EP0267029A1
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EP
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Methods of and apparatus for recording and/or reproducing digital data
Assignee: Sony Corp
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Filing: 1987-11-04
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Granted: —
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Expires: 2007-11-04
Abstract
Abstract In apparatus for recording and/or reproducing digital data, digital data such as video data are encoded (104, 114a, 114b) with error correction codes including outer codes and inner codes so that respective predetermined numbers of symbols or words form respective blocks to which are added synchronizing data, and are then recorded on oblique tracks of a tape medium such as a magnetic tape (T) with rotary heads (118a, 118b) whereby the redundant symbols of the outer error correction code followed by the information data and inner error correction code are recorded on the beginning of each track, so that even if the data reproduced from the beginning portion of the tape (T) contains errors, the information data is not much influenced by the errors.
Inventors
- 👤 Kouzou C/O Patent Div. Sony Corporation Kaminaga
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 00:30
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/09; G11B20/00; G11B20/10; G11B20/18; G11B20/1806; G11B20/1809; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/94; H04N5/945
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A method of recording digital data, the method comprising the steps of: dividing a digital data series into respective blocks each including a first predetermined number of data symbols; generating outer error correction code blocks each including said first predetermined number of data symbols and a fourth predetermined number of redundant symbols; and recording said digital data series with said redundant symbols of said outer error correction code block and inner error correction code block on oblique tracks of a tape recording medium; characterized in that: said redundant symbols of said outer error correction code block are recorded first and followed by said data symbols and said redundant symbols of said inner error correction code block on said tracks.
Claim 2
Independent Claim
119 words
A method of recording digital data, the method comprising the steps of: dividing a digital data series into respective blocks each including a first predetermined number of data symbols; generating outer error correction code blocks each including said first predetermined number of data symbols and a fourth predetermined number of redundant symbols; and recording said digital data series with said redundant symbols of said outer error correction code block and inner error correction code block on oblique tracks of a tape recording medium; characterized in that: said redundant symbols of said outer error correction code block are recorded first and followed by said data symbols and said redundant symbols of said inner error correction code block on said tracks.
Claim 3
Independent Claim
159 words
An apparatus for recording digital data, the apparatus comprising: means (103) for dividing a digital data series into respective blocks each including a first predetermined number of data symbols; means (104) for generating outer error correction code blocks each including said first predetermined number of data symbols and a second predetermined number of redundant symbols; means (114a, 114b) for generating inner error correction code blocks each including a third predetermined number of data symbols and a fourth predetermined number of redundant symbols; and means (115, 116a, 116b, 117a, 117b, 118a, 118b) for recording said digital data series with said redundant symbols of said outer error correction code block and inner error correction code block on oblique tracks of a tape recording medium (T); characterized in that: said redundant symbols of said outer error correction code block are recorded first and followed by said data symbols and said redundant symbols of said inner error correction code block on said tracks.
Claim 4
Independent Claim
159 words
An apparatus for recording digital data, the apparatus comprising: means (103) for dividing a digital data series into respective blocks each including a first predetermined number of data symbols; means (104) for generating outer error correction code blocks each including said first predetermined number of data symbols and a second predetermined number of redundant symbols; means (114a, 114b) for generating inner error correction code blocks each including a third predetermined number of data symbols and a fourth predetermined number of redundant symbols; and means (115, 116a, 116b, 117a, 117b, 118a, 118b) for recording said digital data series with said redundant symbols of said outer error correction code block and inner error correction code block on oblique tracks of a tape recording medium (T); characterized in that: said redundant symbols of said outer error correction code block are recorded first and followed by said data symbols and said redundant symbols of said inner error correction code block on said tracks.
Claim 5
Independent Claim
238 words
A method of reproducing digital data, the method comprising the steps of: reproducing a digital data series with redundant symbols of an outer error correction code block and an inner error correction code block, whereby said redundant symbols are generated in such a manner that said digital data series is divided into respective blocks each including a first predetermined number of data symbols, said outer error correction code block is generated so as to include said first predetermined number of data symbols and a second predetermined number of said redundant symbols, and said inner error correction code block is generated so as to include a third predetermined number of data symbols and a fourth predetermined number of said redundant symbols, and whereby said redundant symbols of said outer error correction code block is reproduced first and followed by said data symbols and said redundant symbols of said inner error correction code block from oblique tracks of a tape recording medium (T); decoding said inner error correction code block including said third predetermined number of data symbols and said fourth predetermined number of redundant symbols; tagging an error flag if a predetermined number of error symbols exist in said in ner error correction code block; and decoding said outer error correction code block including said first predetermined number of data symbols and said second predetermined number of redundant symbols with said error flag to derive said digital data series.
Claim 6
Independent Claim
238 words
A method of reproducing digital data, the method comprising the steps of: reproducing a digital data series with redundant symbols of an outer error correction code block and an inner error correction code block, whereby said redundant symbols are generated in such a manner that said digital data series is divided into respective blocks each including a first predetermined number of data symbols, said outer error correction code block is generated so as to include said first predetermined number of data symbols and a second predetermined number of said redundant symbols, and said inner error correction code block is generated so as to include a third predetermined number of data symbols and a fourth predetermined number of said redundant symbols, and whereby said redundant symbols of said outer error correction code block is reproduced first and followed by said data symbols and said redundant symbols of said inner error correction code block from oblique tracks of a tape recording medium (T); decoding said inner error correction code block including said third predetermined number of data symbols and said fourth predetermined number of redundant symbols; tagging an error flag if a predetermined number of error symbols exist in said in ner error correction code block; and decoding said outer error correction code block including said first predetermined number of data symbols and said second predetermined number of redundant symbols with said error flag to derive said digital data series.
Claim 7
Independent Claim
254 words
An apparatus for reproducing digital data, the apparatus comprising: means (201a, 201b, 202a, 202b) for reproducing a digital data series with redundant symbols of an outer error correction code block and an inner error correction code block, whereby said redundant symbols are generated in such a manner that said series of digital data is divided into respective blocks each including a first predetermined number of data symbols, said outer error correction code block is generated so as to include said first predetermined number of data symbols and a second predetermined number of said redundant symbols, and said inner error correction code block is generated so as to include a third predetermined number of data symbols and a fourth predetermined number of said redundant symbols, and whereby said redundant symbols of said outer error correction code block are reproduced first and followed by said data symbols and said redundant symbols of said inner error correction code block from oblique tracks of a tape recording medium (T); means (205a, 205b) for decoding said inner error correction code block including said third predetermined number of said data symbols and said fourth predetermined number of redundant symbols; means (205a, 205b) for tagging an error flag if a predetermined number of error symbols exists in said inner error correction code block; and means (211, 212) for decoding said outer error correction code block including said first predetermined number of data symbols and said second predetermined number of redundant symbols with said error flag to derive said digital data series.
Claim 8
Independent Claim
254 words
An apparatus for reproducing digital data, the apparatus comprising: means (201a, 201b, 202a, 202b) for reproducing a digital data series with redundant symbols of an outer error correction code block and an inner error correction code block, whereby said redundant symbols are generated in such a manner that said series of digital data is divided into respective blocks each including a first predetermined number of data symbols, said outer error correction code block is generated so as to include said first predetermined number of data symbols and a second predetermined number of said redundant symbols, and said inner error correction code block is generated so as to include a third predetermined number of data symbols and a fourth predetermined number of said redundant symbols, and whereby said redundant symbols of said outer error correction code block are reproduced first and followed by said data symbols and said redundant symbols of said inner error correction code block from oblique tracks of a tape recording medium (T); means (205a, 205b) for decoding said inner error correction code block including said third predetermined number of said data symbols and said fourth predetermined number of redundant symbols; means (205a, 205b) for tagging an error flag if a predetermined number of error symbols exists in said inner error correction code block; and means (211, 212) for decoding said outer error correction code block including said first predetermined number of data symbols and said second predetermined number of redundant symbols with said error flag to derive said digital data series.
References Cited (Backward Citations)
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