GB2338629A - System and scheme for maximum transition run length codes with location dependent constraints - Google Patents

System and scheme for maximum transition run length codes with location dependent constraints

Info

Publication number
GB2338629A
GB2338629A GB9923044A GB9923044A GB2338629A GB 2338629 A GB2338629 A GB 2338629A GB 9923044 A GB9923044 A GB 9923044A GB 9923044 A GB9923044 A GB 9923044A GB 2338629 A GB2338629 A GB 2338629A
Authority
GB
United Kingdom
Prior art keywords
run length
scheme
code
bit locations
maximum transition
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.)
Granted
Application number
GB9923044A
Other versions
GB9923044D0 (en
GB2338629B (en
Inventor
Kinhing Paul Tsang
Bernardo Rub
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seagate Technology LLC
Original Assignee
Seagate Technology LLC
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 Seagate Technology LLC filed Critical Seagate Technology LLC
Publication of GB9923044D0 publication Critical patent/GB9923044D0/en
Publication of GB2338629A publication Critical patent/GB2338629A/en
Application granted granted Critical
Publication of GB2338629B publication Critical patent/GB2338629B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/46—Conversion to or from run-length codes, i.e. by representing the number of consecutive digits, or groups of digits, of the same kind by a code word and a digit indicative of that kind
    • 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
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M5/00—Conversion of the form of the representation of individual digits
    • H03M5/02—Conversion to or from representation by pulses
    • H03M5/04—Conversion to or from representation by pulses the pulses having two levels
    • H03M5/14—Code representation, e.g. transition, for a given bit cell depending on the information in one or more adjacent bit cells, e.g. delay modulation code, double density code

Abstract

A method and apparatus for encoding data (15,) produces a code stream (153) of code words (190, 192, 194) where each code word includes two subsets of code bits. Each subset of code bits is constrained by a different maximum transition run constraint. In an alternative embodiment, the method and apparatus produced a code stream (153) comprised of alternating even bit locations (188) and odd bit locations (186), where the even bit locations are constrained by a different maximum run length constraint than the odd bit locations.
GB9923044A 1997-04-01 1998-03-31 System and scheme for maximum transition run length codes with location dependent constraints Expired - Fee Related GB2338629B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US4251897P 1997-04-01 1997-04-01
PCT/US1998/006289 WO1998044633A2 (en) 1997-04-01 1998-03-31 Maximum transition run length code

Publications (3)

Publication Number Publication Date
GB9923044D0 GB9923044D0 (en) 1999-12-01
GB2338629A true GB2338629A (en) 1999-12-22
GB2338629B GB2338629B (en) 2001-10-24

Family

ID=21922364

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9923044A Expired - Fee Related GB2338629B (en) 1997-04-01 1998-03-31 System and scheme for maximum transition run length codes with location dependent constraints

Country Status (5)

Country Link
JP (1) JP2001518253A (en)
KR (1) KR20010005905A (en)
DE (1) DE19882278T1 (en)
GB (1) GB2338629B (en)
WO (1) WO1998044633A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7620116B2 (en) 2003-02-28 2009-11-17 Rambus Inc. Technique for determining an optimal transition-limiting code for use in a multi-level signaling system
JP4536412B2 (en) * 2004-04-12 2010-09-01 富士通株式会社 Recording / reproducing apparatus and signal processing circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5553169A (en) * 1990-01-22 1996-09-03 Matsushita Electric Industrial Co., Ltd. Position detecting device using run position and run length of normalized projection data

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5553169A (en) * 1990-01-22 1996-09-03 Matsushita Electric Industrial Co., Ltd. Position detecting device using run position and run length of normalized projection data

Also Published As

Publication number Publication date
WO1998044633A3 (en) 1998-12-23
KR20010005905A (en) 2001-01-15
JP2001518253A (en) 2001-10-09
GB9923044D0 (en) 1999-12-01
GB2338629B (en) 2001-10-24
WO1998044633A2 (en) 1998-10-08
DE19882278T1 (en) 2000-03-30

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20070331