JP4647926B2 - Dcレベル・シフトを含むサーボ・データの処理 - Google Patents
Dcレベル・シフトを含むサーボ・データの処理 Download PDFInfo
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- JP4647926B2 JP4647926B2 JP2004085827A JP2004085827A JP4647926B2 JP 4647926 B2 JP4647926 B2 JP 4647926B2 JP 2004085827 A JP2004085827 A JP 2004085827A JP 2004085827 A JP2004085827 A JP 2004085827A JP 4647926 B2 JP4647926 B2 JP 4647926B2
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- Prior art keywords
- data
- shift
- detector
- signal
- servo
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Classifications
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- 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
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Digital Magnetic Recording (AREA)
- Moving Of The Head To Find And Align With The Track (AREA)
Description
本出願は、2003年3月24日に出願した米国仮出願第60/457,041号(整理番号992.1094PROV)の出願日の優先権を主張するものである。
Claims (1)
- チャンネルから読まれた信号中のデータを検出する装置であって、
該信号内のDCシフトを調節するために、該信号に等化処理を適用するよう構成された等化器と、
該信号内の該DCシフトの有無を検出し、および対応するDCシフト検出信号を発生するよう構成されたDCシフト検出器とを備え、該等化器は、該DCシフト検出信号に応動して、該信号内の該DCシフトの検出された有無に基づいて該等化処理を変更するものであり、前記装置はさらに、
該信号内の該DCシフトの有無に基づいて該データを検出するよう機能する検出器と、を備え、
該等化器は、該DCシフト検出信号が該信号内の該DCシフトの存在を示すときに、該等化処理をナイキスト等化処理に変更する、装置。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US45704103P | 2003-03-24 | 2003-03-24 | |
US10/436,527 US7231001B2 (en) | 2003-03-24 | 2003-05-13 | Processing servo data having DC level shifts |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2010230323A Division JP5011429B2 (ja) | 2003-03-24 | 2010-10-13 | Dcレベル・シフトを含むサーボ・データの処理 |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2004288359A JP2004288359A (ja) | 2004-10-14 |
JP2004288359A5 JP2004288359A5 (ja) | 2007-04-19 |
JP4647926B2 true JP4647926B2 (ja) | 2011-03-09 |
Family
ID=32994107
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2004085827A Expired - Fee Related JP4647926B2 (ja) | 2003-03-24 | 2004-03-24 | Dcレベル・シフトを含むサーボ・データの処理 |
JP2010230323A Expired - Fee Related JP5011429B2 (ja) | 2003-03-24 | 2010-10-13 | Dcレベル・シフトを含むサーボ・データの処理 |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2010230323A Expired - Fee Related JP5011429B2 (ja) | 2003-03-24 | 2010-10-13 | Dcレベル・シフトを含むサーボ・データの処理 |
Country Status (2)
Country | Link |
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US (2) | US7231001B2 (ja) |
JP (2) | JP4647926B2 (ja) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7075742B2 (en) * | 2003-07-16 | 2006-07-11 | Matsushita Electric Industrial Co., Ltd. | Servo demodulator systems including multiple servo demodulators |
US7072128B2 (en) * | 2003-07-16 | 2006-07-04 | Matsushita Electric Industrial Co., Ltd. | Methods for searching for SAM patterns at multiple nominal frequencies |
US7092177B2 (en) * | 2003-07-16 | 2006-08-15 | Matsushita Electric Industrial Co., Ltd. | Methods for searching for SAM patterns using multiple sets of servo demodulation detection parameters |
US7054083B2 (en) * | 2003-07-16 | 2006-05-30 | Matsushita Electric Industrial Co., Ltd. | Systems for searching for SAM patterns at multiple nominal frequencies |
US7499233B1 (en) * | 2004-04-20 | 2009-03-03 | Marvell International Ltd. | Multi-phase control information detection and signal polarity determination |
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 |
US7365671B1 (en) * | 2006-10-10 | 2008-04-29 | Seagate Technology Llc | Communication channel with undersampled interpolative timing recovery |
US8201066B1 (en) | 2008-03-28 | 2012-06-12 | Western Digital Technologies, Inc. | Disk drive comprising a trellis detector having a read signal whitener in the ACS circuit |
US8381053B1 (en) | 2008-04-09 | 2013-02-19 | Marvell International Ltd. | Generating a moving average |
US8261171B2 (en) * | 2011-01-27 | 2012-09-04 | Lsi Corporation | Systems and methods for diversity combined data detection |
EP2769255A4 (en) | 2011-10-19 | 2015-05-27 | Chromis Fiberoptics Inc | MONOLITHIC TAPE OF POLYMERIC OPTIC FIBERS |
US8730609B1 (en) * | 2011-11-22 | 2014-05-20 | Marvell International Ltd. | DC shift detection and correction |
US9053743B2 (en) * | 2013-03-11 | 2015-06-09 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Servo marginalization |
US9547609B2 (en) * | 2013-10-25 | 2017-01-17 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Data interface for point-to-point communications between devices |
US11665029B2 (en) * | 2021-07-01 | 2023-05-30 | Nvidia Corporation | Feed forward filter equalizer adaptation using a constrained filter tap coefficient value |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07287890A (ja) * | 1994-04-20 | 1995-10-31 | Canon Inc | 情報再生装置 |
JPH10105908A (ja) * | 1996-09-30 | 1998-04-24 | Fujitsu Ltd | サーマルアスペリティ検出方法及び除去方法、磁気ディスク装置並びにそのリトライ方法 |
JPH10340417A (ja) * | 1997-06-06 | 1998-12-22 | Hitachi Ltd | サーマルアスピリティ補償再生チャネル及びデータ記憶ファイル装置及び信号処理lsi |
JP2000090605A (ja) * | 1998-09-08 | 2000-03-31 | Nec Corp | 位置検出信号復調方法および磁気ディスク装置 |
JP2000156042A (ja) * | 1998-11-18 | 2000-06-06 | Fujitsu Ltd | 信号処理装置及び信号処理方法及び情報記憶装置並びに情報再生装置 |
JP2002324370A (ja) * | 2001-04-25 | 2002-11-08 | Matsushita Electric Ind Co Ltd | ディスク装置、リードエラー防止方法及びリードエラー防止プログラム |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6242961B1 (en) * | 1998-10-08 | 2001-06-05 | Altima Communication, Inc. | Methods and circuits for restoration of a drooped DC signal |
US6504884B1 (en) * | 1999-05-12 | 2003-01-07 | Analog Devices, Inc. | Method for correcting DC offsets in a receiver |
WO2000074055A1 (fr) * | 1999-05-28 | 2000-12-07 | Fujitsu Limited | Dispositif de traitement de signaux, procede associe, et dispositif de stockage d'informations |
US7349469B1 (en) * | 2001-08-17 | 2008-03-25 | Ati Research, Inc. | DC offset correction for constant modulus equalization |
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2003
- 2003-05-13 US US10/436,527 patent/US7231001B2/en active Active
-
2004
- 2004-03-24 JP JP2004085827A patent/JP4647926B2/ja not_active Expired - Fee Related
-
2007
- 2007-03-27 US US11/728,862 patent/US7466766B2/en not_active Expired - Fee Related
-
2010
- 2010-10-13 JP JP2010230323A patent/JP5011429B2/ja not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07287890A (ja) * | 1994-04-20 | 1995-10-31 | Canon Inc | 情報再生装置 |
JPH10105908A (ja) * | 1996-09-30 | 1998-04-24 | Fujitsu Ltd | サーマルアスペリティ検出方法及び除去方法、磁気ディスク装置並びにそのリトライ方法 |
JPH10340417A (ja) * | 1997-06-06 | 1998-12-22 | Hitachi Ltd | サーマルアスピリティ補償再生チャネル及びデータ記憶ファイル装置及び信号処理lsi |
JP2000090605A (ja) * | 1998-09-08 | 2000-03-31 | Nec Corp | 位置検出信号復調方法および磁気ディスク装置 |
JP2000156042A (ja) * | 1998-11-18 | 2000-06-06 | Fujitsu Ltd | 信号処理装置及び信号処理方法及び情報記憶装置並びに情報再生装置 |
JP2002324370A (ja) * | 2001-04-25 | 2002-11-08 | Matsushita Electric Ind Co Ltd | ディスク装置、リードエラー防止方法及びリードエラー防止プログラム |
Also Published As
Publication number | Publication date |
---|---|
JP2011008914A (ja) | 2011-01-13 |
US20040190646A1 (en) | 2004-09-30 |
US7231001B2 (en) | 2007-06-12 |
JP2004288359A (ja) | 2004-10-14 |
US7466766B2 (en) | 2008-12-16 |
US20070172005A1 (en) | 2007-07-26 |
JP5011429B2 (ja) | 2012-08-29 |
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