Patent US5381422A successfully refreshed from Google Patents.
US5381422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for correcting code error
Assignee: Canon Inc
•
Filing: 1993-06-21
•
Granted: 1995-01-10
•
Expires: 2013-06-21
Abstract
Abstract A device receives a code train including information codes and first and second error correction codes which were provided by using the information codes, and then corrects code errors of the information codes. A first correcting circuit corrects code errors of the information codes in accordance with the first error correction check code, and a second correcting circuit corrects code errors of the information codes in accordance with the second error correction check code by deciding whether uncorrectable code errors are present or not in each predetermined number of information codes and generating flag information. The flag information is amended using the first error correction check code, and code errors of the information codes are concealed on the basis of the amended flag information.
Inventors
- 👤 Tetsuya Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:32
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1806; G11B20/1809; G11B20/1876; H; H03; H03M; H03M13/00; H03M13/03; H03M13/05; H03M13/13; H03M13/15; H03M13/159; H03M13/29; H03M13/2903; H03M13/2906; H03M13/2909; H03M13/2927; H04; H04N; H04N19/00; H04N19/85; H04N19/89
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
160 words
A device for receiving a code train including information codes and first and second error correction check codes which were provided by using the information codes and for correcting code errors of the information codes, comprising: (a) first correcting means for correcting code errors of the information codes in accordance with the first error correction check code; (b) second correcting means for correcting code errors of the information codes in accordance with the second error correction check code, said second correcting means deciding whether uncorrectable code errors are present or not in each predetermined number of information codes and generating flag information; (c) amending means for amending the flag information generated by said second correcting means, according to the first error correction check code used by said first correcting means and for generating amended flag information; and (d) concealing means for concealing code errors of the information codes in the code train on the basis of the amended flag information.
Claim 2
Independent Claim
160 words
A device for receiving a code train including information codes and first and second error correction check codes which were provided by using the information codes and for correcting code errors of the information codes, comprising: (a) first correcting means for correcting code errors of the information codes in accordance with the first error correction check code; (b) second correcting means for correcting code errors of the information codes in accordance with the second error correction check code, said second correcting means deciding whether uncorrectable code errors are present or not in each predetermined number of information codes and generating flag information; (c) amending means for amending the flag information generated by said second correcting means, according to the first error correction check code used by said first correcting means and for generating amended flag information; and (d) concealing means for concealing code errors of the information codes in the code train on the basis of the amended flag information.
Claim 3
Dependent Claim
80 words
A device according to claim 1, wherein the information codes are provided by compressing digital information by using a correlation of the digital information and the second error correction code is provided by using information codes extracted in a direction of the correlation, and the device further including expanding means for expanding the information codes processed through the first and second error correcting means to reconstruct the digital information, and for supplying the reconstructed digital information to the concealing means.
Claim 4
Dependent Claim
32 words
A device according to claim 2, wherein the information codes are provided by a process of compressing the digital information and said process is completed for each predetermined amount of digital information.
Claim 5
Dependent Claim
27 words
A device according to claim 3, wherein said concealing means replaces a number of information codes corresponding to said predetermined amount of digital information with other codes.
Claim 6
Dependent Claim
27 words
A device according to claim 1, wherein the first error correction check code is provided by using the information codes and the second error correction check code.
Claim 7
Dependent Claim
45 words
A device according to claim 5, wherein the second error correcting means corrects the code errors of the information codes which have been corrected by the first error correcting means by using the second error correction check code corrected by the first error correcting means.
Claim 8
Dependent Claim
37 words
A device according to claim 6, wherein said amending means discriminates whether code errors are detected by the first error correction check code corresponding to an error position calculated by the second error correcting means or not.
Claim 9
Independent Claim
148 words
A device for receiving a code train including a multiply-encoded error correction code provided by using information codes and for correcting code errors of the information codes, comprising: (a) error correcting means for correcting the code errors of the information codes in accordance with the multiply-encoded error correction code, said error correcting means deciding whether uncorrectable code errors are present or not in each predetermined number of information codes by using an error correction code which is finally decoded and generating flag information; (b) amending means for amending the flag information generated by said error correcting means, by using an error correction code other than the error correction code used in the decision by said error correcting means and for generating amended flag information; and (c) concealing means for concealing code errors of the information codes in the code train on the basis of the amended flag information.
Claim 10
Independent Claim
148 words
A device for receiving a code train including a multiply-encoded error correction code provided by using information codes and for correcting code errors of the information codes, comprising: (a) error correcting means for correcting the code errors of the information codes in accordance with the multiply-encoded error correction code, said error correcting means deciding whether uncorrectable code errors are present or not in each predetermined number of information codes by using an error correction code which is finally decoded and generating flag information; (b) amending means for amending the flag information generated by said error correcting means, by using an error correction code other than the error correction code used in the decision by said error correcting means and for generating amended flag information; and (c) concealing means for concealing code errors of the information codes in the code train on the basis of the amended flag information.
Claim 11
Dependent Claim
80 words
A device according to claim 8, wherein the information codes are provided by compressing digital information by using a correlation of the digital information and the error correction code which is finally decoded is provided by using information codes extracted in a direction of the correlation, and the device further including expanding means for expanding the information codes processed through the error correcting means to reconstruct the digital information, and for supplying the reconstructed digital information to the concealing means.
Claim 12
Independent Claim
150 words
A method for receiving a code train including an information code and first and second error correction check codes which were provided by using the information codes and for correcting code errors of the information codes, comprising the steps of: (a) correcting code errors of the information codes in accordance with the first error correction check code; (b) deciding whether uncorrectable code errors are present in each predetermined number of information codes by using the second error correction check code to generate flag information; (c) amending the flag information generated in said step (b) according to the first error correction check code used by said step (a) and generating amended flag information; (d) correcting code errors of the information codes in accordance with the second error correction check code; and (e) concealing code errors of the information codes in the code train on the basis of the amended flag information.
Claim 13
Independent Claim
150 words
A method for receiving a code train including an information code and first and second error correction check codes which were provided by using the information codes and for correcting code errors of the information codes, comprising the steps of: (a) correcting code errors of the information codes in accordance with the first error correction check code; (b) deciding whether uncorrectable code errors are present in each predetermined number of information codes by using the second error correction check code to generate flag information; (c) amending the flag information generated in said step (b) according to the first error correction check code used by said step (a) and generating amended flag information; (d) correcting code errors of the information codes in accordance with the second error correction check code; and (e) concealing code errors of the information codes in the code train on the basis of the amended flag information.
References Cited (Backward Citations)
US4653052A
Cited
US4726028A
Cited
US4750178A
Cited
US4760576A
Cited
US4881232A
Cited
US4975915A
Cited
US5070503A
Cited
US5068855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-09 | 1998-07-11 | 1999-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-09 | 2002-07-11 | 2003-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-09 | 2006-07-11 | 2007-01-10 | $7700.00 | Window Closed / Lapsed |