JPH0219088A - Screen display device - Google Patents

Abstract

PURPOSE:To prevent missing of a screen picture by coding and superimposing screen picture signals in other processing from a video signal so as to display a screen picture on an optional position on the screen. CONSTITUTION:A means 14 coding the screen picture signal and a means 16 superimposing a screen picture signal onto a video signal are provided to the sender side, and a means 17 separating the screen picture signal 15 subject to video/audio/coding respectively, a means 18 decoding a screen data, a means 20 superimposing a screen picture signal 21 onto the video signal and a means 19 controlling the superimposing position of the screen picture are provided to the reception side. Thus, the screen picture signal is superimposed on the video signal as a coded digital signal in addition to the video signal and the reception side decodes its screen data independently to obtain the screen picture signal in addition to the video signal. Thus, it is possible to superimpose the screen picture on an optional position onto the screen and the missing of screen picture due to signal form conversion is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an apparatus for displaying subtitles in high-definition television broadcasting such as high-definition broadcasting.

BACKGROUND OF THE INVENTION In recent years, experiments have been conducted on new television broadcasting systems such as high-definition broadcasting, and they are rapidly approaching the stage of practical use. However, even for new broadcasting systems that are incompatible with conventional television broadcasting systems, methods are being considered that use signal format conversion means so that they can be displayed on conventional television receivers. Here, the display of subtitle images of programs when using this signal format conversion means will be described below with reference to the drawings.

FIG. 2 shows a functional block diagram of a transmitting side and a receiving side of a conventional subtitle display device. In FIG. 2, 1 is the original image signal, that is, the original video signal of the broadcast program;
2 is a subtitle image signal that is superimposed on the original image signal. This is, for example, a score display, an out count display, etc. in a baseball live broadcast. The original image signal 1 and the subtitle image signal 2 are superimposed by a superimposition device 5, and processed by a video processing unit 4 such as conversion into a signal format necessary for transmission.

3 is an original audio signal, and the audio processing unit 7 performs processing such as converting it into a signal format necessary for transmission. 6 is a superimposition device that combines video and audio into one signal.

Reference numeral 8 on the receiving side is a video/audio separation processing unit that performs processing to separate a video signal and an audio signal from the received signal. 9 is a video processing unit that performs video processing such as demodulation processing on the video signal separated by the video and audio separation processing unit 8; 10 is a video processing unit that performs video processing such as demodulation processing on the video signal separated by the video and audio separation processing unit 8; This is a signal format conversion unit that performs signal format conversion processing to enable display in . 12 is a video signal converted so that it can be displayed on a conventional television receiver, and a subtitle image is superimposed on the original image. 11
is an audio processing unit that performs demodulation processing and the like on the audio signal separated by the video/audio separation processing 8. 13 is the resulting audio signal.

In the subtitle display device configured as above, the relationship between the signal format conversion process 10 and subtitle images will be further explained with reference to FIG. 3.

FIG. 3 is a diagram showing, as an example, a live baseball broadcast, what will be displayed on the screen when a high-definition broadcast signal is converted to a signal format and displayed on a conventional television receiver. be. The aspect ratio of a No. 1 vision image is 16:9, which is a horizontally long image compared to 4:3 in conventional NTSC. In order to match this to NTSC, signal format conversion is performed on the receiving side. At this time, one method is to match the aspect ratio by converting the left and right edges of the original high-definition image, that is, the conventional aspect ratio. In this case, a method is taken to delete the video information of the part that protrudes to the side.

Problems to be Solved by the Invention However, in the above configuration, it is difficult to cut off both ends of the image in the horizontal direction, as in the example shown in FIG.
However, since the superimposed subtitles are also cut off at the same time, there is a problem in that important information called subtitles is missing.

In view of the above problems, the present invention provides a subtitle display device that does not cause missing subtitle images even when signal format conversion is performed.

Means for Solving the Problems In order to solve the above problems, the subtitle display device of the present invention has the following features:
On the transmission side, means for encoding the subtitle image signal;
means for superimposing the encoded subtitle image signal on the video signal, and means for separating the video, audio, and subtitle data (encoded subtitle image signal), respectively, on the receiving side, and decoding the subtitle data. The apparatus includes means for superimposing a subtitle image signal on a video signal, and means for controlling a superimposition position of the subtitle image.

According to the above-described configuration, the present invention superimposes the subtitle image signal on the video signal as an encoded digital signal separately from the video signal, and independently decodes the subtitle data on the receiving side, thereby combining the subtitle image signal with the video signal. A subtitle image signal can be obtained separately, and as a result, it becomes possible to superimpose a subtitle image at any position on the screen, and it is possible to solve the problem of missing subtitle images due to signal format conversion.

Embodiment Hereinafter, a subtitle display device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows functional blocks on the transmitting side and receiving side of a subtitle display device in an embodiment of the present invention. In FIG. 1, 14 is an encoding processing unit that encodes the subtitle image signal 2, and 15 is encoded digital subtitle data. 16 is a video signal, an audio signal, and subtitle data 1
5 into one signal. Reference numeral 17 denotes a video/audio/subtitle data separation unit that separates video, audio, and subtitle data from the received signal. 18 is a subtitle data decoding unit that decodes digital subtitle data;
is a subtitle image signal obtained by the subtitle data decoding section 18. Reference numeral 19 denotes a superimposition position control unit that controls the superimposition position (horizontal direction, vertical direction) when superimposing the subtitle image signal 21 on the video signal.

2o is '!' obtained by the signal format converter 10. & A superimposition device that superimposes a subtitle image signal onto an image signal.

According to this configuration as described above, the subtitle image signal is transmitted separately from the video signal, and on the receiving side, they are superimposed,
As a result, even after signal format conversion, there will be no loss of subtitle images, and even if signal format conversion is not performed, superimposition position control allows subtitles to be placed in the optimal position. Images can be displayed.

Effects of the Invention As described above, the present invention encodes and superimposes the subtitle image signal separately from the video signal, thereby making it possible to display the subtitle image at any position on the screen at the time of reception. As a result, there will be no loss of subtitle images.

[Brief explanation of the drawing]

Fig. 1 is a functional block diagram of a subtitle display device according to an embodiment of the present invention, Fig. 2 is a functional block diagram of a conventional subtitle display device, and Fig. 3 is a screen when a high-definition television signal is converted into a signal format. It is a front view of an example of a display. 14... Encoding processing unit, 16... Signal superimposition unit, 17... Signal separation processing unit, 18...
. . . Subtitle data decoding processing section, 19 . . . Subtitle image signal superimposition position control unit, 20 . . . Subtitle image superimposition device. Name of agent: Patent attorney Shigetaka Awano

Claims (1)

[Claims] A subtitle data encoding means for encoding a subtitle image signal to be displayed superimposed on an original image signal, and a signal superimposing means for synthesizing and superimposing the encoded subtitle data, the original image signal, and an audio signal. on the transmitting side, and on the receiving side, a signal separating means for separating an image signal, an audio signal, and encoded subtitle data from the received signal, and a signal separating means for decoding the separated subtitle data to generate a subtitle image signal. A subtitle display comprising: a subtitle data decoding means for obtaining subtitle data, a superimposition position control means for controlling a position at which a subtitle image is superimposed on an image signal, and an image signal superimposition means for superimposing a subtitle image and an image signal. Device.