Data coding method of an optical disk

Details Data coding method of an optical disk Data coding method of an optical disk

1998-05-19

2001-02-27

Hindi, Nabil (Department: 2753)

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

C369S275300

Reexamination Certificate

active

06195323

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improved data coding method of an optical disk for realizing a high data transfer rate and a high density by simultaneously reproducing dual spiral tracks with one beam of light.
2. Description of the Related Art
In general, a read only optical disk such as a CD-ROM, a DVD-ROM, etc., has recorded information on a single spiral track
1
on a recording surface thereof, as shown in FIG.
1
. The information signals are recorded in binary form depending on whether a pit
3
is formed or not and the length of each one of the pits
3
formed in a depressed form to have a predetermined depth.
In other words, '0' and '1' states are classified by the difference in the intensity of diffracted beams between portions at the ends of each pit
3
and other portions, detected by an optical pickup (not shown), and the information signals are recorded or reproduced by coding or decoding those states.
In the optical disk as described above, since the size of a disk, the distance between neighboring tracks depending on the light spot size focused on the track, the minimum length of the pits, etc., are limited, there is a limit to increasing recording density.
In addition, there is a disadvantage to reading the optical disk in that the read time is long. When a CD-ROM having a storage capacity of 0.65 giga bytes per side is read at a linear speed of 28.8 m/s and a clock frequency of about 100 MHz, it takes more than 3 minutes. When a DVD-ROM having a storage capacity of 4.7 giga bytes per side is read at a linear speed of 6.98 m/s and a clock frequency of about 58.36 MHz, it takes more than 22 minutes.
The inventors have discovered the above-noted problems and have developed solutions to these problems.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a data coding method of an optical disk for enhancing information recording density in a read only optical disk having a dual spiral track.
It is another object of the present invention to provide a data coding method of a read only optical disk for increasing a reading speed of a read only optical disk having a dual spiral track.
Additional objects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Accordingly, to achieve the above and other objects of the present invention, there is provided a data coding method of an optical disk having a dual spiral track including a first spiral and a second spiral which are disposed adjacent to each other and on which information can be simultaneously recorded, wherein the data coding method includes the steps of utilizing a quaternary form depending on whether each respective pit is formed or not on the first spiral and the second spiral and using a modulated code for 8 bit—8 bit nonreturn-to-zero-inverted (NRZI) recording, wherein a run-length-limited (RLL) code in which the minimum run of '0' data bits is 2 is included in each of the 8-bit NRZI units; and converting 8 bit NRZI units into 10 channel bit units by adding 2 channel merging bits between the 8 bit NRZI units.


REFERENCES:
patent: 5446717 (1995-08-01), Kobayashi
patent: 5761172 (1998-06-01), Minemura et al.
patent: 5796692 (1998-08-01), Hosoya
patent: 6023447 (2000-02-01), Kobayashi
patent: 0 376 626 (1990-07-01), None
patent: 0 650 263 (1995-04-01), None
patent: 59-207433 (1984-11-01), None
patent: 63-214919 (1988-09-01), None
patent: 2-172039 (1990-07-01), None
patent: 2-203424 (1990-08-01), None
patent: 5-62200 (1993-03-01), None
patent: 8-69626 (1996-03-01), None
patent: 8-235593 (1996-09-01), None
patent: 9-148936 (1997-06-01), None
patent: 9-326704 (1997-12-01), None
Patent Abstracts of Japan, vol. 009, No. 076 (P-346), Apr. 5, 1985 & JP 59 207433A, Nov. 24, 1984.

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