Patent US4774701A successfully refreshed from Google Patents.
US4774701A
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US
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Data recording method with improved synchronization recovery
Assignee: Mitsubishi Electric Corp
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Filing: 1986-09-09
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Granted: 1988-09-27
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Expires: 2006-09-09
Abstract
Abstract A recording format on a recording medium comprises a data portion (4) in which a data train should be recorded. The data portion (4) comprises a user data portion (44 and 47), a check data portion (45) and resynchronizing pattern portions (46). The data train is divided into m or 4 code words, each code word being n=148 bytes. The resynchronizing pattern portions (46) are added to the data train for every mx3=12 bytes of data to be recorded, and serves to recover data synchronization in the event that data synchronization is missed. Each code word having a check data portion (45) is capable of correcting errors of T bytes, and errors generated in each code word by missing of data synchronization can be corrected.
Inventors
- 👤 Minoru Ozaki
- 👤 Fumio Matsuda
- 👤 Hiroyuki Kumazawa
- 👤 Tooru Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:22
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24085; G11B20/00; G11B20/10; G11B20/12; G11B20/1217; G11B20/18; G11B20/1806; G11B20/1809; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B20/14; G11B20/1403; G11B2020/1476; G11B2220/00; G11B2220/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
224 words
A method for recording data trains on a recording medium intermittently according to the predertermined recording format, said recording format including a preamble portion (2) for performing bit synchronization, a synchronizing pattern portion (3) for indicating the head position of one of said data trains to be recorded and a data portion (4) in which one of said data trains should be recorded, said method comprising the steps of; dividing one of said data trains into m pieces of data, each piece including k bytes; adding check data portions (45) to said m pieces of data (m being an integer) correspondingly to form m code words; recording said data train in said data portion in such a manner that every first byte in m code words is recorded in sequence in first recording cycle starting with the first byte in the first code word, and then every second byte in m code is recorded in sequence in the second recording cycle starting with the second byte in the first code word, and then such a recording cycle of m bytes is repeated continuously until recording of every mth byte in m code words is completed and; adding resynchronizing pattern portions (46) to said data train for every m×r (r>1, r: an integer) bytes of data to be recorded in accordance with the recording sequence.
Claim 2
Independent Claim
224 words
A method for recording data trains on a recording medium intermittently according to the predertermined recording format, said recording format including a preamble portion (2) for performing bit synchronization, a synchronizing pattern portion (3) for indicating the head position of one of said data trains to be recorded and a data portion (4) in which one of said data trains should be recorded, said method comprising the steps of; dividing one of said data trains into m pieces of data, each piece including k bytes; adding check data portions (45) to said m pieces of data (m being an integer) correspondingly to form m code words; recording said data train in said data portion in such a manner that every first byte in m code words is recorded in sequence in first recording cycle starting with the first byte in the first code word, and then every second byte in m code is recorded in sequence in the second recording cycle starting with the second byte in the first code word, and then such a recording cycle of m bytes is repeated continuously until recording of every mth byte in m code words is completed and; adding resynchronizing pattern portions (46) to said data train for every m×r (r>1, r: an integer) bytes of data to be recorded in accordance with the recording sequence.
Claim 3
Dependent Claim
36 words
A method according to claim 1, wherein each of said code words, including said check data portion, is capable of correcting errors of T bytes at the maximum, and said r is not more than T.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |