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 Title: |
US6768603:
Precompensation technique and MTR code for high data rate recording
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Cideciyan, Roy Daron; Ruschlikon, Switzerland
Eleftheriou, Evangelos Stavros; Zurich, Switzerland
Marcus, Brian Harry; Los Altos, CA
Modha, Dharmendra Shantilal; San Jose, CA
Olson, Radley Wahl; Cupertino, CA
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| Assignee: |
International Business Machines Corporation, Armonk, NY
other patents from INTERNATIONAL BUSINESS MACHINES CORPORATION (280070) (approx. 44,393)
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| Published / Filed: |
2004-07-27
/ 2001-03-07
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| Application Number: |
US2001000799492
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| IPC Code: |
Advanced:
G11B 5/09;
G11B 20/10;
G11B 20/14;
H03M 5/14;
H03M 7/46;
Core:
H03M 5/00;
more...
IPC-7:
G11B 5/09;
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| ECLA Code: |
G11B5/09; G11B20/10A1; G11B20/14A2B; H03M5/14B; H03M7/46;
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| U.S. Class: |
360/045;
360/040;
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| Field of Search: |
360/045,40,51
G11B 509, 2010, 2014
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| Priority Number: |
| 2001-03-07 |
US2001000799492 |
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| Abstract: |
A method for write-precompensating a waveform for magnetically recording a waveform on a magnetic medium is disclosed. A user data stream is encoded into an encoded data stream so that the encoded data stream has no tribits and no consecutive dibits. No delay is applied to a first transition of a dibit of the encoded data stream. An isolated transition of the encoded data stream is delayed by a first predetermined amount of time. The second transition of a dibit of the encoded data stream is delayed by a second predetermined amount of time, such that the second predetermined amount of time is substantially twice the first predetermined amount of time. Preferably, the encoded data stream satisfies a predetermined run length limited (RLL) k- constraint of k=13 and a predetermined twins t-constraint of t=15. In one embodiment, the encoded data stream is encoded by a block code at rate 8:10. In another embodiment, the encoded data stream is encoded by a block code at rate 16:19.
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| Attorney, Agent or Firm: |
Curtin, Joseph P.Banner & Witcoff, Ltd. ;
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| Primary / Asst. Examiners: |
Hudspeth, David; Davidson, Dan I
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| Maintenance Status: |
E1 Expired Check current status
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Family: |
Show 2 known family members
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First Claim:
Show all 9 claims |
What is claimed is:
1. A method for write-precompensating a waveform for magnetically recording a waveform on a magnetic medium, the method comprising:
- encoding a user data stream into an encoded data stream, the encoded data stream having no tribits and having consecutive combinations of dibits separated by a minimum of two 0 symbols;
- applying no delay to a first transition of a dibit of the encoded data stream;
- delaying an isolated transition of the encoded data stream by a first predetermined amount of time;
- delaying a second transition of a dibit of the encoded data stream by a second predetermined amount of time, the second predetermined amount of time being substantially twice the first predetermined amount of time, the first and second predetermined amounts of time being selected so that the closest interdibit transition of the encoded data stream becomes about equal to a distance between two neighboring intradibit transitions of the encoded data stream.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 3 U.S. patent(s) that reference this one
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| Foreign References: |
None
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| Other Abstract Info: |
DERABS C2003-039535
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| Other References: |
Ashley et al, "Time-Varying Encoders for Constrained Systems: An Approach to Limiting Error Propogation", IEEE Transactions on Information Theory, vol. 46, No. 3, May 2000, p. 1038.*
(6 pages)
Cited by 2 patents
[ISI abstract]
IBM Technical Disclosure Bulletin, "Improved Dibit (2,8) Code ", vol. 29, Issue N0. 2, Jul. 1986, pp. 507-509.*
Zachary A. Keirn and Steven G. McCarthy, Experimental Performance of FDTS/DF Detectors: 8/9(O,k) v. 4/5 MTR Codes, IEEE Transactions on Magnetics, vol. 33, No. 5, Sep. 1997.
Steven G. McCarthy and Zachary A. Keirm, Distance Enhancing Codes for E2 PRML: Performance Comparison using Spinstand Data, IEEE Transactions on Magnetics, vol. 33, No. 5, Sep. 1997.
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