EP0314512A2
Expired / Lapsed
EP
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Method for recording digital data
Assignee: Canon Inc
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Filing: 1988-10-28
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Granted: —
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Expires: 2008-10-28
Abstract
Abstract There is provided a digital data recording system in which digital data which is encoded by the RLL (Run Length Limited) encoding system in which code "1" does not continue is recorded onto a recording medium in accordance with an NRZL (Non Return to Zero) rule. In this system, the digital data is input, a width (T) of pulse corresponding to code "1" in the input digital data is converted into a pulse of a width (T′) larger than the pulse width, and the digital data of the converted pulse width is recorded onto the recording medium. A change amount of the pulse width is made different in accordance with the minimum number of codes "0" arranged between codes "1" and "1" in the digital data. With this system, the error rate of the digital data recorded on the recording medium can be reduced. In the case of the same error rate, the recording density can be improved.
Inventors
- 👤 Hideaki Sato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 19:29
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/10009; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
75 words
A digital data recording method whereby digital data encoded by an encoding system in which code "1" does not continue is recorded onto a recording medium, said method comprising the steps of; inputting said digital data; converting a width of pulse corresponding to code "1" in said input digital data into a pulse of a width larger than said pulse width; and recording the digital data of said converted pulse width onto said recording medium.
Claim 2
Dependent Claim
75 words
A digital data recording method whereby digital data encoded by an encoding system in which code "1" does not continue is recorded onto a recording medium, said method comprising the steps of; inputting said digital data; converting a width of pulse corresponding to code "1" in said input digital data into a pulse of a width larger than said pulse width; and recording the digital data of said converted pulse width onto said recording medium.
Claim 3
Dependent Claim
30 words
A method according to claim 1, wherein in said converting step, a change amount of said pulse width is made different in accordance with a parameter of said encoding system.
Claim 4
Dependent Claim
40 words
A method according to claim 2, wherein in said converting step, a change amount of said pulse width is made different in accordance with the minimum number of codes "0" existing between codes "1" and "1" in said digital data.
Claim 5
Dependent Claim
17 words
A method according to claim 1, wherein said encoding system is a Run Length Limited encoding system.
Claim 6
Dependent Claim
30 words
A method according to claim 4, wherein in said recording step, the Run Length Limited encoded digital data is recorded in accordance with an NRZ (Non Return to Zero) rule.
Claim 7
Dependent Claim
24 words
A method according to claim 1, wherein in said recording step, said digital data is recorded by irradiating a light onto said recording medium.
Claim 8
Dependent Claim
23 words
A method according to claim 6, wherein in said recording step, the light is irradiated by a pulse corresponding to said code "1".
Claim 9
Dependent Claim
38 words
A method according to claim 1, wherein in said converting step, a change amount of said pulse width is made different in accordance with the number of codes "0" between codes "1" and "1" in said digital data.
Claim 10
Dependent Claim
78 words
A digital data recording method whereby digital data which is encoded by an encoding system in which code "1" does not continue is recorded onto a recording medium, said method comprising the steps of: inputting said digital data: converting a width of pulse corresponding to code "1" in said input digital data into an almost half of an interval between codes "1" and "1"; and recording the digital data of said converted pulse width onto said recording medium.
Claim 11
Dependent Claim
78 words
A digital data recording method whereby digital data which is encoded by an encoding system in which code "1" does not continue is recorded onto a recording medium, said method comprising the steps of: inputting said digital data: converting a width of pulse corresponding to code "1" in said input digital data into an almost half of an interval between codes "1" and "1"; and recording the digital data of said converted pulse width onto said recording medium.
Claim 12
Dependent Claim
17 words
A method according to claim 9, wherein said encoding system is a Run Length Limited encoding system.
Claim 13
Dependent Claim
30 words
A method according to claim 10, wherein in said recording step, the Run Length Limited encoded digital data is recorded in accordance with an NRZ (Non Return to Zero) rule.
Claim 14
Dependent Claim
24 words
A method according to claim 9, wherein in said recording step, said digital data is recorded by irradiating a light onto said recording medium.
Claim 15
Dependent Claim
24 words
A method according to claim 12, wherein in said recording step, the light is irradiated by pulses of the number of said codes "1".
Claim 16
Independent Claim
67 words
A method for recording binary data in which the periods for which the data is at one and the other binary levels are predetermined and variable, respectively, wherein the binary data is modified so that in the modified data the period corresponding to the predetermined period in the unmodified data is different from said predetermined period, and recording is performed on the basis of the modified data.
Claim 17
Independent Claim
67 words
A method for recording binary data in which the periods for which the data is at one and the other binary levels are predetermined and variable, respectively, wherein the binary data is modified so that in the modified data the period corresponding to the predetermined period in the unmodified data is different from said predetermined period, and recording is performed on the basis of the modified data.
References Cited (Backward Citations)
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