值存储在存储盘（10）上的伺服字段（16）中。 通过存储较短的组合参数，可以将一定量的伺服信息存储在盘（10）上较小的空间中，从而减少开销。 在一个实施例中，将伺服参数相加在一起以产生组合的参数。 在另一个实施例中，提供了用于创建组合参数的等式，其导致存储盘（10）的轨道上的相邻伺服扇区中的组合参数之间的相对较大的数值距离。 例如，可以使用存储在盘（10）上的组合参数来检查磁盘驱动器中的软件位置估计器的精度。

公开(公告)号：WO1997020309A1

公开(公告)日：1997-06-05

申请号：PCT/IB1996001304

申请日：1996-11-27

Applicant: PHILIPS ELECTRONICS N.V. ,  PHILIPS NORDEN AB

Inventor： PHILIPS ELECTRONICS N.V. ,  PHILIPS NORDEN AB ,  CUMPSON, Stephen, Rodney ,  STUPP, Steven, Elliot

IPC: G11B05/09

CPC classification number: G11B5/65 ,  G11B5/00 ,  G11B5/09 ,  G11B5/23 ,  G11B5/74 ,  G11B5/78

Abstract: A combination is disclosed of a magnetic record carrier (1) and an apparatus for recording a digital information signal in a track on said record carrier. The apparatus comprises an input terminal (40) for receiving the digital information signal, an encoding unit (42) for encoding the digital information signal so as to obtain a digital channel signal suitable for recording, and a writing unit (44) for writing the digital channel signal in the track on the record carrier. The writing unit (44) comprises at least one write head (2) having a specific gap width (g). The apparatus is adapted to write the digital channel signal in the record carrier, with a bit-length which is smaller than 0.25 mu m and the record carrier (1) has an oblique easy-axis angle between 30 DEG and 42 DEG with regard to the longitudinal direction of the track and in a plane perpendicular to the record carrier.

Abstract translation: 公开了磁记录载体（1）和用于在所述记录载体上的轨道中记录数字信息信号的装置的组合。 该装置包括用于接收数字信息信号的输入端（40），用于对数字信息信号进行编码以获得适合于记录的数字信道信号的编码单元（42），以及写入单元 数字通道信号在轨道上的记录载体上。 写入单元（44）包括具有特定间隙宽度（g）的至少一个写入头（2）。 该装置适于将数字信道信号写入记录载体中，位长小于0.25μm，记录载体（1）具有30°至42°之间的倾斜易轴角度，关于 轨道的纵向方向和垂直于记录载体的平面。

公开(公告)号：WO1997012362A1

公开(公告)日：1997-04-03

申请号：PCT/US1996015244

申请日：1996-09-17

Applicant: QUANTUM CORPORATION

Inventor： QUANTUM CORPORATION ,  FITZPATRICK, James ,  CHE, Xiaodong

IPC: G11B05/09

CPC classification number: G11B5/012 ,  G11B5/4886 ,  G11B5/59627 ,  G11B5/59683

Abstract: Determining a micro-jog parameter in a disk drive that employs a magneto-resistive (MR) transducer head assembly and a partial response (PRML) detector includes improved accuracy in measuring on-track signal strength by use of a matched filter technique. The matched filter includes circuitry (424) for emulating a partial response signal expected to be produced by a selected test bit pattern prerecorded on the selected track. The matched filtering technique provides improved accuracy in measuring the detected signal strength as it provides an extremely narrow digital filter (428-430, 432) focused on the test bit pattern frequency. Improved determination of the micro-jog distance further includes measuring interference from adjacent tracks, the best error rate being achieved at micro-jog positions intermediate the maximum on-track signal strength and the minimum off-track interference. A novel digital detector for accurately measuring adjacent track interference also is disclosed.

Abstract translation: 确定采用磁阻（MR）传感器头部组件和部分响应（PRML）检测器的磁盘驱动器中的微步进参数包括通过使用匹配滤波器技术来提高测量轨道上信号强度的精度。 匹配滤波器包括用于模拟预期由预先记录在所选轨道上的选定测试位模式产生的部分响应信号的电路（424）。 匹配滤波技术提供了测量检测信号强度的改进精度，因为它提供了一个专注于测试位模式频率的极窄数字滤波器（428-430,432）。 改进的微步距距离的确定还包括测量来自相邻轨道的干扰，在最大导轨信号强度和最小偏离磁道干扰之间的微点位置处实现最佳误码率。 公开了一种用于精确测量相邻轨道干扰的新型数字检测器。

公开(公告)号：WO1995035565A1

公开(公告)日：1995-12-28

申请号：PCT/US1995004502

申请日：1995-04-17

Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY

Inventor： MINNESOTA MINING AND MANUFACTURING COMPANY ,  FAYLING, Richard, E.

IPC: G11B05/09

CPC classification number: G11B20/10194 ,  G11B5/09

Abstract: In NRZ binary magnetic recording, each current reversal has a waveform edge that is steep while approaching and passing through zero (I0) but is made substantially less steep after passing a threshold level (It). This is accomplished by repeatedly incrementally delaying the increase in absolute magnitude of write current within the range of It and Imax. Doing so affords jagged trailing f-t-e profiles that separate adjacent flux transitions recorded on the magnetic recording medium. Because those jagged profiles are straighter than curved profiles of the prior art, the noise or intersymbol interference produced in adjacent bit cells upon read-out can be reduced, thus permitting increased linear bit densities.

Abstract translation: 在NRZ二进制磁记录中，每个电流反转具有在接近并通过零（I0）时是陡峭的波形边缘，但是在通过阈值电平（It）之后基本上不太陡峭。 这是通过重复地递增地延迟写入电流在It和Imax的范围内的绝对量的增加而实现的。 这样做会产生锯齿状的尾随f-t剖面，分离记录在磁记录介质上的相邻磁通转变。 由于这些锯齿状轮廓比现有技术的弯曲轮廓更直，所以可以减少在读出时在相邻位单元中产生的噪声或符号间干扰，从而允许增加的线性比特密度。

公开(公告)号：WO1995022820A1

公开(公告)日：1995-08-24

申请号：PCT/IB1995000077

申请日：1995-02-03

Applicant: PHILIPS ELECTRONICS N.V. ,  PHILIPS NORDEN AB

Inventor： PHILIPS ELECTRONICS N.V. ,  PHILIPS NORDEN AB ,  JOHNSON, Mark, Thomas ,  DEN BROEDER, Friedrich, Johannes, Ary ,  SMITS, Jelto, Wybe

IPC: G11B05/09

CPC classification number: B82Y25/00 ,  G11B5/00 ,  G11B5/127 ,  G11B5/245 ,  G11B5/31 ,  G11B5/3903 ,  G11B5/465 ,  G11B2005/0008 ,  G11C11/15 ,  H01F10/3254

Abstract: A device and method for controllably locally altering the magnetization direction in a body of magnetic material, whereby a layer of non-metallic material is disposed on a surface of the body, onwhich layer is provided a body of magnetic material having a fixed magnetization direction, whereby both bodies of magnetic material are magnetically coupled across the interposed non-metallic layer, the nature of this magnetic coupling being locally alterable by means of locally subjecting the layer of non-metallic material to a controllable electric field.

Abstract translation: 一种用于可控地局部地改变磁性材料体中的磁化方向的装置和方法，其中非金属材料层设置在主体的表面上，在该表面上设置有具有固定的磁化方向的磁性材料体， 由此两个磁性材料体都跨越插入的非金属层磁耦合，通过将非金属材料层局部地施加到可控电场，该磁耦合的性质可以局部地改变。

公开(公告)号：WO1995015551A1

公开(公告)日：1995-06-08

申请号：PCT/GB1994002664

申请日：1994-12-05

Applicant: HEWLETT-PACKARD LIMITED ,  HEWLETT-PACKARD COMPANY ,  HARDWICK, John, Patrick ,  WILLIAMS, Christopher, Huw

Inventor： HEWLETT-PACKARD LIMITED ,  HEWLETT-PACKARD COMPANY

IPC: G11B05/09

CPC classification number: G11B5/09 ,  G11B5/00878 ,  G11B5/00891 ,  G11B20/10009

Abstract: A Digital Data Storage (DDS) data storage mechanism for reading DDS tapes containing data at either 61 kbpi or 122 kbpi has two circuits for recovering data from signals induced in a magnetic head by magnetic patterns on the tape. One circuit (90) incorporates a clipping amplifier (92), a phase-locked loop (PLL) (94), and a latch (96) to sample the two-level signal obtained at 61 kbpi, at times defined by clock pulses from the PLL. The second circuit (100) incorporates a PR-1 partial-response maximum-likelihood (PRML) detector (110) to decode the three-level signal obtained at 122 kbpi. The cosine frequency response characteristic of the PR-1 channel facilitates use of the same rotary head drum and magnetic head gap for reading tapes at either bit density.

Abstract translation: 用于读取包含61kbpi或122kbpi数据的DDS磁带的数字数据存储（DDS）数据存储机制具有两个电路，用于通过磁带上的磁性图案从磁头中感应的信号中恢复数据。 一个电路（90）包括限幅放大器（92），锁相环（PLL）（94）和锁存器（96），以对由61kbpi获得的两电平信号进行采样，时间由 PLL。 第二电路（100）包含PR-1部分响应最大似然（PRML）检测器（110），以解码以122kbpi获得的三电平信号。 PR-1通道的余弦频率响应特性有助于使用相同的旋转磁头鼓和磁头间隙，以便以任一位密度读取磁带。