KR19980058706A - Search method of optical disc player - Google Patents

Abstract

The user can quickly find a track in which the user's desired data is stored on the optical disc. When a search command is input, the difference value between the track where the current optical pickup unit is located and the track to be searched is determined. Search for a desired track while moving the optical pickup at a high speed when the difference value of the track is equal to or greater than a preset fast movement value, and search for a desired track while moving the optical pickup at a low speed when the track difference value is equal to or greater than the preset low speed movement value. When is completed, it is determined whether the optical pickup unit has reached the track to be searched, and when it has not reached, the optical pickup unit is moved at a predetermined interval of tracks and positioned on the desired track.

Description

Search method of optical disc player

The present invention relates to an optical disc reproducing apparatus for reproducing predetermined data recorded on various optical discs such as CD (Compact Disk), LD (Laser Disk), VD (Video Disk), and the like. The present invention relates to a search method of an optical disc player for quickly finding a track.

In general, optical discs such as CDs, LDs, and VDs are capable of recording and reproducing predetermined data, and are robust, and the recorded data is not easily damaged, and the recorded data can be reproduced without noise by using light. As an advantage, its use is gradually increasing.

The optical disc is capable of recording a large amount of data, and when the user finds predetermined data desired by the user, it is preferable to move the optical pickup unit at a high speed to the track where the data is recorded.

1 is a signal flow diagram showing a conventional search method for moving an optical pickup unit to a track in which predetermined data desired by a user is recorded.

As shown in the figure, when a search command is input in step S1, a difference value between a track on which the optical pickup unit is currently located and a track to move the optical pickup unit is detected in step S2, and in step S3, It is determined whether the difference value is equal to or greater than the value of the preset track.

For example, it is determined whether the difference value between the track where the optical pickup unit is currently located and the track to be searched is 3000 tracks or more.

When the difference value of the track determined in the step S3 is equal to or greater than the preset track value, the difference value of the track is converted into a value in the basic track unit in step S4 and stored as a variable N.

For example, by dividing the difference value of the track by 200 and discarding it to the decimal point, the value above the decimal point is stored in the variable N.

In the next step S5, the optical pickup section is jumped on the reference track, i.e. 200 tracks, the value of the variable N is subtracted in step S6, and the value of the variable N in step S7 is' Determine if 0 '.

If the value of the variable N is not '0' in the step S7, the optical pickup unit is jumped by the basic track by repeating the operation from the step S5, the value of the variable N is subtracted, and then the variable ( It is determined whether the value of N) is '0'.

When the value of the variable N becomes '0' in step S7, the position of the track to be searched is checked in the next step S9, and 10 tracks are jumped in step S9.

In the next step S10, it is checked whether the optical pickup has passed the position of the track searched.

When the optical pickup unit does not pass the position of the track searched in step S10, step S9 is repeated to jump 10 tracks.

In such a state, when the position of the track where the optical pickup unit searches in the step S10 passes, the optical pickup unit jumps five tracks in the opposite direction to the present state in the next step S11, and the optical pickup in the next step S12. Check that the track has passed by the position of the track to be searched.

In step S12, when the optical pickup unit does not pass the position of the track searched, step S11 is repeated to jump five tracks.

In the case of passing the position of the track where the optical pickup unit searches in the step S12, in the next step S13, the optical pickup unit is jumped by one track in the original direction, and in the next step S14 to the track where the optical pickup unit is searched. Determine if you have reached it.

If the optical pickup does not reach the track to be searched in step S14, repeating the step S13 to jump the track by one track, and the search operation is terminated when the optical pickup reaches the track to be searched. do.

When the difference value between the track where the optical pickup unit is currently located and the track to be searched in step S3 is not equal to or greater than a preset reference track, after checking the position of the track to be searched in step S8, step S9A14 is performed. To move the optical pickup to the desired track position while gradually decreasing the jump speed of the optical pickup.

In the conventional search method, when the optical pickup unit is moved at a high speed, it is not easy to process a signal that jumps a track, and thus the optical pickup unit is jumped by a predetermined reference track, and the optical pickup unit has reached an adjacent track of the track searched by the optical pickup unit. In this case, since the number of tracks to jump is gradually reduced to find the desired track, it takes a lot of time.

It is therefore an object of the present invention to provide a search method of an optical disc player which moves the optical pickup unit to a desired track position at a high speed.

The search method of the optical disc player according to the present invention for achieving the above object determines the difference value between the track on which the current optical pickup unit is located and the track to be searched when a search command is input.

When the difference value of the determined track is equal to or greater than the predetermined high speed movement value, the desired track is searched while moving the optical pickup unit at high speed, and when the difference value of the track is equal to or greater than the preset low speed movement value, the desired track is searched while the optical pickup unit is moved at low speed.

When the low-speed search is completed, it is determined whether the optical pickup unit has reached the track to be searched, and when the low-speed search has not been reached, the optical pickup unit is moved at a predetermined track interval and positioned on the desired track.

Therefore, according to the present invention, the optical pickup portion can be moved at a high speed at the position of the track to be searched.

1 is a signal flow diagram showing a conventional search method.

2 is a circuit diagram showing a configuration of an optical disk player to which the search method of the present invention is applied.

3 is a signal flow diagram showing a search method of the present invention.

Explanation of symbols on the main parts of the drawings

11: optical disc

12: microcomputer

13: operation command input unit

14 optical pickup unit

15: pickup control unit

16: signal processing unit

17: spindle motor

18: spindle motor drive unit

Hereinafter, a search method of an optical disk player according to the present invention will be described in detail with reference to the accompanying drawings of FIGS. 2 and 3.

2 is a circuit diagram showing the configuration of an optical disk reproducing apparatus to which the search method of the present invention is applied. As shown therein, the optical disc 11, the microcomputer 12 for controlling the search of the optical disc 11 and the reproduction of the recorded signal, and the microcomputer 12 for operating instructions according to the user's operation. An operation command input unit 13 for inputting into an optical disc; an optical pickup unit 14 for reproducing predetermined data stored in the optical disc 11; and the optical pickup unit 14 under the control of the microcomputer 12. ), A pickup control unit 15 for adjusting and moving the focal point, a signal processing unit 16 for processing a reproduction signal of the optical pickup unit 14, and a spindle motor 17 for rotating the optical disk 11; And a spindle motor driver 18 for controlling the rotation of the spindle motor 17 under the control of the microcomputer 12.

In the optical disc player having such a configuration, the operation command input unit 13 inputs the operation command according to the user's operation of the function key to the microcomputer 12.

Here, when the input operation command is a reproducing command, the microcomputer 12 controls the spindle motor drive unit 18 to drive the spindle motor 17 according to the input operation command, so that the optical disc 11 is rotated. do.

Then, the microcomputer 12 controls the optical pickup unit 14 through the pickup control unit 15 to adjust the focus, and moves to the inside and the outside of the optical disc 11 while being stored in the optical disc 11. Play back the data.

The signal reproduced by the optical pickup section 14 is processed by the signal processing section 16 and output.

When the input operation command is a search command, the microcomputer 12 determines a difference value between the track on which the optical pickup unit 14 is currently located and the track to be searched, and the pickup control unit 15 according to the determined difference value of the track. The optical pickup 14 is moved to the position of the desired track while moving.

3 is a signal flowchart showing a search method of the present invention. As shown in the figure, when a search command is input in step S21, a difference value between the track on which the optical pickup unit 14 is currently located and the track to be searched is calculated in step S22.

It is determined whether the calculated difference value of the track is equal to or greater than the fast moving value preset in step S23, for example, the difference value of the track is 1500 track or more.

When the difference value of the track in step S23 is equal to or greater than 1500 tracks, the optical pickup unit 14 moves at high speed in step S25 while checking the track to be searched in step S24. To perform a high-speed search.

In this state, when the high-speed search is completed or the difference value of the track in step S23 is not equal to or higher than the preset high speed shift value, the track difference value is greater than or equal to the low speed shift value in step S27. It is determined whether the difference is greater than or equal to 100 tracks.

When the difference value of the track in step S26 is equal to or higher than the low speed moving value, the optical pickup unit 14 moves at low speed in step S28 while checking the track to be searched in step S27. Move to perform low speed search.

In this state, when the low-speed search is completed or the difference value of the track in step S26 is not equal to or greater than the preset low-speed moving value, it is determined whether the optical pickup unit 14 has reached the search track in step S29. do.

When the search track is not reached in the step S29, the optical pickup 14 is jumped by 4 tracks in the next step S30, and the track searched by the optical pickup 14 is searched in the next step S31. Determine if it passed.

When the optical pickup unit 14 does not pass the track where the optical pickup unit 14 searches in step S31, the optical pickup unit 14 jumps by four tracks in step S30 to perform a search operation.

When the optical pickup unit 14 passes the track where the optical pickup unit 14 searches in step S31, the optical pickup unit 14 is jumped by two tracks in the opposite direction to the above step in step S32. The search operation is terminated when the optical pickup section 14 passes the track to be searched.

As described above, the present invention moves the optical pickup unit at high speed when the difference value between the track at which the optical pickup unit is currently located and the track to be searched is equal to or greater than the preset high speed movement value, and moves the optical pickup unit at low speed when it is equal to or more than the low speed movement value. The search operation can be performed at a high speed at the position of the track for searching the optical pickup unit.

Claims (3)

A first step of detecting a difference value between a track at which the current optical pickup unit is located and a track being searched when a search command is input; and an optical pickup unit when the difference value detected at the first step is equal to or higher than a predetermined fast moving value. A second step of performing a search operation while moving at a high speed; and moving the optical pickup unit at a low speed when the difference value detected in the first step is equal to or greater than a predetermined low speed moving value or when the high speed moving is completed in the second step. In the third step of performing the search operation, and when the difference value detected in the first step is not more than a predetermined low speed moving value or when the low speed moving is completed in the third step, the moving speed of the optical pickup unit is gradually reduced. A search method of an optical disc player according to claim 4, characterized in that it is controlled by a fourth process of placing it in a track to be searched. The search method according to claim 1, wherein the second process and the third process perform a search operation after confirming a position of a track to be searched. The method of claim 1, wherein the fourth process moves the optical pickup unit by 4 tracks, moves the optical pickup unit by 2 tracks in the opposite direction when the optical pickup unit passes the search track, and then ends the search operation when the optical pickup unit passes the search track. A search method for an optical disc player, characterized in that.