KR19990011994A - Playback Method of DVD Disc with Multi-Layer Structure - Google Patents

Abstract

The present invention relates to a method for reproducing a DVD disc in which a data area in which a program is stored has a multilayer structure of a first layer and a second layer, wherein the screen is temporarily disconnected during the data disconnection period between the first layer and the second layer. A first step of storing last screen information of a program recorded at an end point of the first layer when the end point of the first layer data area is reached while reproducing the program of the first layer, in order to prevent a phenomenon from occurring; A second step of searching for a starting point of the data area of the second layer after the reproduction of data recorded in the data area of the first layer, and displaying the screen stored in the first step during the search time; In the second step, when the starting point of the data area of the second layer has been searched, the third step of performing normal playback is provided. The effect is to improve the performance of the DVD system by providing continuous video without interruption.

Description

Playback Method of DVD Disc with Multi-Layer Structure

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of playing a disc for a DVD (Digital Video Disc), and more particularly, to a DVD disc having a multi-layer structure in which a screen can be smoothly connected between layers when the DVD disc has a multi-layer structure. It relates to a regeneration method.

In general, a DVD disc is a storage medium capable of storing data equivalent to seven times the size of a CD, having the same size as a compact disc (CD) having a diameter of 12 cm and a thickness of 1.2 mm. For reference, a CD can hold 74 minutes of data, which translates into 688MB, whereas a DVD disc has the same amount of CD as the CD, depending on whether the playback side is single-sided, double-sided, single-layered or multi-layered. You can store up to 17GB in GB.

As DVD discs have such a large capacity, CDs use the MPEC-2 compression method which focuses on the image quality rather than the MPEC-1 compression method which takes the loss of image quality and concentrates on the maximum compression. It can provide a superior level of image compared to.

In addition, by allocating extra space for information including audio, subtitles, and various menus, the user can select the interactive progress function to advance the contents, multi-language subtitle processing for up to 32 languages, and Multi-language voice processing with 8-language sound tracks, digital surround provided via six speakers including front left and right, rear left and right, center and bass speakers, and multiple presets for movies. Multi-Story feature that allows users to select the story to their liking, Multi-Angle feature that allows viewers to select and view the desired angle by providing scenes shot from various angles, and rating for each scene It can be set to provide a parental control function and the like to limit the viewing.

As described above, due to various advantages, the disc for DVD is spotlighted as the next generation media, the development progress is accelerated, and is currently commercialized.

As such, the large capacity of DVD discs that can provide excellent video and sound quality and various functions is that the CD discs are 12Cm in diameter and 1.2mm thick aluminum discs. This is possible with a multi-layered structure in which two 0.6 mm aluminum discs are stacked.

Meanwhile, as shown in FIG. 1, each section of the DVD disk having a multilayer structure has a separate read-in area, data area, and read-out area for each layer. ), Or two layers covering the lead-in area, the data area, the middle area, and the lead-out area. A plurality of program data is stored in the data area, and the lead-in area is stored in the data area. The location information of the programs is written and recorded in TOC (Table Of Contents), and the middle area is a section for notifying that the end of a layer in a disk having a multi-layered structure. It is included.

A conventional method of reading data from a DVD disc configured as described above first reads TOC information contained in the lead-in area, recognizes the positional information of each program recorded in the data area of the disc, and then the data area of the first layer. Read the program listed in.

When the middle area is reached during playback of the program recorded in the data area of the first layer (when the current read position of the DVD player is M), the DVD player stops playing and the optical pickup unit reads the data recorded on the DVD. After moving (not shown) to the M 'position, the program recorded in the data area of the second layer is played in the direction of the lead-out area.

As described above, in the DVD disc having a two-layer structure, the start point of the second layer data area is searched to finish playing all the programs recorded in the data area of the first layer and to reproduce the programs contained in the data area of the second layer. There was a problem that the screen breaks up.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to temporarily store the last screen of a program stored at the end point of the data area of the first layer, so that the optical pickup unit is used in the first layer. The present invention provides a method for playing a DVD disc having a multilayer structure that can steer the last screen during the moment of moving to the second layer.

In order to achieve the above object, in the present invention, in the DVD playback method in which a data area in which a program is stored has a multi-layer structure of a first layer and a second layer, the first layer is reproduced while the program of the first layer is reproduced. A first step of storing last screen information of a program recorded at an end point of the first layer when the end point of the first layer data area is reached; A second step of searching for a starting point of the data area of the second layer after the reproduction of data recorded in the data area of the first layer, and displaying the screen stored in the first step during the search time; In the second step, the present invention provides a reproduction method for a DVD disc having a multi-layer structure, comprising: a third step of performing normal playback when the starting point of the data area of the second layer is completed.

1 is a diagram showing a playback method of a DVD disc having a multilayer structure according to the prior art;

2 is a system configuration diagram of a general DVD player for implementing a method of playing a DVD disc having a multilayer structure according to the present invention;

Fig. 3 is a detailed flowchart showing a method of playing a DVD disc having a multilayer structure according to the present invention.

* Explanation of symbols for main parts of the drawings

110: optical pickup unit 120: RF signal amplification unit

130: digital signal processing unit 140: storage unit

150: MPEG decoder 160: video signal processing unit

170: monitor 180: pickup transfer unit

190: servo unit 200: system control unit

210: audio signal processing unit 220: speaker

230: key input portion D: disc for DVD

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

2 is a system configuration diagram of a general DVD player for implementing a DVD disc playback method having a multilayer structure according to the present invention. The optical pickup unit 110, the RF (Radio Frequency) signal amplification unit 120, the digital Signal processor 130, storage 140, MPEG decoder 150, video signal processor 160, monitor 170, pickup transfer mechanism 180, servo 190, system controller 200, audio It is configured to include a signal processor 210, a speaker 220, a key input unit 230.

The optical pickup unit 110 irradiates a predetermined laser beam to the signal surface of the disk by servo control of the servo unit 190, reads out data stored in the disk as an RF signal, and provides the RF signal amplification unit 120. In addition, the amount of light reflected from the signal surface of the disk is detected to provide the servo unit 190 with a focusing error signal, a tracking error signal, and the like corresponding to the detected light amount.

The RF signal amplification unit 120 amplifies the RF signal provided from the optical pickup unit 110 and provides it to the digital signal processing unit 130, and the digital signal processing unit 130 is the RF amplified by the RF signal amplification unit 120. The signal is digitally signal-processed, subjected to error detection and error correction, and then output to the MPEG decoder 150.

The storage unit 140 stores the image data of the last screen among the data recorded at the end point M of the first layer data area.

The MPEG decoder 150 decodes an error corrected digital video signal and a digital audio signal provided from the digital signal processor 130 based on the MPEG compression format and outputs the decoded video signal to the video signal processor 160 and the audio signal processor 210. do.

The video signal processor 160 processes the decoded video signal provided from the MPEG decoder 150 and outputs the same to the monitor 170, and thus is displayed as an image on the monitor 170.

The pickup transfer unit 180 drives the optical pickup unit 110 based on the control signals of the servo unit 190 and the system controller 200.

The servo unit 190 generates a servo control signal corresponding to the focusing error signal and the tracking error signal provided by the optical pickup unit 110, and provides the generated servo control signal to the pickup transfer unit 180, thereby providing focusing servo and tracking. Let the servo be done.

The system control unit 200 controls the overall operation of the DVD player by applying signals generated from the key input unit 230 and the respective constituent members of the optical disc player.

The audio signal processor 210 processes the decoded audio signal provided from the MPEG decoder 150 and outputs the audio signal to the speaker 220. Accordingly, the speaker 220 transmits voice.

The key input unit 230 includes a plurality of keys including a play key and generates a key signal according to a user's key operation.

FIG. 3 is a detailed flowchart illustrating a reproduction method of a DVD disc having a multilayer structure according to the present invention, and the present invention implemented by the DVD system composed of the above-described structural members will be described in detail with reference to FIG.

First, when a disc is loaded in the DVD player (S 10), the system control unit 200 reads the pickup transfer unit 180 and the servo unit 190 to read the TOC information (Table Of Contents) assigned to the lead-in area of the loaded disc. ).

Under the control of the system controller 190, the pickup transfer unit 180 is driven to jump the optical pickup unit 110 to the lead-in area of the optical disc, and the servo unit 180 performs a focusing servo and a tracking servo. The optical pickup unit 110 may perform accurate TOC reading.

Thereafter, the TOC information read by the optical pickup unit 110 is provided to the system control unit 200 via the RF signal amplifying unit 120 and the digital signal processing unit 130, and the system control unit 200 provides the TOC information. The memory is stored in an internal memory (not shown) provided in the system controller 200 (S20). At this time, the TOC information includes the end point M of the first layer data area and the start point M 'of the second layer data area. It will contain location data for.

In operation S20, when a reproduction key signal is generated from the key input unit 230 by a user's key manipulation, the generated reproduction key signal is applied to the system controller 200, and thus, the system controller 200 is an optical pickup unit. The pickup transfer unit 180 and the servo unit 190 are controlled to perform the regeneration operation at 110.

Under the control of the system controller 200, the pickup transfer unit 180 transfers the optical pickup unit 110 to the data area of the DVD, and when the tracking servo and the focusing servo are performed in the servo unit 180, the optical pickup unit In operation 110, the data contained in the data area is read as an RF signal, and the read RF signal is provided to the RF signal amplifier 120.

The RF signal amplifier 120 amplifies the RF signal provided by the optical pickup unit 110 and provides the amplified RF signal to the digital signal processor 130.

Thereafter, the digital signal processor 130 performs digital signal processing on the RF signal amplified by the RF signal amplifier 120, performs an error and error correction, and then provides the digital video signal and the digital audio signal to the MPEG decoder 150. do.

The MPEG decoder 150 decodes an error corrected digital video signal provided from the digital signal processor 130 based on the MPEG compression format and provides the video signal processor 160 based on the MPEG compression format. The digital audio signal is based on the MPEG compression format. After decoding, the audio signal is output to the audio signal processor 210.

The video signal processor 160 and the audio signal processor 210 process the decoded video signals and the audio signals provided from the MPEG decoder 150 and output them to the monitor 170 and the speaker 220, and thus monitor 170. ), An image is displayed, and audio is output from the speaker 220.

While the disc is playing, the digital signal processor 130 provides time data, that is, Q data, indicating the current position of the disc currently being played to the system controller 200, and the system controller 200 supplies the digital signal processor 130. The current playback position is recognized with reference to the Q data provided in step S40.

In operation S40, the system controller 200 determines whether the current reproduction position corresponds to the end point M of the first layer data area by referring to the TOC information read and stored in operation S20. )

As a result of the determination in step S50, when the current playback position coincides with the end point of the first layer data area, the system control unit 200 performs an MPEG decoder (A) to continue the last screen of the image data recorded in the first layer end point M. 150).

The MPEG decoder 150 stores the data for the last decoded screen in the storage unit 140 under the control of the system controller 200 (S 60), and then stores the data for the decoded last screen. The extracted data is continuously provided to the video signal processor 160 for a predetermined time.

In this case, since the video signal processor 160 is provided with data about the same screen from the MPEG decoder 150, the monitor 170 will continue to display the image of the last screen of the program recorded in the data area of the first layer (S 70)

In steps S60 and S70, while the last screen is continued, the system controller 200 causes the optical pickup unit 110 to pick up the pickup transfer unit 180 and the servo to search for the start point M ′ of the second layer data area. The unit 190 is controlled.

Under the control of the system controller 200, the pickup transfer unit 180 moves the optical pickup unit 110 to the data start point of the second layer, and the servo unit 180 performs focusing servo and tracking servo to perform the second layer. The starting point M 'of the data area is searched (S80).

In operation S 80, when the search for the starting point M ′ of the second layer data area is completed (S 90), the system controller 200 stops the display of the last screen of the first layer. After controlling, the first half of the DVD system is controlled to be normally played back at the start point M 'of the second layer data area.

Under the control of the system control unit 200, the DVD system normally reproduces the program recorded in the data area of the second layer from the start point M 'of the second layer data area to the lead-out area.

In the above-described operation process, the time required for the step S60 to the S90, that is, the time required for searching for the starting point M 'of the second layer data area after the end of the program stored in the first layer data area is hundreds in advance. Since it is so short as msec, the user may feel a continuous screen even if the last screen of the first data area is continued during that time.

As described above, in the present invention, when the DVD having a multi-layer structure is played, the last screen of the first layer is stopped and held for the data disconnection period from the end point of the first layer data area to the start point of the second layer data area. Therefore, there is an effect that can provide a continuous image to the user without disconnection.

Claims (1)

In the DVD playback method, in which a data area in which a program is stored has a multilayer structure of a first layer and a second layer, A first step of storing last screen information of a program recorded at an end point of the first layer when the end point of the first layer data area is reached while playing the program of the first layer; A second step of searching for a starting point of the data area of the second layer after the reproduction of data recorded in the data area of the first layer, and displaying the screen stored in the first step during the search time; In the second step, the reproduction method of a DVD having a multi-layer structure, characterized in that the third step of performing a normal playback when the start point of the data area of the second layer is completed.