TWI350527B - Method of detecting data in a sample sequence read from a recording channel - Google Patents

Method of detecting data in a sample sequence read from a recording channel

Info

Publication number
TWI350527B
TWI350527B TW093112796A TW93112796A TWI350527B TW I350527 B TWI350527 B TW I350527B TW 093112796 A TW093112796 A TW 093112796A TW 93112796 A TW93112796 A TW 93112796A TW I350527 B TWI350527 B TW I350527B
Authority
TW
Taiwan
Prior art keywords
sample sequence
sequence read
detecting data
recording channel
recording
Prior art date
Application number
TW093112796A
Other languages
English (en)
Other versions
TW200502930A (en
Inventor
Viswanath Annampedu
Pervez M Aziz
Original Assignee
Agere Systems Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Agere Systems Inc filed Critical Agere Systems Inc
Publication of TW200502930A publication Critical patent/TW200502930A/zh
Application granted granted Critical
Publication of TWI350527B publication Critical patent/TWI350527B/zh

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
    • G11B20/10055—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using partial response filtering when writing the signal to the medium or reading it therefrom
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10268—Improvement or modification of read or write signals bit detection or demodulation methods
    • G11B20/10287—Improvement or modification of read or write signals bit detection or demodulation methods using probabilistic methods, e.g. maximum likelihood detectors
    • G11B20/10296—Improvement or modification of read or write signals bit detection or demodulation methods using probabilistic methods, e.g. maximum likelihood detectors using the Viterbi algorithm
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03184—Details concerning the metric
    • H04L25/03191—Details concerning the metric in which the receiver makes a selection between different metrics
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
    • G11B5/59627—Aligning for runout, eccentricity or offset compensation

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Power Engineering (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)
  • Error Detection And Correction (AREA)
TW093112796A 2003-05-13 2004-05-06 Method of detecting data in a sample sequence read from a recording channel TWI350527B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10/436,526 US6912099B2 (en) 2003-05-13 2003-05-13 Maximum likelihood detection of asynchronous servo data employing interpolation

Publications (2)

Publication Number Publication Date
TW200502930A TW200502930A (en) 2005-01-16
TWI350527B true TWI350527B (en) 2011-10-11

Family

ID=32094197

Family Applications (1)

Application Number Title Priority Date Filing Date
TW093112796A TWI350527B (en) 2003-05-13 2004-05-06 Method of detecting data in a sample sequence read from a recording channel

Country Status (5)

Country Link
US (1) US6912099B2 (zh)
JP (1) JP4602694B2 (zh)
KR (1) KR101034771B1 (zh)
GB (2) GB2401761B (zh)
TW (1) TWI350527B (zh)

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US7193801B2 (en) * 2004-11-18 2007-03-20 Agere Systems, Inc. Method and apparatus for testing a servo circuit of a read/write head system
US7193798B2 (en) * 2005-01-12 2007-03-20 Agere Systems, Inc. Method and apparatus for encoding and decoding a runout correction bit pattern of servo field
US7738202B1 (en) * 2005-10-07 2010-06-15 Seagate Technology, Llc Wide-biphase-detector quality monitor for sensing of pin layer reversal
US7580212B1 (en) * 2006-03-30 2009-08-25 Western Digital Technologies, Inc. Magnetic disk having efficiently stored WRRO compensation value redundancy information and method for using the redundancy information
US7738200B2 (en) * 2006-05-01 2010-06-15 Agere Systems Inc. Systems and methods for estimating time corresponding to peak signal amplitude
US7499238B2 (en) * 2006-09-22 2009-03-03 Agere Systems Inc. Systems and methods for improving disk drive synchronization
US8054931B2 (en) * 2007-08-20 2011-11-08 Agere Systems Inc. Systems and methods for improved timing recovery
US8254049B2 (en) * 2007-08-20 2012-08-28 Agere Systems Inc. Systems and methods for improved synchronization between an asynchronously detected signal and a synchronous operation
WO2009058130A1 (en) * 2007-10-30 2009-05-07 Agere Systems Inc. Systems and methods for inter-location control of storage access
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JP5036877B2 (ja) * 2007-12-14 2012-09-26 エルエスアイ コーポレーション サーボデータを用いたフライングハイト制御のためのシステム及び方法
US7768437B2 (en) * 2008-04-29 2010-08-03 Agere Systems Inc. Systems and methods for reducing the effects of ADC mismatch
US7813065B2 (en) * 2008-04-29 2010-10-12 Agere Systems Inc. Systems and methods for acquiring modified rate burst demodulation in servo systems
US7929237B2 (en) * 2008-06-27 2011-04-19 Agere Systems Inc. Modulated disk lock clock and methods for using such
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US7982990B1 (en) * 2008-09-08 2011-07-19 Marvell International Ltd. Digital techniques to decode signals extracted from computer-readable storage media
US8976913B2 (en) * 2008-09-17 2015-03-10 Lsi Corporation Adaptive pattern dependent noise prediction on a feed forward noise estimate
US8243381B2 (en) 2008-11-13 2012-08-14 Agere Systems Inc. Systems and methods for sector address mark detection
US9305581B2 (en) * 2008-12-04 2016-04-05 Avago Technologies General Ip (Singapore) Pte. Ltd. Systems and methods for memory efficient repeatable run out processing
US8154972B2 (en) 2009-06-24 2012-04-10 Lsi Corporation Systems and methods for hard disk drive data storage including reduced latency loop recovery
US8174949B2 (en) * 2009-07-02 2012-05-08 Lsi Corporation Systems and methods for format efficient timing recovery in a read channel
CN101964654A (zh) 2009-07-22 2011-02-02 Lsi公司 用于高阶非对称性校正的系统和方法
US8456775B2 (en) * 2009-12-31 2013-06-04 Lsi Corporation Systems and methods for detecting a reference pattern
US8566381B2 (en) * 2010-08-05 2013-10-22 Lsi Corporation Systems and methods for sequence detection in data processing
US8237597B2 (en) 2010-09-21 2012-08-07 Lsi Corporation Systems and methods for semi-independent loop processing
US8566378B2 (en) 2010-09-30 2013-10-22 Lsi Corporation Systems and methods for retry sync mark detection
US8614858B2 (en) 2010-11-15 2013-12-24 Lsi Corporation Systems and methods for sync mark detection metric computation
US8526131B2 (en) 2010-11-29 2013-09-03 Lsi Corporation Systems and methods for signal polarity determination
US8498072B2 (en) 2010-11-29 2013-07-30 Lsi Corporation Systems and methods for spiral waveform detection
US8411385B2 (en) 2010-12-20 2013-04-02 Lsi Corporation Systems and methods for improved timing recovery
US8325433B2 (en) 2011-01-19 2012-12-04 Lsi Corporation Systems and methods for reduced format data processing
US8261171B2 (en) 2011-01-27 2012-09-04 Lsi Corporation Systems and methods for diversity combined data detection
US8749908B2 (en) 2011-03-17 2014-06-10 Lsi Corporation Systems and methods for sync mark detection
US8565047B2 (en) 2011-04-28 2013-10-22 Lsi Corporation Systems and methods for data write loopback based timing control
US8665544B2 (en) 2011-05-03 2014-03-04 Lsi Corporation Systems and methods for servo data detection
US8874410B2 (en) 2011-05-23 2014-10-28 Lsi Corporation Systems and methods for pattern detection
US8498071B2 (en) 2011-06-30 2013-07-30 Lsi Corporation Systems and methods for inter-track alignment
US8669891B2 (en) 2011-07-19 2014-03-11 Lsi Corporation Systems and methods for ADC based timing and gain control
US8780476B2 (en) 2011-09-23 2014-07-15 Lsi Corporation Systems and methods for controlled wedge spacing in a storage device
US8699160B2 (en) * 2011-10-26 2014-04-15 Lsi Corporation Methods and apparatus for validating detection of RRO address marks
US8773811B2 (en) 2011-12-12 2014-07-08 Lsi Corporation Systems and methods for zone servo timing gain recovery
US8625216B2 (en) 2012-06-07 2014-01-07 Lsi Corporation Servo zone detector
US8681444B2 (en) 2012-06-07 2014-03-25 Lsi Corporation Multi-zone servo processor
US8564897B1 (en) 2012-06-21 2013-10-22 Lsi Corporation Systems and methods for enhanced sync mark detection
US9019641B2 (en) 2012-12-13 2015-04-28 Lsi Corporation Systems and methods for adaptive threshold pattern detection
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Also Published As

Publication number Publication date
GB0405016D0 (en) 2004-04-07
GB0521639D0 (en) 2005-11-30
GB2401761A (en) 2004-11-17
JP4602694B2 (ja) 2010-12-22
JP2004342300A (ja) 2004-12-02
GB2401761B (en) 2006-03-22
TW200502930A (en) 2005-01-16
US6912099B2 (en) 2005-06-28
US20040228019A1 (en) 2004-11-18
KR101034771B1 (ko) 2011-05-17
KR20040098555A (ko) 2004-11-20

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Legal Events

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MM4A Annulment or lapse of patent due to non-payment of fees