TW200515697A - Adaptive equalizer - Google Patents

Adaptive equalizer

Info

Publication number
TW200515697A
TW200515697A TW093132059A TW93132059A TW200515697A TW 200515697 A TW200515697 A TW 200515697A TW 093132059 A TW093132059 A TW 093132059A TW 93132059 A TW93132059 A TW 93132059A TW 200515697 A TW200515697 A TW 200515697A
Authority
TW
Taiwan
Prior art keywords
filter
adaptive
filter coefficients
coefficient
normal operation
Prior art date
Application number
TW093132059A
Other languages
English (en)
Other versions
TWI291286B (en
Inventor
Orimitsu Serizawa
Original Assignee
Sanyo Electric Co
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 Sanyo Electric Co filed Critical Sanyo Electric Co
Publication of TW200515697A publication Critical patent/TW200515697A/zh
Application granted granted Critical
Publication of TWI291286B publication Critical patent/TWI291286B/zh

Links

Classifications

    • 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
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/027—Analogue recording
    • G11B5/035—Equalising

Landscapes

  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Digital Magnetic Recording (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
TW093132059A 2003-10-31 2004-10-21 Adaptive equalizer TWI291286B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003373606A JP2005135563A (ja) 2003-10-31 2003-10-31 適応等化器

Publications (2)

Publication Number Publication Date
TW200515697A true TW200515697A (en) 2005-05-01
TWI291286B TWI291286B (en) 2007-12-11

Family

ID=34616069

Family Applications (1)

Application Number Title Priority Date Filing Date
TW093132059A TWI291286B (en) 2003-10-31 2004-10-21 Adaptive equalizer

Country Status (5)

Country Link
US (1) US7256954B2 (zh)
JP (1) JP2005135563A (zh)
KR (1) KR100654269B1 (zh)
CN (1) CN1294732C (zh)
TW (1) TWI291286B (zh)

Families Citing this family (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050213748A1 (en) * 2004-02-11 2005-09-29 Rtx Telecom A/S Line extender for high speed modem data transfer
US7298570B1 (en) 2004-10-27 2007-11-20 Marvell International Ltd. Asymmetry correction in read signal
US7511910B1 (en) * 2004-10-27 2009-03-31 Marvell International Ltd. Asymmetry correction in read signal
US7271971B2 (en) * 2004-12-03 2007-09-18 International Business Machines Corporation Dynamically adapting a magnetic tape read channel equalizer
US7457355B2 (en) * 2005-05-25 2008-11-25 International Business Machines Corporation Method for an equalizer computation in a media system using a data set separator sequence
US7236319B2 (en) * 2005-06-08 2007-06-26 Fujifilm Corporation Reproducing method, reproducing apparatus, recording and reproducing apparatus, and magnetic recording medium
US7589927B2 (en) * 2005-08-30 2009-09-15 International Business Machines Corporation Dynamically adapting a read channel equalizer
JP2007294011A (ja) * 2006-04-25 2007-11-08 Hitachi Global Storage Technologies Netherlands Bv ディスク・ドライブ装置
US7801209B2 (en) 2006-07-14 2010-09-21 Samsung Electronics Co., Ltd. Variable tap length equalizers and related digital receivers, methods and computer program products
US7787533B2 (en) * 2007-01-03 2010-08-31 Lockheed Martin Corporation Alternative method for equalizing DDS generated waveforms
US7864477B1 (en) * 2007-08-13 2011-01-04 Marvell International Ltd. Circuits, architectures, apparatuses, systems, algorithms and methods and software for automatic gain calibration of a burst signal stream
US7924523B2 (en) * 2007-12-21 2011-04-12 Lsi Corporation Frequency domain approach for efficient computation of fixed-point equalization targets
KR101500024B1 (ko) 2007-12-21 2015-03-06 엘에스아이 코포레이션 기록 채널들에서의 적응 이퀄라이징을 위한 시스템 및 방법들
US7948703B1 (en) * 2008-01-30 2011-05-24 Marvell International Ltd. Adaptive target optimization methods and systems for noise whitening based viterbi detectors
CN101599929B (zh) * 2008-06-06 2012-11-21 富士通株式会社 自适应均衡装置和方法
US7924518B2 (en) * 2008-08-27 2011-04-12 Lsi Corporation Systems and methods for adaptive write pre-compensation
US9281908B2 (en) * 2008-10-08 2016-03-08 Avago Technologies General Ip (Singapore) Pte. Ltd. Systems and methods for memory efficient signal and noise estimation
US7965467B2 (en) * 2008-12-18 2011-06-21 Lsi Corporation Systems and methods for generating equalization data
US7929240B2 (en) 2008-12-18 2011-04-19 Lsi Corporation Systems and methods for adaptive MRA compensation
US8154815B2 (en) * 2008-12-18 2012-04-10 Lsi Corporation Systems and methods for generating equalization data using shift register architecture
US7948702B2 (en) * 2008-12-18 2011-05-24 Lsi Corporation Systems and methods for controlling data equalization
US7974030B2 (en) 2008-12-23 2011-07-05 Lsi Corporation Systems and methods for dibit correction
JP2010152951A (ja) * 2008-12-24 2010-07-08 Toshiba Corp 光ディスク駆動装置
US7948699B2 (en) * 2009-01-02 2011-05-24 Lsi Corporation Systems and methods for equalizer optimization in a storage access retry
JP2012514935A (ja) * 2009-01-09 2012-06-28 エルエスアイ コーポレーション 適応ターゲット探索のためのシステム及び方法
US7957251B2 (en) 2009-02-16 2011-06-07 Agere Systems Inc. Systems and methods for reduced latency loop recovery
US7969337B2 (en) * 2009-07-27 2011-06-28 Lsi Corporation Systems and methods for two tier sampling correction in a data processing circuit
US8139305B2 (en) * 2009-09-14 2012-03-20 Lsi Corporation Systems and methods for timing and gain acquisition
US8422609B2 (en) * 2009-09-30 2013-04-16 Lsi Corporation Automatic filter-reset mechanism
US8854752B2 (en) 2011-05-03 2014-10-07 Lsi Corporation Systems and methods for track width determination
US8762440B2 (en) 2011-07-11 2014-06-24 Lsi Corporation Systems and methods for area efficient noise predictive filter calibration
US9112538B2 (en) 2013-03-13 2015-08-18 Avago Technologies General Ip (Singapore) Pte. Ltd. Systems and methods for loop feedback
US8848776B1 (en) 2013-03-25 2014-09-30 Lsi Corporation Systems and methods for multi-dimensional signal equalization
US8929010B1 (en) 2013-08-21 2015-01-06 Lsi Corporation Systems and methods for loop pulse estimation
US10014026B1 (en) 2017-06-20 2018-07-03 Seagate Technology Llc Head delay calibration and tracking in MSMR systems
US11018842B1 (en) 2018-07-31 2021-05-25 Seagate Technology Llc Dynamic timing recovery bandwidth modulation for phase offset mitigation
US11016681B1 (en) 2018-07-31 2021-05-25 Seagate Technology Llc Multi-threshold parameter adaptation
US10522177B1 (en) 2018-07-31 2019-12-31 Seagate Technology Llc Disc locked clock-based servo timing
US10803902B1 (en) 2018-08-19 2020-10-13 Seagate Technology Llc Hardware-based read sample averaging
US10460762B1 (en) 2018-09-04 2019-10-29 Seagate Technology Llc Cancelling adjacent track interference signal with different data rate
US10468060B1 (en) 2018-09-27 2019-11-05 Seagate Technology Llc Cancelling adjacent track interference

Family Cites Families (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4707841A (en) * 1984-08-21 1987-11-17 University Of Toronto, Innovations Foundation Digital data receiver for preamble free data transmission
JPH04259111A (ja) * 1991-02-13 1992-09-14 Oki Electric Ind Co Ltd 適応等化器
EP0527017B1 (en) * 1991-08-03 1997-03-26 Sony Corporation Magnetic reproducing apparatus
JP3013536B2 (ja) 1991-08-03 2000-02-28 ソニー株式会社 磁気再生装置
JP3013535B2 (ja) * 1991-08-03 2000-02-28 ソニー株式会社 磁気再生装置
JP3104333B2 (ja) * 1991-10-08 2000-10-30 ソニー株式会社 磁気再生装置
US5369667A (en) * 1991-10-16 1994-11-29 Sony Corporation Apparatus and method for automatically adjusting parameters of an automatic equalizer
JP3371256B2 (ja) * 1991-10-31 2003-01-27 日本電気エンジニアリング株式会社 自動等化器
US5341249A (en) * 1992-08-27 1994-08-23 Quantum Corporation Disk drive using PRML class IV sampling data detection with digital adaptive equalization
JPH06252699A (ja) * 1993-03-01 1994-09-09 Sony Corp 時分割多重化処理方式における自動等化器
JP3456781B2 (ja) * 1995-02-06 2003-10-14 富士通株式会社 磁気記録再生装置の復調回路
US5999355A (en) * 1996-04-30 1999-12-07 Cirrus Logic, Inc. Gain and phase constrained adaptive equalizing filter in a sampled amplitude read channel for magnetic recording
EP0831478B1 (en) * 1996-09-24 2003-11-19 Hewlett-Packard Company, A Delaware Corporation Data processing apparatus and methods
JP3335862B2 (ja) * 1997-01-28 2002-10-21 シャープ株式会社 波形等化器及びこれを備えたディジタル記録再生装置
KR100224837B1 (ko) * 1997-02-21 1999-10-15 윤종용 디지털 vcr의 적응적인 신호 처리방법 및 그 회로
KR100244767B1 (ko) * 1997-06-25 2000-02-15 전주범 디지탈 자기 기록/재생 시스템의 선택적 동기/비동기 부분 응답 채널 데이터 검출 장치
US7012772B1 (en) * 1998-09-02 2006-03-14 Cirrus Logic, Inc. Sampled amplitude read channel employing an adaptive non-linear correction circuit for correcting non-linear distortions in a read signal
JP3514638B2 (ja) * 1998-09-28 2004-03-31 株式会社日立製作所 環境変動耐力の高い磁気ディスク装置
US6449110B1 (en) * 1999-02-03 2002-09-10 Cirrus Logic, Inc. Optimizing operation of a disk storage system by increasing the gain of a non-linear transducer and correcting the non-linear distortions using a non-linear correction circuit
JP3811319B2 (ja) * 1999-08-05 2006-08-16 松下電器産業株式会社 信号再生装置
FI108265B (fi) * 2000-02-21 2001-12-14 Tellabs Oy Menetelmä ja laitteisto adaptiivisen kanavakorjauksen opetusvaiheen toteuttamiseksi digitaalisella tietoliikenneyhteydellä
JP3928332B2 (ja) * 2000-05-11 2007-06-13 株式会社日立製作所 適応等化回路
US6836456B2 (en) * 2000-07-27 2004-12-28 Victor Company Of Japan, Ltd. Information reproducing apparatus
JP2002230902A (ja) * 2001-01-29 2002-08-16 Sony Corp 適応型等化回路及びそれを用いた再生装置
US6993673B2 (en) * 2001-12-17 2006-01-31 Mysticom Ltd. Apparatus for frequency and timing recovery in a communication device
EP1414036A4 (en) * 2002-05-28 2008-01-16 Sony Corp SIGNAL PROCESSING APPARATUS AND METHOD, AND REPRODUCTION DEVICE FOR DIGITAL DATA
JP4261334B2 (ja) * 2003-12-26 2009-04-30 株式会社東芝 ディスク装置及びディスク再生方法

Also Published As

Publication number Publication date
KR20050041946A (ko) 2005-05-04
US7256954B2 (en) 2007-08-14
CN1294732C (zh) 2007-01-10
JP2005135563A (ja) 2005-05-26
US20050117243A1 (en) 2005-06-02
TWI291286B (en) 2007-12-11
KR100654269B1 (ko) 2006-12-08
CN1612215A (zh) 2005-05-04

Similar Documents

Publication Publication Date Title
TW200515697A (en) Adaptive equalizer
WO2007059517A3 (en) Equalizer for a receiver in a wireless communication system
IL165072A0 (en) Rechiver with selection between a decision feedback equalizer and a linear equalizer
EP1585279A3 (en) Receiver circuit comprising equalizer
DE60311348D1 (de) Errechnung der Koeffizienten für einen entscheidungsrückgekoppelten Entzerrer änderbarer Verzögerung
HK1098267A1 (en) Channel estimation by adaptive interpolation
EP1733474A4 (en) ADAPTIVE EQUALIZATION METHOD AND CIRCUIT FOR MULTIPLE SIGNALS IN RESPONSE TO A CONTROL SIGNAL GENERATED FROM ONE OF THE EQUALIZED SIGNALS
WO2005101655A8 (en) Advanced digital receiver
WO2004059899A3 (en) Adaptive coefficient signal generator for adaptive signal equalizers with fractionally-spaced feedback
JP5487996B2 (ja) 適応等化器および適応等化方法
WO2011017256A3 (en) Equalization for ofdm communication
AU2003262410A1 (en) Decision feedback equalizer
AU2003297378A1 (en) Decision feedback equalizer
TW200729857A (en) Data communication circuit with equalization control
WO2012030606A3 (en) Adaptation circuitry and methods for decision feedback equalizers
MX2008002718A (es) Ecualizador de canal, metodo de ecualizacion de canal, y metodo de actualizacion del indice de derivacion.
AU2001236865A1 (en) Delayed decision feedback log-map equalizer
DE602006013613D1 (de) Verfahren zur reduzierung der durch verzögerte Reflexion zwischen Symbolen entstehenden Interferenzen
MY139596A (en) Cdma pilot assisted channel estimation
EP1820282A4 (en) LOW COMPLEXITY ADAPTIVE TRACK ESTIMATION
DE60205650T2 (de) Zf-basierter adaptiver asynchroner empfänger
WO2008126217A1 (ja) 歪補正制御装置及び歪補正制御方法
WO2009117441A3 (en) Single-carrier and ofdm block transmission structure for parallel decision feedback equalization and tracking
ATE449475T1 (de) Empfänger eines optischen signals
WO2005072331A3 (en) Equalized signal path with predictive subtraction signal

Legal Events

Date Code Title Description
MM4A Annulment or lapse of patent due to non-payment of fees