Method and apparatus for determining recording pulse parameters for an optical disc
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsShigeru Furumiya, Junichi Minamino, Mamoru Shoji
Life of this patent
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Abstract
If data is recorded using a disc with. deviating characteristics and a recorder with deviating characteristics, data will not be appropriately recorded, and errors will occur in the read signal. Standard recording pulse parameters specifying recording pulse positions for plural possible mark length and space length combinations are read from a writable optical disc, these standard recording pulse parameters are then used for test writing, the standard recording pulse parameters are changed uniformly or individually, a best recording pulse parameter is thus obtained, and jitter can be reduced.
Claims10
A method for obtaining a recording pulse parameter that is a method for reading standard recording pulse parameters from a writable optical disc to which are prerecorded standard recording pulse parameters defining recording pulse position information for each of plural mark length and space length combinations, correcting a standard recording pulse parameter, and obtaining a best recording pulse parameter, said method:
- performing a first test write to the optical disc using position information for all mark length and space length combinations in the standard recording pulse parameters;
- reproducing the first test write and detecting a first jitter from the reproduced signal;
- adding a first specific amount of change uniformly to the position information for all mark length and space length combinations in the standard recording pulse parameters, and performing a second test write to the optical disc using the uniformly changed position information;
- reproducing the second test write and detecting a second jitter from the reproduced signal;
- and
- comparing the first jitter and second jitter, and selecting the position information used for the test write with less jitter.
A method for obtaining a recording pulse parameter that is a method for reading standard recording pulse parameters from a writable optical disc to which are prerecorded standard recording pulse parameters defining recording pulse position information for each of plural possible mark length and space length combinations, correcting a standard recording pulse parameter, and obtaining a best recording pulse parameter, said method:
- performing a first test write to the optical disc using position information for any one combination selected from all mark length and space length combinations in the standard recording pulse parameters;
- reproducing the first test write and detecting a first jitter from the reproduced signal;
- adding a first specific amount of change to the position information for the above one combination selected from all mark length and space length combinations in the standard recording pulse parameters, and performing a second test write to the optical disc using the changed position information;
- reproducing the second test write and detecting a second jitter from the reproduced signal;
- and
- comparing the first jitter and second jitter, and selecting the position information used for the test write with less jitter.
An apparatus for obtaining a recording pulse parameter that is an apparatus for reading standard recording pulse parameters from a writable optical disc to which are prerecorded standard recording pulse parameters defining recording pulse position information for each of plural possible mark length and space length combinations, correcting a standard recording pulse parameter, and obtaining a best recording pulse parameter, said apparatus comprising:
- a test writing means for performing a first test write to the optical disc using position information for all mark length and space length combinations in the standard recording pulse parameters,
- a jitter detection means for reproducing the first test write and detecting a first jitter from the reproduced signal,
- the test writing means adding a first specific amount of change uniformly to the position information for all mark length and space length combinations in the standard recording pulse parameters, and performing a second test write to the optical disc using the uniformly changed position information, and
- the jitter detection means reproducing the second test write and detecting a second jitter from the reproduced signal, and
- a selection means for comparing the first jitter and second jitter, and selecting the position information used for the test write with less jitter.
An apparatus for obtaining a recording pulse parameter that is an apparatus for reading standard recording pulse parameters from a writable optical disc to which are prerecorded standard recording pulse parameters defining recording pulse position information for each of plural possible mark length and space length combinations, correcting a standard recording pulse parameter, and obtaining a best recording pulse parameter, said apparatus comprising:
- a test writing means for performing a first test write to the optical disc using position information for any one combination selected from all mark length and space length combinations in the standard recording pulse parameters,
- a jitter detection means for reproducing the first test write and detecting a first jitter from the reproduced signal,
- the test writing means adding a first specific amount of change to the position information for. the above one combination selected from all mark length and space length combinations in the standard recording pulse parameters, and performing a second test write to the optical disc using the changed position information, and
- the jitter detection means reproducing the second test write and detecting a second jitter from the reproduced signal, and
- a selection means for comparing the first jitter and second jitter, and selecting the position information used for the test write with less jitter.
Dependencies are inferred from the claim text.