JP2000513182A - ノイズ予測最尤検出の装置および方法 - Google Patents
ノイズ予測最尤検出の装置および方法Info
- Publication number
- JP2000513182A JP2000513182A JP10548960A JP54896098A JP2000513182A JP 2000513182 A JP2000513182 A JP 2000513182A JP 10548960 A JP10548960 A JP 10548960A JP 54896098 A JP54896098 A JP 54896098A JP 2000513182 A JP2000513182 A JP 2000513182A
- Authority
- JP
- Japan
- Prior art keywords
- noise
- detector
- impulse response
- infinite impulse
- maximum likelihood
- Prior art date
- Legal status (The legal status 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 status listed.)
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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
- 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
- G11B20/10175—PR4, PR(1,0,-1), i.e. partial response class 4, polynomial (1+D)(1-D)=(1-D2)
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Algebra (AREA)
- Pure & Applied Mathematics (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Error Detection And Correction (AREA)
Abstract
Description
Claims (1)
- 【特許請求の範囲】 1.ノイズ予測を伴う最尤シーケンス検出のための手段(10)を含む、部分応 答等化器を通過したコード化されたデータ・シーケンスおよびコード化されてい ないデータ・シーケンスの検出器であって、 最尤シーケンス検出手段に組み込まれた無限インパルス応答(IIR)ノイズ 予測子(35、45)を含むことを特徴とする検出器。 2.前記無限インパルス応答ノイズ予測子(35)が、変換関数αD/(1−α D)を実行し、αが事前に選択した倍率、Dが単位遅延演算子である、請求項1 に記載の検出器。 3.前記無限インパルス応答ノイズ予測子(45)が、変換関数 [−(α1+β1)D−(α2+β2)D2]/[(1+α1D+α2D2)]を実行し 、α1、α2、β1、およびβ2が事前に選択した倍率、Dが単位遅延演算子である 、請求項1に記載の検出器。 4.前記無限インパルス応答ノイズ予測子(35)が、 の単位遅延手段の出力と第2の単位遅延手段(43)の出力 (41)の出力に定数因数(α)をかけ、予測ノイズ・サン 含む単極フィルタであり、第2の単位遅延手段(43)がその入力で前記予測ノ イズ・サンプルを受信する、請求項2に記載の検出器。 5.前記無限インパルス応答ノイズ予測子(45)が、よび第2の単位遅延手段(47、48)と、前記第2の遅延手段の出力に第1の 定数因数[−(α2+β2)]をかける第1の乗算手段(49)と、前記第1の乗 算手段の出力と、そのさらに別の入力(51、52、53)に現れる補正項を加 に与える加算手段(50)と、前記加算手段の出力に直列に接続された第3およ び第4の単位遅延手段(55、57)と、前記第1(47)、第3(55)、お よび第4(57)の単位遅延手段の各出力に、それぞれの定数因数([−(α1 +β1)];[−α1];[−α2])をかけ、前記加算手段(50)の前記のさ らに別の入力(51、52、53)にそれらの出力を与える第2、第3、および 第4の乗算手段(5 4、56、58)と を含む2極かつ2ゼロのフィルタである、請求項3に記載の検出器。 前記無限インパルス応答ノイズ予測子(35;45)の入力(28;28a)に 与えるようになされ、 前記減算手段(46)が、再構築されたPR4サンプル れたノイズ・データ・サンプル(yn)のための第2の入力(38)を有し、ま たノイズ・データ・サンプルおよび再構 は5に記載の検出器。 7.変換関数(1−D2)によってPR4データ・サンプル この再構築手段の入力がビタビ検出器(31)のパス履歴に 9)が減算手段(46)の第1の入力(29)に接続される、請求項6に記載の 検出器。 8.前記無限インパルス応答ノイズ予測子(35;45)のフィルタ機能が、2 つ以下の極および2つ以下のゼロを有する、請求項1に記載の検出器。 9.無限インパルス応答ノイズ予測子(35;45)を含む最尤検出手段(10 )に組み込まれた、またはこれとカスケ ード接続された、DCオフセットを補償するためのDCノッチ・フィルタ(44 )をさらに含む、請求項1に記載の検出器。 10.無限インパルス応答ノイズ予測子(35;45)を含む前記最尤検出手段 (10)の少なくとも一部が、アナログ回路技術で実装される、請求項1から9 のいずれか一項に記載の検出器。 11.ノイズ予測を行う最尤シーケンス検出に基づく、部分応答等化器を通過し たコード化されたデータ・シーケンスまたはコード化されていないデータ・シー ケンスの検出方法であって、 無限インパルス応答(IIR)ノイズ予測手順が、最尤シーケンス検出プロセ スと一体化されることを特徴とする検出方法。 12.前記無限インパルス応答ノイズ予測が、部分応答等化ノイズ・サンプル( yn)と、最尤検出プロセスの出力から 項11に記載の検出方法。 13.無限インパルス応答ノイズ予測手順が変換関数αD/(1−αD)を実行 し、αが事前に選択した倍率、Dが単位遅延演算子である、請求項11または1 2に記載の検出方法。 14.無限インパルス応答ノイズ予測手順が、変換関数[− (α1+β1)D−(α2+β2)D2]/[(1+α1D+α2D2)]を実行し、α1 、α2、β1、およびβ2が事前に選択した倍率、Dが単位遅延演算子である、請 求項11または12に記載の検出方法。 15.前記無限インパルス応答ノイズ予測手順が、最尤シーケンス検出プロセス のトレリスの各状態ごとに1回ずつ、複数回実行される、請求項11に記載の検 出方法。 メモリから得られた非線形性信号推定値を、無限インパルス応答ノイズ予測手順 を含む最尤シーケンス検出プロセスの各状態についてのブランチ距離計算に使用 するステップと、 それと同時に、 に従う確率勾配手順によって、メモリに含まれる非線形性の を含む、DCオフセットを補償し、読取りヘッドの非対称を補償する手順を含む 、請求項11に記載の検出方法。
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IB1997/000554 WO1998052330A1 (en) | 1997-05-15 | 1997-05-15 | Apparatus and method for noise-predictive maximum likelihood detection |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2000513182A true JP2000513182A (ja) | 2000-10-03 |
JP3540329B2 JP3540329B2 (ja) | 2004-07-07 |
Family
ID=11004566
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54896098A Expired - Fee Related JP3540329B2 (ja) | 1997-05-15 | 1997-05-15 | ノイズ予測最尤検出の装置および方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US6625235B1 (ja) |
EP (1) | EP0981880B1 (ja) |
JP (1) | JP3540329B2 (ja) |
DE (1) | DE69723477T2 (ja) |
WO (1) | WO1998052330A1 (ja) |
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US6763061B1 (en) * | 2000-07-31 | 2004-07-13 | 3Com Corporation | Frequency domain technique for narrowband noise cancellation in DMT receivers |
US6661858B1 (en) * | 2000-09-12 | 2003-12-09 | Beaudin Andre | DC restoration circuit for a radio receiver |
JP4324316B2 (ja) * | 2000-10-23 | 2009-09-02 | 株式会社日立グローバルストレージテクノロジーズ | 垂直磁気記録再生装置 |
JPWO2003012789A1 (ja) * | 2001-07-27 | 2004-11-25 | 富士通株式会社 | 信号処理方法、信号処理回路及び情報記録再生装置 |
DE10141597B4 (de) * | 2001-08-24 | 2017-11-09 | Lantiq Deutschland Gmbh | Verfahren zum Rekonstruieren von über eine Übertragungsstrecke übertragenen Daten in einem Empfänger und entsprechende Vorrichtung |
US20030185292A1 (en) * | 2002-04-02 | 2003-10-02 | Fernandez-Corbaton Ivan Jesus | Adaptive filtering with DC bias compensation |
US20030156635A1 (en) * | 2002-02-20 | 2003-08-21 | Fernandez-Corbaton Ivan Jesus | Adaptive filtering with DC bias compensation |
EP1414036A4 (en) * | 2002-05-28 | 2008-01-16 | Sony Corp | SIGNAL PROCESSING APPARATUS AND METHOD, AND REPRODUCTION DEVICE FOR DIGITAL DATA |
DE10251288B4 (de) * | 2002-11-04 | 2005-08-11 | Advanced Micro Devices, Inc., Sunnyvale | Equalizerschaltung mit Kerbkompensation für einen Direktmischempfänger |
US7116504B1 (en) | 2003-03-25 | 2006-10-03 | Marvell International Ltd. | DC-offset compensation loops for magnetic recording system |
US7369813B2 (en) | 2003-05-14 | 2008-05-06 | Telefonaktiebolaget L M Ericsson (Publ) | Fast calibration of electronic components |
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US7545862B2 (en) * | 2004-02-16 | 2009-06-09 | Sony Corporation | Adaptive equalizer, decoding device, and error detecting device |
US7522680B2 (en) * | 2005-02-09 | 2009-04-21 | International Business Machines Corporation | Apparatus, system, and method for asymmetric maximum likelihood detection |
US7561640B2 (en) * | 2005-04-08 | 2009-07-14 | Seagate Technology Llc | Method and apparatus for interative noise whitening with causal and anti-causal prediction filters |
US7394608B2 (en) * | 2005-08-26 | 2008-07-01 | International Business Machines Corporation | Read channel apparatus for asynchronous sampling and synchronous equalization |
US7522367B2 (en) * | 2005-11-23 | 2009-04-21 | International Business Machines Corporation | Asynchronous read channel shaped toward generalized partial response characteristics |
US8976913B2 (en) * | 2008-09-17 | 2015-03-10 | Lsi Corporation | Adaptive pattern dependent noise prediction on a feed forward noise estimate |
US20110090779A1 (en) * | 2009-10-16 | 2011-04-21 | Mediatek Inc. | Apparatus for generating viterbi-processed data |
US20110167323A1 (en) * | 2010-01-07 | 2011-07-07 | Mediatek Inc. | Error-Correcting Apparatus and Method Thereof |
US8670199B2 (en) | 2010-04-02 | 2014-03-11 | International Business Machines Corporation | Data-dependent noise-predictive maximum likelihood detection (DD-NPML) for magnetic recording |
US8248903B2 (en) * | 2010-04-21 | 2012-08-21 | Mediatek Inc. | Decoding apparatus and method thereof |
US9363068B2 (en) | 2010-08-03 | 2016-06-07 | Intel Corporation | Vector processor having instruction set with sliding window non-linear convolutional function |
RU2012102842A (ru) | 2012-01-27 | 2013-08-10 | ЭлЭсАй Корпорейшн | Инкрементное обнаружение преамбулы |
JP6526415B2 (ja) | 2011-10-27 | 2019-06-05 | インテル・コーポレーション | ベクトル・プロセッサおよび方法 |
US8432780B1 (en) | 2012-05-10 | 2013-04-30 | Mediatek Inc. | Viterbi decoding apparatus using level information generator supporting different hardware configurations to generate level information to Viterbi decoder and related method thereof |
US8743500B2 (en) | 2012-06-19 | 2014-06-03 | International Business Machines Corporation | Adaptive soft-output detector for magnetic tape read channels |
US8797670B2 (en) | 2012-06-19 | 2014-08-05 | International Business Machines Corporation | Adaptive soft-output detector for magnetic tape read channels |
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JP2623638B2 (ja) | 1988-02-25 | 1997-06-25 | 松下電器産業株式会社 | 復号装置 |
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JPH076511A (ja) | 1993-06-21 | 1995-01-10 | Matsushita Electric Ind Co Ltd | 等化・復号装置 |
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-
1997
- 1997-05-15 EP EP97918303A patent/EP0981880B1/en not_active Expired - Lifetime
- 1997-05-15 JP JP54896098A patent/JP3540329B2/ja not_active Expired - Fee Related
- 1997-05-15 WO PCT/IB1997/000554 patent/WO1998052330A1/en active IP Right Grant
- 1997-05-15 US US09/403,628 patent/US6625235B1/en not_active Expired - Fee Related
- 1997-05-15 DE DE69723477T patent/DE69723477T2/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0981880A1 (en) | 2000-03-01 |
JP3540329B2 (ja) | 2004-07-07 |
DE69723477T2 (de) | 2004-05-27 |
US6625235B1 (en) | 2003-09-23 |
DE69723477D1 (de) | 2003-08-14 |
WO1998052330A1 (en) | 1998-11-19 |
EP0981880B1 (en) | 2003-07-09 |
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