公开(公告)号：GB2512533B

公开(公告)日：2015-07-08

申请号：GB201412083

申请日：2012-12-19

Applicant: IBM

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

IPC: H03M7/40

公开(公告)号：DE112012005557T5

公开(公告)日：2014-11-06

申请号：DE112012005557

申请日：2012-12-19

Applicant: IBM

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

IPC: H03M7/30

Abstract: Bereitgestellt werden ein Computerprogrammprodukt, ein System und ein Verfahren zum Erzeugen eines Code-Alphabets zur Verwendung durch ein genutztes Programm zum Bestimmen von Codewörtern für Wörter. Ein erstes Code-Alphabet wird erzeugt, das eine erste Anzahl von Symbolen hat, die Codierungen von variabler Länge der Wörter bereitstellen. Die Symbole in dem ersten Code-Alphabet werden in eine zweite Anzahl von Gruppen der Symbole in dem ersten Code-Alphabet zusammengeführt, wobei die zweite Anzahl kleiner als die erste Anzahl ist. Ein zweites Code-Alphabet wird erzeugt, das die zweite Anzahl von Symbolen aufweist, wobei eine zweite durchschnittliche Codewortlänge der Codewörter, die unter Verwendung der Symbole in dem zweiten Code-Alphabet erzeugt wurden, kleiner ist als die Codewortlänge (b) der Wörter, und wobei das zweite Code-Alphabet das Code-Alphabet aufweist, das von dem genutzten Programm verwendet wird.

公开(公告)号：DE602006009123D1

公开(公告)日：2009-10-22

申请号：DE602006009123

申请日：2006-07-03

Applicant: IBM

Inventor： ELEFTHERIOU EVANGELOS ,  OELCER SEDAT ,  JAQUETTE GLEN ALAN ,  JELITTO JENS ,  HUTCHINS ROBERT ALLAN

IPC: G11B20/10 ,  H04L25/03

Abstract: A read channel and method using that read channel are disclosed. The read channel comprises an analog to digital converter which asynchronously samples at a fixed rate an analog signal formed by reading a data track, where that data track was written to a data storage medium at a symbol rate and an interpolator interconnected with the analog to digital converter. The read channel further comprises a fractionally-spaced equalizer, where the interpolator provides an interpolated signal to the fractionally-spaced equalizer at an interpolation rate, where that interpolation rate is greater than the symbol rate. The fractionally-spaced equalizer forms a synchronous equalized signal. The read channel further comprises a gain control module interconnected with the fractionally-spaced equalizer, and a sequence detector interconnected with the gain control module.

公开(公告)号：DE69829020T2

公开(公告)日：2006-06-01

申请号：DE69829020

申请日：1998-07-02

Applicant: IBM

Inventor： ALBRECHT THOMAS ROBERT ,  JAQUETTE GLEN ALAN

IPC: G11B21/10 ,  G11B5/55 ,  G11B5/584 ,  G11B15/60 ,  G11B20/14 ,  G11B21/08 ,  G11B27/30

公开(公告)号：MY117516A

公开(公告)日：2004-07-31

申请号：MYPI20001979

申请日：2000-05-08

Applicant: IBM

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

IPC: G11B5/584 ,  G11B5/008 ,  G11B5/55 ,  G11B20/10 ,  G11B20/12 ,  G11B21/10 ,  G11B27/13

Abstract: DISCLOHSED ARE A METHOD AND A DETECTOR FOR ADAPTIVELY DETECTING SERVO GAPS IN A TIMING BASED SERVO PATTERN PRERECORDED ON A VARIABLE MEDIA.THE TIMING BASED SERVO PATTERN HAS GROUPS OF REPEATED PAIRS OF NON-PARALLEL TRANSITION STRIPES ARRANGED IN BURST, THE BURST SEPARATES BY SERVO GAPS WHOSE LENGTH IS VARIABLE. ASERVO SYSTEM SENSOR SENSE THE TRANSITION STRIPES IN THE LONGITUDINAL DIRECTION OF THE MEDIA. AGROUP INTERVAL DETECTOR COUPLED TO THE SENSOR DETECTS THE TIMING INTERVAL BETWEEN THE SAME SLOPE TRANSITION STRIPES OF TWO SEQUENTIAL GROUPS OF BURST. A DIVIDER DIVIDES THE DETECTED GROUP TIMING INTERVAL BY A PREDETERMINED DIVISOR TO PROVIDE A DIVIDED TIMING INTERVAL GAP DETECTION THRESHOLD .A SEQUENTIAL STRIP INTERVAL DETECTOR COUPLED TO THE SENSOR MEASURES THE TIMING INTERVAL BETWEEN STRIPES, AND A COMPARATOR 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 WHICH INDICATE THE VALIDITY OF THE DETECTED GROUP TIMING INTERVAL, REPEATION OPERATION OF THE DIVIDER TO UPDATE THE GAP THRESHOLD , REPEATING OPERATION OF THE COMPARATOR WITH THE UPDATED GAP THRESHOLD TO CONTINUE TO IDENTIFY THE SERVO GAPS.

公开(公告)号：HU0201447A2

公开(公告)日：2002-08-28

申请号：HU0201447

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

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.

公开(公告)号：CZ20014146A3

公开(公告)日：2002-02-13

申请号：CZ20014146

申请日：2000-05-18

Applicant: IBM

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

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

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.

公开(公告)号：DE69326267T2

公开(公告)日：2000-04-20

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.

公开(公告)号：DE69502234D1

公开(公告)日：1998-06-04

申请号：DE69502234

申请日：1995-05-26

Applicant: IBM

Inventor： CALL DAVID ERNEST ,  FINKELSTEIN BLAIR IAN ,  JAQUETTE GLEN ALAN

IPC: G11B7/00 ,  G11B7/0045 ,  G11B7/125

Abstract: A write-once optical disk data recorder automatically calibrates a laser during a write data operation and using write pulses focussed to a disk. First, the laser is calibrated using a non-focussed laser beam. Each sector of the disk has a laser checking or test area, such as an automatic laser power correction field (ALPC) of two byte lineal extent. During a first write operation after a power up or disk load, a pulse width modulated (PWM) laser test signal is recorded using a laser power level set using the non-focussed laser beam and an indicated desired recording power level on the disk. The recorded laser test signal is read back. The length of the read back laser test signal is measured. The measured length is then compared with a desired length of the PWM laser test signal that indicates a desired laser power level. That is, as laser recording power levels increase, a resultant recorded signal grows in size. This property is used to measure laser power for calibrating laser operation.

公开(公告)号：CA2064633C

公开(公告)日：1997-05-13

申请号：CA2064633

申请日：1992-04-01

Applicant: IBM

Inventor： CARDERO SILVIO ANTONIO ,  JAQUETTE GLEN ALAN

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

Abstract: When an 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.