中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

113 records (took 0.02 seconds)

    A magnetic disk sampled amplitude read channel employing interpolated timing recovery for synchronous detection of embedded servo data
    3.
    发明授权
    A magnetic disk sampled amplitude read channel employing interpolated timing recovery for synchronous detection of embedded servo data 失效
    读取的磁盘采样幅度信道与内插在时钟脉冲的恢复为嵌入伺服数据的同步检测

    公开(公告)号：EP0777211B1

    公开(公告)日：2002-04-03

    申请号：EP96119296.0

    申请日：1996-12-02

    Applicant: CIRRUS LOGIC, INC.

    Inventor： Reed, David E. ,  Bliss, William G.

    IPC: G11B5/02 ,  G11B5/09 ,  G11B20/10 ,  G11B20/14 ,  G11B20/08

    CPC classification number: H04L7/0029 ,  G11B5/09 ,  G11B20/10009 ,  G11B20/10037 ,  G11B20/10055 ,  G11B20/10064 ,  G11B20/10074 ,  G11B20/1258 ,  G11B20/1403 ,  G11B2020/10888 ,  G11B2020/1234 ,  G11B2020/1282 ,  H04L7/0004 ,  H04L7/0062 ,  H04L2007/047

    Abstract: A sampled amplitude read channel reads user data and embedded servo data stored on a magnetic medium by detecting digital data from a sequence of discrete time interpolated sample values. A write frequency synthesizer generates a write clock for writing digital data to the magnetic medium at a predetermined baud rate for a selected zone, and upon read back, a read frequency synthesizer generates a fixed sampling clock at a frequency slightly higher than the write frequency at the outer zone. A sampling device samples the analog read signal at this fixed sampling rate across the data zones and servo wedges to generate a sequence of discrete time channel samples that are not synchronized to the baud rate. Before sampling, an analog receive filter processes the read signal to attenuate aliasing noise without having to adjust its spectrum across data zones or servo wedges. A discrete time equalizing filter equalizes the channel samples according to a predetermined partial response (PR4, EPR4, EEPR4, etc.). An interpolating timing recovery circuit, responsive to the equalized channel samples, computes an interpolation interval tau and, in response thereto, generates interpolated sample values substantially synchronized to the baud rate. The timing recovery circuit also generates a synchronous data clock for clocking a discrete time sequence detector and pulse detector which detect the digital user and servo data from the interpolated sample values.

    ON-THE-FLY SPLITTING OF DISK DATA BLOCKS
    5.
    发明授权
    ON-THE-FLY SPLITTING OF DISK DATA BLOCKS 失效
    一盘的数据块立即分离

    公开(公告)号：EP0611474B1

    公开(公告)日：1998-11-11

    申请号：EP93921445.8

    申请日：1993-09-07

    Applicant: QUANTUM CORPORATION

    Inventor： BUCH, Bruce, D.

    IPC: G11B20/12 ,  G11B20/10

    CPC classification number: G11B19/04 ,  G11B19/02 ,  G11B20/10 ,  G11B20/1258 ,  G11B2020/1282 ,  G11B2020/1284

    Abstract: A disk in a disk drive has radial spokes (14) wherein servo bursts are recorded, and multiple concentric bands (20) holding data blocks (16) in predefined block frames (22). To maximize data density, the data rate in each band (20) is proportional to the band radius, and the ratio of block frames (22) to spokes (14) in a given band (20) may be non-integral. In such bands (20), some data blocks (16) are split by a spoke (14). A disk controller in the disk drive uses a byte position accumulator (BPA) (84) when splitting a data block (16). During the transfer of a data block (16), the BPA (84) counts at the nominal data transfer rate to continually identify by its position in the data block (16) a byte therein to be transferred shortly. The BPA (84) output feeds a latch which is normally open to receive the BPA output. A timer (64) within the disk controller establishes the rotational time at which the data transfer must be suspended to avoid a spoke (14). The timer (64) generates an early warning signal (EW2) in advance of this time which closes the latch (88). The value in the closed latch (88) is the position of the last data byte to be transferred before the split. A comparator (82) indicates when a count of bytes transferred has reached the value in the latch (88); the data transfer is then suspended until the spoke (14) has passed.

    Data recording disk drive
    9.
    发明公开
    Data recording disk drive 失效
    Datenaufzeichnungsdiskettenlaufwerk。

    公开(公告)号：EP0660324A2

    公开(公告)日：1995-06-28

    申请号：EP94309305.4

    申请日：1994-12-13

    Applicant: International Business Machines Corporation

    Inventor： Hetzler, Steven Robert ,  Kabelac, William John

    IPC: G11B20/12 ,  G11B27/30

    CPC classification number: G11B20/10 ,  G11B5/5526 ,  G11B5/59655 ,  G11B19/12 ,  G11B20/1258 ,  G11B20/1883 ,  G11B20/1889 ,  G11B21/083 ,  G11B21/106 ,  G11B27/3027 ,  G11B2020/1234 ,  G11B2020/1282 ,  G11B2220/20

    Abstract: A sector servo, zone bit recording disk drive (202) includes a sector architecture in which the recording head (208) locates and identifies data sectors (254) without using data ID fields, but instead using information obtained from electronic storage (212,215) and from servo sectors (220) which need not be adjacent to the data sectors. The tracks contain servo information and data, but not data sector ID information. The tracks in each zone are circumferentially divided into segments. Included in each segment is a number of data regions separated from one another by servo sectors. The data regions may contain partial data sectors and complete data sectors. The format information provided to identify and locate data sectors, including ones whose region locations are not adjacent to servo sectors, includes an entry for each region in the section. Each entry includes the lengths of the first and last data sections in the region, whether the sectors represented by those sections are split between two regions, the total number of data sectors in the region, and the sector number of the first data sector in the region. The information provided in the servo sectors consists of a servo sector number or other indicia which enables the disk drive to determine the position of the recording head and begin reading or writing immediately upon settling on-track and without incurring a latency penalty.

    Abstract translation: 扇区伺服，区位记录盘驱动器包括扇区架构，其中记录头在不使用数据ID字段的情况下定位和识别数据扇区，而是使用从电子存储器获取的信息和不需要与数据扇区相邻的伺服扇区 。 轨道包含伺服信息和数据，但不包含数据扇区ID信息。 每个区域中的轨道沿周向分成段。 包括在每个段中的是通过伺服扇区彼此分离的多个数据区域。 数据区域可以包含部分数据扇区和完整的数据扇区。 提供用于识别和定位数据扇区的格式信息，包括其区域位置不与伺服扇区相邻的扇区，包括该区段中每个区域的条目。 每个条目包括该区域中的第一和最后数据段的长度，由这些部分表示的扇区是否在两个区域之间分割，该区域中的数据扇区的总数以及该区域中的第一数据扇区的扇区号 地区。 提供在伺服扇区中的信息包括伺服扇区号或其他标记，其使得磁盘驱动器能够确定记录头的位置，并且在轨道上稳定并立即开始读取或写入，并且不会引起延迟损失。

    Method and apparatus for recording data transitions
    10.
    发明授权
    Method and apparatus for recording data transitions 失效
    用于记录数据的转换方法和装置。

    公开(公告)号：EP0439278B1

    公开(公告)日：1995-03-29

    申请号：EP91300354.7

    申请日：1991-01-17

    Applicant: International Business Machines Corporation

    Inventor： Best, John Stewart ,  Hetzler, Steven Robert ,  Kabelac, William John ,  Thompson, David Allen

    IPC: G11B21/10 ,  G11B5/596 ,  G11B5/584

    CPC classification number: G11B20/1201 ,  G11B5/584 ,  G11B5/59633 ,  G11B21/10 ,  G11B2020/1255 ,  G11B2020/1282 ,  G11B2220/2508 ,  G11B2220/90

    Abstract: A method and means is described for writing data on a recording medium, such as a disk or tape, containing servo samples in such manner that the number of servo samples is increased with a minimal increase in overhead (non-data) regions. The tracks on the medium are divided into a plurality of maxi sections, each of which contains all fields with servo and associated overhead information and also a data field. At least one micro servo section containing only a portion of said information is located within each data field. As each micro servo section passes by an associated recording head, writing and reading of data is temporarily interrupted, but resumed when the micro servo section moves beyond the head, in such manner as to require minimal resynchronisation of said data during reading. Using a phase continuous clock, data is written in both portions of a data field to either side of each micro servo section in one pass of the disk or tape relative to the head. The micro servo sections contain no timing reference address mark and require no data encoder/decoder flush or synchronisation byte to resume reading in the portion of the data field following each micro servo section.

Patent Agency Ranking