KR20000066667A - Method for distinction kind of disc - Google Patents

Abstract

PURPOSE: A method of distinguish a kind of a disk is to detect the kind of the disk according a reflecting rate of the disk, and control a position of an optical pick-up device according to the kind of the disk, thereby preventing an erroneous operation of a disk driver. CONSTITUTION: A method of distinguish a kind of a disk comprises steps of fixing an optical pick-up device at a vertical position of the disk, storing a look-up table type surface reflected wave time and disk distinguishing information in a storing medium, moving the optical pick-up device to the vertical position of the disk to radiate light from the optical pick-up device on the disk and simultaneously count a time, detecting the surface reflected wave time, detecting a S-curve wave time, detecting the kind of the disk and the position of the optical pick-up device from the look-up table as a using the disk distinguishing information and the surface reflected wave time and the S-curve wave time, and moving the optical pick-up device to a desired position according to the detected kind of the disk to reproduce a data of the disk, In the method, the disk distinguishing information is the kind of the disk and the position of the optical pick-up device according to a difference between the surface reflected wave time and the S-curve wave time.

Description

Method for distinction kind of disc}

The present invention relates to a disc type discrimination method, and more particularly, to a disc type discrimination method for reproducing a disc according to a disc type after disc type is determined according to the reflectance of the disc.

Representative methods of reproducing recorded information include magnetic and light. The magnetic method refers to a method of detecting information on an arrangement of polarities of magnetic materials applied to a magnetic medium and reproducing information according to the polarity (or phase). The recording and reproducing operations are free from the use of magnetic materials. It has the advantage.

In contrast, the light-based method scans light onto the recording surface of the recording medium and reproduces the information by detecting the state (S-CURVE wavelength) diffusely reflected by the pits processed on the recording medium. This method has a merit that the information preservation efficiency is very excellent in processing pits on a recording medium.

Representative storage media using optical include CD-ROM (Compact Disk-Read Only Memory) and DVD-ROM (Digital Versatile Disk-Read Only Memory). Among such optical storage media, a large amount of information of about 700 megabytes (MBytes) per CD-ROM is stored.

A typical optical storage medium includes a plurality of sectors radially partitioned on a disk-shaped storage medium, and a plurality of tracks divided into concentric circles for each sector. The optical storage medium is rotated at an average speed of approximately 720 rpm, and reproduced in a concentric manner from the central portion of the optical storage medium to the outer diameter by the optical reproducing apparatus.

Accordingly, there is a need for an optical reproducing apparatus to quickly detect specific information among a large amount of information stored in an optical storage medium. In recent years, since the research for reproducing an optical storage medium at a high speed is being accelerated, the need for a fast information retrieval is an urgent problem.

In particular, recently, a compact disk-recordable (CDR) drive having a single recordability or a CDW (Compact Disk-ReWritable) which is an optical disk recording and reproducing system capable of multiple recording and reproducing as well as a CD-ROM drive for simply reproducing an optical recording medium. As a storage system such as a drive has become common, a number of recording apparatuses and methods for providing direct access when recording data on an optical disc are provided so that a user can directly access a desired recording position when playing an optical disc. Known.

1 is a block diagram showing a general optical disc recording and reproducing system.

In a typical optical disc recording / reproducing system, as shown in FIG. 1, when a data recording command is applied, a data encoder is set and a video encoder is applied as video data and audio data are applied. 100 and an audio encoder 101 perform data encoding on the video data and the audio data, respectively, and then encode the encoded video data and the audio data on the disc 109 in a synthesized form. To be stored, the data mixer 102 performs data mixing on the video data and the audio data. The synthesized data is added with an address ID on the disk 109 and a parity for address ID correction through a channel encoder 103, and the parity for scrambling and error detection is added. After the data is added, the parity for data error correction is added and finally output after 8 / 16-value modulation. In this case, the data storage 110 is required to perform channel encoding.

The data bitstream output through the channel encoder 103 is not directly recorded on the disk 109, but is optically modulated by the laser power modulator 104 and the recording / playback switching unit ( As 130 is switched to the recording mode, the output of the laser power modulator 104 is recorded on the disc 109 by the optical pickup device 105. The focusing / tracking control of the optical pickup device 105 is performed by the focusing / tracking servo unit 106 and the rotation control of the optical disc is controlled by the spindle servo unit 107 to control the spindle motor unit 108. Is made by.

On the other hand, during data reproduction, the data reproduction process is usually performed in the reverse order of the data recording process.

When a data reproducing command is applied, the recording / reproducing switching unit 130 is switched to the reproducing mode and the optical pickup device 105 optically reads the data recorded on the disc 109. Accordingly, when the high frequency amplifier 111 amplifies the weak read signal output from the optical pickup device 105 with an appropriate gain, the channel decoder 112 performs a reverse process of the channel encoder 103. Error detection and correction are performed based on the set method, and 8-value / 16-value demodulation is performed.

Thereafter, when the data parser 113 separates the output of the channel decoder 112 into video data and audio data, the video decoder 114 and the audio decoder 115 separate the separated video data and the audio. Data decoding is performed on the data, respectively.

Accordingly, the television signal encoder 116 encodes the output of the video decoder 114 into a television video signal such as NTSC, PAL, SECAM, and the like, and displays the video signal through the monitor 118. The digital-to-analog converter 117 digitally / analogs the output of the audio decoder 115 and outputs the same through a speaker 119.

However, since the CDRW has less reflectance than the CDR, when the data of the CDRW or the DVD data is reproduced by the method of reproducing the data of the CDR, the data of the CDRW or the data of the DVD may not be reproduced or the driver may malfunction.

Accordingly, an object of the present invention is to solve such a problem, and an object of the present invention is to detect the type of disc according to the reflectance of the disc, and adjust the position of the optical pickup device according to the detected disc type to adjust the data of the disc. This is to prevent the disc data from being played back or the disc driver malfunctioning due to the use of different types of discs.

1 is a block diagram showing a general disc recording and reproducing system,

2 is an operation flowchart for explaining a disc type determination method according to the present invention;

3 is an exemplary view for explaining the present invention,

4 is an exemplary view illustrating a look-up table of a memory.

<Description of the code | symbol about the principal part of drawing>

S100: storage step S200: light irradiation step

S300: surface reflection wavelength time detection step

S400: S-curve wavelength time detection step

S500 detection step S600 data playback step

A feature of the present invention for achieving these objectives is to fix the optical pick-up device in a vertical position on the disc, until the light of the optical pick-up device is reflected off the surface / pit (PIT) of the disc and the surface reflection wavelength first appears. Storing the disk reflection information according to the S-CURVE wavelength time until the S-CURVE wavelength first appears in the form of a look-up table in the storage medium; Moving an optical pickup device to a vertical position of the disc to count time while irradiating the light to the disc; Detect surface reflection wavelength time; Detecting the S-curve wavelength time; Detecting the type of the disc and the position of the optical pickup device in the look-up table of the storage medium with the disc identification information using the surface reflection wavelength time and the S-curve wavelength time; The optical pickup device is moved to a predetermined position in accordance with the detected disk type to reproduce the data of the disk.

Preferably, the identification information is characterized in that the type of the disk and the position of the optical pickup device according to the difference between the surface reflection wavelength time and the S-curve wavelength time.

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

2 is a flowchart illustrating a method of determining a disc type according to the present invention, FIG. 3 is an exemplary diagram for describing the present invention, and FIG. 4 is an exemplary diagram showing a look-up table of a memory.

According to the present invention, the optical pickup device 105 is fixed to the vertical position of the disk 109, and the light of the optical pickup device 105 is reflected at the surface / pit (PIT) of the disk 109 so that the surface reflection wavelength appears first. The disk reflection information according to the S-CURVE wavelength time until the first appearance of the S-CURVE wavelength and the S-CURVE wavelength is stored in the memory 122 in the form of a look-up table. A storage step S100; A light irradiation step (S200) of moving the optical pickup device 105 to a vertical position of the disk 109 so as to irradiate light to the disk 109 and count time at the same time; A surface reflection wavelength time detection step (S300) of detecting a surface reflection wavelength time; An S-curve wavelength time detection step S400 for detecting an S-curve wavelength time; A detection step (S500) of detecting the type of the disk 109 and the position of the optical pickup device 105 in the look-up table of the memory 122 by using the surface reflection wavelength time and the S-curve wavelength time; And a data reproducing step (S600) of reproducing the data of the disc 109 by moving the optical pickup device 105 to a predetermined position according to the type of the disc 109 detected in the detecting step (S500).

Hereinafter, the operation of the disc type determination method according to the present invention will be described in detail with reference to FIGS. 2 to 4.

First, the optical pickup device 105 is moved to the vertical position of the disk 109, and then the light is irradiated onto the disk 109 to reflect the light emitted from the optical pickup device 105 on the surface of the disk 109. The surface reflection wavelength time t1, which is the time from the irradiation of the light to the first appearance of the surface reflection wavelength, and the light is reflected at the pit PIT of the disk 109 so that the light is irradiated, and then the S-CURVE ) The type of the disk 109 and the position of the optical pickup device 105 according to the difference Δt of the S-curve wavelength time t2 until the wavelength first appears in the form of a look-up table as shown in FIG. 4. In operation S100, the memory 122 is stored in the memory 122.

Then, when the disk 109 is inserted (S120), the central processing unit 120 controls the optical pickup device 105 to move to any position as shown in FIG. 109) and starts counting at the same time (S230).

When the light irradiated onto the disk 109 is reflected on the surface of the disk 109 to detect the surface reflection wavelength (S310), the central processing unit 120 detects the surface reflection wavelength time t1 counted so far and In operation S320, the memory 122 is stored in the memory 122. In addition, when the light irradiated onto the disk 109 is reflected from the pit of the disk 109 to detect the S-curve wavelength (S410), the S-curve wavelength time t2 counted so far is detected and the memory 122 is detected. Author) (S420).

Then, the central processing unit 120 determines the difference between the surface reflection wavelength time t1 and the S-curve wavelength time t2 ( ) To obtain (S510), the obtained car ( Comparing t) with the look-up table of the memory 122 detects the type of the disk 109 and the position of the optical pickup device 105 (S520).

Therefore, the central processing unit 120 moves the optical pickup device 105 to a predetermined position according to the type of the disk 109 detected in the look-up table of the memory 120, and thus the optical processing unit 120 may store the optical signal according to the type of the disk 109. The pickup device 105 is moved to prevent an error from occurring when the disc 109 is played back.

As described above, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

As described above, the present invention detects the type of the disc according to the reflectance of the disc, adjusts the position of the optical pickup apparatus according to the detected type of the disc, and reproduces the data of the disc. There is an effect of preventing data from being played back or malfunctioning of the disk driver.

Claims (2)

The optical pick-up device is fixed at the vertical position of the disk, and the surface reflection wavelength time, which is the time until the light of the optical pickup device is reflected at the surface / pit (PIT) of the disk and the surface reflection wavelength first appears, and the S-curve A storage step of storing the disc identification information according to the S-curve wavelength time until the (S-CURVE) wavelength first appears on the storage medium in the form of a look-up table; A light irradiation step of moving the optical pickup apparatus to a vertical position of the disk to count the time while irradiating the light to the disk; A surface reflection wavelength time detection step of detecting the surface reflection wavelength time; An S-curve wavelength time detecting step of detecting the S-curve wavelength time; Detecting the type of the disc and the position of the optical pickup device in the look-up table of the storage medium by the disc identification information using the surface reflection wavelength time and the S-curve wavelength time; And And a data reproducing step of reproducing the data of the disc by moving the optical pickup apparatus to a predetermined position according to the type of the disc detected in the detecting step. The disc type discrimination method according to claim 1, wherein the identification information is a type of the disc and a position of the optical pickup device according to a difference between the surface reflection wavelength time and the S-curve wavelength time.