US4897839A
Expired / Lapsed
US
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Coding and decoding method
Assignee: Mitsubishi Electric Corp
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Filing: 1988-02-05
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Granted: 1990-01-30
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Expires: 2008-02-05
Abstract
Abstract Disclosed is a coding and decoding method, in which a certain promised nonzero symbol is appended for coding and decoding, thereby disallowing the presence of a codeword with all-"0" data after coding. The method enables the detection of a fault in an external circuitry by checking the occurrence of an all-"0" received word attributable to the external circuitry.
Inventors
- 👤 Atsuhiro Yamagishi
- 👤 Hideo Yoshida
- 👤 Tohru Inoue
- 👤 Toshihisa Nishijima
- 👤 Yoshiaki Oda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:20
CPC Classifications
H; H03; H03M; H03M13/00; H03M13/03; H03M13/05; H03M13/13; H03M13/15
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
135 words
A coding and decoding method, comprising the steps of: calculating syndromes for a string of information symbols utilizing a nonzero constant in the syndrome calculation; computing check symbols for each of the calculated syndromes; transmitting a code word containing said information symbols and said check symbols; receiving a transmitted code word; calculating syndromes for said received code word utilizing a nonzero constant in the syndrome calculation; determining the existence of an uncorrectable error in said received word when said nonzero constant is appended to a calculated syndrome at a predetermined position; determining the existence of a correctable error in said received word when said nonzero constant is appended to a calculated syndrome at other than said predetermined position; and determining the absence of error in said received word when the calculated syndromes are all zero.
Claim 2
Dependent Claim
135 words
A coding and decoding method, comprising the steps of: calculating syndromes for a string of information symbols utilizing a nonzero constant in the syndrome calculation; computing check symbols for each of the calculated syndromes; transmitting a code word containing said information symbols and said check symbols; receiving a transmitted code word; calculating syndromes for said received code word utilizing a nonzero constant in the syndrome calculation; determining the existence of an uncorrectable error in said received word when said nonzero constant is appended to a calculated syndrome at a predetermined position; determining the existence of a correctable error in said received word when said nonzero constant is appended to a calculated syndrome at other than said predetermined position; and determining the absence of error in said received word when the calculated syndromes are all zero.
Claim 3
Dependent Claim
55 words
In a coding and decoding method utilizing the calculation of syndromes based on information symbols, the improvement comprising: determining the existence of a code word containing all "0" information symbols; and appending a certain nonzero constant to said code word containing all "0" information symbols such that a check symbol section does not become "0".
Claim 4
Dependent Claim
55 words
In a coding and decoding method utilizing the calculation of syndromes based on information symbols, the improvement comprising: determining the existence of a code word containing all "0" information symbols; and appending a certain nonzero constant to said code word containing all "0" information symbols such that a check symbol section does not become "0".
Claim 5
Dependent Claim
36 words
A coding and decoding method according to claim 1, wherein when the syndromes are calculated, a syndrome calculating register is used to implement a syndrome calculation starting at a nonzero state of said syndrome calculating register.
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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) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |