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公开(公告)号：EP0898813A1
公开(公告)日：1999-03-03
申请号：EP97952555.0
申请日：1997-12-18
申请人： QUANTUM CORPORATION
CPC分类号： G11B5/59605 , G11B5/5547 , G11B5/59655 , G11B20/10009 , G11B20/1258 , G11B21/085 , G11B21/106 , H03M1/201
摘要： An analog to digital converter circuit (20) in a sampling data detection channel of a disk drive synchronously samples user data in a data track areas at a first quantization resolution and samples servo bursts from the spoke areas at a second quantization resolution effectively greater than said first quantization resolution. An offset circuit (60) provides a predetermined analog offset signal to a combining circuit (160, 170) which combines it with an incoming analog signal to provide a composite signal during a servo burst sampling interval. An analog to digital converter (180, 190) samples the composite signal during the servo spoke burst sampling interval, and synchronously samples the analog signal during a user data sampling interval. A digital averaging circuit (210) averages the servo spoke samples over a predetermined averaging interval to provide averaged burst samples having increased bit resolution.
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公开(公告)号：EP0799472A1
公开(公告)日：1997-10-08
申请号：EP96936255.0
申请日：1996-10-07
申请人： QUANTUM CORPORATION
CPC分类号： G11B20/10009 , G11B20/1258 , G11B20/1426
摘要： The new method for overlapping block read events in a disk drive (10) having synchronously sampled data detection channels is presented. In particular, the new method is for overlapping read back processing by real-time and digital signal processing of first and second data blocks from a storage medium (12). The medium includes steps of clocking real-time (58) and digital signal processes (56) by a data transducer head, clocking the digital signal processes for the first data block by an asynchronous clock operating at a nominal data clocking rate after the first data block has passed by the data transducer head (16) and before a clock has synchronized to the second data block following the first data block, and clocking real-time signal processes for the second data block and completing clocking of the digital processes for the first data block by a clock synchronized to the second data block passing by the transducer head. The storage medium may be a magnetic hard disk, magnetic tape, or an optical disk, for example.
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3.发明公开SYNCHRONOUS DETECTION OF WIDE BI-PHASE CODED SERVO INFORMATION FOR DISK DRIVE 失效功率信息广泛双相形式DRIVE同步检测
公开(公告)号：EP0804846A1
公开(公告)日：1997-11-05
申请号：EP96936732.0
申请日：1996-10-17
申请人： QUANTUM CORPORATION
发明人： LEIS, Michael, D. , PATAPOUTIAN, Ara , VEA, Mathew, P. , EHRLICH, Richard, M. , FISHER, Kevin, D. , HENSON, James, A. , AKIN, William, R., Jr.
CPC分类号： G11B20/10009 , G11B5/5526 , G11B5/59627 , G11B5/5965 , G11B5/59655 , G11B5/59688 , G11B20/1833 , G11B21/083 , G11B27/3027 , G11B2220/20 , H04L25/4904
摘要： A magnetic disk drive (10) data storage disk (16) defines recording tracks divided into data sectors by narrow servo spokes. A data sector lying between servo spokes is recorded with user data encoded in accordance with a code having a predetermined distance and user data code rate. Each servo spoke of the recording area has at least one servo information field encoded in a wide bi-phase code pattern. The disk drive (10) further includes a synchronous sampling data detection channel having a data transducer head (26) positioned by a servo-controlled actuator (67) over the recording track, a preamplifier (28) for receiving electrical analog signals magnetically induced by the data transducer head (26) from flux transitions present in at least the servo information field, a digital sampler (46) for synchronously sampling the electrical analog signals to produce digital samples, and wide bi-phase decoding circuitry (52) coupled to receive digital samples from the synchronous sampling data detection channel for decoding the wide bi-phase code pattern.
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公开(公告)号：EP0799472B1
公开(公告)日：2002-06-12
申请号：EP96936255.7
申请日：1996-10-07
申请人： QUANTUM CORPORATION
CPC分类号： G11B20/10009 , G11B20/1258 , G11B20/1426
摘要： The new method for overlapping block read events in a disk drive (10) having synchronously sampled data detection channels is presented. In particular, the new method is for overlapping read back processing by real-time and digital signal processing of first and second data blocks from a storage medium (12). The medium includes steps of clocking real-time (58) and digital signal processes (56) by a data transducer head, clocking the digital signal processes for the first data block by an asynchronous clock operating at a nominal data clocking rate after the first data block has passed by the data transducer head (16) and before a clock has synchronized to the second data block following the first data block, and clocking real-time signal processes for the second data block and completing clocking of the digital processes for the first data block by a clock synchronized to the second data block passing by the transducer head. The storage medium may be a magnetic hard disk, magnetic tape, or an optical disk, for example.
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5.发明授权SYNCHRONOUS DETECTION OF CONCURRENT SERVO BURSTS FOR FINE HEAD POSITION IN DISK DRIVE 失效竞争力的同步检测阵阵对头精确定位磁盘驱动器
公开(公告)号：EP0786133B1
公开(公告)日：2001-12-19
申请号：EP95932403.9
申请日：1995-09-08
申请人： QUANTUM CORPORATION
IPC分类号： G11B5/596
CPC分类号： G11B5/59655
摘要： Synchronous detection of fine position servo information within a partial response maximum likelihood (PRML) data channel. Servo information (17) is recorded as a pair or series of fractional-track-width sinewave concurrent burst patterns producing an on-track phase generating a position error signal varying linearly about track centerline and at least one off-track phase generating a position error signal related to track boundary. Head (26) generates on-track phase and off-track phase analog signals that are gain normalized (40) and synchronously quantized (46). Mulfiplying by a normalization factor from a correlation signal generator (64) during servo sampling intervals provides normalized samples, integrating (66) on-track phase normalized samples provides on-track position error signal (82), and integrating (66) off-track phase normalized samples provides an off-track position error signal (88). A discrete matched filter is also used.
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6.发明授权BIT-INTERLEAVED RATE 16/17 MODULATION CODE WITH THREE-WAY BYTE-INTERLEAVED ECC 失效与三元BYTEVERSCHACHTELTEM纠错码位交错16/17调制码
公开(公告)号：EP0846374B1
公开(公告)日：2001-03-28
申请号：EP96928830.7
申请日：1996-08-08
申请人： QUANTUM CORPORATION
CPC分类号： G11B20/1866 , G11B20/10009 , G11B20/1426 , G11B2020/1434 , G11B2020/1446 , H03M13/27
摘要： A modulation method generates a rate 16/17 (d = 0, G = 7/I = 11) modulation code for transferring user digital data bytes having a three-way ECC interleave through a data transfer channel in accordance with the steps of: shuffling (112, 114) the user data bytes in order to rearrange an order of the bytes in a predetermined manner and putting out AiBi byte pairs, encoding (116) eight bits of the Ai bytes of the AiBi byte pairs in accordance with a predetermined rate 8/9 modulation code to produce nine code bits a0-a8, and interleaving (130) the nine code bits a0-a8 of each Ai byte with eight unencoded bits of each Bi byte in accordance with a predetermined bitwise interleave pattern to generate the rate 16/17 modulation code. A preferred code and circuitry for the modulation method are also described.
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公开(公告)号：EP0890170B1
公开(公告)日：2000-03-15
申请号：EP97953490.6
申请日：1997-12-31
申请人： QUANTUM CORPORATION
CPC分类号： H03M5/145 , G11B20/1426 , G11B2020/1434 , G11B2020/1446 , G11B2020/1449
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8.发明公开SYNCHRONOUS DETECTION OF CONCURRENT SERVO BURSTS FOR FINE HEAD POSITION IN DISK DRIVE 失效同步检测磁盘驱动器中精细磁头位置的并发伺服冲击
公开(公告)号：EP0786133A1
公开(公告)日：1997-07-30
申请号：EP95932403.0
申请日：1995-09-08
申请人： QUANTUM CORPORATION
CPC分类号： G11B5/59655
摘要： Synchronous detection of fine position servo information within a partial response maximum likelihood (PRML) data channel. Servo information (17) is recorded as a pair or series of fractional-track-width sinewave concurrent burst patterns producing an on-track phase generating a position error signal varying linearly about track centerline and at least one off-track phase generating a position error signal related to track boundary. Head (26) generates on-track phase and off-track phase analog signals that are gain normalized (40) and synchronously quantized (46). Mulfiplying by a normalization factor from a correlation signal generator (64) during servo sampling intervals provides normalized samples, integrating (66) on-track phase normalized samples provides on-track position error signal (82), and integrating (66) off-track phase normalized samples provides an off-track position error signal (88). A discrete matched filter is also used.
摘要翻译： 在部分响应最大似然（PRML）数据信道内的精细位置伺服信息的同步检测。 伺服信息（17）被记录为一对或一系列分数轨道宽度的正弦波同时突发模式，产生轨道上相位，产生关于轨道中心线线性变化的位置误差信号，以及至少一个偏离轨道相位产生位置误差 与轨道边界有关的信号。 头（26）产生轨道上相位和偏离轨道相位模拟信号，其被增益归一化（40）并被同步量化（46）。 在伺服采样间隔期间通过来自相关信号发生器（64）的归一化因子进行解析提供了归一化样本，积分（66）轨道上相位归一化采样提供轨道上位置误差信号（82）和积分（66）偏离轨道 相位归一化样本提供偏离轨道位置误差信号（88）。 还使用离散匹配滤波器。
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公开(公告)号：EP0890170A1
公开(公告)日：1999-01-13
申请号：EP97953490.0
申请日：1997-12-31
申请人： QUANTUM CORPORATION
CPC分类号： H03M5/145 , G11B20/1426 , G11B2020/1434 , G11B2020/1446 , G11B2020/1449
摘要： Rate 24/25 modulation encoding methods and apparatus improve efficiency in a PRML magnetic recording channel. The rate 24/25 code word uses rate 8/9 RLL endocing of one byte of user data, combined with interleaved unencoded bytes to achieve improved code rates with reasonable global run length constraint. Use of the rate 8/9 RLL (0,3) subcode results in a rate 24/25 RLL (0,11) code, while a rate 8/9 (0,6/5) subcode results in a rate 24/25 RLL (0,14/13) code.
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10.发明公开BIT-INTERLEAVED RATE 16/17 MODULATION CODE WITH THREE-WAY BYTE-INTERLEAVED ECC 失效与三元BYTEVERSCHACHTELTEM纠错码位交错16/17调制码
公开(公告)号：EP0846374A1
公开(公告)日：1998-06-10
申请号：EP96928830.0
申请日：1996-08-08
申请人： QUANTUM CORPORATION
CPC分类号： G11B20/1866 , G11B20/10009 , G11B20/1426 , G11B2020/1434 , G11B2020/1446 , H03M13/27
摘要： A modulation method generates a rate 16/17 (d = 0, G = 7/I = 11) modulation code for transferring user digital data bytes having a three-way ECC interleave through a data transfer channel in accordance with the steps of: shuffling (112, 114) the user data bytes in order to rearrange an order of the bytes in a predetermined manner and putting out AiBi byte pairs, encoding (116) eight bits of the Ai bytes of the AiBi byte pairs in accordance with a predetermined rate 8/9 modulation code to produce nine code bits a0-a8, and interleaving (130) the nine code bits a0-a8 of each Ai byte with eight unencoded bits of each Bi byte in accordance with a predetermined bitwise interleave pattern to generate the rate 16/17 modulation code. A preferred code and circuitry for the modulation method are also described.
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