KR19980017221A - How to Change Subtitle Position in Digital Video Disc Players - Google Patents

Abstract

The present invention relates to a method for changing a subtitle position in a digital video disc player, comprising: (a) determining whether a subtitle position change key signal and subtitle position change data are inputted when a reproduction key signal is input and playback is performed; B) If the subtitle position change key signal and the subtitle position change data are input in step (a), the original subtitle position data recorded at the time of disc production is replaced with the changed data and the subtitle position data is changed according to the subtitle position data changed from the next subpicture. Changing the position of the caption, and (c) determining whether the caption home position key signal for returning to the caption position is input, and (d) the caption home position key signal in step (d). If input, displaying the subtitle according to the original subtitle position data.

Therefore, the present invention has the advantage that the position of the subtitles can be changed to the desired position and can be changed to the original position when playing the disc having the subtitle data in the digital video disc player.

Description

How to Change Subtitle Position in Digital Video Disc Players

1 is a diagram showing the format of data recorded on a digital video disc;

2 shows subtitle position data for determining a position where a subtitle is displayed;

3 is a schematic block diagram of a general digital video disc player for practicing the present invention.

4 is a flowchart of a subtitle position changing method in a digital video disc player according to a preferred embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

5: key input unit 10: control unit

15: optical pickup

20: RF amplifier and focus / tracking error detector

25: servo signal processing unit 30: motor and motor driving unit

35: digital signal processor 40: MPEG-2 video decoder

45: video signal processor 50: AC-3 decoder

55: audio signal processor 60: screen

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video disc player, and more particularly, to changing the position of a subtitle in a digital video disc player that can change the position of a subtitle to a desired position when playing a disc in which subtitle data is recorded in addition to a video signal in a digital video player. It is about a method.

With the development of audio and video media, optical disc players for recording and reproducing video and audio data on semi-permanent optical discs have been 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.

In addition, such an optical disk player includes a compact disk player (CDP), a laser disk player (LDP), a compact disk graphic player (CDGP), and a video compact disk player (VCDP: video compact disk player) has been developed and used.

Recently, a digital video disk (DVD) using MPEG-2 moving picture compression technology and a digital video disk player for reproducing the same have been developed, which can include a moving picture in a 12 cm optical disc such as a current CD. Giga byte (GB) capacity of data can be recorded and played back, and the current CD and VCD can be played back to be compatible.

On the other hand, since DVD can record program data for a long time, movie or language use is mainstream in recent commercially available DVDs. Subtitle data is video when foreign currency is recorded on such a DVD, and in case of language DVD. It is included with the data.

Fig. 1 shows the format of data to be recorded on a DVD. Subtitle data is recorded in a sub-picture area of the video data area of File 1 of the DVD recording area shown in Fig. 1.

Also, a display control command (SPDCCMD) region, which is a partial region of the DCSQ 0 region constituting the display control sequence table (DCSQT) region of the sub-picture region, is a region in which data for controlling display of pixel data is recorded. It has display information, including 6-byte subtitle data display area information data, that is, subtitle position data.

2 shows the above-mentioned 6-byte subtitle position display information.

In general, subtitle data display information for video data recorded in the NTSC system is represented by X-axis coordinates of 0 to 719 and Y-axis coordinates of 0 to 479. Further, immediately before the caption position data display information shown in Fig. 2, data 05h for recognizing that the next information is the caption position data display information is preceded.

As a result, the position of the subtitle displayed when playing the DVD in the DVD player can be varied by changing the 6-byte subtitle position data as described above.

Accordingly, the present invention has been conceived in view of the foregoing, and an object of the present invention is to enable a digital video disc player to change the position of a subtitle displayed together with a video image to a desired position when performing playback in a digital video disc player. To provide a method for changing the subtitle position in.

According to a preferred embodiment of the present invention for achieving this object, in a digital video disc player, a method for changing the position of a subtitle displayed when playing a disc having subtitle data recorded with video data to a desired position, A) determining whether the subtitle position change key signal and the subtitle position change data are inputted when the reproduction key signal is input and reproduction is executed; (B) If the subtitle position change key signal and the subtitle position change data are input in step (a), the original subtitle position data recorded at the time of disc production is replaced with the changed data, and the subtitle position data changed from the next subpicture is added. Changing the position of the subtitle according to the display; (C) determining whether a subtitle home position key signal for repositioning the subtitle is input; (D) if the subtitle home position key signal is input in the step (c), displaying the subtitle according to the original subtitle position data.

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

3 is a schematic block diagram of a conventional DVD player for practicing the present invention.

As shown in FIG. 3, a typical DVD player for implementing the present invention includes a key input unit 5, a control unit 10, an optical pickup unit 15, an RF (radio frequency) amplifier and a focus / tracking error detector ( 20, servo signal processor 25, motor and driver 30, digital signal processor 35, MPEG-2 video decoder 40, AC-3 decoder 50, audio signal processor 55, video signal It is comprised and comprised the process part 45.

The optical pickup unit 15 performs optical pickup from the disk D loaded in the disk tray (not shown), and outputs an RF signal which is read accordingly.

In addition, the motor and the motor driving unit 30 drive the spindle motor (not shown) to rotate the disk D, and drive the pickup transport motor (not shown) so that the optical pickup unit 15 performs optical pickup. To read the data recorded on the disk D and output it as an RF signal.

The RF amplifier and tracking / focus error detection unit 20 amplifies the RF signal provided from the optical pickup unit 15 and provides it to the digital signal processing unit 35. The RF signal and the tracking / focus error detection unit 20 also detect the focus and tracking error signals from the signal, and then the servo signal. It is provided to the processing part 25.

The servo signal processor 25 provides the servo and the servo driver according to the focus and tracking error signals provided from the RF amplifier and the tracking / focus error detector 20 to the motor and the motor driver 30 to perform tracking and focus servo. .

The digital signal processor 35 digitally processes the amplified RF signal provided from the RF amplifier and the tracking / focus error detector 20, performs error detection and error correction, and then outputs the signal to the MPEG-2 decoder 40. do. The MPEG decoder 40 separates the digital signal in the form of an error-corrected bit stream provided from the digital signal processor 35 into a video signal and an audio signal, and then outputs the audio signal to the AC-3 decoder 50. The video signal is decoded based on the MPEG-2 video compression format and then output to the video signal processor 45.

The AC-3 decoder 50 decodes the audio signal encoded by the Dolby AC-3 scheme provided from the MPEG-2 video decoder 40 and provides the audio signal to the audio signal processor 55, and the audio signal processor 55 ) Outputs a speaker (not shown) by converting the decoded audio signal provided from the AC-3 decoder 50 into an audio signal processing and an analog signal.

The video signal processor 45 processes the decoded video signal provided from the MPEG-2 video decoder 40 and decodes and processes the sub picture signal to output the screen 60 to be displayed.

Meanwhile, the key input unit 5 provides a key signal for executing a predetermined function in the DVD player, and the control unit 10 transmits a control signal according to the key signal provided from the key input unit 5 to the respective components. The control unit 10 includes a timer (not shown) and a memory (not shown).

According to the present invention, when the key signal for changing the position of the caption from the key input unit 5 and the position of the caption to the desired position are input in the order as shown in FIG. 2, the controller 10 controls the control signal. And the input caption position data to the video signal processor 45 for processing the sub-picture signal. The video signal processor 45 determines the position of the subtitle from the next sub-picture by using the subtitle position data input from the controller 10 instead of the subtitle position data reproduced and provided according to the control signal provided from the controller 10. A sub-picture, i.e., subtitle data, processed on the screen, and the screen 60 displays it.

On the other hand, when a key signal for repositioning the caption position from the key input unit 5 is input, the controller 10 generates a control signal to the video signal processor 45 to erase the changed caption position data. 45 processes the sub-picture data according to the reproduced subtitle position data provided through the MPEG-2 video decoder and provides it to the screen 60 so that the subtitle is displayed at the original position.

4 is a flowchart of a method of changing a subtitle position in a digital video disc player according to a preferred embodiment of the present invention.

When the playback key signal is input in step S10 and playback is performed in step S20, it is determined in step S30 whether the caption position change key signal and the caption position data for caption position change are input. In step S30, if the caption position change key signal and the caption position data for caption position change are input, the process proceeds to step S40; otherwise, the process proceeds to step S60.

When the process proceeds from the step S30 to the step S40, the step S40 processes the sub-picture data according to the subtitle picture data input in the step S30 instead of the subtitle picture data which is reproduced and provided so that the subtitle is displayed. .

Then, in step S50, if the subtitle home position key signal for returning the position of the subtitle to the position before the change is input, the flow proceeds to step S60, otherwise the flow is fed back.

On the other hand, if step S30 or step S50 proceeds to step S60, in step S60, the position of the caption is determined and displayed according to the caption position data reproduced and provided from the disc, and then the flow ends. .

Accordingly, the present invention has the advantage that the position of the subtitle can be changed to the desired position and can be repositioned when the disc having the subtitle data is played in the digital video disc player.

While the invention has been shown and described with reference to certain preferred embodiments, those skilled in the art will recognize that various modifications and changes can occur without departing from the spirit and scope of the invention as set forth in the following claims.

Claims (1)

A method for changing the position of a subtitle displayed when playing a disc having subtitle data recorded with video data in a digital video disc player to a desired position, (A) determining whether the subtitle position change key signal and the subtitle position change data are inputted when a reproduction key signal is input and reproduction is executed; (B) If the subtitle position change key signal and the subtitle position change data are input in step (a), the original subtitle position data recorded at the time of disc production is replaced with the changed data, and the changed subtitle position data from the next sub picture. Changing and displaying the position of the subtitle according to; (C) determining whether a subtitle home position key signal for repositioning the subtitle is input; And (d) displaying the subtitles according to the original subtitle position data when the subtitle home position key signal is input in the step (c).