KR19990041942A - Seek playback method for optical discs and optical disc players - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc and an optical disc player, comprising: an absolute address for recognizing a position of each section of the optical disc, the optical disc capable of recording continuous image data in a group of pictures (GOP); A program area for recording data of the plurality of image groups; A predetermined target of an optical disc having position information on an optical disc comprising an position information area for storing position information of each of the plurality of image groups as the absolute address and an image group (GOP) consisting of an inter screen and an intra screen A search and reproducing method of an optical disc player for searching and reproducing a position, comprising: a first step of setting a target position in the optical disc to which search and reproduction is to be performed; referring to the position information of the video group, the target position is included. A second step of modifying a target position to an intra screen start point of an image group; A third step of searching for the target position modified in the second step; By providing a search method for an optical disc player comprising a fourth step of performing playback from the target position searched in step 3, there is an effect that the time required for searching and reproducing a predetermined target track can be shortened.

Description

Seek playback method for optical discs and optical disc players

The present invention relates to search playback of an optical disc player, and more particularly, to an optical disc capable of recording position information of a group of pictures (GOP; Gropu Of Pictures) located on a target track for search playback and an optical disc. The present invention provides a search and playback method for an optical disc player that performs search and playback by using location information of a recorded video group.

In general, an optical disc is composed of a plurality of tracks for recording information, and an advanced disc capable of recording, erasing, and reproducing data in units of gigabytes by using a light such as a laser beam. Mass storage media.

In addition, an optical disk player is a compact disk player (CDP; Compact Disk Player), a laser disk player (LDP; Laser Disk Player), a compact disk graphic player (CDGP; Compact Disk Graphic Player), a video compact disk player (VCDP: video). It refers to a device that can perform a function of irradiating a laser beam onto an optical disk containing a predetermined program, such as a compact disk player) and a DVDR (Digital Video Disc Recorder). At this time, the program consists of only audio signals or audio and video signals.

Such an optical disc disc player reproduces video 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 video 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.

In particular, the optical disc and the optical disc player are provided with a search and play function, which is difficult to perform in a voice and video apparatus using a conventional storage medium, and refers to a function for directly playing from a target position selected by a user.

Hereinafter, a search and reproduction method provided by an optical disc player using a conventional optical disc will be described with reference to FIGS. 1 and 2.

FIG. 1 is a block diagram illustrating an optical disc player system capable of performing a track search method of an optical disc player, and includes a key input unit 100, a system control unit 200, an optical disc player 300, and a storage unit 400. FIG. 2 is an exemplary diagram conceptually illustrating an optical disc in order to explain a track search method of an optical disc player according to the prior art. FIG. 2 is a table of contents area (TOC), a program area (20), and a GOP (30). ), An intra screen 32, and an inter screen 34.

First, when an optical disc is loaded into the optical disc player 300, the optical disc player 300 reads TOC information of the loaded optical disc under the control of the system controller 200, and reads the read TOC information into the system controller 200. To provide. In this case, the TOC information is stored in the TOC area 20 located in the read-in section of the optical disc, and stores position information about the start point and the end point of each track included in the optical disc.

The system controller 200 stores the TOC information provided from the optical disc player 300 in the storage 400 and waits for a key signal from the key input unit 100.

Subsequently, when the search reproduction key signal is applied from the key input unit 100, the system control unit 200 obtains predetermined character information for setting the target position P by an OSD (On Screen Display) screen (not shown). The user sets the desired target position P by manipulating the selection keys included in the key input unit 100 with reference to the displayed character information. In this case, the target position P may be any point of the program area 20 shown in FIG. 2.

When the setting for the target position P is finished, the optical disc player 300 searches for the target position P selected by the user under the control of the system controller 200. At this time, the program stored in the target position P is very likely to be an inter screen.

That is, in the general optical disc player 300, in order to store a large amount of data on an optical disc of limited storage capacity, a plurality of intra screens are combined and stored in a GOP unit on one intra screen 32 as a reference screen.

Referring to FIG. 1, which shows an example of a picture type arrangement in a general GOP, one GOP includes a B picture composed of information about one complete picture, and a B / P picture consisting of prediction pictures for the I picture. You can see it consists of 14 chapters.

Here, an I picture (Intra Picture) is an intra picture encoded with only one piece of picture information without using inter-frame prediction in order to secure independence of the GOP, and P picture (Predictive-Picture) and B picture (Bidirectionally Predictive). A picture) is an inter picture generated by performing prediction from an I picture that is an intra picture.

If the optical disc contains a program in the unit of GOP shown in FIG. 3, the probability that the program recorded in the target position P is an intra screen is 1/15, and the probability that the program is an inter screen is 14/15.

Therefore, almost all inter screens are stored in the target position P selected by the user.

However, as described above, since the inter screen is configured as a prediction screen for the intra screen which is a reference screen, the inter screen alone cannot constitute a predetermined image.

Therefore, even if the user sets the predetermined target position P provided in the optical disc, playback will be performed from the start position P 'of the intra screen included in the GOP included in the target position P in practice.

As described above, in the conventional search and playback, although the playback is actually performed from the start position P 'of the intra screen included in the GOP included in the target position P set by the user, the target position set by the user ( After searching P first and then playing back by searching the starting position P 'of the intra screen included in the GOP included in the target position P, there is a big problem in that the time required for searching play is performed. .

Accordingly, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide an optical disk having a location information area capable of recording location information of each of a plurality of GOPs recorded on the optical disk. Another object of the present invention is to provide a search and playback method of an optical disc player configured to perform search and playback using the location information of a GOP included in the location information area.

In order to achieve the above object, in an aspect of the present invention, in an optical disc capable of recording continuous image data in units of a group of pictures (GOP), recognizing the position of each section of the optical disc Absolute address for; A program area for recording data of the plurality of image groups; An optical disc including a location information area for storing location information of each of the plurality of image groups as the absolute address is provided.

In addition, in order to achieve the above object, in another aspect of the present invention, an optical disc player for searching and reproducing a predetermined target position of an optical disc having position information on a video group (GOP) consisting of an inter screen and an intra screen is searched. A playback method, comprising: setting a target position in the optical disc on which the search playback is to be performed; referring to the position information of the video group, selecting the target position as an intra screen start point of the video group including the target position; A second step of correcting; A third step of searching for the target position modified in the second step; There is provided a search method for an optical disc player comprising a fourth step of performing playback from a target position searched in step 3 above.

1 is a block diagram illustrating an optical disc player system capable of performing a track search method of an optical disc player;

2 is an exemplary view conceptually showing an optical disc to explain a track searching method of an optical disc player according to the prior art;

3 is an exemplary diagram illustrating an example of a screen type arrangement in a general GOP;

4 is a structural diagram conceptually showing the structure of an optical disc according to the present invention;

Fig. 5 is a detailed flowchart showing a track search method of the optical disc player according to the present invention.

<Description of Symbols for Main Parts of Drawings>

100: key input unit 200: system control unit

300: optical disk player 400: storage unit

10: TOC area 20: program area

30: GOP 32: Intra Screen

34: inter screen P: target position

The above and other objects and advantages of the present invention will be more clearly apparent from the following description taken in conjunction with the accompanying drawings.

Hereinafter, a method of searching and reproducing an optical disc and an optical disc player according to the present invention will be described in detail with reference to FIGS. 1 to 4 with reference to the accompanying FIG. 5, and has the same function as that shown in FIGS. 1 to 3. The same reference numerals will be used for structural members according to the present invention.

In addition, in order to help understanding according to the present invention, first, the optical disc according to the present invention will be described, and then the track search method of the optical disc player according to the present invention will be described.

First, FIG. 4 is a structural diagram showing the structure of an optical disc according to the present invention. According to the same figure, the optical disc according to the present invention includes an absolute address for each predetermined section, and includes a program area 20 and a location information area 40. It is divided to include. At this time, the absolute address is for indicating each position of the optical disk, and has the same absolute address for the same position regardless of the program stored in the optical disk.

The program area 20 is an area in which a program consisting of video and audio is divided into GOP units and occupies almost the entire optical disc.

In the meantime, the location information area 40 stores location information for each of a plurality of GOPs in which a predetermined program is stored and recorded in the program area 20, in particular, information about a start position of an intra screen included in the GOP. As the area, in the conventional optical disc, the TOC area is contrasted with the recording of TOC information including positional information about the start and end points of each track.

Hereinafter, the track search method of the optical disc player according to the present invention which performs search reproduction from a predetermined position of the optical disc having the structure according to the above-described process will be described. At this time, the program is stored in the program area 20 of the optical disc as a plurality of GOP, the position information for each of the GOP of the program recorded in the position information area 40 is recorded, the track of the optical disc player according to the present invention The searching method is performed by the general optical disc system shown in FIG.

First, when an optical disc is loaded in the optical disc player 300 (S 10), the system controller 200 reads the position information for each of the plurality of GOPs contained in the position information area 40 of the optical disc. ), And the optical disc player 300 reads the position information of each GOP included in the position information area 40 and provides it to the system controller 200 under the control of the system controller 200. In this case, the position information on the GOP is position information on the start point and the end point of the GOP area including the absolute address, and in particular, the position information on the start point of the intra screen must be included.

The system control unit 200 having received the position information of the plurality of GOPs from the optical disc player 300 stores the information provided from the optical disc player 300 in the storage unit 400, and then receives a key from the key input unit 100. Wait for the signal to be applied (S 20).

Subsequently, when the user operates the search play key among the plurality of function keys provided in the key input unit 100, the key input unit 100 generates a predetermined key signal corresponding to the search play key, that is, the search play key signal. Provided to the system control unit 200. (S 30)

The system control unit 200 receiving the search reproduction key signal from the key input unit 100 is provided in the optical disc player 300 to display predetermined character or image information for setting a target position P to be searched by the user. The OSD processing unit (not shown) and the like are controlled, and the OSD processing unit (not shown) and the associated components provided in the optical disc player 300 display predetermined text or image information under the control of the system control unit 200. .

Thereafter, the viewer desires to search and reproduce by operating a selection key among a plurality of function keys included in the key input unit 100 while viewing predetermined text or image information displayed through a display unit (not shown) such as a monitor. A predetermined target position P is set. (S40)

When the target position P is set by the user, the system controller 200 refers to the GOP position information stored in the storage 400 in step S 20, and the data contained in the target position P is displayed on the intra screen 32. In step S50, it is determined whether the inter screen 34 is present.

As a result of the determination in step S50, if the target position P is an intra screen, the system controller 200 controls the optical disc player 300 to search for the target position P. FIG.

The optical disc player 300 searches for the target position P set by the user in step S40 under the control of the system controller 200 (S80).

On the other hand, if it is determined in step S50 that the program stored in the target position P is the inter screen, the system controller 200 refers to the GOP screen information stored in the storage unit 400 in step S20, The intra screen start position P 'in the GOP including the inter screen stored in the position P is searched (S60).

When the intra screen start position P ′ is found in step S 60, the system controller 200 searches for the target position P set by the user in step S 40, in step S 60. The optical disc player 300 is controlled to search for the modified target position P '.

The optical disc player 300 searches for the corrected target position P 'under the control of the system controller 200 (S80).

Thereafter, the system controller 200 determines whether the optical disc player 300 has completed searching for the target position P / P '(S90), and as a result of the determination, the target position P / P in the optical disc player 300 is determined. When the search at ') is completed, the optical disc player 300 is controlled to start playback from the target position P / P'.

The optical disc player 300 reproduces the program recorded at the target position P / P 'searched at step S80 under the control of the system controller 200. (S100)

According to the present invention described above, the playback is performed by searching the starting point of the intra screen of the GOP stored in the target position, thereby reducing the time required for searching and reproducing.

Claims (2)

In an optical disc capable of recording continuous image data in units of a group of pictures (GOP), An absolute address for recognizing a position for each section of the optical disc; A program area for recording data of the plurality of image groups; And a location information area for storing location information of each of the plurality of image groups as the absolute address. A search and reproducing method of an optical disc player for searching and reproducing a predetermined target position of an optical disc having position information on a video group (GOP) consisting of an inter screen and an intra screen, A first step of setting a target position in the optical disc on which seek reproduction is to be performed; A second step of modifying a target position to an intra screen start point of the image group including the target position by referring to the position information on the image group; A third step of searching for the target position modified in the second step; And a fourth step of performing playback from the target position searched in step 3 above.