公开(公告)号：EP0091215A3

公开(公告)日：1983-11-30

申请号：EP83301340

申请日：1983-03-10

Applicant: AMPEX CORPORATION

Inventor： Chan, Steven S.

IPC: G11B05/09

CPC classification number: G01R29/027 ,  G11B20/1423 ,  H03K9/08

Abstract: To decode a binary signal without regard to the speed at which it is read, each transition in the binary signal is detected, and the time lapse between successive transitions is detemined to thereby establish the length of a pulse in the binary signal. The length of one pulse is compared with that of the immediately preceding bit cell to determine whether their lengths are approximately the same or vary by a factor of approximately 2, and any change in the binary state of the signal is determined accordingly. A multiplexing technique is employed to simultaneously decode a number of signals in this manner.

公开(公告)号：EP0052432A3

公开(公告)日：1982-12-08

申请号：EP81304903

申请日：1981-10-20

Applicant: SONY CORPORATION

Inventor： Ive, John Goodwin Spencer ,  Thirlwall, Alan Clive

IPC: G11B05/09 ,  H04N05/93

CPC classification number: H04L7/08 ,  G11B20/10 ,  G11B20/12 ,  G11B20/1806 ,  G11B27/3027 ,  G11B2220/90 ,  H04N5/935

Abstract: Apparatus for extracting synchronizing information from an incoming serial-bit digital television signal formed of a sequence of word blocks, each word block being formed of N n-bit words and each word block including a predetermined serial group of m bits forming said synchronizing information, and for de-serializing the incoming digital signal in dependence on the synchronizing information, comprises an m-stage shift register (2) through which the incoming digital signal is stepped at the bit rate of the incoming digital signal, the first shift register (2) supplying a pulse when it holds the predetermined serial group of m bits, a frequency divider (9) to derive from the incoming digital signal a word rate clock pulse signal, an n-stage shift register (4) through which each said pulse is stepped at the bit rate of the incoming digital signal, a latch circuit (10) synchronized with the word rate clock pulse signal to derive n-bit phase words the bits of which correspond respectively to the conditions of the n stages of the shift register (4), comparators (16 to 19) comparing each phase word with at least one other phase word derived N or an integral multiple of N word periods of the incoming digital signal earlier, the comparators (16 to 19) supplying a control signal only when at least one of the comparisons indicates two phase words which are identical and both contain a bit corresponding to a said pulse, the position of this bit in the phase words indicating the phasing of the word rate clock pulse signal relative to the words of the incoming digital signal, and circuits (5,6,7,24) to de-serialize the incoming digital signal into parallel-bit n-bit words under control of the control signal.

公开(公告)号：WO1997041553A1

公开(公告)日：1997-11-06

申请号：PCT/US1997007293

申请日：1997-05-01

Applicant: OVERLAND DATA, INC.

Inventor： OVERLAND DATA, INC. ,  GRAY, Martin, D.

IPC: G11B05/09

CPC classification number: G11B5/59633 ,  G11B5/00817 ,  G11B5/09

Abstract: The present invention provides an apparatus and method of partitioning a recording medium data track into two longitudinal regions and erasing any preexisting signal on each region with a DC bias signal of polarity opposite to that of the other region. Magnetic transitions subsequently recorded over the two track regions will be shifted differently depending on the relationship of the polarity of the signal being encoded to that of the DC bias erase signal applied to each region. The complementary lead/lag errors from the two track regions produce a combined read head waveform in which the timing errors are substantially eliminated, thereby reducing system bit errors rates and allowing increased data density on the medium. An apparatus and method of controlling the lateral position of the various heads are also disclosed.

Abstract translation: 本发明提供了一种将记录介质数据磁道划分成两个纵向区域并且以与其它区域的极性相反的极性的DC偏置信号擦除每个区域上的任何预先存在的信号的装置和方法。 根据被编码的信号的极性与施加到每个区域的DC偏置擦除信号的极性的关系，随后在两个轨道区域上记录的磁转变将被不同地移位。 来自两个磁道区域的互补引导/滞后错误产生组合读头波形，其中基本上消除了定时误差，从而降低了系统位错误率，并允许在介质上增加了数据密度。 还公开了控制各种磁头的横向位置的装置和方法。

公开(公告)号：WO1997041551A1

公开(公告)日：1997-11-06

申请号：PCT/IB1997000365

申请日：1997-04-08

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

Inventor： PHILIPS ELECTRONICS N.V. ,  PHILIPS NORDEN AB ,  VAN DEN ENDEN, Gijsbert, Joseph

IPC: G11B05/09

CPC classification number: G11B20/1403 ,  G11B5/09 ,  G11B20/1833 ,  H03L7/06 ,  H04L7/033 ,  H04L7/04 ,  H04L7/08 ,  H04L2007/045

Abstract: An apparatus for reproducing a digital information signal from a record carrier (4) is disclosed comprising a read unit (1) for reading a signal from a track on the record carrier, a bit detection unit (10) for deriving the digital information signal from the signal read from the track in response to a clock signal and a phase locked loop (20) for deriving the clock signal from the signal read from the track. The phase locked loop comprises a phase comparator (22) for deriving a phase error signal and a voltage controlled oscillator (32) for deriving the clock signal. The apparatus further comprises a sync pattern detector (18) for detecting sync patterns occurring in the digital information signal and a counter (14) for counting the number of bits occurring between two sync patterns in the digital information signal. If the number of bits counted between the two sync patterns exceeds a predetermined value (THR) by at least one, at least one additional bit is inserted into the digital information signal (an insertion) and this at least one additional bit should be deleted from the digital information in order to keep the apparatus in synchronisation. When the predetermined number exceeds the number of bits counted by at least one, at least one bit was deleted from the digital information signal (a deletion), so that at least one bit should be added in order to keep the apparatus in synchronisation.

Abstract translation: 公开了一种用于从记录载体（4）再现数字信息信号的装置，包括：读取单元（1），用于从记录载体上的磁道读取信号;位检测单元（10），用于从数字信息信号 响应于时钟信号从轨道读取的信号和用于从从轨道读取的信号中导出时钟信号的锁相环（20）。 锁相环包括用于导出相位误差信号的相位比较器（22）和用于导出时钟信号的压控振荡器（32）。 该装置还包括用于检测数字信息信号中出现的同步模式的同步模式检测器（18）和用于对在数字信息信号中的两个同步模式之间出现的位数进行计数的计数器（14）。 如果在两个同步模式之间计数的位数超过预定值（THR）至少一个，则至少一个附加位被插入到数字信息信号（插入）中，并且该至少一个附加位应该从 数字信息，以保持设备同步。 当预定数量超过由至少一个计数的比特数时，从数字信息信号（删除）中删除至少一个比特，从而为了保持装置保持同步，应添加至少一个比特。

公开(公告)号：WO1997027580A1

公开(公告)日：1997-07-31

申请号：PCT/US1997000770

申请日：1997-01-24

Applicant: EXABYTE CORPORATION

Inventor： EXABYTE CORPORATION ,  AYERS, Mark, R.

IPC: G11B05/09

CPC classification number: G06F3/0601 ,  G06F3/0607 ,  G06F3/0613 ,  G06F3/0614 ,  G06F3/0619 ,  G06F3/0644 ,  G06F3/0655 ,  G06F3/0656 ,  G06F3/0682 ,  G11B5/00813 ,  G11B5/00817 ,  G11B5/0083 ,  G11B5/00878 ,  G11B5/00891 ,  G11B5/012 ,  G11B5/54 ,  G11B5/5508 ,  G11B5/584 ,  G11B5/5965 ,  G11B5/59688 ,  G11B5/78 ,  G11B5/86 ,  G11B15/026 ,  G11B15/04 ,  G11B15/05 ,  G11B15/06 ,  G11B15/087 ,  G11B15/1808 ,  G11B15/1875 ,  G11B15/52 ,  G11B20/00086 ,  G11B20/10 ,  G11B20/10527 ,  G11B20/1202 ,  G11B20/1204 ,  G11B20/1205 ,  G11B20/16 ,  G11B20/18 ,  G11B20/1879 ,  G11B20/1883 ,  G11B27/032 ,  G11B27/036 ,  G11B27/107 ,  G11B27/30 ,  G11B27/3018 ,  G11B27/3027 ,  G11B27/32 ,  G11B27/328 ,  G11B27/36 ,  G11B2020/1062 ,  G11B2020/10814 ,  G11B2020/1282 ,  G11B2220/216 ,  G11B2220/90 ,  G11B2220/916 ,  G11B2220/95 ,  H04N5/765 ,  H04N5/775 ,  H04N5/782 ,  H04N5/9261

Abstract: A buried servo signal (TS) on tape (32) is modulated to provide information. According to the modulation, each of a plurality of sets of cycles (cyc) has at least a selected cycle modulated to represent at least two modulation values. The modulation of the selected cycles of a group of sets of cycles (cyc) provides a string of modulation values. The modulation values form identifiers of longitudinal physical location on tape or other tape identifying information.

Abstract translation: 在磁带（32）上的掩埋伺服信号（TS）被调制以提供信息。 根据该调制，多组周期（循环）中的每一个至少具有被选择的循环，被调制以表示至少两个调制值。 一组周期（循环）的选定周期的调制提供一串调制值。 调制值形成磁带或其他磁带识别信息上的纵向物理位置的标识符。

公开(公告)号：WO1994029855A1

公开(公告)日：1994-12-22

申请号：PCT/US1994005737

申请日：1994-05-23

Applicant: EXABYTE CORPORATION

Inventor： EXABYTE CORPORATION ,  KAUFFMAN, Gerald, C. ,  HUGHES, Timothy, C. ,  HEINS, Don ,  SLOVACEK, Patricia ,  ABOU-JAOUDE, Fadi

IPC: G11B05/09

CPC classification number: G11B27/3027 ,  G11B15/026 ,  G11B15/087 ,  G11B15/1875 ,  G11B15/4673 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B27/005 ,  G11B27/107 ,  G11B2020/183 ,  G11B2220/90

Abstract: A helical drive system (10) reads tracks (18) on a storage medium (12), including tracks which appear as distorted tracks. Each track (18) comprises a plurality of blocks of data, with each block having unique block-identifying information. A read head (16C) traverses predetermined original azimuthal paths (P0) across the storage medium (12) for reading the blocks recorded along each of the original azimuthal paths (P0). A controller (50) uses the block-identifying information to determine whether any blocks expected to be read during the traversal of the original azimuthal paths (P0) were not read. If expected blocks were not read, the controller (50) rewinds or otherwise reverses the direction of travel of the storage medium (12); sends a signal to a tape transport drive (81) to slow the speed of the medium (12); and, directs that the medium (12) be re-read at a slower tape re-read speed. During the slow re-read attempt, the read head (16C) traverses modified azimuthal paths (P1, P2, P3,... P10) which are separated from one another by a distance less than the track pitch, thereby providing opportunities to read blocks which would not otherwise be read due to distortion of the tracks (18).

Abstract translation: 螺旋驱动系统（10）读取存储介质（12）上的轨道（18），包括显示为失真轨道的轨道。 每个轨道（18）包括多个数据块，每个块具有唯一的块识别信息。 读头（16C）穿过存储介质（12）的预定的原始方位路径（P0），用于读取沿着每个原始方位路径（P0）记录的块。 控制器（50）使用块识别信息来确定是否未读取在原始方位路径（P0）遍历期间期望被读取的块。 如果预期的块未被读取，则控制器（50）倒回或以其它方式颠倒存储介质（12）的行进方向; 向磁带传送驱动器（81）发送信号以减慢介质（12）的速度; 并且指示以更慢的磁带重新读取速度重新读取介质（12）。 在缓慢的重新读取尝试期间，读取头（16C）穿过彼此分开距离小于轨道间距的修改的方位角路径（P1，P2，P3，... P10），从而提供阅读的机会 由于轨道（18）的失真而不会读取的块。

公开(公告)号：WO1992016933A1

公开(公告)日：1992-10-01

申请号：PCT/JP1992000340

申请日：1992-03-19

Applicant: KABUSHIKI KAISHA CSK ,  IZAWA, Shigeru

Inventor： KABUSHIKI KAISHA CSK

IPC: G11B05/09

CPC classification number: G06K1/125 ,  G06K5/00 ,  G11B5/09

Abstract: A code data recording method of recording magnetically code data on a magnetic card (1) having a magnetic layer for reading and writing data magnetically. A plurality of belt-like bar marks (2a, 2b) whose widths are different from each other, are arranged to form a code. One or more code having the same data are magnetically recorded repeatedly. Thereby, even when a part of the bar marks cannot be read, that is, the code data cannot be read because of the contamination or damage of the magnetic card (1), from the remained parts of the bar marks, the whole of the code data can be reproduced.

Abstract translation: 一种在具有用于磁读取和写入数据的磁性层的磁卡（1）上记录磁性代码数据的代码数据记录方法。 布置多个宽度彼此不同的带状条形标记（2a，2b）以形成代码。 具有相同数据的一个或多个代码被重复地磁记录。 因此，即使当一部分条形码不能被读取时，也就是说，由于磁卡（1）的污染或损坏，代码数据不能从条痕的剩余部分读取，因此， 代码数据可以被再现。

公开(公告)号：WO1990015407A1

公开(公告)日：1990-12-13

申请号：PCT/US1990003167

申请日：1990-06-05

Applicant: MAXTOR CORPORATION

Inventor： MAXTOR CORPORATION ,  WILSON, Rosser, S. ,  SEUBERLING, Frank

IPC: G11B05/09

CPC classification number: G11B27/30 ,  G11B20/1258 ,  G11B27/105 ,  G11B2020/1282 ,  G11B2020/1284

Abstract: In the present invention, a single sector counter and accompanying multiple buffer registers (46-48) are used to provide the sector count for a plurality of recording zones. Initially, the sector counter is validated by synchronizing it with an index mark. In one embodiment, an angular position sensing counter (135) counts a clock having a frequency and phase to match the occurrence of segments in a reference zone. A look up table or computation provides an offset value representing the difference between each reference zone segment boundary, and the occurrence of the next consecutive sector in each of the recording zones. Additional logic (25) generates periodic sector pulses once the zone transition has been accomplished, and provides means to prevent generation of shortened sector intervals. This permits rapid validation of the sector signal so that it is no longer necessary to wait for the index in a hard-sectored drive before establishing the sector position when changing zones. This improves the latency of the disk drive and overall system performance.

公开(公告)号：WO1989003575A1

公开(公告)日：1989-04-20

申请号：PCT/JP1988001041

申请日：1988-10-12

Applicant: VICTOR COMPANY OF JAPAN, LTD. ,  WATANABE, Noboru

Inventor： VICTOR COMPANY OF JAPAN, LTD.

IPC: G11B05/09

CPC classification number: G11B5/09 ,  G11B5/00 ,  G11B5/02

Abstract: A vertically anisotropic medium or a vertical recording system for conducting unoriented recording. The system has a terminal for receiving binary signals that are to be recorded, a ring head for causing magnetic change in the medium, and a recording current generating circuit for generating a recording current that drives the ring head. The recording current is a sequence of fine pulses whose polarities change in response to the direction of change of polarities of the binary signal, and nonzero intervals of a neutral level are inserted between the neighboring fine pulses having opposite polarities relative to each other. The pulses are given a duration TW which satisfies a relationship TW

Abstract translation: 用于进行无取向记录的垂直各向异性介质或垂直记录系统。 该系统具有用于接收要记录的二进制信号的终端，用于引起介质中的磁变化的环形头，以及用于产生驱动环形头的记录电流的记录电流产生电路。 记录电流是其极性响应于二进制信号的极性变化方向而改变的精细脉冲序列，并且中性电平的非零间隔被插入相对于彼此具有相反极性的相邻细微脉冲之间。 脉冲被给予持续时间TW，其满足关系TW

公开(公告)号：WO1985000068A1

公开(公告)日：1985-01-03

申请号：PCT/JP1984000313

申请日：1984-06-15

Applicant: SONY CORPORATION ,  OSAWA, Eiichi ,  TANAKA, Masato ,  YOSHIZAWA, Mamoru ,  NAKAI, Jun ,  KOJIMA, Yuichi

Inventor： SONY CORPORATION

IPC: G11B05/09

CPC classification number: G11B20/1866 ,  G11B5/0083 ,  G11B5/00878 ,  G11B5/00891 ,  G11B20/1202 ,  G11B20/1204 ,  G11B20/1809 ,  G11B2020/10546 ,  G11B2020/1087 ,  G11B2020/10879 ,  G11B2220/90

Abstract: A method of recording a digital data signal, such as an audio PCM signal, onto a recording medium in the longitudinal direction thereof, together with an apparatus which is suitable for this recording method. Even-numbered words and odd-numbered words in a digital data signal are recorded on a first track group and a second track group, respectively, which are separated from each other in the widthwise direction of a recording medium, to prevent a series of words becoming error words because of, for example, a flaw in the recording medium in the longitudinal direction thereof. The data format is changed at the input and output of a recording encoder to enable an error correction code and a recording circuit to be used in common for digital tape recorders which have different numbers of tracks, e.g., n tracks and 2n tracks. When an error correction code is recorded in such a manner that one word in the digital data signal is divided into a plurality of symbols which are formed into an error correction code, a plurality of symbols of the same word are recorded at a position at which error correlation is strong, making effective use of the error correction capacity of the error correction code.