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US5414720A
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Device and method using second error correction code for data in a recording medium
Assignee: Ricoh Co Ltd
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Filing: 1991-11-01
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Granted: 1995-05-09
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Expires: 2011-11-01
Abstract
Abstract A data reproduction device for reproducing a data recorded in a recording medium having a data area and an error correction area including only error correction code data. The areas are formed in the medium. The device comprises a memory device for memorizing the error correction code data of the error correction area and a control device for reading the data from the error correction area and memorizing the read data in the memory device prior to reproducing the data when the medium is installed in the reproducing device. When an error is included in a data reproduced from the data of the data area, the control device controls the reproducing device in such a way that an error correction code data corresponding to the data including the error is read from the memory device so as to correct the error of the data.
Inventors
- 👤 Yuichi Kadokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:51
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/08; G06F11/10; G06F11/1076; G06F11/1008; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1833
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
203 words
A data reproducing device for reproducing data recorded in a recording medium formed with a data area and an error correction code area, said data area recorded with data and a first error correction code, said error correction code area recorded with only a second error correction code, said device comprising: a reading device for reading said data and said first error correction code from said data area and for reading said second error correction code from said error correction code area, respectively; a memory circuit for memorizing said read second error correction code; a demodulating circuit for demodulating said read data; an error correcting circuit for detecting and correcting an error included in said demodulated data; and a control circuit for transmitting said read second error correction code to said memory circuit prior to demodulating the data, and for controlling said error correcting circuit in such a manner that, when an error in said demodulated data from said demodulating circuit is not corrected completely by said error correcting circuit using said first error correction code, said error correcting circuit corrects said error in said demodulated data from said demodulating circuit by using said memorized second error correction code in said memory circuit.
Claim 2
Dependent Claim
203 words
A data reproducing device for reproducing data recorded in a recording medium formed with a data area and an error correction code area, said data area recorded with data and a first error correction code, said error correction code area recorded with only a second error correction code, said device comprising: a reading device for reading said data and said first error correction code from said data area and for reading said second error correction code from said error correction code area, respectively; a memory circuit for memorizing said read second error correction code; a demodulating circuit for demodulating said read data; an error correcting circuit for detecting and correcting an error included in said demodulated data; and a control circuit for transmitting said read second error correction code to said memory circuit prior to demodulating the data, and for controlling said error correcting circuit in such a manner that, when an error in said demodulated data from said demodulating circuit is not corrected completely by said error correcting circuit using said first error correction code, said error correcting circuit corrects said error in said demodulated data from said demodulating circuit by using said memorized second error correction code in said memory circuit.
Claim 3
Dependent Claim
54 words
A data reproducing device for reproducing data recorded in a recording medium according to claim 1, wherein said second error correction code corresponds to data in said data area, and the error correction code corresponding to said data in said data area is read from said memory circuit so as to correct said error.
Claim 4
Dependent Claim
15 words
A data reproducing device according to claim 1, wherein said memory circuit comprises a RAM.
Claim 5
Dependent Claim
28 words
A data reproducing device according to claim 3, wherein said recording medium comprises an optical disc, and said reading device comprises an optical head having a laser diode.
Claim 6
Dependent Claim
17 words
A data reproducing device according to claim 1, wherein said recording medium is a read only medium.
Claim 7
Dependent Claim
93 words
A data reproducing device according to claim 1, wherein said second error correction code comprises a parity code, said reading device reads said parity code from said error correction code area, said memory circuit memorizes said read parity code, and said control circuit transmits said read parity code to said memory circuit prior to demodulating the data and, when an error in said demodulated data is not corrected completely by using said first error correction code, said error correcting circuit corrects said error by using said memorized parity code in said memory circuit.
Claim 8
Dependent Claim
41 words
A data reproducing device according to claim 1, wherein said error correcting circuit transmits an error status signal to said control circuit when said error is not corrected completely in said error correcting circuit by using said second error correction code.
Claim 9
Independent Claim
143 words
A method for reproducing data recorded in a recording medium formed with a data area and an error correction area, said data area recorded with data and a first error correction code and said error correction code area recorded with only a second error correction code, said method comprising the steps of: reading said second error correction code from said error correction code area; memorizing said read second error correction code prior to reading said data; reading said data and said first correction code from said data area; demodulating said read data; detecting and correcting an error in said demodulated data by using said read first error correction code; and correcting said error by using said memorized second error correction code in said memory means, in a case where said error is not corrected completely by using said read first error correction code.
Claim 10
Independent Claim
143 words
A method for reproducing data recorded in a recording medium formed with a data area and an error correction area, said data area recorded with data and a first error correction code and said error correction code area recorded with only a second error correction code, said method comprising the steps of: reading said second error correction code from said error correction code area; memorizing said read second error correction code prior to reading said data; reading said data and said first correction code from said data area; demodulating said read data; detecting and correcting an error in said demodulated data by using said read first error correction code; and correcting said error by using said memorized second error correction code in said memory means, in a case where said error is not corrected completely by using said read first error correction code.
Claim 11
Dependent Claim
36 words
A method according to claim 8, further comprising a step of indicating an error status in a case where said error is not corrected completely in said correcting step by using said second error correction code.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-05-08 | 1998-11-07 | 1999-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-05-08 | 2002-11-07 | 2003-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-05-08 | 2006-11-07 | 2007-05-09 | $7700.00 | Window Closed / Lapsed |