KR0176524B1 - Optic disc recording device and reproducing method - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc recording medium and a reproduction method thereof, and more particularly, to a recording medium and a reproduction method capable of recording two data strings on one track and differentially reproducing the two data strings.

In order to achieve the object of the present invention, the present invention provides a read step of reading two data strings recorded on one track, and differentially outputs two binary data strings output from the read step, -1, 0, And a data string output step of outputting a three-value data string.

According to the present invention, unlike conventional disks, since two data strings are recorded on one track and these signals are made into differential signals to reproduce data, an advantage of having a data density improvement of at least 1.5 times compared to the conventional disk is obtained. have.

Description

Optical disc recording medium and its reproduction method

1 is a track configuration diagram of an optical disk according to the present invention.

FIG. 2 is a detail of the track showing section A of the track in FIG.

3A and 3B are data signal waveform diagrams read by the section of beam # 1 and beam # 2 in FIG.

3c is a waveform diagram of differential waveforms of FIGS. 3a and 3b.

4 is a block diagram showing an apparatus for reading an optical disc recording medium according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc recording medium and a reproduction method thereof, and more particularly, to a recording medium and a reproduction method capable of differentially reproducing two data strings in a recording medium having two data strings in one track.

Background Art Generally, optical discs are widely used as mass memories for document / image files and code data. Compact discs have a large capacity for recording 74 minutes of video and audio data, and have a small disc diameter compared to laser discs, which are compact and enable high-speed random access compared to tape media.

However, the recording capacity is insufficient to be used as a video medium for recording a movie of 90 to 120 minutes, so two discs are required. In order to enjoy a movie as a compact disc, two discs must be played. There is a ship.

Therefore, studies are being made to double the recording density of compact discs in order to record one movie on one disc. One approach is to configure the recording layer of the disk in multiple layers, and this method has a problem that the meaning of the multilayer optical disc is halved because time is consumed when the reproduction is transferred from one layer to another. . Another method is to increase the transfer rate by rotating the disk with one track at high speed when processing a large amount of data, but this method may operate unstable depending on the deformation of the disk. That is, in the past, since data is read from a disc having one data string on one track, there is a limit in increasing the data density in the track direction during reproduction due to the size of the optical spot for reading the data.

Accordingly, an object of the present invention is to reproduce the logical reproduction data density in the track direction by differentially reproducing a signal of each data string from a recording medium in which two data strings are recorded on one track in order to solve the conventional problems as described above. To provide a way.

In order to achieve the above object, the present invention provides a recording medium of an optical disc in which a plurality of tracks are recorded, wherein the optical disc in which the plurality of tracks are recorded has two data strings recorded in one track.

In order to achieve the above object, the present invention provides a reproducing method of an optical disc in which two data strings are recorded in one track, the reading step of respectively reading two data strings recorded on the one track. ; And a data string output step of differentially outputting the respective binary data strings output in the reading step as tri-valued data strings of -1, 0, and 1.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a track configuration diagram of an optical disk according to the present invention, and has two data strings in one track.

FIG. 2 is a detailed view of the track showing the section A of the track in FIG. 1, showing the section of beam # 1 and the section of beam # 2.

3A and 3B are data signal waveform diagrams read by the section of beam # 1 and beam # 2 in FIG. 2, and are composed of binary (1, 0) pulse signals.

FIG. 3C is a waveform diagram in which the waveforms of FIGS. 3A and 3B are differential from each other, and is composed of third-level (+1, 0, -1) signals.

4 is a block diagram showing an apparatus for reading an optical disc recording medium according to the present invention, and includes Pict 1, 2 (410, 420), Delays (1), (2) (430, 440), and a differential amplifier ( 450).

Specific embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4.

As shown in FIG. 1, two data strings are recorded on one track (section A) of an optical disk having a plurality of tracks, where two data strings are set as one track. The interval between adjacent data strings may be equal to the track pitch of the existing disc. Therefore, there is no problem of cross-talk between two or more data strings. A detailed data string in section A of FIG. 1 is shown in FIG. This can double the shortest mark which depends on the resolution of the optical pick up in the longitudinal direction (track direction) of the data string.

Therefore, each of the two recorded data streams is composed of the beam # 1 reflected from the pick 1 410 of FIG. 4 and the beam # 2 reflected from the pick 2 420 (circle part of FIG. 2). Will be read). At this time, since the signals read from each pick may be delayed due to mechanical assembly and tolerance, the normal signals are generated through the delay (1) 430 and the delay (2) 440. In the signals output from the delayers 430 and 440, data signal strings read from two data strings are output as shown in the waveforms of FIGS. 3A and 3B. That is, FIG. 3a is a data signal read from beam # 1, and FIG. 3b is a data signal read from beam # 2. When two data strings having the binary components (1, 0) are input to the differential amplifier 450 of FIG. 4, a signal having a third component of -1, 0, 1, which is the difference component of the two data strings, as shown in FIG. Is output. That is, when the signal (b) of FIG. 3b is differential from the signal (a) of FIG. 3a, the signal (c) of FIG. 3c is generated, and the underlined value 1 is the difference component. Therefore, the third level signal output from the differential amplifier 450 is logically 1.5 times higher in data density than the conventional second level signal.

As described above, according to the present invention, when reproducing a disc in which two or more data strings are recorded on one track, by dividing two or more data strings from each other, the size of one data string can be further reduced, and the two signals can be differentially In this case, a signal having a three-value (-1, 0, 1) level from the existing binary value (0 or 1) can be obtained, thereby further improving the reproduction data density.

Claims (2)

An optical disk reproducing method in which two data strings are recorded in one track, comprising: a reading step of reading two data strings recorded on the one track as binary data, respectively by means of a laser beam; And a data string output step of differentially outputting the respective binary data strings output in the reading step as the three-value data strings. The optical disc recording medium of claim 1, wherein at least two data strings are recorded in one track.