KR100532418B1 - Method and apparatus for discriminating DVDRAM disk in disk drive - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc discrimination method and apparatus for a disc drive, and more particularly, to a disc RAM disc discrimination method and apparatus for accurately disclosing a DVDRAM disc in a DVD series.

According to the present invention, by determining the DVDRAM disc using the disc reflection signal in the disc determination mode of the disc drive, the effect of accurately disclosing the DVDRAM disc even when the DVDRAM disc does not use a cartridge is generated.

Description

Method and apparatus for discriminating DVDRAM disk in disk drive}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc discrimination method and apparatus for a disc drive, and more particularly, to a disc RAM disc discrimination method and apparatus for accurately disclosing a DVDRAM disc in a DVD series.

In general, an optical disc of a disc drive can be roughly divided into a compact disc (CD) series and a digital versatile disc (DVD) series, and the DVD series includes DVDROM, DVDR, DVDRW, and DVDRAM in detail.

However, since information recording and reproducing standards are different and disc reflectances are different according to the disc type, various parameters of the drive must be set differently according to the disc type.

Therefore, in order to reproduce the signal recorded on the disc or to record the signal in the disc drive, it is necessary to first determine the type of the disc mounted in the disc drive.

According to the prior art, CD-based discs and DVD-based discs are discriminated using time difference information from which surface reflections and S curves are detected due to differences in the pitch of recording tracks and the like.

By the way, in the DVD series, discs such as DVDRAM discs and DVDRWs do not have a large difference in recording track pitch, so it is very difficult to determine the type of disc using the difference in track pitch.

In general, a disc such as a DVDRW is not contained in a cartridge, whereas a DVDRAM disc has a structural characteristic in a cartridge. In the conventional technology, a disc such as a DVDRW and a DVDRAM disc are distinguished by using a structural difference of the presence or absence of such a cartridge. It was.

However, in the future, DVDRAM discs also tend not to use cartridges to reduce material costs. Thus, when a cartridge is not used in a DVDRAM disc, a DVDRW disc and a DVDRAM disc cannot be discriminated using conventional techniques. There was this.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a disc drive DVDRAM disc determination method and apparatus for discretion of a DVDRAM disc in a DVD series using a reflection signal of a disc regardless of the presence or absence of a cartridge in order to solve the above problems. .

In order to achieve the above technical problem, according to the present invention, a disc drive DVD disc disc determination method includes: (a) detecting a number of headers per unit rotation of a disc from a predetermined signal in a disc disc determination mode; (B) comparing the number of headers detected in step (a) with a predetermined threshold value; and (c) if the number of headers as a result of the comparison in step (b) exceeds a predetermined threshold value. Determining the loaded disc as a DVDRAM disc.

In accordance with another aspect of the present invention, there is provided a disc drive apparatus for determining a DVDRAM of a disc drive, comprising a laser diode, a photodiode, and various lenses, and recording a signal onto a disc or reflecting an optical signal from the disc. A filter for detecting a signal, a pickup for generating a predetermined signal for signal processing and servo control, a predetermined signal generated by the pickup, and passing through a frequency band in which a header signal exists, and outputting the filter. Comparing the signal with a predetermined threshold voltage, a comparator for generating a square wave signal in a section exceeding the threshold voltage, generates a control command for controlling the system in a mode corresponding to the input key value, in the disc determination mode The output signal of the comparator is input to the phrase for a predetermined unit time. The system control unit and the servo control which count the number of waves and determine the loaded disc as a DVDRAM disc when the counting value exceeds a predetermined threshold value and determine the disc related parameters of the disc drive according to the determined result And a servo controller for controlling the movement of the pickup and the rotation of the disk in response to a control command of the system controller.

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

As shown in FIG. 2, the disk drive to which the present invention is applied includes a disk 10, a pickup 20, an RF signal processor 30, an optical driver 40, an encoder 50, and a digital signal processor 60. And a high pass filter (HPF) 70, a comparator 80, a system controller 90, a servo controller 100, a driver 110, a spindle motor 120, and a sled motor 130.

First, the operation of each component is as follows.

The pickup 20 is composed of a laser diode, a plurality of photodiodes, various lenses, and an actuator for moving the lens in a horizontal / vertical direction, and projects the optical signal onto the disk and detects the optical signal reflected from the disk. Run In particular, a plurality of photodiodes are combined, and these signals are combined to generate a track error signal T.E and a focus error signal F.E for servo control, and also generate a signal used for signal processing.

The RF signal processing unit 30 converts the signal processing signal detected by the pickup 20 into a binary signal and then outputs the converted signal to the digital signal processing unit 60.

The optical driver 40 outputs a light quantity driving signal according to the input signal in the recording mode, and outputs a driving signal for generating a constant level of laser power in the reproducing mode.

The encoder 50 reconverts the data converted into the recording format by the digital signal processing unit 60 into a bitstream and outputs the data to the optical driver 40.

The digital signal processing unit 60 executes signal processing for restoring the binary signal input from the RF signal processing unit 30 to the original data by the phase-locked clock in the reproduction mode, and corrects the error in the digital data input in the recording mode. A signal process is executed in which a code (ECC) or the like is added and converted into a recording format.

The servo controller 100 generates an actuator driving voltage of the pickup 20 for controlling the pickup 20 in the horizontal or vertical direction by using the track error signal and the focus error signal, and picks up the target track in the seek mode ( A driving voltage of the sled motor 130 for moving 20 is generated. Then, a driving voltage of the spindle motor 120 is generated to rotate the disk at a speed corresponding to the set double speed.

The driver 110 generates a drive current for driving the spindle motor 120 and the sled motor 130 according to the driving voltage generated by the servo controller 100, and focuses and tracks the optical lens of the pickup 20. To generate an actuator driving current of the pickup 20 for controlling.

The high pass filter 70 inputs the track error signal generated by the pickup 20, and passes only the high frequency band component in which the header signal exists to detect the header signal when the loaded disc is a DVDRAM disc.

That is, in the DVDRAM disc, when only focus control is turned on, a high frequency header signal is included in the track error signal as shown in FIG. Accordingly, when the disk loaded and rotated in the disk drive is a DVDRAM disk, the high pass filter 70 outputs a header signal as shown in FIG.

The comparator 80 sets the upper limit voltage UP_MON and the lower limit voltage DN_MON, and the voltage of the signal input from the high pass filter 70 is greater than the upper limit voltage or lower than the lower limit voltage. As shown in FIGS. 3 (b) and 3 (c), a square wave signal is generated. Here, the upper limit threshold voltage and the lower limit threshold voltage are levels for detecting the header signal and are set lower than the level of the header signal, and are determined in consideration of the noise level.

Although the comparator 80 according to an embodiment of the present invention is designed to detect both the positive (+) and the negative (−) header signals, in some cases, the circuit may be configured to detect only the positive or negative polarity header signals. You can also design.

The system controller 90 collectively controls the disk drive to suit the mode set according to the key input. In particular, when the disc is loaded, the disc discrimination mode is executed. In the DVD disc discrimination mode, the disc is discriminated as follows with the focus control turned on.

That is, the system controller 90 counts the number of square wave signals detected by the header signal input from the comparator 80 per unit rotation of the spindle motor 120, and then compares the counted square wave with a threshold value. When the number of square waves counted exceeds the threshold, the loaded disc is determined as a DVDRAM disc, and the parameters related to the disc are determined in accordance with the DVDRAM disc specification. Parameters related to the disk include laser power, coefficients of various filters, and the like.

The DVDRAM disc can detect 59 header signals in the inner circumference (ZONE 0) and the 25 outer circumferences (ZONE 34) in one rotation. The threshold value needs to be set in consideration of noise. As an example, the threshold may be set to 18 when the disc is determined in the inner circumference.

In addition, the system controller 90 may determine the first rotation of the spindle motor 120 using the frequency generator (FG) signal output from the spindle motor 120.

Next, a DVDRAM disc discrimination method according to the present invention will be described in detail with reference to the flowchart of FIG. 4.

First, it is determined whether the disc drive is a DVD series disc discrimination mode (step 410). When a disc is loaded, the disc drive first determines whether the disc is a CD disc or a DVD disc. If the disc drive determines that the disc is a DVD disc, the disc drive disc determination mode is executed.

As a result of the determination in step 410, in the DVD series disc discrimination mode, the focus control is turned on, and the pickup 20 is moved inward (step 420).

Then, the number of headers Nd per unit revolution in the disc inner circumference is detected (step 430). For example, the header signal may be detected using a comparator after high pass filtering the track error signal, and the number of header signals may be obtained by connecting a counter to the comparator.

After detecting the header number Nd per unit rotation, the threshold value Nth is compared with the detected header number Nd (step 440). The threshold value Nth is set to a value obtained by subtracting a certain margin from the number of headers in the disk area for detecting the header.

When the detected number of headers Nd exceeds the threshold value Nth as a result of the determination in step 440, the loaded disk is determined to be a DVDRAM disk, and parameter values related to the disk are determined according to the DVDRAM disk specification (step 450, Step 460).

However, if the detected number of headers (Nd) does not exceed the threshold value (Nth) as a result of the determination in step 440, since the loaded disk is not a DVDRAM disk, a process for determining whether the disk is a DVDROM, DVDRW, DVDRW disk is performed. To execute (step 470).

In an embodiment of the present invention, the track error signal is used as a signal for detecting the header signal. However, the present invention is not limited thereto, and a signal processing signal may be used.

The invention can be practiced as a method, apparatus, system, or the like. When implemented in software, the constituent means of the present invention are code segments that necessarily perform the necessary work. The program or code segments may be stored in a processor readable medium or transmitted by a computer data signal coupled with a carrier on a transmission medium or network. Processor readable media includes any medium that can store or transmit information. Examples of processor-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memory, erasable ROM (EROM), floppy disks, optical disks, hard disks, optical fiber media, radio frequency (RF) networks, Etc. Computer data signals include any signal that can propagate over transmission media such as electronic network channels, optical fibers, air, electromagnetic fields, RF networks, and the like.

Specific embodiments shown and described in the accompanying drawings are only to be understood as an example of the present invention, not to limit the scope of the invention, but also within the scope of the technical spirit described in the present invention in the technical field to which the present invention belongs As various other changes may occur, it is obvious that the invention is not limited to the specific constructions and arrangements shown or described.

As described above, according to the present invention, by determining the DVDRAM disc using the disc reflection signal in the disc determination mode of the disc drive, even if the DVDRAM disc does not use a cartridge, the effect of accurately determining the DVDRAM disc is generated. .

1 is a block diagram of a disk drive to which the DVDRAM disk discrimination apparatus according to the present invention is applied.

2 is a waveform diagram of a track error signal including a header signal detected by rotating a DVDRAM disc when only focus control is turned on.

3A, 3B, and 3C are waveform diagrams of main signals applied to the present invention.

4 is a flowchart of a DVDRAM disc discrimination method of a disc drive according to the present invention.

Claims (8)

In the disk determination method loaded in the disk drive, (a) detecting the number of headers per unit revolution of the disc in the disc circumference from a predetermined signal in the disc determination mode; (b) comparing a threshold value obtained by subtracting a predetermined margin from the number of headers detected in step (a) and the number of headers in the disk area detecting the header; And and (c) determining that the loaded disk is a DVDRAM disk when the number of headers as a result of the comparison in step (b) exceeds the threshold value. The method of claim 1, wherein in the disc determination mode, only focus control is turned on. The method of claim 1, wherein the predetermined signal includes a track error signal. The method of claim 1, further comprising determining disk-related parameters of the disk drive in accordance with the determination result of step (c). In the disk drive, A pickup consisting of a laser diode, a photodiode and various lenses, for picking up a signal on a disk or detecting an optical signal reflected from the disk, and generating a predetermined signal for signal processing and servo control; A filter for inputting a predetermined signal generated by the pickup at the inner circumference of the disc, and passing the frequency band in which the header signal exists to output the filter; A comparator for comparing the output signal of the filter with a predetermined threshold voltage to generate a square wave signal in a section exceeding the threshold voltage; Generates a control command for controlling the system in a mode corresponding to the input key value, inputs an output signal of the comparator in a disc discrimination mode, counts the number of square waves for a predetermined unit time, and counts the header to a count value. A system controller for determining the loaded disk as a DVDRAM disk when the number of headers in the detected disk area is subtracted from a predetermined margin, and determining disk related parameters of the disk drive according to the determined result; And And a servo control unit for controlling the movement of the pickup and the rotation of the disc in response to a control command of the system control unit by inputting a signal to the servo control. The apparatus of claim 5, wherein the filter is designed as a high pass filter. The apparatus of claim 5, wherein the comparator sets an upper limit voltage and a lower limit voltage and generates a square wave signal in a section in which the voltage of the input signal is greater than the upper limit voltage or lower than the lower limit voltage. DVDRAM disk discrimination apparatus of a disk drive, characterized in that. The apparatus of claim 5, wherein the predetermined signal input to the filter includes a track error signal.