KR100851907B1 - Method of measurement physical address detection-rate for optical disc, and the optical disc therefor - Google Patents

Abstract

An apparatus and a method for measuring a physical address detection rate for an optical disk are provided to count a set time from the time a physical address is read, using a timer, and to compare the physical address with a reference address for measuring a detection rate, thereby detecting LPP(Land Pre Pit) or ADIP(Address In Pre Groove) accurately. A method for measuring a physical address detection rate for an optical disk comprises: controlling CLV(Constant Linear Velocity) when starting searching an optical disk(S101); moving the optical pickup to a set position(S102); detecting a physical address for a set time(S103); operating a timer from the time the physical address is read to count the set time(S104); stopping the drive of the optical pickup to prevent the physical address from being detected(S105); counting the detected physical address for a set time(S106); and comparing the physical address with a reference address to measure a detection rate(S107).

Description

Apparatus and method for measuring physical address detection rate of optical disc {Method of measurement physical address detection-rate for optical disc, and the optical disc therefor}

1 is a flowchart of a method for measuring a physical address detection rate of an optical disk according to the prior art;

2 is a block diagram of an apparatus for measuring a physical address detection rate of an optical disk according to an embodiment of the present invention;

3 is a flowchart illustrating a method of measuring a physical address detection rate of an optical disc according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

1: optical disc 10: optical pickup

20: RF unit 30: servo unit

40: signal processor 50: microcomputer

60: spindle motor 70: timer

The present invention relates to an apparatus and method for measuring the physical address detection rate of an optical disc, and more particularly, to calculate the detection time based on the time required for reading a predetermined block, and to measure the detection rate based on this. The present invention relates to an apparatus and method for measuring a physical address detection rate of an optical disk that can be increased.

A physical address is an address that points to a unit of data on a disc using elements such as physical device number, cylinder number, page number, sector or block number, and is used to develop DVD-R / RW and + R / RW disc recording and playback devices. Reading the physical address of the disc (Land Prepit (LPP) for DVD-R / RW and Address In Pre Groove (DVD) for DVD + R / RW) is very important.

Therefore, the drive manufacturer measures the detection rate of the physical address by measuring the performance of the set. The recording disk can be measured based on the DID (address stored with the proxy data). Since there is no DID that can be used as a reference, its value cannot be trusted, and thus the reliability of an unrecorded disc is insufficient.

That is, when measuring the detection rate of the physical address of the recording disk, the CLV control is started using the recorded optical disk and then the optical pickup is moved to a specific position (S1).

In the following process, we assume that we want to detect the physical address for 1000 blocks to determine the best value by measuring the LPP detection rate by changing the two values to determine the LPP balance and slice level. The number of physical addresses obtained by reading the physical address of 1000 blocks and the number of physical addresses treated as an Error Correction Code (ECC) error (S2), and the detection rate based on the physical addresses read by 1000 blocks Calculate (S3).

In the disk recorded as above, the recording disk has a reference value when measuring the detection rate of the physical address based on the DID, so the value of the detection rate can be relied on. If the physical ID cannot be read because it is measured while changing, there is no reference value, so it is not known whether a valid physical address has been read within a given block. Therefore, in the case of an unrecorded disc, it is difficult to secure reliability in measuring the detection rate.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and an object of the present invention is to calculate the time taken when reading a predetermined block and to measure the detection rate based on the detection rate of the LPP and ADIP in an unrecorded optical disc. The present invention provides an apparatus and method for measuring the physical address detection rate of an optical disc, which can increase the reliability of the measurement and improve the accuracy in the performance evaluation of the optical recording and reproducing apparatus.

Technical means according to the present invention for achieving the above object is an optical pickup for detecting the physical address of the optical disk; The optical pickup is controlled to move to a predetermined position, the number of physical addresses detected for a predetermined time through the optical pickup is counted, and the detection rate of the physical addresses is compared with the number of reference physical addresses according to the predetermined time. Micom; And a timer for counting a predetermined time from the start point of detection of the physical address according to the instruction of the microcomputer.

The technical method according to the present invention for achieving the above object is to move the optical pickup to a predetermined position of the optical disk, and to detect the physical address for a predetermined time from the time when the physical address of the optical disk is detected, the physical address detected The number of times is counted and the detection rate is measured by comparing the reference physical address number with the detected physical address number according to the predetermined time.

According to the present invention, physical address detection such as LPP or ADIP can be precisely found in an unrecorded disk, and the correspondence to an unrecorded disk can be enhanced.

In addition, with the physical address detection rate such as LPP or ADIP, the accuracy of performance evaluation of the optical disc recording and reproducing apparatus can be improved, and the reliability of measuring the physical address detection rate such as LPP or ADIP of the unrecorded disc as well as the recording disc can be improved.

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

2 is a block diagram of an apparatus for measuring a physical address detection rate of an optical disc according to an exemplary embodiment of the present invention, which includes an optical disc 1, an optical pickup 10, an RF unit 20, a servo unit 30, and a signal processing unit 40. , Microcomputer 50, spindle motor 60, and timer 70.

The optical disc 1 is a storage medium in which data can be recorded and reproduced by laser light, and a low density optical disc such as a compact disc (CD) or a digital versatile disc (DVD), and a Blu-ray Disc Recordable / Rewritable (BD) It includes high density optical discs such as HD-DVD (High Density DVD), and low density optical discs include play-only types such as CD, CD-ROM, DVD-ROM, and MD, CD-R, CD-RW, DVD-R, DVD. There are recordable types such as -RW, DVD + RW and DVD Random Access Memory (DVD-RAM).

In addition, the optical disc 1 is driven to rotate by the spindle motor 60, the spindle motor 60 is rotated by the motor drive (not shown) is controlled by a drive signal generated from the microcomputer 50.

The optical pickup 10 irradiates laser light to the surface of the optical disc 1 to record data on tracks or to receive reflected light reflected from the surface of the optical disc 1 to output an RF signal. A laser diode, a photodiode for receiving reflected light reflected from the optical disc 1 and converting the light into an electrical signal, and a laser beam irradiated from the laser diode are focused to spot a spot on the optical disc 1. An objective lens to be formed, and an actuator for moving the vertical position of each objective lens.

In addition, the optical pickup 10 records data on the optical disc 1 by irradiating a recording surface of the optical disc 1 with a laser of power corresponding to the recording power via a laser diode, and transmits a laser of power corresponding to the reproduction power to the optical disc 1. ), The data recorded on the optical disc 1 is reproduced (read).

In this case, the optical disk includes an optical path for recording and reproducing data, and although not shown in the drawing, the optical path includes a collimator lens for converting divergent light into parallel light, a beam splitter for splitting incident light, and the like. In this manner, the optical pickup 10 can record data on the optical disc or reproduce data recorded on the optical disc 1 using the optical path.

The RF unit 20 generates a laser from a laser diode in the optical pickup 10 and transmits the laser beam irradiated onto the recording surface of the optical disc 1 to be reflected from the data recording surface of the optical disc 1. Focus signal (Focus Error, FE) signal, which detects out of focus, and track error (Track Error, TE) signal, which converts electrical signals into RF signals, which are reproduction data, and amplifies RF signals. Create

The servo unit 30 refers to a focus error signal FE transmitted from the RF unit 20, a track error signal TE, and a spindle error signal transmitted from the microcomputer 50, and the like. A drive signal for the spindle is generated and the tracking and focus of the optical pickup 10 is controlled by referring to the tracking error signal and the focus error signal.

The signal processor (DSP) 40 receives the high frequency signal amplified by the RF unit 20, restores the converted digital signal, and transmits the converted signal to the microcomputer 50.

The microcomputer 50 controls the optical pickup 10, the RF unit 20, the servo unit 30, and the signal processor 40 according to a user's input command.

That is, the microcomputer 50 controls the actuator of the optical pickup 10 to measure the focus error signal generated by moving the laser diode and the objective lens up and down.

The microcomputer 50 controls the CLV when the search of the optical disk 1 starts after the optical disk 1 is loaded in the optical disk device, and controls the optical pickup 10 to move the optical pickup 10 to a preset position. .

Here, CLV (Constant Linear Velocity) is a method of controlling the speed with the distance that the optical disc 1 rotates per hour. That is, the microcomputer 50 controls the rotation speed of the spindle motor 60 by controlling the CLV.

In addition, the microcomputer 50 controls the driving of the optical pickup 10 for a predetermined time from the time when the physical address (that is, the address) is read, and controls the driving of the timer 70 for counting the predetermined time.

Here, the predetermined time is a time for setting the calculated time after calculating the time taken to detect the physical address of the block of the predetermined section based on the specification of the optical disc 1.

In addition, when the elapsed signal of a predetermined time is input from the timer 70, the microcomputer 50 stops the driving of the optical pickup 10, and compares the number of addresses detected during a predetermined time with the reference address corresponding to the predetermined time. To calculate the detection rate of the physical address.

Here, the reference address number corresponding to a predetermined time is stored in the microcomputer 50 or a separate memory (not shown) as a table.

That is, the microcomputer 50 measures the physical address detection rate such as LPP or ADIP of the unrecorded optical disk, specifies the section to be measured and the number of blocks, moves the optical pickup to the start point of the section to be measured, and the block of the section to be measured. The detection time is measured based on the number of physical addresses detected during a predetermined time calculated by calculating the time taken to detect the physical address.

The spindle motor 60 rotates the tray on which the optical disc is placed in accordance with the control signal of the microcomputer 50.

The timer 70 counts a predetermined time according to the instruction of the microcomputer 50 and transmits a signal to the microcomputer 50 indicating that the predetermined time has elapsed when the predetermined time elapses.

3 is a flowchart of a method for measuring a physical address detection rate of an optical disc according to an embodiment of the present invention, with reference to FIG.

First, when the optical disk is loaded after the optical disk is loaded into the optical disk recording and reproducing apparatus, the CLV (Constant Linear Velocity) is controlled (S101) to control the rotation speed of the spindle motor 60, and the actuator to control the laser diode and the like. While moving the objective lens up and down, the optical pickup 10 is moved to a predetermined position (S102).

Next, the optical pickup 10 is driven to detect the physical address from the time when the physical address (that is, the address) is detected. At this time, the physical address is detected for a predetermined time (S103), and the predetermined time is the timer 70. Counted by

That is, after the predetermined time is counted by operating the timer 70 from the time at which the physical address is read (S104), when a predetermined time is counted, a signal indicating that the predetermined time has elapsed is input from the timer 70, and at this time, the optical pickup 10 The operation of the device is stopped to prevent the detection of the physical address (S105).

Next, the physical address detected for a predetermined time is counted (S106) and the detection rate is measured by comparing with the reference address according to the predetermined time (S107).

Here, the predetermined time is a time that is calculated after calculating the time taken to detect the physical address of the block of the predetermined section based on the specification of the optical disk 1, and the number of reference addresses corresponding to the predetermined time is a microcomputer as a table. 50 or a separate memory (not shown).

In more detail, the calculation of a predetermined time when measuring the physical detection rate, such as LPP or ADIP of an unrecorded disk is as follows.

Since one bit is 0.133 um in length and one sector is 38688 bit,

One sector length is 0.133 um * 38688 = 0.005145504 m,

Since one block is 16 sectors,

The length of one block is 0.005145504 m * 16 = 0.082328064 m,

Since the reference scanning velocity is 3.49 m / s based on 1X (1X),

The time it takes to pass one block is

0.082328064 / 3.49 (m / s) = 0.0235897 sec,

As a result, the time taken to pass one block at double speed (2X) is

0.0235897 (sec) / 2 = 0.01179485 sec.

Therefore, when you want to detect a physical address such as LPP or ADIP of 1000 blocks from 0x30000 at 2X (2X),

The time it takes to pass 1000 blocks is

0.01179485 * 1000 = 11.79485 sec.

Accordingly, the optical pickup is moved to a position of 0x30000 determined according to the set of optical disks, and then a physical address such as LPP or ADIP is detected. At this time, the timer is operated to count the set time (11.79485 sec), and the physical address detected during the predetermined time (11.79485 sec) when the timer is operated is counted.

Next, when the set time elapses, the operation of the optical pickup is stopped, and the detection rate is measured by comparing the detected physical address with a reference physical address according to a predetermined time (11.79485 sec) set in the microcomputer's table.

Accordingly, the reliability of measuring physical address detection rate such as LPP or ADIP in an unrecorded disk can be improved, and accuracy can be improved when evaluating performance of an optical disk recording and reproducing apparatus.

The present invention is not limited to the above-described embodiments, and various changes can be made by those skilled in the art without departing from the gist of the present invention as claimed in the following claims.

As described in detail above, the present invention can accurately find a physical address detection such as LPP or ADIP in an unrecorded disk, and can increase the responsiveness to an unrecorded disk.

In addition, with the physical address detection rate such as LPP or ADIP, the accuracy of performance evaluation of the optical disc recording and reproducing apparatus can be improved, and the reliability of measuring the physical address detection rate such as LPP or ADIP of the unrecorded disc as well as the recording disc can be improved.

Claims (7)

Optical pickup for detecting a physical address of the optical disk; The optical pickup is controlled to move to a predetermined position, and the number of detected physical addresses is counted during the time required to detect the physical address of a block determined according to the specification of the optical disk through the optical pickup, and then A microcomputer for comparing the detection rate of the physical addresses with the number of reference physical addresses; And And a timer for counting the time from the start point of detection of the physical address according to the instruction of the microcomputer. The method of claim 1, wherein the physical address is The physical address detection rate measuring apparatus of the optical disk, characterized in that any one of the LPP (Land Pre Pit) of the DVD-R / RW or ADIP (Address In Pre Groove) of the DVD + R / RW. delete The method of claim 1, And a spindle motor for rotating the optical disc, wherein the spindle motor rotates according to the control speed of the microcomputer's constant speed (CLV). Move the optical pickup to a predetermined position on the optical disc, The number of detected physical addresses is counted by detecting the physical address for a time taken to detect the physical address of the block determined according to the specification of the optical disk from the time when the physical address of the optical disk is detected, And a detection rate is measured by comparing the reference physical address number with the detected physical address number over time. delete The method of claim 5, wherein the moving the optical pickup comprises: And controlling a predetermined speed CLV of the optical disc.

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