EP0461787A2
Expired / Lapsed
EP
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Digital data processing system
Assignee: Canon Inc
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Filing: 1991-05-31
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Granted: —
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Expires: 2011-05-31
Abstract
Abstract A digitally coded signal is encoded with an error correction code and an error detection code. When the signal is decoded, the error correction code is used to correct errors. The error detection code is then used to discriminate whether the error correction process has operated properly, and if it has not operated properly then interpolation is used to avoid remaining errors. Preferably when the data is encoded the error detection code is provided before the error correction code is provided.
Inventors
- 👤 Tetsuya Canon Kabushiki Kaisha Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 14:08
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/94; H04N5/945; G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1876
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
102 words
A digital data processing system for receiving and decoding digital data which has been encoded using both an error correction code and an error detection code, the system using the error correction code to correct errors in the received data and the error detection code to detect errors, characterised in that: the error detection code is used to detect errors present in the received data after error correction using the error correction code, and if such errors are found further action, such as interpolation, is taken to compensate for such errors even if errors have been corrected using the error correction code.
Claim 2
Independent Claim
116 words
A method of processing a received digital data signal which has been encoded using both an error correction code and an error detection code, the method comprising the steps of: i) using the error correction code to correct errors in the received signal if this is required and is possible, and ii) using the error detection code to detect errors, characterised in that: the error detection code is used to detect errors present in the received signal after error correction, and in that the method comprises the step of: iii) compensating for errors which are detected to be present in the received signal after errors in it have been corrected in the said error correction step.
Claim 3
Dependent Claim
92 words
A digital data processing system comprising: a) receiving means (24) for receiving a digital coded signal which contains an error detection code and an error correction code; b) decoding means (30) for decoding said digital coded signal and for generating an indication signal (30b) when an error is detected by using said error detection code; c) compensating means (32) for compensating an output (30a) of said decoding means (30), characterised in that said compensating means (32) compensates the said output (30a) of said decoding means (30) when said indication (30b) is generated.
Claim 4
Dependent Claim
24 words
A system according to claim 3, wherein said receiving means (24) comprises reproducing means for reproducing said digital coded signal from a recording medium.
Claim 5
Dependent Claim
25 words
A system according to claim 3, further comprising: error detection coding means for coding a digital signal so as to contain an error detection code.
Claim 6
Dependent Claim
30 words
A system according to claim 5, further comprising: error correction coding means for coding the digital signal containing the error detection code so as to contain an error correction code.
Claim 7
Dependent Claim
20 words
A system according to claim 6, further comprising: transmission means for transmitting an output of said error correction coding means.
Claim 8
Dependent Claim
21 words
A system according to claim 7, wherein said transmission means comprises recording means for recording said output to a recording medium.
Claim 9
Dependent Claim
34 words
A digital data processing method or apparatus in which compensation for detected errors is carried out in response to the detection of errors even if an error correction step has already been carried out.
Claim 10
Dependent Claim
31 words
A digital processing system for encoding digital data, the system encoding received digital data with an error detection code and further encoding the coded digital data with an error correction code.
Claim 11
Independent Claim
49 words
A method of encoding digital data in which the digital data is encoded with both an error correction code and an error detection code, characterised in that: the digital data is encoded with the error detection code, and afterwards the digital data is encoded with the error correction code.
Claim 12
Dependent Claim
61 words
A digital data processing device comprising: a) error detection coding means for coding a digital signal so as to contain an error detection code; b) error correction coding means for coding the digital signal containing the error detection code so as to contain an error correction code; and c) transmission means for transmitting an output of said error correction coding means.
Claim 13
Dependent Claim
33 words
A system according to any one of claims 1, 3 to 8, 10 and 12 or a method according to claim 2 or claim 11, wherein said error detection code comprises a CRCC.
Claim 14
Independent Claim
42 words
A system according to any one of claims 1, 3 to 8, 10, 12 and 13 or a method according to any one of claims 2, 11 and 13, wherein said error correction code comprises an inner code and an outer code.
Claim 15
Independent Claim
40 words
A system according to any one of claims 1, 3 to 8, 10 and 12 to 14 or a method according to any one of claims 2, 11, 13 and 14, wherein said error correction code comprises a Read-Solomon code.
References Cited (Backward Citations)
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