KR100288793B1 - Track approach in the lead-in area - Google Patents

Abstract

According to the present invention, when the position where the optical pickup is moved in the track from the optical disc to the target track is the lead-in area instead of the desired target track, the present invention in the lead-in area is based on the absolute time information at the end position of the lead-in area. A track approach method in a lead-in area for calculating a separation distance from a position to a target track in a data area and allowing the optical pickup to move by the calculated separation distance. A first step of confirming that the current position is a lead-in area; A second step of calculating a separation distance from a current lead-in area position to the target track based on absolute time information at a lead-in area end position when the lead-in area is confirmed; And a third step of moving the track according to the calculated separation distance, wherein the optical pickup jumps to the target track at a time by the separation distance calculated at the current position. It is a very useful invention that makes it possible to move.

Description

Track approach in the lead-in area

The present invention relates to a track approach method of an optical disc, and more particularly, when the track movement position of an optical pickup is a lead-in area other than a desired target track when moving from an optical disc to a target track, Based on Absolute Time In Pre-groove (ATIP), the separation distance to the target track is calculated more accurately, and the optical pickup is moved by the calculated separation distance, thereby allowing the optical pickup to move within the data area. The present invention relates to a track approach method in a lead-in area capable of accessing a target track at high speed.

In general, an optical disk player includes: an optical pickup (3) for detecting a signal recorded on the optical disk (1) by generating a light source through a light emitting diode (LED) as shown in FIG. Sled motor (4) for moving the optical pickup (3) in the radial direction of the optical disk; A spindle motor 2 for driving the optical disk 1 to rotate; A driver (6) for driving the sled motor (4) and the spindle motor (2); A filter shaping portion (R / F) 5 for filtering the signal detected by the optical pickup (3); The driving of the driving unit 6 is controlled from the rotational speed of the optical error disk and the focus error signal FE and tracking error signal TE output from the optical pickup 3, A servo unit 7 for detecting synchronization of the output signal of 5); A digital signal processor (8) for performing signal processing such as error correction (ECC) and EFM demodulation (or 8-16 demodulation) after recovering the filtered signal to a digital signal using the detected synchronization; A controller 11 for controlling data flow between the components; And a memory 12.

Referring to FIG. 2, which is the flow of the track access method of the optical disc, with reference to the optical disc player of FIG.

First, when the reproduction mode of the optical disc 1 is set at the user's request, the control unit 11 controls the servo unit 7 to drive and control the rotational speed of the spindle motor 2 to reach a predetermined rpm. The sled motor 4 is drive controlled so that 3) can access the lead-in area located at the innermost circumference of the optical disc 1 (S01). At this time, the controller 11 reads out playback control information (reproducing optical power, etc.) from the lead-in area of the optical disc 1 and stores it in the memory 12 (S02). .

The optical pickup 3 detects a signal recorded on the optical disk 1 continuously while moving on the track of the optical disk 1, and the filter shape section 5 detects the optical pickup 3 by detecting the signal. Filter the high frequency signal. Synchronization is detected by the servo unit 7 in the filtered shaping signal, and the digital signal processing unit 8 is outputted from the filtering shape unit 5 by the synchronization detected by the servo unit 7. EFM demodulates the high frequency signal into 8 bits of data and then performs ECC decoding to correct errors in the data.

During the above playback, if a track movement request by the user is input (that is, when the user request for the optical pickup 3 to play a track at a position different from the current playback track), the controller 11 In the control data output from the digital signal processor 8, current position information of the optical pickup 3 is detected to calculate a track number corresponding to the detected position information. At the same time, the control unit 11 calculates the track number of the target track requested to be moved, calculates the difference between the track number of the current position and determines the number of tracks to be moved and the moving direction (S04).

When the movement direction and the number of tracks to be moved are calculated as described above, the controller 11 controls the drive unit 6 through the servo unit 7 so that the optical pickup 3 is moved by the calculated number of tracks. The driving current is output to the sled motor 4, and thus, the sled motor 4 rotates by the current applied time to move the optical pickup 3 to the target track (S05).

After the optical pickup 3 is moved by the calculated number of tracks by the rotational drive of the sled motor 4, information data is read at the moved position to confirm whether the target track is the movement requested (S06). If not, the control unit 11 determines whether the current position moved by the control data output from the digital signal processing unit 8 (if the seventh data of subQ = 0, the current position is the lead-in area) is the lead-in area. It will be confirmed (S07).

When it is determined that the moved current position is the lead-in area, the controller 11 repeatedly moves the optical pickup 3 into the data area where the target track is located by a predetermined number of tracks (S08). The control data (subQ 7th data) repeatedly checks whether or not the optical pickup has entered the data area (S07).

Accordingly, when it is confirmed that the optical pickup 3 has entered the data area, the controller 11 calculates the number of spaced tracks from the current position in the data area to the target track by the same process as described above. After the optical pickup 3 is moved by a number, the operation is repeated until the current position is determined to be the target track to which the movement is requested. Thereafter, a fine search process of rereading track information is performed, and thus the movement to the target track is completed.

However, in the track access method of the conventional optical disc as described above, when the optical pickup 3 enters the lead-in area as in the above-described example, the optical pickup 3 moves to the target track. Since the process of calculating the number of tracks from the lead-in area in which (3) is currently located to the data area in which the target track is located is not easy, the singer control unit 11 repeats the optical pickup 3 by a predetermined number of tracks regardless of the current position. While moving, it is checked whether the lead-in area is out of the lead-in area. Even after the optical pickup 3 is out of the lead-in area by this process, the short jump operation between the tracks in the data area is performed again. Re-entry into the lead-in area has occurred, resulting in a prolonged track access time and a delay in data read time.

Accordingly, the present invention was created to solve the above problems, and based on the absolute time information at the end position of the lead-in area when the lead-in area is entered when the target track approaches the optical track by optical pickup, It is an object of the present invention to provide a track access method in a lead-in area that directly calculates the number of spaced tracks from a current position in the in-area to a target track in the data area.

1 is a configuration diagram of a general optical disc player,

2 is a flowchart of a conventional optical disc track approach.

3 is a flowchart of a track access method in a lead-in area according to an embodiment of the present invention.

FIG. 4 shows the correlation between the optical disc radius r and absolute time information when the optical disc is a CD-R or CD-RW or multi-session.

Explanation of symbols for main parts of the drawings

1: optical disc 2: spindle motor

3: optical pickup 4: sled motor

5: Filtering part (R / F) 6: Driving part (DRV)

7: Servo unit 8: Digital signal processing unit

11: control unit (MICOM) 12: memory (MEMORY)

In the track access method in the lead-in area according to the present invention for achieving the above object, in the track access method of the recordable optical disc, the current position moved when the optical pickup is moved to the target track, the lead-in (lead) -in) a first step of identifying a region; A second step of calculating a separation distance from a current lead-in area position to the target track based on absolute time information at a lead-in area end position when the lead-in area is confirmed; And a third step of moving the track according to the calculated separation distance.

According to the track access method in the lead-in area according to the present invention as described above, if it is determined that the moved position is the lead-in area on the optical disc instead of the target track after the optical pickup moves to the target track according to the track movement request, Based on the absolute time information at the end point of the in-region, calculating the separation distance from the current position in the lead-in area to the target track and allowing the optical pickup to move the track in correspondence with the calculated separation distance, thereby abnormally entering the track. The fast track movement is performed from the current position in the lead-in area to the target track in the data area.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, preferred embodiments of a track approach method in a lead-in area according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a flowchart of a track approach method in the lead-in area according to the present invention. Hereinafter, the flow of FIG. 3 will be described in detail with reference to the configuration of the optical disc player of FIG.

First, after normal initial driving of the inserted optical disc 1 (S11), the control unit 11 reads out reproduction control information read from the lead-in area of the optical disc 1, for example, reproduction optical power (power) ) Is stored in the memory 12 (S12), where the optical disc 1 is a CD-R (writable optical disc) or CD-RW (rewritable optical disc). The absolute time information is recorded together with the end position.

If the track movement from the current position of the optical pickup 3 to the target track is requested by the user in the same manner as before, after the initialization process is performed (S13), the control unit 11 controls the digital. Based on the information data output from the signal processor 8, the current track number of the optical pickup 3 and the number of target tracks requested to be moved are calculated, and the number of spaced tracks is calculated based on the difference between the two track numbers (S14). ).

Thereafter, the control unit 11 moves the optical pickup 3 by the calculated number of tracks by controlling the driving unit 6 through the servo unit 7 (S15) and the optical pickup 3 By reading the control data from the moved position by the) to determine whether the current position is the target track to be moved (S16).

Thus, if the position of the current optical pickup 3 moved as in the prior art is not the target track and the current position is the lead-in area again by the reproduction control information stored in the memory 12 (S21), the The controller 11 detects the absolute time information corresponding to the end position of the lead-in area read and stored from the optical disc 1 in the initialization process (S22). Subsequently, the control unit 11 detects the absolute time information at the current position from the control data read out by the optical pickup 3, and the control unit 11 detects the absolute time information at the difference between the detected absolute time information. The number of corresponding first spaced tracks is calculated (S23).

That is, as shown in FIG. 4, the absolute time information of the lead-in area end point position P read and stored in the initialization process of the optical disc 1 is 99.97, and the position P1 of the current optical pickup 3 is moved. If the corresponding absolute time information is 56.11, the distance distance (99.97-56.11 = 43.86) obtained therefrom is 43.86, and the number of first spaced tracks [43.86 ÷ (1 track play time) = a] calculated accordingly is a Will be.

Further, the control unit 11 uses the absolute time information of the detected lead-in area end point position and the absolute time information on the target track obtained from the control data read out by the optical pickup 3, and thereby the lead-in area. The number of second spaced tracks to which the optical pickup 3 should move from the end position to the target track is calculated (S24). This is because the absolute time of the lead-in area end point position P is differently applied in the lead-in area and the data area as shown in FIG. The absolute time information is 0 (where the absolute time information of the end position of the lead-in area in the lead-in area is 99.97). When the absolute time information of the target track P2 is 200, the distance to be obtained (200-00.00 = 200.00) is 200.00, and the number of second spaced tracks [200.00 ÷ (1 track play time) = b] calculated accordingly is It becomes b.

Thus, by adding the number of the first and second spaced tracks calculated as described above (a + b = c) from the current position P1 of the optical pickup 3 to the target track P2 in the data area in the lead-in area. The total number of spaced tracks c is calculated (S25).

Thereafter, the controller 11 moves the optical pickup 3 by the calculated total number of spaced tracks c in the target track direction (S26), and the optical pickup 3 moves to the target track P2. If arrival is confirmed (S16), a fine search process of rereading track information is performed, and then the movement to the target track is completed.

On the other hand, the play time information of the end position of the lead-in area as in the above-described example is included not only when the optical disc is a CD-R or CD-RW but also when it is a multi-session, where the optical disc 1 is lead-in. In the case of a multi-session including a plurality of sessions including in, data, and lead-out areas, each session lead of the optical disc 1 is read. The reproduction control information of the end point of the in-area area is first stored in the innermost peripheral PCA (Power Calibration Area) or PMA (Program Memory Aera) of the optical disc 1 until all data is recorded in the session. Upon completion, the playback control information stored in the PCA and PMA is recorded in the lead-in area in the session.

Accordingly, when the track pickup is requested while the optical pickup 3 is recording data in the session, the same process as in the above example is performed, but the reproduction control information is read from the PCA or PMA of the optical disc. When the track pickup is requested when the optical pickup 3 completes data recording in the session, the reproduction control information is read out from the corresponding lead-in area in the session.

In the track access method in the lead-in area according to the present invention as described above, when the optical disc is a CD-R or CD-RW or multisession, the optical disc is used by using the absolute time information (ATIP) at the end point of the lead-in area. Even if the lead-in area is abnormally entered during the track movement by pickup, the number of spaced tracks from the current position in the lead-in area to the target track in the data area can be calculated, so that the optical pickup can be performed at the same time as the spaced distance calculated from the current position. It is a very useful invention that enables high speed track movement by jumping to a target track.

Claims (4)

A track access method of a recordable optical disc, comprising: a first step of confirming that a moved current position is a lead-in area when moving to a target track of an optical pickup; A second step of calculating a separation distance from a current lead-in area position to the target track based on absolute time information at a lead-in area end position when the lead-in area is confirmed; And a third step in which the optical pickup moves the track according to the calculated separation distance. 2. The method of claim 1, wherein the second step comprises: a lower first step of calculating the number of tracks from a current position in the lead-in area to the end position of the lead-in area; A lower second step of calculating the number of tracks from the lead-in area determination position to a target track in the data area; And a lower third step of calculating the separation distance by adding the calculated number of tracks. The track approach method according to claim 2, wherein the end position of the lead-in area is detected and stored from a reproduction control information area at the time of initial drive of the optical disc. 2. The track approach of the lead-in area according to claim 1, wherein the second step calculates a separation distance at which the time detected from the sub-queue information of the target track is equal to the absolute time information. Way.