EP0593037A2
Expired / Lapsed
EP
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Data recording method, data recording apparatus and data recording medium
Assignee: Sony Corp
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Filing: 1993-10-13
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Granted: —
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Expires: 2013-10-13
Abstract
Abstract In recording information by shifting the positions of the front edge and the rear edge of each pit on a medium stepwise from specified reference positions according to recording data, the edges of each pit are displaced stepwise with a unit of macro-step of 0.04 µm, to express the data. The positions of the edges with macro-step are further adjusted to be displaced stepwise with a unit of micro-step of 256 kinds, thus suppressing the Inter Symbol Interference. With this adjustment, it is possible to reduce the influence of the Inter Symbol Interference, and hence to perform the recording with high density.
Inventors
- 👤 Seiji C/O Sony Corporation Kobayashi
- 👤 Joost c/o Sony Corporation de Kock
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 04:40
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/0045; G11B20/00; G11B20/10; G11B20/10009; G11B7/24; G11B7/2407; G11B7/24085
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
67 words
A data recording method comprising the steps of: displacing the position of the edge of each pit stepwise with a first width as a unit according to recording data; and displacing the position of said edge specified by said first width, at a position where the interference due to the positions of the other edges is minimized, stepwise with a second width smaller than said first width.
Claim 2
Dependent Claim
36 words
A data recording method according to claim 1, wherein the adjustment for the position of said edge with said second width is performed in consideration of the positions of at least two of said adjacent edges.
Claim 3
Dependent Claim
36 words
A data recording method according to claim 1, wherein the adjustment for the position of said edge with said second width is performed in consideration of the positions of at least continuous four of said edges.
Claim 4
Dependent Claim
31 words
A data recording method according to claim 1, 2 or 3, wherein the adjustment for the position of said edge with said second width is performed using a line spread function.
Claim 5
Dependent Claim
30 words
A data recording method according to claim 1, 2, or 3, wherein the adjustment for the position of said edge with said second width is performed using a Hopkins' method.
Claim 6
Dependent Claim
61 words
A data recording method according to any of claims 1 to 5, wherein the adjustment for the position of said edge with said second width is performed in such a manner that the information point specified by the positions of said adjacent two edges is positioned at a grid on coordinate axes specified by the positions of said adjacent two edges.
Claim 7
Dependent Claim
41 words
A data recording method according to claim 6, wherein the adjustment for the position of said edge with said second width is performed in such a manner that the area of said information point is made smaller on said coordinate axes.
Claim 8
Dependent Claim
65 words
A data recording method according to claim 7, wherein the adjustment for the position of said edge with said second width is performed in such a manner that, on second coordinate axes specified by the positions of the other edges positioned on the front and rear sides of said two adjacent edges specifying said coordinate axes, said information point is concentrated at the intermediate position.
Claim 9
Dependent Claim
83 words
A data recording medium for recording data by displacing the position of the edge of each pit, comprising: a means for displacing the position of the edge of said pit stepwise with a first width as a unit according to recording data; and a means for displacing the position of said edge specified by said first width, at a position where the interference due to the positions of the other edges is minimized, stepwise with a second width smaller than said first width.
Claim 10
Dependent Claim
151 words
A data recording apparatus of displacing the position of the edge of each pit on a recording medium stepwise with a first width for recording data on said recording medium, comprising: a converting means (3) for converting the data to be recorded into the data corresponding to the number of steps displaced with said first width; a calculating means (9) for calculating the position of said edge displaced with said first width corresponding to the data converted by said converting means (3), and displacing the position of said edge specified by said first width stepwise with a second width smaller than said first width, thereby calculating the position where the interference due to the positions of the other edges; and a signal generating means (10) for outputting a signal with a timing corresponding to the position of the edge of said pit according to the output of said calculating means (9).
Claim 11
Dependent Claim
71 words
A data recording apparatus according to claim 10, wherein said signal generating means (10) comprising: a D/A converting means (31, 34) for digital-analog converting the output of said calculating means (9); a sawtooth wave generating means (33, 36) for generating a sawtooth wave; a comparing means (32, 35) for a sawtooth wave outputted from said sawtooth wave generating means (33, 36) with the output of said D/A converting means (31, 34).
References Cited (Backward Citations)
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