Patent EP0548887A2 successfully refreshed from Google Patents.
EP0548887A2
Expired / Lapsed
EP
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Digital video tape recorder with data block I.D. signal error correction
Assignee: Sony Corp
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Filing: 1992-12-21
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Granted: —
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Expires: 2012-12-21
Abstract
Abstract In a digital video tape recorder that has rotary magnetic heads (13A, 13B) for recording digital video information on a magnetic tape in the form of data blocks having a predetermined length, an ID signal is generated for each data block. The ID signal includes a number of data bits which identify the address of the data block, the information contained in the data block, and so forth. For the purpose of generating error code parity symbols, the ID signal is divided into a sequence of four-bit symbols, and at least two parity symbols are generated (10A, 10S, 10V) according to an error correction code for correcting errors in the sequence of four-bit symbols. The ID signal and parity symbols are recorded together on the magnetic tape. In this way, error correction can be performed on the ID signal during reproduction. <IMAGE>
Inventors
- 👤 Takahito C/O Sony Corporation Seki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 08:34
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/12; G11B20/1201; G11B20/1207; G11B20/1208; G11B20/18; G11B20/1833; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/9201; H04N5/9206; H04N5/926; H04N5/9261; H04N5/9264; H04N5/93; H04N5/94; H04N5/945; H04N9/00; H04N9/79; H04N9/80; H04N9/804; H04N9/8042; H04N9/8047; G11B2220/00; G11B2220/90; H04N9/806; H04N9/8063; H04N9/82; H04N9/8205
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
139 words
A digital recording apparatus including rotary magnetic heads (13A, 13B) for recording digital information on a magnetic tape in the form of data blocks having a predetermined length, said apparatus further comprising: means (17) for generating an ID signal for each of said data blocks, said ID signal including a plurality of data bits which identify at least a selected one of an address of the respective data block and a characteristic of the information contained in the respective data block; means (10I) for dividing said ID signal into a sequence of four-bit symbols; means (10A, 10S, 10V) for generating at least two parity symbols according to an error correction code for correcting an error in said sequence of four-bit symbols; and means (11, 12, 14) for recording said parity symbols on said magnetic tape with said ID signal.
Claim 2
Dependent Claim
17 words
A digital recording apparatus according to claim 1; wherein said error correction code is a Reed-Solomon code.
Claim 3
Dependent Claim
18 words
A digital recording apparatus according to claim 1 or 2; wherein said digital information includes a video signal.
Claim 4
Dependent Claim
33 words
A digital recording apparatus according to any one of claims 1 to 3; further comprising means (11) for compressing and encoding said digital information before said information is recorded on said magnetic tape.
Claim 5
Dependent Claim
33 words
A digital recording apparatus according to claim 4; wherein said means (11) for compressing and encoding said digital information includes means for performing a discrete cosine transform upon blocks of said digital information.
Claim 6
Dependent Claim
22 words
A digital recording apparatus according to any one of claims 1 to 5; wherein said ID signal includes a frame identification bit.
Claim 7
Dependent Claim
33 words
A digital recording apparatus according to any one of claims 1 to 6; wherein said ID signal includes data bits that identify a type of the information contained in the respective data block.
Claim 8
Dependent Claim
33 words
A digital recording apparatus according to any one of claims 1 to 7; wherein said ID signal includes a number for identifying a recording track in which the respective data block is recorded.
Claim 9
Dependent Claim
28 words
A digital recording apparatus according to any one of claims 1 to 8; wherein said ID signal includes a sync block number for identifying the respective data block.
Claim 10
Independent Claim
121 words
A method of recording digital information on a magnetic tape in the form of data blocks having a predetermined length, comprising the steps of: generating (17) an ID signal for each of said data blocks, said ID signal including a plurality of data bits which identify at least a selected one of an address of the respective data block and a characteristic of the information contained in the respective data block; dividing (10I) said ID signal into a sequence of four-bit symbols; generating (10A, 10S, 10V) at least two parity symbols according to an error correction code for correcting an error in said sequence of four-bit symbols; and recording (11-14) said parity symbols on said magnetic tape with said ID signal.
Claim 11
Dependent Claim
19 words
A method of recording digital information according to claim 11; wherein said error correction code is a Reed-Solomon code.
Claim 12
Dependent Claim
20 words
A method of recording digital information according to claim 10 or 11; wherein said digital information includes a video signal.
Claim 13
Independent Claim
32 words
A method of recording digital information according to claims 10 to 12; further comprising the step of compressing and encoding said digital information before the same is recorded on said magnetic tape.
Claim 14
Dependent Claim
32 words
A method of recording digital information according to claim 13; wherein said step of compressing and encoding said digital information comprises performing a discrete cosine transform upon blocks of said digital information.
Claim 15
Independent Claim
24 words
A method of recording digital information according to any one of claims 10 to 14; wherein said ID signal includes a frame identification bit.
Claim 16
Independent Claim
35 words
A method of recording digital information according to any one of claims 10 to 15; wherein said ID signal includes data bits that identify a type of the information contained in the respective data block.
Claim 17
Independent Claim
35 words
A method of recording digital information according to any one of claims 10 to 16; wherein said ID signal includes a number for identifying a recording track in which the respective data block is recorded.
Claim 18
Independent Claim
30 words
A method of recording digital information according to any one of claims 10 to 17; wherein said ID signal includes a sync block number for identifying the respective data block.
References Cited (Backward Citations)
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