公开(公告)号：WO1984003166A1

公开(公告)日：1984-08-16

申请号：PCT/FR1984000029

申请日：1984-02-09

Applicant: SOCIETE INTERNATIONALE DE SERVICE A L'EXPORTATION ,  SPECIALITES ELECTRO PHYSIQUES SEP ,  RECHERCHES INTEGREES AU MARKETING RIM ,  PICARD, Jacques, Pierre ,  DAGUILLON, Claude, Alain

Inventor： SOCIETE INTERNATIONALE DE SERVICE A L'EXPORTATION ,  SPECIALITES ELECTRO PHYSIQUES SEP ,  RECHERCHES INTEGREES AU MARKETING RIM

IPC: G11B05/02

CPC classification number: G11B20/00688 ,  G06F2211/007 ,  G11B20/00086 ,  G11B20/00695 ,  H04N5/913 ,  H04N2005/91321

Abstract: Device for the protection of a video tape on the "sound" track of which have been recorded coded messages, comprising a detector (9) for detecting said coded messages, means (7, 8) for inhibiting or enabling the reading or copying of the tape at each detection of a coded message corresponding to a preset program and means (analog delay lines) (3, 5) for transmitting the sound signal while eliminating the coded message.

公开(公告)号：WO1998037548A1

公开(公告)日：1998-08-27

申请号：PCT/JP1997000493

申请日：1997-02-21

Applicant: HITACHI, LTD. ,  ITO, Kenya ,  FUTAMOTO, Masaaki ,  HIRAYAMA, Yoshiyuki ,  HONDA, Yukio ,  INABA, Nobuyuki ,  YAMANAKA, Kazusuke

Inventor： HITACHI, LTD.

IPC: G11B05/02

CPC classification number: G11B25/043 ,  G11B5/00 ,  G11B5/012 ,  G11B5/035 ,  G11B33/144 ,  G11B33/1453 ,  G11B33/1486 ,  G11B2005/0018

Abstract: In order to record and reproduce data satisfactorily and maintain the reliability of a magnetic recording/reproducing apparatus regardless of the change of various conditions including temperature, pressure and humidity, a timer (1), an automatic recording/reproducing controller (2) and a reproducing sensing current controller (3) are added to a conventional magnetic recording/reproducing apparatus and both the recording current value and the reproducing sensing current value are controlled interlockingly with each other to optimize them automatically and periodically. With this constitution, even if the characteristics of the head and the medium change with the change of various conditions including temperature, pressure and humidity, a necessary reproducing output can be detected and the reliability of the magnetic recording/reproducing apparatus can be maintained.

Abstract translation: 为了令人满意地记录和再现数据并且保持磁记录/再现装置的可靠性，而不管包括温度，压力和湿度的各种条件的变化，定时器（1），自动记录/再现控制器（2）和 再现感测电流控制器（3）被添加到传统的磁记录/再现装置中，并且记录电流值和再现感测电流值彼此互锁地控制，并且自动和周期性地优化它们。 利用这种结构，即使头和介质的特性随着包括温度，压力和湿度在内的各种条件的变化而改变，可以检测必要的再现输出，并且可以保持磁记录/再现装置的可靠性。

公开(公告)号：WO1997017696A1

公开(公告)日：1997-05-15

申请号：PCT/US1996018094

申请日：1996-11-08

Applicant: PHASE METRICS

Inventor： PHASE METRICS ,  INBAR, Michael

IPC: G11B05/02

CPC classification number: H03D1/2281 ,  G01R33/1207 ,  G11B5/012 ,  G11B20/1816 ,  G11B27/36 ,  G11B33/10

Abstract: An apparatus and method for demodulating an amplitude modulated read signal generated by a magnetic head (12) of a hard disk drive. The apparatus includes a pair of serially connected track and hold circuits (16, 20) that receive the read signal. The track or hold state of each circuit is controlled by a phase lock loop circuit (24) which also receives the read signal. The first track and hold circuit initially tracks the read signal to a peak value. The second track and hold circuit tracks the output of the first circuit. The output signals are compared to a threshold value to detect bit errors in the signal. The constant output signals provide additional energy to the detection circuit to minimize the number of false error signals from the comparator circuit (32).

Abstract translation: 一种用于解调由硬盘驱动器的磁头（12）产生的调幅读信号的装置和方法。 该装置包括一对串行连接的跟踪和保持电路（16,20），其接收读取信号。 每个电路的跟踪或保持状态由也接收读取信号的锁相环电路（24）控制。 第一个跟踪和保持电路首先将读取的信号跟踪到一个峰值。 第二轨道和保持电路跟踪第一电路的输出。 将输出信号与阈值进行比较，以检测信号中的位错误。 恒定输出信号为检测电路提供额外的能量以最小化来自比较器电路（32）的误差信号的数量。

公开(公告)号：WO1995035563A2

公开(公告)日：1995-12-28

申请号：PCT/IB1995000431

申请日：1995-06-06

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

Inventor： PHILIPS ELECTRONICS N.V. ,  PHILIPS NORDEN AB ,  VOORMAN, Johannes, Otto ,  POTHAST, Hendrik, Jan ,  WONG-LAM, Ho, Wai

IPC: G11B05/02

CPC classification number: G11B5/09 ,  G11B5/02 ,  G11B19/04 ,  H03F3/45085 ,  H03F3/72

Abstract: A write amplifier (4) comprising four current mirrors (14, 22, 30 and 38) which are turned on two at a time by two switchable floating current sources (46, 48) between the input terminals (16, 40; 24, 32) of the current mirrors in order to produce a write current of alternating polarity through the write head (2). The parasitic capacitances across the write head (2) and/or the parasitic capacitances of the write amplifier (4) at the write terminals (6, 8) are neutralised by means of neutralising capacitors (142, 144, 146, 148). The high impedance at the terminals (6, 8) of the write head (2) enables the common-mode voltage across the write head (2) to be fixed at any desired voltage value by means of a common-mode circuit.

Abstract translation: 一种写入放大器（4），包括四个电流镜（14,22,30和38），它们通过两个可切换的浮动电流源（46,48）在输入端（16,40; 24,32） ），以通过写入头（2）产生交替极性的写入电流。 写入端子（6,8）上的写入头（2）和/或写入放大器（4）的寄生电容之间的寄生电容通过中和电容器（142,144,146,148）中和。 写头（2）的端子（6,8）处的高阻抗使写入头（2）两端的共模电压能够通过共模电路固定在任何所需的电压值。

公开(公告)号：WO1991013433A1

公开(公告)日：1991-09-05

申请号：PCT/US1991001243

申请日：1991-02-25

Applicant: BEHR, Michael, I. ,  BUMB, Frank, C., Jr.

IPC: G11B05/02

CPC classification number: G11B5/5965 ,  G11B5/5543 ,  G11B5/58 ,  G11B5/584

Abstract: A track means (10) defined by magnetic recording media (11) on a substrate (12), the media along the track means having two levels, one for recording of data (17), and the other for recording of servo information (16), wherein recorded magnetic transitions at the second level define the servo information, the transitions arrayed along the track means as groups of converging lines (24, 28) which extend in crosswise or spanwise relation to multiple tracks. The data is recorded without any wasted magnetic space between tracks (zero guardband) using alternating angles (azimuthal) of magnetic orientation so that they do not interfere with each other when read. The read head cores or gaps (41-44) may be "oriented" to read recorded data transitions extending at different angles relative to track length direction.

Abstract translation: 由基板（12）上的磁记录介质（11）限定的轨道装置（10），沿着轨道装置的介质具有两个级别，一个用于记录数据（17），另一个用于记录伺服信息 ），其中在所述第二级别的记录磁转变定义所述伺服信息，所述转移沿轨道装置排列成会聚线组（24,28），其以横向或横向关系延伸到多个轨道。 使用磁性定向的交替角度（方位角），记录数据，轨道之间没有任何浪费的磁空间（零保护带），使得它们在读取时不会彼此干扰。 读取磁头核心或间隙（41-44）可以“定向”以读取相对于磁道长度方向以不同角度延伸的记录数据转变。

公开(公告)号：WO1986006534A1

公开(公告)日：1986-11-06

申请号：PCT/JP1986000216

申请日：1986-04-28

Applicant: SONY CORPORATION ,  NAITO, Takashi ,  TOSAKA, Susumu

Inventor： SONY CORPORATION

IPC: G11B05/02

CPC classification number: G11B11/1056

Abstract: A permanent magnet (15) is used as a means for producing an external magnetic field, and a coil (25) is provided so as to surround this permanent magnet (15). This permanent magnet (15) can be turned 180o in a desired direction by a turning force applied thereto and generated by a repellent force due to an external magnetic field Hm produced by the permanent magnet (15) and a magnetic field Hc produced when an electric current is made to flow through the coil (25). This will make it possible to obtain an external magnetic field reversing apparatus of a low cost, a high reliability and small dimensions.

公开(公告)号：WO1984003579A1

公开(公告)日：1984-09-13

申请号：PCT/US1984000320

申请日：1984-03-02

Applicant: BURROUGHS CORPORATION

Inventor： BURROUGHS CORPORATION ,  BADER, Clifford, J.

IPC: G11B05/02

CPC classification number: G11B20/24 ,  G11B5/027 ,  G11B20/06

Abstract: An electronic system for use with low cost audio tape recorders (30) whereby a substantially noise-free wide dynamic range is provided for the recording of analog signals in the DC to 30 HZ frequency band. In achieving this result, the system utilizes two FM carrier oscillators (10 and 20) having center frequencies displaced from each other and modulated respectively in opposite senses by the signal being recorded. The system also provides an additional utility channel (E2) of limited dynamic range for the concurrent recording of time markers, digital signals and the like.

Abstract translation: 一种用于低成本音频磁带录音机（30）的电子系统，由此为DC-30HZ频带中的模拟信号的记录提供了基本上无噪声的宽动态范围。 在实现该结果的同时，该系统利用两个具有相互偏移的中心频率的FM载波振荡器（10和20），并通过被记录的信号分别以相反的方式进行调制。 该系统还提供用于同时记录时间标记，数字信号等的有限动态范围的附加效用信道（E2）。

公开(公告)号：WO1998016918A1

公开(公告)日：1998-04-23

申请号：PCT/US1997018810

申请日：1997-10-09

Applicant: QUANTUM CORPORATION

Inventor： QUANTUM CORPORATION ,  SCARAMUZZO, John ,  SAWIN, James ,  BUCH, Bruce, D. ,  BROWN, Russel, W. ,  HORGAN, Nick

IPC: G11B05/02

CPC classification number: G11B19/04 ,  G11B5/012 ,  G11B5/09 ,  G11B20/10009 ,  G11B20/1258 ,  G11B20/1816 ,  G11B20/1866 ,  G11B20/24 ,  G11B2005/0016 ,  G11B2020/1476 ,  G11B2020/183

Abstract: A method and implementing apparatus for recovering data from a rotating data storage disk (10) in the presence of thermal asperities (TA) induced in a magnetoresistive transducer (18) comprises: electrically detecting a thermal asperity (TA) in a disk drive read channel (110), correlating the detected thermal asperity (TA) to a known format of the track (12), selecting at least one of a plurality of thermal asperity data recovery modes based upon the location of the thermal asperity (TA) in the formatted track (12) and applying the selected at least one of the plurality of available thermal asperity recovery modes to recover data otherwise rendered unavailable by the thermal asperity (TA).

Abstract translation: 一种用于在存在在磁阻换能器（18）中感应的热凹凸（TA）的情况下从旋转数据存储盘（10）中恢复数据的方法和实现装置包括：电磁检测磁盘驱动器读通道中的热不平坦度（TA） （110），将所检测到的热不均匀性（TA）与所述轨道（12）的已知格式相关联，基于所格式化的所述热凹凸（TA）的位置来选择多个热凹凸数据恢复模式中的至少一个 轨道（12）并且应用所选择的多个可用热凹凸恢复模式中的所选择的至少一个以恢复否则由热不均匀（TA）不可用的数据。

公开(公告)号：WO1997011457A1

公开(公告)日：1997-03-27

申请号：PCT/JP1995001881

申请日：1995-09-20

Applicant: HITACHI, LTD. ,  ISHIKAWA, Akira ,  TANAHASHI, Kiwamu ,  FUTAMOTO, Masaaki

Inventor： HITACHI, LTD.

IPC: G11B05/02

CPC classification number: G11B5/653 ,  G11B5/02 ,  G11B5/31

Abstract: A magnetic recording medium is used for a recording device which is capable of reliable high-density recording and reproducing of data. The magnetic recording medium has a magnetic layer of an oxide that contains iron and barium, the atomic composition ratio of iron and barium being 2

Abstract translation: 磁记录介质用于能够可靠地高密度地记录和再现数据的记录装置。 磁记录介质具有含有铁和钡的氧化物的磁性层，铁和钡的原子组成比为2≤Fe/ Ba 8。磁记录介质具有3kOe的矫顽力或 在磁头相对于磁记录介质运行的方向上较大。 这种结构使得可以获得高S / N和低误码率，并且因此在大于3吉比特每平方英寸的高记录密度下实现长于15万小时的故障之间的平均时间。

公开(公告)号：WO1997009714A1

公开(公告)日：1997-03-13

申请号：PCT/US1995017028

申请日：1995-12-28

Applicant: SEAGATE TECHNOLOGY, INC. ,  FLINSBAUGH, Jack, W.

Inventor： SEAGATE TECHNOLOGY, INC.

IPC: G11B05/02

CPC classification number: B82Y25/00 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/035 ,  G11B15/026 ,  G11B2005/0018 ,  G11B2005/3996

Abstract: Apparatus and method for dynamically programming the magnitude of read bias and write currents in a disc drive head (30A, 30B). A digital input value is provided to a register (80) of a digital to analog converter (76, 78), the digital input value indicative of the desired magnitude of the head current. A multiplier (82) of the digital to analog converter (76, 78) multiplies the digital input value by a reference voltage to generate an output voltage. The differential voltage between the reference voltage and the output voltage controls the source to drain resistance of a transistor (106) connected in series with a preamp voltage source (114, 120) of a preamp circuit (70). By inputting different digital input values, the source to drain resistance of the transistor (106) connected in series with a preamp voltage source (114, 120) of a preamp circuit (70). By inputting different digital input values, the source to drain resistance of the transistor (106), and hence the magnitude of the current generated by the preamp voltage source (114, 120), are precisely controlled. The magnitude of the head current is provided as a multiple of the magnitude of the current generated by the preamp voltage source (114, 120). During a read operation, the read bias current is provided to the head (30A, 30B) and the effects of flux transitions on the read bias current are decoded by a read channel (68) to retrieve the data stored on the disc drive. During a write operation, the polarity of the write current is controlled by a write channel circuit (66) operating in conjunction with the preamp circuit (70) to write the data to the disc (16A, 16B).

Abstract translation: 用于在盘驱动头（30A，30B）中动态地编程读偏置和写电流的大小的装置和方法。 将数字输入值提供给数模转换器（76,78）的寄存器（80），该数字输入值表示磁头电流的期望幅度。 数模转换器（76,78）的乘法器（82）将数字输入值乘以参考电压以产生输出电压。 参考电压和输出电压之间的差分电压控制与前置放大电路（70）的前置放大器电压源（114,120）串联连接的晶体管（106）的源极到漏极电阻。 通过输入与前置放大电路（70）的前置放大器电压源（114,120）串联连接的晶体管（106）的源极到漏极电阻的不同的数字输入值。 通过输入不同的数字输入值，精确地控制晶体管（106）的源极到漏极电阻以及因此由前置放大器电压源（114,120）产生的电流的大小。 磁头电流的大小被提供为由前置放大器电压源（114,120）产生的电流的大小的倍数。 在读取操作期间，将读取的偏置电流提供给磁头（30A，30B），并且读取偏置电流的磁通转换效应由读取通道（68）解码，以检索存储在磁盘驱动器上的数据。 在写入操作期间，写入电流的极性由与前置放大器电路（70）一起操作的写入通道电路（66）来控制，以将数据写入盘（16A，16B）。