摘要:
An apparatus for reading address information using an optical head from an optical disk medium which comprise a track groove thereon and on which information is recorded along the track groove on a block unit basis, the block unit having a predetermined length, wherein the block unit includes a number of sub-blocks that are arranged along the groove, wherein a part of the track groove has a wobble shape that is defined by a combination of a steep displacement pattern and a smooth displacement pattern to represent address information of the block unit, the apparatus comprising: a differential operating circuit for obtaining a wobble signal corresponding to the wobble shape; and a signal processor for measuring a phase polarity of a second harmonic of a fundamental wobble frequency of the wobble signal and for judging the measured phase polarity as information 0 or 1 for each sub-block; and a corresponding method and signal processing device
摘要:
An optical recording medium (101) is disclosed that allows information to be recorded and played back properly, even when a type of recording medium in which information is recorded to grooves is used along with a type of recording medium in which information is recorded to lands, as well as a method for recording and playback with this medium. Recording track information is recorded in advance, indicating whether information is to be recorded in the grooves or the lands, whichever of the grooves and lands is best suited to the recording of information is selected on the basis of the recording track information that is read out, and the recording or playback of information is performed.
摘要:
An optical data recording method comprising the steps of: modulating data to be recorded, to generate a plurality of recording modulation codes; and emitting a pulse-like light beam to an optical disc, so that a plurality of recording marks and spaces which have lengths corresponding to the plurality of recording modulation codes are formed on the optical disc, wherein at least two of the plurality of recording marks are formed by the light beam emitted according to a recording pulse train, the recording pulse train comprising: a first pulse which is disposed at a front and forms a leading edge of the recording mark, a last pulse which is disposed at a backend and forms a trailing edge of the recording mark, and a multi-pulse train which is disposed between the first pulse and the last pulse and forms a center of the recording mark, wherein the recording pulse train includes a multi-pulse area in which the multi-pulse train disposed, a position of at least one pulse of the recording pulse train in the multi-pulse area is set so that a multi-pulse duty is set at a predetermined value, the multi-pulse duty being obtained by dividing a pulse width of the multi-pulse train by a period of the multi-pulse train, and the multi-pulse train has a pulse period which is twice as large as a reference period T of the recording modulation code and a corresponding device.
摘要:
An apparatus for reading address information using an optical head from an optical disk medium which comprise a track groove thereon and on which information is recorded along the track groove on a block unit basis, the block unit having a predetermined length, wherein the block unit includes a number of sub-blocks that are arranged along the groove, wherein a part of the track groove has a wobble shape that is defined by a combination of a steep displacement pattern and a smooth displacement pattern to represent address information of the block unit, the apparatus comprising: a differential operating circuit for obtaining a wobble signal corresponding to the wobble shape; and a signal processor for measuring a phase polarity of a second harmonic of a fundamental wobble frequency of the wobble signal and for judging the measured phase polarity as information 0 or 1 for each sub-block; and a corresponding method and signal processing device
摘要:
An optical recording medium (101) is disclosed that allows information to be recorded and played back properly, even when a type of recording medium in which information is recorded to grooves is used along with a type of recording medium in which information is recorded to lands, as well as a method for recording and playback with this medium. Recording track information is recorded in advance, indicating whether information is to be recorded in the grooves or the lands, whichever of the grooves and lands is best suited to the recording of information is selected on the basis of the recording track information that is read out, and the recording or playback of information is performed.
摘要:
An optical disc having marks for dispersed addresses that can be easily detected with high precision. A dispersed address comprises synchronization marks, positive marks, and negative marks. Synchronization marks, positive marks, and negative marks are formed along a groove as partial discontinuities or partial modifications in the wobbled groove.
摘要:
A multi-layered information recording medium including a plurality of recording layers, the multi-layered information recording medium comprising: a user data area for recording user data; and a plurality of spare areas including at least one replacement region, wherein when the user data area includes at least one defect region, the at least one replacement region may be used in place of the at least one defect region, wherein a first spare area of the plurality of spare areas is positioned so as to be contiguous to a first user data area of a first recording layer, a second spare area of the plurality of spare areas is positioned so as to be contiguous to a second user data area of a second recording layer, and the first spare area and the second spare area are positioned approximately at the same radial position on the multi-layered information recording medium.
摘要:
An optical disk apparatus performing either one of recording and reproduction of an optical disk in which groove-shaped groove tracks and land tracks present between the groove tracks are alternately connected to each other in a spiral shape, includes: a recording and reproduction unit for recording a signal in at least one continuous groove track and at least one continuous land track, and then reproducing the signal from the groove track and the land track; a detector for detecting a quality of the signal recorded and reproduced by the recording and reproduction unit; a control parameter setting unit for setting a control parameter related to at least one of the recording and the reproduction of the optical disk; and a controller for changing the control parameter set by the control parameter setting unit, repeating the recording and reproduction performed by the recording and reproduction unit and detection performed by the detector every time the control parameter is changed, and determining the control parameter based on the quality of the signal detected by the detector.