KR19990026853A - How to Navigate a Track in an Optical Disc Player - Google Patents

Abstract

The present invention is to solve the problem that if the target position to be played back is defective when searching and playing the optical disc player, the playback cannot be repeated and only the search attempt for the target position is repeated. Attempting to search, and if the target location is not searched, repeatedly searching for the target location and counting the number of times the search is attempted; A second step of searching for the changed target position after changing the target position from the target position to a position spaced by a predetermined distance when the number of search attempts counted in the first step exceeds a preset maximum number of search attempts; When the changed target position is searched in the second step, the method changes the micro target position by approaching the initial target position by the subdivided interval from the found change target position, and then repeats the process of searching for the changed fine target position. Three steps; And a fourth step of starting playback from the minute change target position searched immediately before the minute change target to be searched if the minute change target position to be searched in the third step is not searched for a predetermined time. By providing the track search method of the optical disc player, the search and playback can be realized even if the target position is defective.

Description

How to Navigate a Track in an Optical Disc Player

The present invention relates to an optical disc player, and more particularly, when a defect that cannot be corrected at a target position of an optical disc to be played exists, the target position is automatically changed to play a program recorded on the optical disc. A track searching method of an optical disc player.

In general, optical disc players include compact disk players (CDPs), laser disk players (LDPs), compact disk graphic players (CDGPs), and video compact disk players (VCDPs). video compact disk player) has been developed and widely used. Also, recently, a digital video disk (DVD) using MPEG-2 moving picture compression technology and a digital video disk player for playing the same have been developed. It can record and play back gigabytes (GB) of data including moving images on a 12cm optical disc such as a CD, and it is also designed to be compatible to play current CDs and VCDs.

Such an optical disc player has been developed to record and reproduce image and audio data on a semi-permanent optical disc as audio and video media have developed.

Such an optical disc player reproduces an image and / or audio recorded on an optical disc and outputs it through a screen and / or a speaker, and has a higher signal-to-noise ratio than conventional image and / or audio reproducing apparatus, resulting in better image quality and / or Or it can reproduce signals with sound quality, generate no noise due to irregular playback and modulation, very low distortion, no ghost, random access, etc. There is a trend.

On the other hand, the predetermined optical disc reproduced by the above-described optical disc player contains a predetermined program in units of tracks, so that the program is reproduced from the initial position of the track in which the program is recorded or from a position arbitrarily selected by the user.

However, the scratch of the disc at the initial position of the track in which the program is stored or the target position arbitrarily set by the user. If there is a defect in which data cannot be corrected due to contamination of the disc, the optical disc player cannot search the target position, and thus, there is a problem that the program contained in the optical disc cannot be reproduced by repeatedly attempting to search the target position.

Accordingly, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a defect that cannot be corrected at a predetermined target position on an optical disc arbitrarily set by a user for playing a predetermined program recorded on the optical disc. The present invention provides a track search method of an optical disc player configured to search for and play a point closest to a target position when the optical disc player fails to search a target position for more than a number of times.

In order to achieve the above object, in the present invention, a playback method of an optical disc player capable of performing playback by selecting any point of a predetermined program recorded in track units on an optical disc is selected for playing the program. Attempting to search for a target position, and repeatedly searching for the target position if the target position is not searched, but counting the number of times the search is attempted; A second step of searching for the changed target position after changing the target position to a predetermined position on the optical disc adjacent to the target position when the number of search attempts counted in the first step exceeds a preset maximum number of search attempts; When the changed target position is searched in the second step, the method changes the micro target position by approaching the initial target position by the subdivided interval from the found change target position, and then repeats the process of searching for the changed fine target position. Three steps; And a fourth step of starting playback from the minute change target position searched immediately before the minute change target to be searched if the minute change target position to be searched in the third step is not searched for a predetermined time. A track search method of an optical disc player is provided.

1 is an exemplary diagram conceptually showing an optical disc containing a predetermined program in order to explain a track search method of an optical disc player according to the present invention;

2 is a block diagram of hardware for implementing a track searching method of an optical disc player according to the present invention;

3 is a detailed flowchart illustrating a track searching method of an optical disc player according to the present invention.

* Explanation of symbols for main parts of the drawings

100: key input unit 200: system control unit

300: optical disc player 400: counter

500: storage unit 600: OSD processing unit

The above and other objects and advantages of the present invention will become more apparent from the preferred embodiments described below with reference to the accompanying drawings.

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

2 is a block diagram of hardware for implementing a track search method of an optical disc player according to the present invention, and includes a key input unit 100, a system control unit 200, an optical disc player 300, a counter 400, and a storage unit ( 500), and the OSD processing unit 600, the function of each component is as follows.

First, the key input unit 100 includes a plurality of function keys including a playback key, a plurality of numeric keys, direction keys, and the like, and generates a key signal corresponding to a user's key operation and provides the system control unit 200. do.

The system controller 200 controls the overall operation of the optical disc player 300 in response to a key signal provided from the key input unit 100 and a signal provided by each component of the optical disc player 300, and in particular, the optical disc player In operation 300, the number of attempts Nc to search for the target position is compared with the number of search attempts Ns preset and stored in the storage 500, and the counted number of search attempts Nc is preset. If it is greater than the number of times Ns, the optical disc player 300 is controlled to search for a proximity target.

The optical disc player 300 performs a general operation of the optical disc player, such as playback, under the control of the system controller 200, and in particular, a target position or a target position close to the target position set for playing a predetermined program recorded on the optical disc. Search and perform playback at that searched position.

The counter 400 counts the number of times the optical disc player 300 searches for a predetermined target point for playing the predetermined program recorded on the optical disc under the control of the system controller 200, and the counted number of search attempts ( Information about Nc is provided to the system controller 200.

The storage unit 500 stores predetermined character information for outputting to an OSD screen so that a user can set a target position, and the optical disc player 300 searches for a target point set for playing a program recorded on the optical disc. The maximum number of search attempts that can be set is stored in advance, and the playback position on the optical disc set by the user, that is, when the target position is not searched, the separation distance for changing the target position, and the changed target position are searched. The granular reference unit for changing the target position to a new target position close to the initial target position is preset and stored. In this case, the subdivided reference unit is a unit obtained by dividing the predetermined separation distance into a predetermined number to change the target position. Such a separation distance and the subdivided reference unit may be set based on time.

The OSD processor 600 OSD-processes predetermined character information extracted from the storage 500 under the control of the system controller 200 and displays the text information on a monitor (not shown).

Hereinafter, a track search method of an optical disc player according to the present invention implemented in hardware including the above-described structural members will be described in detail with reference to FIG.

1 is an exemplary view conceptually illustrating an optical disc in order to explain a track search method of an optical disc player according to the present invention, and FIG. 3 is a detailed flowchart illustrating a track search method of an optical disc player according to the present invention.

First, when an optical disc loaded with a predetermined program is loaded into the optical disc player 300 (S 10), the optical disc player 300 includes a table of contents area allocated to a load-in section of the optical disc. The TOC information is read and provided to the system controller 200, and the system controller 200 stores the TOC information in an internal memory (not shown) or the storage 500 provided in the system controller 200. (S20) Similarly, the TOC information read out from the TOC area may include position information for each track of the optical disc.

Subsequently, when the search reproduction key signal is generated from the key input unit 100 by the user's key operation and applied to the system control unit 200 (S30), the system control unit 200 allows the user to set a target position. In order to display the OSD screen for the display, predetermined text information is extracted from the storage unit 500 and the OSD processing unit 600 controls to process the OSD.

Under the control of the system controller 200, the OSD processing unit 600 OSD-processes predetermined character information extracted from the storage unit 500 to allow a user to set a target position on a monitor (not shown). In this case, the text information retrieved from the storage unit 500 may include a message for allowing a user to set a target position and a position indication or number for each track section.

In step S50, when a user manipulates a predetermined key provided in the key input unit 100 to select a desired target position, the key input unit 100 receives a key signal corresponding to the key operated by the user. The key to set the target position will be composed of numeric keys or direction keys.

In operation S50, when a predetermined key signal for setting a target position is applied from the key input unit 100, the system controller 200 searches for a target position corresponding to the key signal provided from the key input unit 100. The optical disc player 300 is controlled.

The optical disc player 300 searches for the target position Tp by moving a distance between the current position Th on the optical disc and a predetermined target position Tp set by the user under the control of the system controller 200. Will try to (S 60)

The system controller 200 determines whether the target position is searched at step S 60 (S 70), and as a result of the determination, if the target position Tp is not searched, the optical disc player ( 300, and the counter 400 to count the number of repetitions.

The counter 400 counts the number of times the optical disc player 300 attempts to search the target position Tp under the control of the system controller 200, and obtains information on the counted number of search attempts Nc. Provided to the system control unit 200. (S 80)

On the other hand, as a result of the determination in step S70, when the search for the target position is completed in the optical disk player 300, the system control unit 200 to play the predetermined program recorded on the optical disk from the target position (Tp) ( 300, and the optical disc player 300 plays back a predetermined program recorded on the optical disc from the target position Tp under the control of the system controller 200. (S250)

In operation S80, when the optical disc player 300 does not search for the target position Tp, and the information about the number of search attempts Nc repeated from the counter 400 is provided, the system controller 200 provides The number of search attempts Nc provided from the counter 400 is compared with the maximum number of search attempts Ns preset and stored in the storage unit 500 (S90).

As a result of the comparison of step S 90, when the number of search attempts Nc is smaller than the maximum number of search attempts Ns, the system control unit 200 repeats the step S 90 in step S 60 and the optical disc player 300 and the counter 400. To control the entire optical disc player system, including

On the other hand, as a result of the comparison in step S 90, when the number of search attempts Nc is greater than the maximum number of search attempts Ns, the system controller 200 is preset in the storage unit 500 to change the target position and refers to the information. The target position Tp1 is spaced apart from the initial target position Tp by a predetermined interval (S100).

Subsequently, the system controller 200 controls the optical disc player 300 to search for the target position Tp1 changed in step S 100, and the optical disc player 300 is controlled by the system control unit 200 to be initialized on the optical disc. Attempts to search for the changed target position Tp1 by moving the distance between the target position Tp and the changed target position Tp1 in step S100.

Meanwhile, at the same time as step S 110, the system controller 200 controls the counter 400 to count the time for searching for the changed target position Tp1 in the optical disc player 300, and the counter 400 controls the system controller 200. In operation S 110, the optical disc player 300 counts a time for searching for the changed target position, and provides information about the counted time to the system controller 200.

While the steps S110 and S120 are in progress, the system controller 200 determines whether the optical disc player 300 has searched for the changed target position Tp1 (S130).

Hereinafter, in order to help the understanding of the present invention, when the changed target position is searched by the optical disc flare 300 as a result of the determination of step S 130, it will be described later. First, the changed target position is not searched by the optical disc player 300. The failure case is explained.

As a result of the determination in step S 130, if the optical disc player 300 does not search for the changed target position, the system controller 200 waits for a preset search for searching for the target position for which the time t counted by the counter 400 is changed. It is determined whether it is greater than time (S 140).

As a result of the determination of S 140, when the counted time t is smaller than the preset search waiting time, the system controller 200 controls the entire optical disc player system to repeat from step S 110.

On the other hand, if the counted time t is greater than the preset search waiting time as a result of the determination of S 140, the system controller 200 determines that the defect exists in the changed target position Tp1, and the target is stored in the storage 500. The changed target position Tp1 is changed to the changed target position Tp2 after being spaced a predetermined interval with reference to the preset information for changing the position (S 150).

Subsequently, the system controller 200 performs the operation from step S 110 to step S until the search for the changed target position TpN (N = 1, 2, 3,...) Is completed within a predetermined time at step S 130. Control the overall optical disc player system to repeat steps up to 150.

Therefore, the overall optical disc player system searches for the changed target position TpN by repeating steps S 110 to S 150 under the control of the system controller 200.

Thereafter, when the search for the changed target position TpN is completed, the system controller 200 determines whether the searched target position TpN is the initial target position Tp set by the user (S 160).

As a result of the determination in step S 160, when the searched target position TpN is the initial target position Tp, the system controller 200 controls the optical disk player 300 to play normally from the searched target position TpN, and the optical disk The player 300 will play back normally from the searched target position TpN under the control of the system controller 200 (S 250).

On the other hand, as a result of the determination in step S 160, if the searched target position TpN is not the initial target position Tp, the system controller 200 searches for a target position as close as possible to find the target position as close as possible to the initial target position Tp. The position TpN will be changed to the new target position TmN moved by a predetermined distance in the direction of the initial target position Tp. (S 170) At this time, the search is completed. The moving distance for changing the target position TpN to the new target position TmN will be preset in minute units and stored in the storage unit 500, and the fine change target position TmN is set by the user. It is set to be located between the initial target position Tp and the searched changed target position TpN.

Thereafter, the system controller 200 controls the optical disc player 300 to search for the fine change target TmN, and the optical disc player 300 searches for the fine change target position TmN under the control of the system controller 200. (S 180)

In addition, the system controller 200 controls the counter 400 to count the time for searching for the fine change target position TmN in the optical disc player 300 during the step S180, and the counter 400 controls the system controller. Under the control of the control unit 200, the time for which the optical disc player 300 searches for the fine change target position TmN is counted, and information about the counted time is provided to the system control unit 200. (S 190)

During step S 180 and step S 190, the system controller 200 determines whether the optical disc player 300 has completed the search for the fine change target position TmN.

As a result of the determination in step S 200, when the optical disc player 300 completes the search for the minute change target position TmN, the system controller 200 searches for a position closer to the initial target position Tp set by the user. For example, the searched fine change target position TmN is changed to the next target position Tm (N + 1) spaced apart by a predetermined distance in the direction of the initial target position Tp (S210).

Thereafter, the system controller 200 controls to repeat steps S 170 to S 210 described above, and steps S 170 to S 210 are repeated throughout the optical disc player system.

On the other hand, if the fine change target position (TmN) has not been found in the optical disc player 300 as a result of the determination in step S 200, the system controller 200 writes the time counted by the counter 400 and the storage unit 500. The set search waiting time is compared (S 220). At this time, since the distance moving to search for the fine change target position TmN is smaller than the distance moving to search for the change target position TpN, the fine change target position ( The search waiting time for TmN) may be set equal to or less than the search waiting time for the change target position TpN.

As a result of the comparison of S 220, if the time counted by the counter 400 is smaller than the search waiting time, the first half of the optical disc player system is controlled to repeat the step S180 or less, and the entire optical disc player is controlled by the system control unit 200. By doing so, the above-described step S 180 may be repeated.

On the other hand, if the time counted by the counter 400 is greater than the search waiting time as a result of the comparison of S 220, the system controller 200 determines that the current fine change target TmN is also defective, and thus the current fine change target The optical disc player 300 is controlled to explore the fine change target Tm (N-1) immediately before being changed to TmN, and the optical disc player 300 controls the fine change target (the control of the system controller 200). Tm (N-1)) (S 230).

When the previous fine change target Tm (N-1) is searched by the step S230 (S240), the system controller 200 reproduces the normal playback from the fine change target Tm (N-1) which has been searched. The optical disc player 300 is controlled so that the optical disc player 300 plays back normally from the searched fine change target Tm (N-1) under the control of the system control unit 200 (S250).

According to the present invention, if the target position to be played back is defective during the search playback of the optical disc player and the target position is not searched even when the target position is searched for a predetermined number or more times, the search for the target position is repeated indefinitely. Instead, by automatically searching for and playing the distance as close as possible to the target position, there is an effect of improving the usability and performance of the optical disc player.

Claims (4)

A playback method of an optical disc player capable of performing playback by selecting any point of a predetermined program recorded in track units on an optical disc, A first step of searching for a target position selected for playing the program, and repeatedly searching for the target position if the target position is not searched, but counting the number of times the search is attempted; A second step of searching for the changed target position after changing the target position from the target position to a position spaced by a predetermined distance when the number of search attempts counted in the first step exceeds a preset maximum number of search attempts; When the changed target position is searched in the second step, the method changes the fine target position by approaching the initial target position by the section divided by the found change target position, and then repeats the process of searching for the changed fine target position. Three steps; And if the minute change target position to be searched in the third step is not searched for a predetermined time, a fourth step of starting playback from the minute change target position searched immediately before the minute change target to be searched. A track search method for an optical disc player. The method of claim 1, wherein the subdivided section for changing the changed target position into the finely changed target position comprises dividing a distance separated between the initial target position and the changed target position into a plurality of predetermined numbers. A track search method for an optical disc player. The method of claim 1, wherein the fine target position exists between the target position of the first stage and the target position of the second stage. A track of an optical disc player according to any one of claims 1 to 3, wherein the spaced distance between the target position and the change target position and the distance set to change the fine change target position are in units of time. Navigation method.