KR980011112A - Navigation Control Method in Optical Disc Player - Google Patents

Abstract

(A) determining whether a time search key signal and time information of a desired position are inputted or a track search key signal and a track number of a desired track are input, Wow; (B) Tracking gain and sled gain are set to be larger than predetermined values until a position N ahead of a desired search position according to time information or track number is reached. Executing; (C) when the current search position reaches a position N ahead of a desired search position by a predetermined time, performing a search by setting a tracking gain and a sled gain smaller than a predetermined value; (D) resetting the tracking gain and the slave gain to a predetermined value when the current search position reaches a desired search position.

Therefore, if the current search position is far from the desired search position, the search is performed at a faster speed than the predetermined speed, and when the current search position approaches the desired search position, the search is performed at a speed slower than the predetermined speed It is possible to search for a desired position more quickly and stably.

Description

Navigation Control Method in Optical Disc Player

1 is a schematic block diagram of an optical disc player for carrying out the present invention.

2 is a flowchart of a search control method in an optical disk player according to a preferred embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

10: pick-up and actuator unit 20: RF signal amplification and servo signal processing unit

30: motor drive unit 40: key input unit

50: Microcomputer 60: Digital signal processor

70: MPEG decoder 80: Audio signal processor

90: Video signal processing unit 100: Speaker

110: Screen

The present invention relates to a search method in an optical disk player, and more particularly, to searching for a desired position, a search is performed at a faster speed up to a predetermined position, and when a predetermined position is reached, And more particularly, to a search control method in an optical disk player for performing searching more quickly and accurately by performing searching.

With the development and development of audio and video media, an optical disk player has recently been developed for recording and reproducing audio and / or video data recorded on a 12 cm semi-permanent optical disk.

Such optical disc players include compact disc players (CDPs), laser disc players (LPPs) and compact disc graphic players (CDGPs), video compact disc players (VCDPs) disk player, etc. In general, a compact disc player is a device capable of reproducing only audio, and a laser disc player, a compact disc graphics player and a video compact disc player are devices capable of simultaneously reproducing video and audio.

In recent years, a digital video disk (DVD) using MPEG-2 moving picture compression technology has been developed. This is because a giga byte (GB) including a moving picture is recorded in a 12- Capacity data can be recorded and reproduced. In addition, there is a trend to continue to improve the performance.

Also, these optical disk players reproduce video and / or audio recorded on an optical disk and output it through a screen and / or a speaker, and have higher signal-to-noise ratios than conventional video and / And it can reproduce a signal with a high quality and / or sound quality, does not generate irregular reproduction and modulation noises, has very few distortion, has no ghost, and has random accessibility. And it is in a trend of spreading widely.

On the other hand, such an optical disc player has a search / playback function for allowing a user to input data for a desired desired position, to search for a desired position according to the data, and to perform playback from that position.

Such search playback includes a time search function for searching for and searching for the position by inputting time information data for a desired position, and a track search function for searching and reproducing the track by inputting a track number for a desired track. Search playbacks can be performed by searching for a desired position with reference to TOC (table of contents) information including time information for each track recorded in a lead-in area of the optical disc.

That is, even in the track search, the time data corresponding to the number of the input track is read from the TOC information, and the desired track can be searched according to the time data.

Conventionally, in performing this search function, since the driving of the pickup is controlled according to predetermined tracking gain and sled gain, it is possible to perform search at a constant speed at all times, There is a problem that a desired search point may not be found and a malfunction may occur when a scarch or an external shock of the disk occurs during the search.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide an optical disc player capable of finding a desired position more quickly and stably, And to provide a search control method of the mobile terminal.

According to a preferred embodiment of the present invention, there is provided a search control method for an optical disk player, comprising: (a) determining whether a time search key signal and a track number of a desired track are input; If the time search key signal and the time information are input in the step (a), or when the track search key signal and the track number are input, referring to the table of contents (TOC) information, Performing a search by setting a tracking gain and a sled gain to be larger than a predetermined value until reaching a position ahead of a predetermined time; and (c) Performing a search by setting the tracking gain and the saddle gain to be smaller than predetermined values when reaching a position ahead of a predetermined time; When a group search positions reach the desired search position includes the step of re-setting the tracking gain and the slag de gain to the predetermined value.

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

1 is a schematic block diagram of a conventional optical disc player for carrying out the present invention.

1, a typical optical disc player for carrying out the present invention includes a pickup and actuator unit 10, a radio frequency (RF) signal amplification and servo signal processing unit 20, a motor driving unit 30, The input unit 40 includes a microcomputer 50, a digital signal processing unit 60, an MPEG decoder 70, an audio signal processing unit 80, a video signal processing unit 90, a speaker 100 and a screen 110.

The pickup and actuator unit 10 executes an optical pickup from a disk loaded in a disk tray (not shown) and outputs an RF signal read out therefrom.

The motor driving unit 30 drives a spindle motor (not shown) to rotate the disc and actuate the actuator unit 10 so that the pickup unit 10 executes the optical pickup to read the data recorded on the disc, And output it as a signal.

The RF signal amplification and servo signal processing section 20 amplifies the RF signal provided from the pickup and actuator section 10 and also provides a servo control signal according to the signal to the motor driving section so as to perform focus servo and tracking servo.

The digital signal processing unit 60 processes the RF signal amplified and amplified RF signal provided from the servo signal processing unit 20, performs digital signal processing, performs error detection and error correction, and outputs the error signal to the MPEG decoder 70. The MPEG decoder 70 decodes the error corrected digital video signal and the audio signal provided from the digital signal processing unit 60 based on the MPEG compression format and outputs the decoded digital video signal and audio signal to the video signal processing unit 90 and the audio signal processing unit 80 . The audio signal processing unit 80 and the video signal processing unit 90 process the decoded audio and video signals provided from the MPEG decoder 70 and output them to the speaker 100 and the screen 110 respectively, And the screen 110 are respectively outputted as a voice and displayed as an image.

On the other hand, when a search key signal for search reproduction, for example, time search or track search key signal, time information of a desired position, or a desired track number is input from the key input unit 40, the microcomputer 40 refers to the TOC information And sets the driving gain, that is, the tracking gain and the saddle gain, to a predetermined value larger than a predetermined value, and provides the control signal to the motor driving unit 30, Accordingly, the motor driving section 30 is driven to perform the search faster than the predetermined search speed.

During this process, the microcomputer 50 compares the Q data provided from the digital signal processor 60 with the time information at a desired position and determines whether the current search position is a position N ahead of the desired search position by a predetermined time, The microcomputer 50 sets the tracking gain and the sled gain to a value smaller than a predetermined value, and when the position N reaches the position N ahead of the desired search position by a predetermined time, So that a desired search position can be found more accurately.

In addition, the microcomputer 50 continuously compares the time information at the current search position with the time information at the desired position and generates a control signal to the motor driver 30 to stop the search if they coincide with each other, The gain is reset to a preset value so that playback can be performed normally.

2 is a flowchart of a search control method in an optical disk player according to a preferred embodiment of the present invention.

In step S10, it is determined whether a time search key signal is input. If the time search key signal is input in step S10, the process proceeds to step S30 to read the input target time, that is, the time information about the desired position. If the time search key is not input in step S10, S20), it is determined whether a track search key signal is input. Then, the process proceeds to step S40 where the target track, i.e., the desired track number to be input is compared with the TOC information to read the time information about the desired track position When the step S30 and the step S40 are completed, the step S50 is performed.

In step S50, the tracking gain and the saddle gain are set to be larger than predetermined values by a predetermined amount, and in step S60, the search for the desired position input in step S30 or step S40 is started.

In step S70, it is determined whether the current search position reaches a position N ahead of the desired search position by a predetermined time. When the current search position reaches the position N ahead of the desired search position by a predetermined time in step S70, the process proceeds to step S80 where the tracking gain and the slave gain are set to be smaller than a predetermined value in step S80 And then continue the search.

Thereafter, in step S90, it is determined whether or not the current search position reaches the target position, that is, the desired search position. If the current search position reaches the desired search position in step S90, ), The tracking gain and the saddle gain are reset to predetermined values so that the reproduction is normally performed, and then the flow is returned.

Therefore, according to the present invention, when the search function is performed, the search is performed at the beginning of the search, that is, when the current search position is far from the desired search position, the search speed is made faster than the predetermined speed. When the current search position is close to the desired search position It is possible to search for a desired position more quickly and stably by executing a search at a speed slower than a predetermined speed. While the present invention has been particularly shown and described with reference to certain preferred embodiments thereof, those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the invention as set forth in the following claims.

Claims (1)

(A) determining whether a time search key signal and time information of a desired position are input or a track search key signal and a track number of a desired track are input; ) If the time search key signal and the time information are input in the step (a), or when the track search key signal and the track number are input, referring to the table of contents (TOC) information, Performing a search by setting a tracking gain and a sled gain to be larger than a predetermined value until a position N ahead of a predetermined time is reached; (C) when the search position reaches a position N ahead of the desired search position by a predetermined time, performing the search with the tracking gain and the sled gain set smaller than a predetermined value; (D) resetting the tracking gain and the saddle gain to the predetermined value when the seek position reaches the desired seek position. ※ Note: It is disclosed by the contents of the first application.