JP3902420B2 - Optical disk playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical disc reproducing apparatus such as a DVD player.
[0002]
[Prior art]
An optical disc playback device has been developed that reads a bit stream from a recording medium on which a bit stream consisting of compressed video and audio signals is recorded, decodes the read bit stream into the original video symbols and audio signals, and performs playback. This is well known. One of the optical disk playback devices is a DVD player.
[0003]
Display of subtitles reproduced by a DVD player is turned on / off by a display control command in an SPU (sub-picture unit) recorded on the DVD, and is forcibly displayed when the valid period of the SPU ends. Turned off. Here, the valid period of the SPU is a period from the PTS (display start time) of the SPU to the PTS of the SPU to be reproduced next. That is, the display of subtitles is turned on / off based on the data recorded on the disc.
[0004]
In recent years, for the purpose of shortening time and the like, DVD players having a function capable of fast-forwarding and reproducing images recorded on a DVD have been developed. When such fast-forward playback is performed, subtitles are switched quickly, so that there is a problem that subtitles are difficult to read.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide an optical disc playback apparatus that makes it easy to read subtitles during fast-forward playback.
[0006]
[Means for Solving the Problems]
The optical disc playback apparatus according to the present invention displays the (n + 1) th subtitle at the first subtitle display position when the nth subtitle displayed at the predetermined first subtitle display position is deleted during fast-forward playback. And a means for displaying the n-th subtitle at a predetermined second subtitle display position.
[0007]
When the subtitle displayed at the second subtitle display position is not updated within a predetermined time, it is preferable to provide means for deleting the subtitle.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is applied to a DVD player having a fast-forward playback function will be described.
[0009]
FIG. 1 shows the configuration of a DVD player.
[0010]
The drive unit 1 reads information from the disk. The bit stream read by the drive unit 1 is sent to the AV decoder 2.
[0011]
The AV decoder 2 demultiplexes the bit stream sent from the drive unit 1 into PCI information (playback control information), video information, sub-picture information, and audio information by an internal DEMUX (demultiplexer), Decoding is performed by a decoder, a video decoder, a sub-picture decoder, and an audio decoder. Each decoded information is stored in the memory 3 inside the AV decoder which can be read by the CPU 6.
[0012]
The decoded audio signal, video signal and sub-picture signal are synchronized at a predetermined transfer timing, the audio signal is output as audio, and the video signal and sub-picture signal are transmitted to the video mixer 7.
[0013]
Operation signals from the user (remote control signals and key input signals from the remote controller) are input to the CPU 6 via the user interface unit 4. The on-screen generator 5 generates graphic information according to instructions from the CPU 6 and sends it to the video mixer 7. The video mixer 7 mixes the video signal and sub-picture signal sent from the AV decoder 2 and the graphic information sent from the on-screen generator 5 into one video signal, and outputs the video.
[0014]
The DVD player has a fast-forward playback function. The DVD player has a function of displaying subtitles by display control different from normal display control during fast-forward playback.
[0015]
A subtitle data display method during fast-forward playback will be described with reference to FIG.
[0016]
Here, it is assumed that the caption is displayed horizontally. The upper left corner of the video display area is the origin (0, 0), and the caption is displayed from the position (x1, y1) in the video display area. The width of the caption data is Xs and the height of the caption data Ys.
[0017]
A caption data display area starting from the position (x1, y1) is referred to as a first display area S1. In this embodiment, the second display area S2 is set in addition to the first display area S1 as an area for displaying the caption. The second display area S2 starts from the position (x1, y1-Ys-1).
[0018]
Subtitle data in units of SPU (sub-picture units) decoded by a DVD player is represented by SPU (n), SPU (n + 1), SPU (n + 2). As shown in FIG. 3, the subtitle data is stored in the memory 3 and then mixed with the video data and displayed at a predetermined display start timing. Note that the memory 3 has an area where a plurality of SPUs can be stored, and the SPUs are stored cyclically.
[0019]
Hereinafter, a subtitle display processing procedure executed by the CPU 6 during fast-forward playback will be described.
[0020]
(1) First, caption data SPU (n) is read from the memory 3 and displayed in the first display area S1.
(2) When the display control command of the caption data SPU (n) is turned off or the valid period of the caption data SPU (n) is expired (the display start time of the next caption data SPU (n + 1) to be reproduced) The display of the subtitle data SPU (n) displayed in the first display area S1 is turned off, and the subtitle data SPU (n) is read from the memory 3 again, and the second display area Display in S2.
(4) Thereafter, the caption data SPU (n + 1) is read from the memory 3 and displayed in the first display area S1.
[0021]
(5) When the display control command of the caption data SPU (n + 1) is turned off or when the valid period valid period of the caption data SPU (n + 1) ends (the display start time of the next reproduced caption data SPU (n + 2)) Is turned off), the display of the caption data SPU (n + 1) displayed in the first display area S1 is turned off, and the caption data SPU (n + 1) is read from the memory 3 again, and the second display area Display in S2. That is, the caption data displayed in the second display area S2 is switched from SPU (n) to SPU (n + 1).
(6) Thereafter, the caption data SPU (n + 2) is read from the memory 3 and displayed in the first display area S1.
[0022]
Thereafter, such processing is repeated. In order to prevent the caption data displayed in the second display area S2 from being continuously displayed, the display is erased when the caption data displayed in the second area S2 is not updated within a predetermined time. It is preferable to do so.
[0023]
According to the above embodiment, the subtitle data display time becomes longer during fast-forward playback, so that the subtitle can be read easily.
[0024]
【The invention's effect】
According to the present invention, during fast-forward playback, when the nth subtitle displayed at the predetermined first subtitle display position is deleted, the nth subtitle is displayed at the predetermined second subtitle display position. Therefore, at the time of fast-forward playback, after the nth subtitle is displayed at the predetermined first subtitle display position, the nth character is displayed at the predetermined second subtitle display position continuously. it can. Therefore, the continuous display time of the nth subtitle becomes long, and it is possible to make the nth subtitle easy to read even during fast-forward playback.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the configuration of a disc playback apparatus.
FIG. 2 is a schematic diagram for explaining a subtitle data display method during fast-forward playback.
FIG. 3 is a schematic diagram showing SPUs stored in a memory 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drive part 2 AV decoder 3 Memory 4 User interface part 5 On-screen production | generation part 6 CPU
7 Video mixer

Claims (2)

  During fast-forward playback, when the nth subtitle displayed at the predetermined first subtitle display position is deleted, the n + 1st subtitle is displayed at the first subtitle display position and the predetermined second subtitle is displayed. An optical disk reproducing device comprising means for displaying the nth subtitle at a display position.   2. The optical disc playback apparatus according to claim 1, further comprising means for deleting a subtitle displayed at the second subtitle display position when the subtitle is not updated within a predetermined time.

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