KR20030079567A - Method for reproducing a sub-picture data in optical disc device - Google Patents

Abstract

PURPOSE: A method for reproducing sub-picture data in an optical disk device is provided to easily search for and reproduce sub-picture data of wanted subtitle information without inputting keys several time. CONSTITUTION: A sub-picture unit is displayed on a screen. A start write position of the sub-picture unit is stored every point when the sub-picture is displayed on the screen. According to key input of a user, a microcomputer(22) reads the most recently recorded search information from a memory(23) and searches for the start write position of the sub-picture unit corresponding to the search information to reproduce the sub-picture data from the starting part of the sub-picture data unit.

Description

Method for reproducing a sub-picture data in optical disc device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of reproducing subpicture data and displaying a plurality of subtitles in an optical disc device, and more particularly, to searching sub-picture data recorded on a high density optical disc such as a digital versatile disc (DVD). And a sub picture data reproduction method for an optical disc device such as a DVD player for repeated reproduction, and a sub player for displaying and displaying sub picture data and caption data recorded on a high density optical disc simultaneously in a plurality of subtitles. And a plurality of subtitle display methods in an optical disk device.

In general, an optical disc device such as a DVD player or the like reads video and audio data recorded as a main title onto a DVD, which is a high-density optical disc, and processes a reproduction signal into a digital video and audio signal. A connection device such as a television outputs high quality video and high quality audio.

Meanwhile, subtitle information of various national languages may be additionally recorded as sub picture data in the DVD, and the sub picture data is reproduced and output in association with video and audio data corresponding to the main title. As a sub title, it may be randomly recorded and stored in some sections of the DVD.

Accordingly, the DVD player reads and reproduces the video and audio data recorded as the main title on the DVD, and also reads and reproduces the sub picture data recorded as the subtitle in a partial section of the DVD.

Therefore, the user having the DVD player can watch the video data of the main title read and reproduced from the DVD as a high-definition video through the main video screen of a general television, and of course, the sub picture data read and reproduced from the DVD. For example, subtitle information of various national languages can be viewed on a sub-picture screen of a general television, thereby improving the language ability of the user more efficiently.

However, if a user wants to search for and play a subtitle information previously read and reproduced or to play a predetermined section repeatedly while learning a language while watching subtitle information of various national languages read and reproduced from an optical disc such as a DVD, Since the recording position in which the subpicture data of the subtitle information is recorded must be directly searched through a plurality of key inputs, there is a problem that the user may feel inconvenience in use and deteriorate the efficiency of language learning.

Accordingly, in an optical disc device such as a DVD player or the like, whenever a preset user key, for example, a 'learning key' is input once, a jump playback is performed from a current playback position to a playback position before a predetermined time. Although a solution has been proposed, even in this case, there is a problem in that the user cannot search the desired recording position of the subpicture data accurately, and thus the efficiency of language learning cannot be increased.

On the other hand, when using an optical disc device such as a general DVD player for language learning, it is required to display and display subtitle information of a plurality of national languages recorded on an optical disc such as a DVD on one screen. Since only the subpicture data of any one national language designated by the user can be read out and reproduced among the subpicture data of the language, the caption information of a plurality of national languages cannot be reproduced and displayed simultaneously on the same single screen. There is a problem that does not increase the efficiency of language learning.

Therefore, the present invention was created to solve the above problems, and in an optical disc device such as a DVD player, a recording position for searching sub picture data such as subtitle information of various national languages displayed and reproduced during a normal playback operation is performed. In the optical disc apparatus for retrieving and storing the information or the reproduction time information as the search information of the sub picture data, and when the preset user key is input, the sub picture data previously displayed and reproduced can be searched and repeated more quickly and accurately. It is an object of the present invention to provide a subpicture data reproduction method.

Also, in an optical disc device such as a DVD player or the like, when a plurality of subtitles display is requested from a user during a normal playback operation, the caption image of the caption data and the subtitle image of the subpicture data are subtitle images of different national languages. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for displaying a plurality of subtitles in an optical disc device so that the respective screens can be separately displayed on the same screen.

1 illustrates a configuration of an optical disc apparatus to which a subpicture data reproduction method according to the present invention is applied.

2 shows a structure of a sub picture unit of a DVD to which the present invention is applied;

3 illustrates a correspondence relationship between a sub picture unit and a sub picture pack of a DVD to which the present invention is applied;

Fig. 4 is a diagram showing a sub picture unit playback display and playback stop state of a DVD to which the present invention is applied;

5 to 8 illustrate embodiments of sub picture data searched and repeatedly reproduced by the sub picture data reproduction method in the optical disc apparatus according to the present invention.

9 illustrates a configuration of an optical disk device to which the multi-caption display method according to the present invention is applied.

10 shows a recording format of caption data to which the present invention is applied;

11 illustrates a configuration of a caption frame to which the present invention is applied.

12 illustrates control code and text data of caption data to which the present invention is applied;

FIG. 13 is a flowchart illustrating an operation of displaying a multi-caption display in the optical disk device according to the present invention;

FIG. 14 illustrates a subpicture caption image and a caption caption image displayed on the screen by the method for displaying a plurality of subtitles in the optical disk device according to the present invention.

※ Explanation of code for main part of drawing

10,50 Optical disc 11,51 Optical pickup

12,52: RF signal processor 13,53: digital signal processor

14,54: Video decoder 15,55: Audio decoder

16,56: subpicture decoder 17,57: signal summing unit

18,58: spindle motor 19,59: sled motor

20,60: Servo unit 21,61: Motor drive unit

22,62: control unit 23,63: memory

64 Caption Decoder 65 Display Buffer

According to an aspect of the present invention, there is provided a method of reproducing sub picture data in an optical disk device, the method including: displaying a sub picture unit on a screen; Storing the start recording position of the sub picture unit at each time point when the sub picture unit is displayed on the screen; And searching and reproducing the start recording position of the sub-picture unit corresponding to the search information according to the set user's key input.

In addition, the method for displaying a plurality of subtitles in an optical disc apparatus according to the present invention includes: demodulating sub-picture data and caption data read out from the optical disc, and processing a reproduction signal into respective subtitle images corresponding thereto; And two steps of simultaneously displaying the caption images of the subpicture data and the caption data of the subpicture data processed by the reproduction signals on the same screen at the same time.

Hereinafter, exemplary embodiments of a method of reproducing subpicture data and displaying a plurality of subtitles in an optical disc apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

First, the subpicture data reproduction method according to the present invention can be applied to an optical disc apparatus such as a DVD player, for example, a video recorded on the optical disc 10, as shown in FIG. And an optical pickup 11, an RF signal processor 12, a digital signal processor 13, a video decoder 14, and an audio decoder 15 for reading out and reproducing audio data streams. Recording and storing sub-picture decoder 16 for processing a reproduction signal of sub-picture data such as subtitle information of various national languages, and recording position information or reproduction time information for searching and reproducing the sub-picture data. The memory 23 is configured to include.

In addition, the spindle motor 18 for rotating the optical disk, the sled motor 19 for moving the position of the optical pickup, the motor driver 21 and the servo unit for driving control of the spindle motor and the sled motor 20, a control unit 22 for controlling the operation of the respective configuration means is included.

Then, the control unit 22 compares the recording size of the current subpicture unit reproduced and displayed by the subpicture decoder 16 with the recording size of the subpicture unit reproduced immediately before the normal reproduction operation. If the recording sizes do not coincide with each other, it is determined that the new subpicture data is reproduced and displayed, and the recording size and start recording position information or reproduction time information of the current subpicture unit are used as search information. 23), the search information may be stored and managed in a form such as a book mark.

On the other hand, the structure of the sub-picture unit, as shown in Figure 2, the sub-picture unit header (SPUH: Sub-Picture Unit Header), pixel data (PXD: Pixel Data), and the sub-picture display control sequence table ( SP_DCSQT (Sub-Pic.Display Control Sequence Table), wherein the subpicture unit header (SPUH) includes two-byte size information (SPU_SZ) for indicating the recording size of the subpicture unit and the subpicture display. Two bytes of start address (SP_DCSQT_SA) information for indicating the start recording position at which the control sequence table is recorded are recorded.

In addition, the subpicture display control sequence table SP_DCSQT includes a plurality of subpicture display control sequences SP_DCSQ 0,1,2 .. The subpicture unit described above is illustrated in FIG. 3. As described above, the read-out picture is reproduced as a successive sub-picture stream into a plurality of sub-picture packs (SP_PCK i, i + 1, i + 2 ..) having a recording size of 2048 bytes.

In addition, as shown in FIG. 4, the subpicture decoder 16 performs decoding and reproduction signal processing operations on the subpicture units, and is designated by the subpicture display control sequence SP_DCSQ. According to a Display Control Command, the display of the sub picture data is turned on / off so that the sub picture data is reproduced and displayed only during a partial period of the valid period of the SPU of the sub picture unit. Or stop playback.

That is, the subpicture decoder 16 stores the display control command DSP_CMD_OFF that designates the display off while decoding and reproducing the corresponding subpicture unit, and stored in the internal buffer. The decoding and reproduction display operations of the sub picture data of the corresponding section are stopped.

On the other hand, in the control unit 22, the sub-picture stream includes the recording size (SPU_SZ) information of the current sub-picture unit reproduced and displayed by the sub-picture decoder 16 in a predetermined period, for example, a sub-picture stream. The picture unit header (SUPH) information is detected at predetermined intervals, and the recording size (SPU_SZ) information of the subpicture unit is read out, and then compared with the recording size information of the subpicture unit immediately displayed and reproduced. As a result of the comparison, when the recording sizes do not coincide with each other, it is determined that new subpicture data is reproduced and displayed.

The search for searching the subpicture unit for the reproduction time information (PTS of SPU) information of the subpicture unit or the start recording position (SPU_SA) information of the subpicture unit detected through the subpicture decoder 16 is performed. Information is recorded and stored in the memory 23. Through the above process, playback time information or start recording position information for each time point of the sub picture is turned on / off can be stored, The subpicture data reproducing method of searching for, reproducing, or repeating section reproduction of subpicture data such as subtitle information of various national languages desired by a user will be described in detail as follows.

5 to 8 illustrate various embodiments of the subpicture data searched and repeatedly reproduced by the subpicture data reproducing method of the optical disc apparatus according to the present invention. In the controller 22, a general reproducing operation is performed. In the meantime, the recording size (SPU_SZ # k) information of the current k-th sub-picture unit, which is decoded and reproduced and displayed by the sub-picture decoder 16, is searched and read out at a predetermined period, and then the k-1-th sub-displayed immediately before the display is read. This is compared with the recording size (SPU_SZ # k-1) of the picture unit (1).

If the recording size (SPU_SZ #k) of the k-th sub-picture unit and the recording size (SPU_SZ # k-1) of the k-th sub-picture unit do not coincide with each other, the current playback is displayed. Determine that the kth subpicture unit corresponds to new subpicture data that is different from the k-1th subpicture unit displayed and reproduced immediately before, and the recording size information and the reproduction time information (PTS of SPU #k) or start recording position information (SPU_SA #k) is recorded and stored in the memory 23 as search information (2).

Thereafter, as a first embodiment according to the present invention, when the user key, for example, the 'learning key', which is set in advance, is input (③), as shown in FIG. 5, 'learning' When the key 'is inputted, the latest recorded search information is searched and read in the memory 23, and then the starting recording position of the k-th sub-picture data corresponding to the search information is searched (4) for temporal continuity. Sub-picture unit, for example, "How are you?" A series of subpicture data search and playback operations are performed to reproduce and display the subpicture data from the beginning of the subpicture unit corresponding to the subtitle information of the complete sentence such as the like.

On the other hand, in the second embodiment according to the present invention, when the 'learning key' is input from the user (③), as shown in Figure 6, at the time when the 'learning key' is input In addition to temporarily storing the recording position of the current subpicture data being reproduced and displayed, the search information, which is recorded most recently at the time when the 'learning key' is input, is searched and read in the memory 23, and the search information is stored in the search information. The starting recording position of the corresponding k-th subpicture data is searched (4).

Then, the sub picture data is reproduced and displayed from the start recording position of the searched k-th sub picture data, and then the user can record the sub picture data to be read and reproduced until the portion of the sub picture data coincides with the temporarily stored recording position. According to the specified number of repetitive reproductions, a series of sub picture data interval repetitive reproducing operations for reproducing at least one or more times of the corresponding sections (4) to (3) are performed.

In addition, as a third embodiment according to the present invention, in the controller 22, when the 'learning key' is input from the user (③), as shown in Figure 7, at the time when the 'learning key' is input The most recently recorded search information is searched and read in the memory 23 to search (4) the start recording position of the kth subpicture data corresponding to the search information, and to start the searched kth subpicture data. Subpicture data is reproduced and displayed from the recording position.

Then, until a display control command (DSP_CMD_OFF) for designating the display-off of the subpicture data to be read out and reproduced (6) is detected (6), the corresponding sections (4) to (6) at least once in accordance with the number of repeated reproductions specified by the user. A series of sub picture data interval repetitive reproduction operations for abnormally reproducing are performed.

On the other hand, in the fourth embodiment according to the present invention, when the 'learning key' is input from the user (③), as shown in Fig. 8, when the 'learning key' is input as shown in FIG. The most recent recorded search information is searched and read in the memory 23, and the starting recording position of the kth subpicture data corresponding to the search information is searched (4), and the searched kth subpicture data is searched. When the 'learning key' is input once more, the reproduction time information or the start recording position information of the k-1th sub-picture data displayed and reproduced before is displayed. The memory 23 searches for and reads (6) a series of subpicture data for reproducing and displaying the subpicture data from the start recording position of the searched k-1th subpicture data. The production operation is carried out.

Therefore, the subpicture data previously displayed and reproduced can be searched and repeated more quickly and accurately, so that the user can easily search and reproduce the subpicture data of the desired subtitle information without inputting a plurality of keys.

On the other hand, the multi-subtitle display method according to the present invention can be applied to, for example, an optical disc device such as a DVD player, the video player recorded on the optical disc 50 and the DVD player, as shown in FIG. An optical pickup 51 for reading out and reproducing audio data streams, an RF signal processor 52, a digital signal processor 53, a video decoder 54, and an audio decoder 55 are also included. Subpicture decoder 56 for reproducing and processing subpicture data such as subtitle information of various national languages recorded on the subtitle; and a caption decoder 64 for reproducing and reproducing the caption data recorded in the video data stream. And a display buffer 65 for outputting and displaying the caption image of the caption data.

In addition, the spindle motor 58 for rotating the optical disk, the sled motor 59 for moving the position of the optical pickup, the motor driver 61 and the servo unit for controlling the drive of the spindle motor and the sled motor 60, a control unit 62 for controlling the operations of the respective constituent means, and a memory 63 for storing information necessary for the control operation.

When the user key, for example, a plurality of subtitle keys, is set in advance during the normal reproducing operation, the controller 62 controls the components to operate the optical disc 10 such as the DVD. For example, the caption image of the subpicture data and the caption data of the caption data are displayed in different languages, for example, the caption image of the subpicture data is set in a preset national language and the caption image of the caption data is a foreign language. The display is controlled so as to be displayed separately on the same screen of a general television.

On the other hand, before performing the multi-caption display operation as described above, the controller 62 displays an environment setting state set by a current user, that is, a display on / off state and state of subpicture data. Language information is stored (back-up) in the memory 63, which is to display the screen in a state set by the user again when the plural own display operation ends in the future.

As described above, the caption data is recorded and included in a video data stream recorded as a main title on an optical disc 50 such as a DVD. As shown in Fig. 10, a video header, which is a logical file after demodulating a video data stream, includes a sequence header, a sequence extension, extension data, and user data. (User Data) and the like, wherein the caption data is recorded and included as line 21_data in the user data.

In addition, caption data read as the 21st line of data in the user data as described above is accumulated in the display buffer 63 as a caption frame having four recording sizes, as shown in FIG. After storing, the data is temporarily output. For this, the display buffer 65 detects and confirms information indicating the start of caption data among demodulated outputs from the caption decoder 64 and then inputs the data. The caption data is accumulated and stored in units of frames. After that, the caption data is detected and checked to indicate the end of the caption data, and the caption data is temporarily displayed as a caption image having a predetermined size.

On the other hand, the caption data recorded as user data as described above is similar to the caption data transmitted and included in a normal analog video signal, as shown in FIG. 12, with a preamble control code. It may be configured to include Caption Text Up to 32 Character per Row, which is not directly related to the present invention, and thus will be omitted. Is input, the subtitle image of the caption data and the subtitle data of the subpicture data are selectively demodulated into subtitle images of different national languages, so as to be displayed separately on the same screen of a general television. Explain.

FIG. 13 is a flowchart illustrating a method for displaying a plurality of subtitles in the optical disk apparatus according to the present invention. In the controller 62, the respective operation means described above with reference to FIG. In step S10, a normal reproducing operation of reading and reproducing the video and audio data recorded in 50 is performed.

On the other hand, during the normal playback operation as described above, when a preset user key, for example, 'multiple caption key' is selected and input by the user, the caption image of the caption data and the subtitle image of the subpicture data are simultaneously displayed. It is determined that a plurality of subtitle display operations are requested (S11).

Accordingly, the controller 62 checks the data reproduction condition set by the user before the multi-subtitle key is input. For example, the display on / off state of the sub picture data and the user select The national language information of the subpicture data being reproduced is detected and stored in the memory 63 (S12).

Then, the subpicture decoder 56 and the caption decoder 64 are operated to control the subpicture data recorded on the optical disc 50 as a subtitle as described above with reference to FIGS. 2 to 4, and FIG. As described above with reference to Figs. 12 to 12, caption data recorded in the video data stream as a main title are read out (S13).

In this case, the control unit 62 displays a caption image of caption data that is demodulated and reproduced by the caption decoder 64 on the screen, and the sub-picture decoder 56 processes the demodulated and reproduced signal. The caption image of the picture data is displayed in a language character different from that of the caption data, that is, a native language. The native language is a language registered or registered by a user at the time of shipment of an optical disc device.

That is, if the subtitle image of the sub-picture data that the user has selected and viewed corresponds to 'French' before the 'multi-subtitle key' is input, when the multi-subtitle operation is requested, information for identifying the language type may be provided. In addition to being stored in the memory 63, 'Korea' which is preset country code information in the device is detected and read, and the subtitle data of the user's native language is outputted and displayed by reading and reproducing Korean sub-picture data.

At this time, the subtitle image of the sub-picture data of the native language and the subtitle image of the caption data of the foreign language are displayed together on the same screen of a general television as shown in FIG. For example, the caption image "How are you?" Of the caption data is displayed at the upper part of the screen, and the subtitle image "Hello?" Of the subpicture data is demodulated by the video decoder 54 so as to be displayed at the lower part of the screen. And superimposing timing with the main video signal reproduced and output (S14).

On the other hand, the controller 62, if the plurality of subtitles are requested to release during the simultaneous playback and display of a plurality of subtitle images through the above process (S15), the backup information stored in the memory 63, that is, Before the subtitle display operation, the display on / off state of the subpicture data, the national language information, and the like are detected and returned to the previous state (S16).

Accordingly, the user can watch and confirm the caption image of the native language and the caption image of the foreign language simultaneously with the high quality video on the screen of the general television, thereby greatly increasing the efficiency of language learning. Further, by using the caption data displaying the foreign language subtitles as character data, an electronic dictionary database can be provided inside the optical disk device, and functions such as word search can be used.

On the other hand, the caption data is generally recorded in English capital font (Font) data, in order to provide convenience to non-English speaking users who are not familiar with the uppercase font, as shown in Figure 14, shown in Figure 14 As described above, when mapping and storing the lowercase font data corresponding to the uppercase font data and the uppercase font data in the memory 63 and demodulating the caption data of the uppercase, The font conversion operation of converting and outputting a capital letter to a lowercase letter may be performed by reading font data.

As mentioned above, the above-described preferred embodiment of the present invention is disclosed for the purpose of illustration, and may be applied to another optical disc device other than a DVD player, and those skilled in the art will also appreciate the technical spirit of the present invention disclosed in the appended claims. And various other embodiments may be improved, changed, replaced or added to within the technical scope of the present invention.

The subpicture data reproduction and multi-subtitle display method in the optical disc apparatus according to the present invention as described above, subpicture data such as subtitle information of various national languages displayed and reproduced during the normal playback operation in an optical disc device such as a DVD player, etc. Search and store recording position information or reproduction time information for searching for the sub picture data as search information of the sub picture data, and when the user key is preset, using the search information, the sub picture data previously reproduced and displayed is more quickly and accurately. By searching and repeating playback, the user can easily search and play the subpicture data of the desired subtitle information without inputting several keys, so that the dialogue consisting of one sentence having a continuity in time can be reproduced without interruption. Also regular regeneration When the display of a plurality of subtitles is requested by the user during the execution, the subtitle image of the caption data and the subtitle data of the subpicture data are separately displayed on the same screen as subtitle images of different national languages, thereby allowing the user to display the general television. Through the screen of the subtitle image of the native language and the subtitle image of the foreign language, it is possible to view and check simultaneously with the high-definition video, it is a very useful invention that can greatly increase the efficiency of language learning.

Claims (10)

Displaying the sub picture unit on the screen; Storing the start recording position of the sub picture unit at each time point when the sub picture unit is displayed on the screen; And And searching for and reproducing the start recording position of the subpicture unit corresponding to the search information according to the set user's key input. The method of claim 1, The second step may include: a lower first step of storing a recording size and search information of the sub picture unit displayed on the screen; A lower two step of comparing a recording size of a successively input subpicture unit with a recording size of the stored subpicture data; And And determining the new data according to the comparison result. The method further comprises sub-stages of storing the recording size and the search information of the continuously input sub picture data. The method of claim 2, In the lower three steps, when the recording size of the current sub-picture unit and the recording size of the immediately preceding sub-picture unit do not coincide with each other, the display unit determines that the display of the new sub-picture data is displayed. Subpicture data reproduction method. The method of claim 2, In the sub-step 1, sub-picture data reproduction in the optical disc apparatus, wherein the sub-picture unit size (SPU_SZ) information is detected and confirmed by sampling the header information of the sub-picture unit at a predetermined period or less. Way. The method of claim 2, And the recording size of the subpicture unit is detected and confirmed by two-byte subpicture unit size (SPU_SZ) information recorded in the header of the subpicture unit. The method of claim 2, And the search information is the reproduction time information or the start recording position information of the sub picture unit. The method of claim 2, In the third sub-step, when a preset user key is input, the most recent recorded search information is read out at that point in time, and the first recording position of the corresponding sub-picture unit corresponding to the search information is searched and reproduced. A sub picture data reproduction method in an optical disk device. The method of claim 2, In the sub-step 3, the most recent recorded previous search information is sequentially read out according to a preset time point and the number of times of input of a user key, and the start recording position of the corresponding sub picture unit corresponding to the search information is determined. A method of reproducing subpicture data in an optical disc device, characterized by searching and reproducing. The method of claim 2, In the lower third step, when a preset user key is input, the recording position corresponding to the time point is temporarily stored, and then the latest recorded search information is read and the corresponding sub picture unit corresponding to the search information is read. And reproducing the section to the temporarily stored recording position at least once after searching for a starting recording position. The method of claim 2, In the third sub-step, when a preset user key is input, the most recent recorded search information is read out at that point in time, and searching and reproduction of the start recording position of the corresponding sub picture unit corresponding to the search information are performed. And reproducing at least one or more times a predetermined section until the picture unit is displayed off.