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    31.
    发明专利
    未知

    公开(公告)号：DE69326267D1

    公开(公告)日：1999-10-14

    申请号：DE69326267

    申请日：1993-02-03

    Applicant: IBM

    Inventor： JAQUETTE GLEN ALAN ,  KULAKOWSKI JOHN EDWARD ,  MCDOWELL JUDSON ALLEN ,  MEANS RODNEY JEROME

    IPC: G11B7/004 ,  G11B7/00 ,  G11B7/0055 ,  G11B7/007 ,  G11B7/24 ,  G11B7/26 ,  G11B7/28 ,  G11B20/12 ,  G11B27/10

    Abstract: The present invention relates to a data storage device comprising a circular disc (30), a data storage medium on at least one surface of the disc, a spiral track extending within the storage medium about the axis of the disc, and a plurality of data storage sectors formed on the track. According to the invention the storage device is characterised in that the storage medium is formed with a reference mark (100) extending radially from the axis of the disc, and the data storage sectors are arranged in groups extending along the spiral track, one end of each group of sectors being located adjacent to one of the points of intersection of the reference mark with the spiral track.

    32.
    发明专利
    未知

    公开(公告)号：DE69224936D1

    公开(公告)日：1998-05-07

    申请号：DE69224936

    申请日：1992-06-16

    Applicant: IBM

    Inventor： CARDERO SILVIO ANTONIO ,  JAQUETTE GLEN ALAN

    IPC: G11B7/005 ,  G11B20/10 ,  G11B20/14 ,  G11B7/00

    Abstract: When optical disk recorder having readback circuits is used with pulse width modulated (PWM) signals a phase error of a clocking system with respect to the phase of a data signal is used to generate an amplitude detection threshold offset for servoing of the amplitude detection threshold by the phase error signals tending to increase the probability of faithful detection of data carried by the PWM or other signals.

    34.
    发明专利
    未知

    公开(公告)号：DE69119018D1

    公开(公告)日：1996-05-30

    申请号：DE69119018

    申请日：1991-09-26

    Applicant: IBM

    Inventor： JAQUETTE GLEN ALAN ,  JUSTO ROGER JAVIER

    IPC: G11B7/005 ,  G11B11/105 ,  G11B20/10 ,  G11B20/14 ,  G11B20/18 ,  G11B5/09

    Abstract: The present invention relates to apparatus for reading back data signals (60, 62) recorded on a recording medium comprising means for generating a string of data pulses (70, 71) representing the recorded data signals, means for determining the time of occurrence of each data pulse, comparison means for comparing the times of occurrence of successive timing pulses, and output means for generating a readback signal formed from a string of output pulses in accordance with the output of the comparison means. According to the invention is apparatus is characterised in that the output means comprises pulse modifying means for modifying any data pulse (67, 69) the leading edge of which occurs less than a predetermined time after the leading edge of the preceding data pulse (70).

    Generating a code alphabet of symbols to generate codewords for words used with a program
    36.
    发明专利
    Generating a code alphabet of symbols to generate codewords for words used with a program 未知

    公开(公告)号：GB2512533A

    公开(公告)日：2014-10-01

    申请号：GB201412083

    申请日：2012-12-19

    Applicant: IBM

    Inventor： CIDECIYAN ROY DARON ,  JAQUETTE GLEN ALAN ,  MITTELHOLZER THOMAS

    IPC: H03M7/40

    Abstract: Provided are a computer program product, system, and method for generating a code alphabet for use by a deployed program to determine codewords for words. A first code alphabet is generated having a first number of symbols that provide variable length codings of the words. The symbols in the first code alphabet are merged into a second number of groups of the symbols in the first code alphabet, where the second number is less than the first number. A second code alphabet is generated having the second number of symbols, wherein a second average codeword length of the codewords produced using the symbols in the second code alphabet is smaller than the codeword length (b) of the words, and wherein the second code alphabet comprises the code alphabet used by the deployed program.

    37.
    发明专利
    未知

    公开(公告)号：AT516582T

    公开(公告)日：2011-07-15

    申请号：AT00303870

    申请日：2000-05-09

    Applicant: IBM

    Inventor： BUI NHAN XUAN ,  FUKUDA JUNICHI ,  JAQUETTE GLEN ALAN ,  KOSKI JOHN ALEXANDER ,  TSURUTA KAZUHIRO

    IPC: G11B21/10 ,  G11B5/008 ,  G11B5/584 ,  G11B20/10 ,  G11B20/12 ,  G11B27/13

    Abstract: Disclosed are a method and a detector for adaptively detecting servo gaps in a timing based servo pattern (50) prerecorded on a variable velocity media. The timing based servo pattern has groups of repeated pairs of non-parallel transition stripes arranged in bursts (52,54,55), the bursts separated by servo gaps whose (70-75) length is variable. A servo system sensor (26) senses the transition stripes in the longitudinal direction of the media. A group interval detector coupled to the sensor detects the timing interval between the same slope transition stripes of two sequential groups of bursts (BX,BY). A divider (170) divides the detected group timing interval by a predetermined divisor to provide a divided timing interval gap detection threshold (181). A sequential stripe interval detector coupled to the sensor measures the timing interval between stripes, and a comparator (110) compares the divided timing interval and the timing interval, identifying a servo gap upon the measured timing interval at least equaling the gap threshold. The detector responds to "valid" signals (BXOK,BYOK) which indicate the validity of the detected group timing interval, repeating operation of the divider to update the gap threshold, and repeating operation of the comparator with the updated gap threshold to continue to identify the servo gaps.

    38.
    发明专利
    未知

    公开(公告)号：DE69718716T2

    公开(公告)日：2003-09-18

    申请号：DE69718716

    申请日：1997-06-11

    Applicant: IBM

    Inventor： CLARK ALAN ROBERT ,  HUTCHINS ROBERT ALLEN ,  JAQUETTE GLEN ALAN

    IPC: G01M11/00 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/09 ,  G11B7/125 ,  G11B11/10 ,  G11B11/105 ,  G11B20/10 ,  G11B20/18 ,  G11B27/36

    Abstract: An calibration apparatus operates in multiple calibration modes of a multi-mode information storage system such as an optical disk drive to calibrate the drive in the multiple write modes. An event processing and measurement circuit is configurable in multiple configurations that each correspond to a different calibration measurement. Each configuration concurrently measures one or more parameters of readback data written to an optical disk by the optical disk drive operating in a particular write mode. A qualification circuit selects valid measurements for two different parameters or for two different qualification of the same parameter. A summation circuit sums valid measurements of each parameter measured and counts the number of measurements summed for each parameter. The calibration apparatus calculates average values for the measured parameters from the sums and counts, and then calibrates the multi-mode optical disk drive for its current write mode based on the average values.

    39.
    发明专利
    未知

    公开(公告)号：AT245847T

    公开(公告)日：2003-08-15

    申请号：AT00927599

    申请日：2000-05-18

    Applicant: IBM

    Inventor： BUI NHAN XUAN ,  JAQUETTE GLEN ALAN ,  KOSKI JOHN ALEXANDER ,  TSURUTA KAZUHIRO

    IPC: G11B27/28 ,  G11B27/10 ,  G11B27/32 ,  G11B27/36 ,  G11B15/087

    Abstract: A system and method for precisely registering and synchronizing data sets on a recording media having a prerecorded servo pattern. The recording media is subject to continuing movement for reading and/or writing the data sets, interrupted by stopping at the end of a selected data set and restarting. During the continuing movement of the recording media, a detector coupled to the servo system continuously reads linear position registration data modulated into the prerecorded servo pattern. An interpolator interpolates the prerecorded registration data to provide precision registration information for the data sets. Upon the drive stopping the recording media, then back hitching the media and the movement restarting, selected read and interpolated registration information is provided. The detector again reads and interpolates the prerecorded registration data, and a comparator compares the again read and interpolated registration information to the provided read and interpolated registration information and any predetermined offset, and indicates a comparison match. A data formatter coupled to the comparator, responsive to the comparison match indication, synchronizes the reading and/or writing of data sets on the recording media.

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