Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Control of information signal processing channel
Reexamination Certificate
1999-05-28
2001-10-23
Huber, Paul W. (Department: 2651)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Control of information signal processing channel
C369S047280, C369S059120, C369S124040, C369S124140, C369S275300
Reexamination Certificate
active
06307823
ABSTRACT:
FIELD OF THE INVENTION
1. Background of the Invention
The present invention relates to an optical information medium, an optical information recording apparatus and an optical information recording method, and can be applied to a compact disk (CD) and a digital video disk (DVD) and recording apparatus for these disks, for example. The present invention serves to control a timing of laser light radiation or an output of the laser light during recording depending on information recorded on a track adjacent to bits which are being recorded, thereby creating a disk of high quality which reproduces a good signal having a cross talk reduced.
2. Description of the Related Art
In a conventional compact disk recording apparatus comprising this kind of optical information medium, for example, data to be recorded is processed and then subjected to an EFM (Eight-to-Fourteen Modulation) to form a bit string having a period of 3T to 11T for a predetermined fundamental period T, thereby recording audio data and the like.
Correspondingly, a compact disk player serves to radiate a laser light on a compact disk and to receive a return light to obtain a reproduced signal whose level is changed depending on the amount of the return light, and to change the reproduced signal into a binary signal depending on a predetermined slice level. Furthermore, the compact disk player serves to drive a PLL circuit in response to the binary signal to generate a reproduced clock, and to sequentially latch the binary signal in response to the reproduced clock, thereby generating reproduced data having a period of 3T to 11T corresponding to a bit string formed on the compact disk.
The compact disk player decodes the reproduced data thus generated by a data processing corresponding to a data processing to be performed during recording, and reproduces audio data and the like which are recorded on the compact disk.
Referring to recording and regeneration of the conventional compact disk (CD disk), Japanese Unexamined Patent Publication No. Sho 58-2628 has disclosed a disk recording apparatus in which the output power of a laser light is changed and the pulse width of a pulse signal is reduced so that a bit capable of obtaining a reproduced signal having no difference from a recording signal is formed on a disk. Furthermore, Japanese Unexamined Patent Publication No. Hei 3-83230 has disclosed an optical recording apparatus in which a write pulse having a pulse width smaller by a pulse width equivalent to the extension of a bit caused by the thermal time constant of an optical recording medium is formed from a base band signal and a recording light whose pulse width is modulated by the write pulse is radiated on an optical information medium so that a bit having a normal length is formed on the optical information medium having a great thermal time constant in response to the base band signal. Moreover, Japanese Unexamined Patent Publication No. Sho 62-54830 has disclosed an optical disk recording and reproducing apparatus in which recording is performed while sequentially changing the pulse width of a laser light, the pulse width of the laser light is selected when the pulse width of a reproduced signal has a predetermined value so that optimal recording conditions can be set under a disk to be used and environmental conditions even if a recording sensitivity is varied at every disk and the magnitude of the laser light is changed depending on a temperature, and the reliability of the reproduced signal can be enhanced and the density of information recording can be increased.
In recent years, such a compact disk has generally been reproduced at a high transfer rate. In a reproducing apparatus having a high transfer rate, for example, a compact disk is rotated at a speed which is eight times as high as a predetermined rotational speed or more, thereby reproducing data at a high speed. In such a reproducing apparatus having a high transfer rate, the same amount of data can be obtained in a much shorter time than a usual time.
As an apparatus for realizing suitable reproduction at such a high transfer rate, Japanese Unexamined Patent Publication No. Hei 09-275972 has disclosed the invention which has been made by the same inventor and filed by the same applicant as in the present invention. The above-mentioned invention has provided an optical disk medium, an optical disk recording method and an optical information recording apparatus in which a cross talk sent from an adjacent track is reduced so that less jitter is generated from the cross talk and a stable signal can be reproduced at a high noise level.
In order to perform reproduction at a high transfer rate, the number of rotations of the disk should be increased and also an electronic circuit having a wide band is required. The electronic circuit having a wide band generally has a high noise level. Therefore, the jitter of the disk should be reduced in order to reproduce a stable signal at a high noise level.
The invention made by the same inventor and filed by the same applicant as in the present invention, that is, the Japanese Unexamined Patent Publication No. Hei 09-275972 takes the above respect into consideration, and has proposed an optical information medium, an optical information recording apparatus and an optical information recording method in which a pattern recorded on an adjacent track is predicted in advance and a recording signal is corrected based on the prediction so that less jitter is generated due to a cross talk and a signal can be stably decoded at a high transfer rate.
The invention made by the same inventor and filed by the Japanese Unexamined Patent Publication No. Hei 09-275972 has attained the above-mentioned object very effectively in an optical disk in which recording is performed on the condition of the constant number of rotations that is referred to as a CAV (Constant Angular Velocity). Furthermore, the present invention is very effectively also in an optical disk having the number of rotations changed stepwise, which will hereinafter referred to as a ZCAV (Zoned Constant Angular Velocity).
Furthermore, the above-mentioned patent is also effective in an optical disk in which recording is performed on the condition that the number of rotations is changed with a time that will be hereinafter referred to as a CLV (Constant Linear Velocity). However, in the case where the patent is applied to the optical disk having the CLV, there is a possibility that a prediction value of a cross talk sent from information recorded on an adjacent track might have errors. Depending on the application, there has been a problem in that less effect is obtained by removing the cross talk. If the errors are to be fully reduced, the scale of a circuit might be increased depending on an implementing method.
SUMMARY OF THE INVENTION
In order to solve the above-mentioned problems, the present invention provides an optical information recording apparatus which serves to generate a modulating signal based on data and then to predict a bit string on a disk which is to be data and then to predict a bit string on a disk which is to be generated when the modulating signal is recorded on an optical disk. At this time, in the optical information recording apparatus according to the present invention, the position of the bit string is predicted in relation to a rotation angle in the optical disk. Furthermore, the optical information recording apparatus comprises a adjacent track information computing means for computing the information of the adjacent track in response to the information on the rotation angle thus obtained and the modulating signal, a correction value computing means for obtaining a correction value based on the output of the adjacent track information computing means, and a signal correcting means for correcting the modulating signal based on the correction value. Moreover, the optical information recording apparatus comprises a rotation control means for controlling the rotating means according to the angle information. Therefore, also in a recordin
Huber Paul W.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sony Corporation
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