公开(公告)号：EP0161875A3

公开(公告)日：1987-10-28

申请号：EP85303134

申请日：1985-05-02

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Isshiki, Masanori c/o Patent Division

IPC: G11B05/02 ,  G11B05/62 ,  G11B05/03

CPC classification number: H04N9/8355 ,  G11B5/00 ,  G11B5/02 ,  G11B5/1278 ,  G11B5/70678

Abstract: A method for superimposed recording of a first signal and a second signal with frequency which is less than the frequency for the first signal, in a perpendicular magnetic recording medium by means of a ring-shaped magnetic head. The mutually superimposed first and second signals are supplied to the magnetic head. The value of the first signal current to be supplied to the magnetic head is set at a value which is greater than the current value for which the reproduced output level of the first signal that was recorded on the magnetic recording medium attains a maximum, and a satisfactory superimposed recording characteristic can be obtained by such an arrangement.

公开(公告)号：EP0091204A3

公开(公告)日：1986-10-22

申请号：EP83301248

申请日：1983-03-08

Applicant: AMPEX CORPORATION

Inventor： Fawkes, John S.

IPC: G11B05/02 ,  G11B15/52 ,  G11B27/32 ,  G11B05/03

CPC classification number: G11B5/03 ,  G11B27/322 ,  H03K17/64

Abstract: A constant current source (14) is combined with a fixed AC bias circuit (34) to supply a constant current biased drive signal to a record head (58). A voltage doubler (48) may be used to double the current to the head.

公开(公告)号：EP0087907A3

公开(公告)日：1985-10-09

申请号：EP83300909

申请日：1983-02-22

Applicant: Racal Recorders Ltd

Inventor： Crick, Neil Martyn ,  Miles, Anthony

IPC: G11B05/02 ,  G11B27/36

CPC classification number: G11B20/025 ,  G11B20/182 ,  G11B27/36

Abstract: An automatic calibration arrangement for a tape recorder is disclosed. The arrangement includes a microprocessor 36 which responds to pre-stored calibration signals stored in a ROM 38 and a RAM 40 to write predetermined tones onto each track of the tape using the record circuits and record heads of the tape recorder, and then monitors the corresponding signals as replayed by the replay heads and replay circuits of the tape recorder so as to automatically adjust parameters of the record and replay circuits accordingly. The record and replay circuits are arranged to be settable by means of digital numbers produced by the microprocessor. Parameters which may be adjusted include record bias, record drive current (to produce 1% third harmonic distortion), and the mid band and band edge filter circuits, and phase adjustment of the replay circuits. Recorders not having replay circuits (but having replay heads) can still have their bias level and record current calibrated and can record replay calibration frequencies for external calibration purposes.

公开(公告)号：EP0101179A3

公开(公告)日：1985-09-18

申请号：EP83303976

申请日：1983-07-07

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Todd, Craig C.

IPC: G11B05/04 ,  G11B05/02

CPC classification number: G11B20/22 ,  H04N9/7908 ,  H04N9/802

Abstract: This invention reduces crosstalk interference components without a significant increase in recorded bandwidth of the modulated audio signals and without a significant degradation of the signal-to-noise ratio of the reproduced audio signals. According to the invention, the nominal carrier frequency of the modulated audio signal in adjacent tracks or scans is offset by an amount sufficient to shift the crosstalk interference components outside the desired audio pass band for substantially all modulating amplitudes and frequencies. At the same time, the modulated audio frequency spectra of the adjacent tracks substantially overlap so that additional overall bandwidth requirements are minimized. A satisfactory offset from track to track is in the order of twice the maximum audio response frequency. As the offset is reduced or as occasional high frequency high amplitude audio occurs in adjacent tracks, crosstalk distortion components will tend to appear beginning at the high frequencies. Such crosstalk interference can be further reduced by the use of frequency dependent compressor-expander noise reduction because of the audio band rather than across the entire audio band as in the case of no track-to-track carrier offset, In one example audio signals are frequency modulated and recorded on a helical scan recorder using carrier frequencies f 1 and f 2 for odd and even scans. On playback the signals from odd and even scans are processed by respective limiters 6 and 8 respective demodulators 10 and 12 and respective high pass filters 14 and 16.

Abstract translation: 本发明可减少串扰干扰成分，而不会明显增加已调音频信号的记录带宽，并且不会显着降低再生音频信号的信噪比。 根据本发明，相邻轨道或扫描中的调制音频信号的标称载波频率偏移足以将基本上所有调制幅度和频率的所需音频通带外的串扰干扰分量移位的量。 同时，相邻轨道的调制音频频谱基本上重叠，使得额外的总带宽要求最小化。 从轨道到轨道的令人满意的偏移量是最大音频响应频率的两倍。 随着偏移减小或偶尔的高频高振幅音频发生在相邻轨道中，串扰失真分量将倾向于从高频开始出现。 由于干扰定位在音频的一部分而不是整个音频带的倾向，因此使用频率相关的压缩器 - 扩展器噪声降低可以进一步降低这种串扰干扰，如在没有跟踪的情况下 曲线载波偏移。

公开(公告)号：EP0130843A3

公开(公告)日：1985-08-28

申请号：EP84304567

申请日：1984-07-04

Applicant: Hawkins, John William

Inventor： Hawkins, John William

IPC: G11B05/02 ,  G11B20/00 ,  G11B23/28

CPC classification number: G11B20/00927 ,  G11B20/00086

Abstract: A method of recording information, comprising the steps of:
(a) providing a magnetic storage means having magnetisable material and deliberately inhibiting the magnetic properties of said material over a zone of said storage means (b) determining an inhibition value related to and indicative of at least one of the location and area of said zone, said inhibition value being specific to the one particular storage means deliberately inhibited in step (a), and (c) subsequently recording said information in a manner such that replay thereof is only possible if a signal corresponding to the said inhibition value specific to that said particular storage means is first obtained. Determination of said inhibition value is by means of a computer program providing the sub-steps of
(i) writing repeatedly a predetermined number of times to said storage means over an area including (at least part of) said zone a character set composed of at least one character (ii) reading back the matter written over said area, and (iii) calculating the difference between the number of times said character set was written and was read back, the value of this difference providing said inhibition value. Recording step (c) includes the provision of an initialising program which comprises a repetition of the same sub-steps (i), (ii) and (iii) but the difference value last found is compared with the inhibition value first obtained and if a predetermined matching requirement is fulfilled by this comparison then said signal is generated. The invention also provides a magnetic storage means or recording medium to which method steps (a) and (b) have been applied, method step (c) being applied to another zone of the same storage means/recording medium or to another storage means/recording medium that is paired with the first.

Abstract translation: 一种记录信息的方法，包括以下步骤：（a）提供具有可磁化材料的磁存储装置，并蓄意地抑制所述材料在所述存储装置的区域上的磁特性（b），确定与所述存储装置相关的并指示 所述区域的位置和区域中的至少一个，所述抑制值特定于在步骤（a）中被故意抑制的一个特定存储装置，以及（c）随后以这样的方式记录所述信息，使得只有 首先获得与所述特定存储装置特有的所述抑制值对应的信号。 所述抑制值的确定是通过提供以下子步骤的计算机程序：（i）在包括（至少部分）所述区域的区域上重复写入预定次数到所述存储装置的区域，由 至少一个字符（ii）回读在所述区域上写入的事物，和（iii）计算写入并读出的字符集的次数之间的差异，该差异值提供所述抑制值。 记录步骤（c）包括提供包括相同子步骤（i），（ii）和（iii）的重复的初始化程序，但是最后找到的差值最终与首先获得的抑制值进行比较， 通过该比较来满足预定匹配要求，则产生所述信号。 本发明还提供一种已应用了方法步骤（a）和（b）的磁存储装置或记录介质，方法步骤（c）被应用于同一存储装置/记录介质的另一个区域或另一存储装置/ 与第一个配对的记录介质。

公开(公告)号：WO1999026237A1

公开(公告)日：1999-05-27

申请号：PCT/CN1997000123

申请日：1997-11-13

Applicant: VASTAR TECHNOLOGY CORPORATION ,  WEN, Chiawen

Inventor： VASTAR TECHNOLOGY CORPORATION

IPC: G11B05/02

CPC classification number: G06K7/00

Abstract: This invention relates to an audio magnetic card and the method as well as the apparatus using the card. This design enables the apparatus to store the audio data on the IC memory body embedded in the card and to reproduce the stored data from the IC body. Combining the content and the outline, this card has effectiveness of vision sensing and audio hearing, as well as the value of collection and preservation.

Abstract translation: 本发明涉及一种音频磁卡和该方法以及使用该卡的装置。 该设计使得设备能够将音频数据存储在嵌入在卡中的IC存储器体上并从IC体再现存储的数据。 结合内容和大纲，该卡具有视觉感知和音频听觉的有效性，以及收集和保存的价值。

公开(公告)号：WO1997019445A1

公开(公告)日：1997-05-29

申请号：PCT/IB1996001211

申请日：1996-11-12

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

Inventor： PHILIPS ELECTRONICS N.V. ,  PHILIPS NORDEN AB ,  RAMALHO, Joao, Nuno, Vila, Lobos ,  DESBONNETS, Eric, Bernard, Marie, François

IPC: G11B05/02

CPC classification number: G11B5/022 ,  G11B5/02 ,  G11B5/09 ,  H03F1/14 ,  H03F3/45071

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 (Cp1, Cp2) of the write amplifier (4) at the write terminals (6, 8) are compensated by means of feed-forward capacitors (170, 172, 174, 176). 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。 通过前馈电容器（170,172）补偿在写入端（6,8）处的写入头（2）和/或写入放大器（4）的寄生电容（Cp1，Cp2）之间的寄生电容 ，174,176）。 写头（2）的端子（6,8）处的高阻抗使写入头（2）两端的共模电压可通过共模电路固定在任何所需的电压值。

公开(公告)号：WO1996038838A2

公开(公告)日：1996-12-05

申请号：PCT/IB1996000477

申请日：1996-05-21

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

Inventor： PHILIPS ELECTRONICS N.V. ,  PHILIPS NORDEN AB ,  FURUYA, Hideaki

IPC: G11B05/02

CPC classification number: G11B5/02 ,  G11B5/0086 ,  G11B20/24

Abstract: It is to provide that a magnetic reproduction apparatus with a cross-talk reducing system for improving an S/N respect of a reproducing signal by reproducing (compensating) the cross-talk component. A distance between a first magnetic head (4) which has a plus azimuth angle and a second magnetic head (5) which has a minus azimuth angle is provided, so that a second head (5) can scan a track which is scanned before by a first head (4). Furthermore, a delaying circuit (10) for delaying a first reproduction signal of the first head (4), a first filter (4) for extracting a first cross-talk component from an output of the delaying circuit (10), a second filter (5) for extracting a second cross-talk component from a second reproduction signal of the second head (5), a first adder (12) for adding the second cross-talk component which is reversed a polarity and the output of the delaying circuit (10) and a second adder (14) for realizing an adder processing between the output of the delaying circuit which is reversed a polarity and the second reproduction signal.

Abstract translation: 提供具有串扰减少系统的磁性再现装置，用于通过再现（补偿）串扰分量来改善再现信号的S / N方面。 提供具有正方位角的第一磁头（4）和具有负方位角的第二磁头（5）之间的距离，使得第二磁头（5）可以扫描先前被扫描的磁道 第一个头（4）。 此外，用于延迟第一头（4）的第一再现信号的延迟电路（10），用于从延迟电路（10）的输出中提取第一串扰分量的第一滤波器（4），第二滤波器 （5），用于从第二头（5）的第二再现信号中提取第二串扰分量;第一加法器（12），用于将与极性相反的第二串扰分量和延迟电路的输出相加; （10）和第二加法器（14），用于实现在极性反转的延迟电路的输出和第二再现信号之间的加法器处理。

公开(公告)号：WO1991000594A1

公开(公告)日：1991-01-10

申请号：PCT/US1990003588

申请日：1990-06-29

Applicant: SEAGATE TECHNOLOGY, INC.

Inventor： SEAGATE TECHNOLOGY, INC. ,  ROBINSON, Don, Michael

IPC: G11B05/02

CPC classification number: G06F3/0601 ,  G06F2003/0692 ,  G11B5/012 ,  G11B5/5534 ,  G11B20/1883 ,  G11B23/36 ,  G11B27/36 ,  G11B33/10 ,  G11B2020/10916 ,  G11B2220/20

Abstract: A disc drive wherein at least two outer tracks of the disc in a region (15) beyond the defined track 0 are used to store the drive operating microprogram, and/or manufacturing test program, and/or specific electrical, mechanical and magnetic parameters and media defect information. This data can be read from these outer tracks of the disc during initialization of the disc drive, or during seek operations of the drive to immediately adjust the positioning of the read/write head. It allows the disc drive to react to microprogram problems without changing either the mask ROM or an EPROM supplied. The microprogram is read onto the drive over the I/O interface.

Abstract translation: 一种盘驱动器，其中超过定义的轨道0的区域（15）中的盘的至少两个外轨迹用于存储驱动操作微程序，和/或制造测试程序，和/或特定的电，机械和磁参数，以及 媒体缺陷信息。 在盘驱动器的初始化期间或在驱动器的搜索操作期间可以从盘的这些外部轨道读取该数据，以便立即调整读/写头的定位。 它允许磁盘驱动器对微程序问题做出反应，而不需要更改掩模ROM或提供的EPROM。 微程序通过I / O接口读取到驱动器上。

公开(公告)号：WO1989004534A1

公开(公告)日：1989-05-18

申请号：PCT/SU1988000227

申请日：1988-11-11

Applicant: VSESOJUZNY NAUCHNO-ISSLEDOVATELSKY INSTITUT ... ,  FRIDLYAND, Igor Vladimirovich

Inventor： VSESOJUZNY NAUCHNO-ISSLEDOVATELSKY INSTITUT ...

IPC: G11B05/02

CPC classification number: G11B5/02 ,  G11B5/00 ,  G11B5/0086 ,  G11B5/52 ,  G11B15/1808

Abstract: A method of magnetic recording consisting in line recording of an electric signal on a magnetic medium (1) by means of magnetic heads (8) oscillating in a plane perpendicular to the surface of the magnetic medium with sinusoidally changing speeds the maximum values of which being equal, their periods of oscillation being dividable by the period of the electric control signal and the magnetic heads (8) oscillating in mutual counter-phase mode. A device for implementing the method of magnetic video recording comprises a magnetic medium (1), magnetic heads (8) effecting the line recording of the electric signal and a stable magnetic head (10) effecting the longitudinal recording of the electric control signal. The outputs of delay elements (3), interconnected in series, are electrically connected to mechanisms (14). The device further comprises, interconnected in series, a first frequency multiplier (20), whose input is connected to the electric control signal source (7) and whose output is connected to the input of the mechanism (14) for movement of the magnetic head (8) and to the input of the first delay element (19), a second frequency multiplier (22), a pulse counter (23) and a switch (24) the outputs of which are connected to the windings (22) of the magnetic heads (8).