JP2002125202A - Closed-captioned broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a closed-captioned broadcast receiver that adjusts timing when a video image is displayed and timing when a closed caption corresponding to the video image is displayed in a broadcast program televised in real time such as a news closed-captioned broadcast so as to avoid contents of the broadcast program from being unintelligent due to a deviation in the displayed timing of the video image and that of the closed caption corresponding to the video image thereby preventing a satisfaction degree due to the dissidence between the video image and the caption from being decreased. SOLUTION: A video signal variable delay circuit 15 applies delay processing to an NTSC video signal. When a news closed-captioned broadcast is selected, a news closed captioned broadcast selection circuit 17 controls a switch 16, a signal superimposing circuit 14 receives the NTSC video signal subjected to the delay processing so as to superimpose the closed-caption signal generated by a closed captioned signal decoder 13 on the video signal subjected to the delay processing. Thus, a CRT 19 can display a video image and the closed- caption whose display timings are in matching with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subtitle broadcast receiving apparatus for teletext broadcasting of a television (hereinafter, referred to as "television"), and more particularly to a video and subtitle in a broadcast broadcasted in real time such as a news broadcast. And a technology for displaying at an appropriate timing.

[0002]

2. Description of the Related Art Text multiplex broadcasting is often used for television drama broadcasting and the like. In today's teletext broadcasting, subtitles are displayed at the bottom of the screen, with 15 characters per line, from one line to two characters.
The subtitles are displayed within the range of the line, displayed for about 6 seconds in consideration of the time taken by a human to read, and then the subtitles are superimposed on the video by a method of totally replacing two lines.

[0003] From April 2000 (Western calendar), news subtitle broadcasting for providing subtitles to video has started. In news subtitle broadcasting, the voice of an announcer is converted into subtitles in real time using voice recognition, and the subtitles are added to video. As described above, such text multiplex broadcasting can be used not only for drama broadcasting but also for news subtitle broadcasting and the like.

[0004]

By the way, in drama broadcasting, the display timing of video and subtitles coincides, but in news subtitle broadcasting and the like, the display timing of video and subtitles does not coincide, and subtitles are delayed with respect to video. Is displayed.

[0005] In a drama broadcast or the like, a video is recorded in advance, a subtitle is created by a word processor or the like, and the subtitle is added to the video. Uses an audio recognition system to add subtitles to video, so it takes time to send audio subtitles in a predetermined display format and to perform audio recognition processing and confirmation and correction of recognition errors in the process of automatically generating news subtitles. Is required.

According to the results of a subjective evaluation experiment on the presentation of subtitles, the permissible limit for the "shift" between the display timing of video and subtitles in news subtitle broadcasting is within about 2 seconds, and the limit of satisfaction with the delay time of subtitles. The value is about 2.
It is assumed to be within 5 seconds.

However, at present, the delay of the caption for this video is about 10 seconds. This subtitle delay may be shortened in the future, but it is inherently occurring. If there is a gap between the video and the subtitle display timing, viewers will have a major obstacle to understanding the news content, If the subtitles do not match, the viewer will be very dissatisfied. And this news subtitle broadcast itself,
Since it has just been started as described above, the importance of this problem and effective means for solving it have not been proposed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in a broadcast broadcasted in real time such as a news subtitle broadcast, the display timing of a video and a subtitle is adjusted so that the video and the It is an object of the present invention to provide a subtitle broadcast receiving apparatus capable of resolving a decrease in the degree of understanding of the content due to a shift in the timing with the display of subtitles, and a decrease in the degree of satisfaction due to a mismatch between the video and the subtitles.

[0009]

Therefore, a subtitle broadcast receiving apparatus according to the present invention receives a broadcast signal including a video signal and a subtitle signal from a broadcasting station, and adjusts a display time difference between the video and the subtitle. A subtitle broadcast receiving apparatus for displaying a video with a subtitle superimposed thereon, a broadcast signal receiving means for receiving a broadcast signal transmitted from the broadcast station, and generating a subtitle signal from the broadcast signal received by the broadcast signal receiving means The video signal is more advanced than the subtitle video signal among the broadcast signals received by the subtitle signal generation means and the broadcast signal receiving means, and the display time difference between the video and the subtitle is within a predetermined limit. Video signal delay means for delaying the video signal, and a caption signal generated by the caption signal generation means superimposed on the video signal delayed by the video signal delay means. And signal superimposing means for, and so comprises a display means for displaying the image and the caption, the based on the signal generated by the signal superposition means.

According to this configuration, the broadcast signal is received by the broadcast signal receiving means, and the subtitle signal generating means
A subtitle signal is generated from the broadcast signal. On the other hand, when the video signal is more advanced than the subtitle signal, the video signal is subjected to delay processing by the video signal delay unit so that the display time difference between the video and the subtitle is within a predetermined limit. And
A subtitle signal is superimposed on the delayed video signal,
The display timing of the video and the caption is adjusted.

[0011] In the subtitle broadcast receiving apparatus according to the second aspect of the present invention, the video signal delay is performed so as to delay the video signal so that the display time difference between the video and the subtitle is within an allowable limit based on the result of a subjective evaluation experiment on subtitle presentation. Means are configured. According to this configuration, the display time difference between the video and the caption is within the tolerance based on the result of the subjective evaluation experiment on the caption presentation.

In a third aspect of the present invention, the video signal delaying means and the signal superimposing means are constituted by a home server having a built-in memory. According to this configuration, the home server has a built-in memory, and the video signal is stored in the memory. The delay processing is performed by accumulating and outputting a video signal in the memory. It is also possible to superimpose the subtitle signal on the video signal on this memory, and a signal superimposition processing function is added to the delay processing function on the home server.

[0013] In the closed-caption broadcast receiving apparatus according to a fourth aspect of the present invention, the video signal delay means is configured to delay the audio signal together with the video signal so that the video and the audio correspond. According to this configuration, the audio signal is also delayed together with the video signal, and the video and the audio correspond, and the caption is superimposed on the video within a predetermined time difference.

In a preferred embodiment, when the subtitle signal of the broadcast signal received from the broadcast station corresponds to the video signal, the video signal and the subtitle signal received by the broadcast signal receiving means are provided. And switching control means for switching the signal path so as to directly output the signal path to the signal superimposing means.

According to such a configuration, for example, when the display time difference between the video and the caption is adjusted in advance by the broadcasting station, such as a broadcast signal of a drama broadcast, the caption signal corresponds to the video signal. At this time, switching control is performed by the switching control means, and the video signal and the subtitle signal are directly output to the signal superimposing means. That is, the video signal is output to the signal superimposing means without being subjected to the delay processing by the video signal delaying means, and the subtitle signal is output to the signal superimposing means as it is. Therefore, video and subtitles are displayed with the display time difference adjusted in advance by the broadcasting station.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment will be described. In the first embodiment, the video signal is delayed so that the display timings of the video signal and the subtitle signal substantially match.

FIG. 1 is a block diagram showing the configuration of the first embodiment. Subtitle broadcast receiving apparatus 1 of the present embodiment
Includes an antenna 11, a teletext tuner 12, a subtitle signal decoder 13, a signal superimposing circuit 14, a video signal variable delay circuit 15, a switch 16, a news subtitle broadcast selection circuit 17, a CPU 18, a CRT 19 , Is configured.

The antenna 11 receives an NTSC video signal and an audio signal transmitted from a television transmitter (not shown). The teletext tuner 12 selects a broadcast reception signal specified by the viewer from the reception signals received by the antenna 11, and extracts the specified NTSC video signal and audio signal. The antenna 11 and the teletext tuner 12 correspond to a broadcast signal receiving unit.

The subtitle signal decoder 13 is a subtitle signal generation means for decoding the NTSC video signal extracted by the teletext tuner 12 to generate a subtitle signal.
The signal superposition circuit 14 converts the subtitle signal decoder 13 into a video signal.
Is a signal superimposing means for superimposing the caption signal generated by the above. The video signal variable delay circuit 15 is a video signal delay unit that delays the video signal extracted by the teletext tuner 12 for a predetermined time.

The video signal variable delay circuit 15 has a function of making the delay time of the video signal variable. In the current news subtitle broadcast, the delay time of the subtitle signal is about 10 seconds, so that the video signal can be delayed up to this time. In this embodiment, the video signal variable delay circuit 15 is connected to the teletext tuner 1.
2, but may be provided inside.

The video signal variable delay circuit 15
The video signal is generally constituted by an image memory in order to delay the video signal by about 10 seconds, but for example, a hard disk which is a recording medium which is inexpensive, has a large capacity, and can be accessed at high speed can be used.

Further, the video signal variable delay circuit 15 and the signal superimposing circuit 14 can be constituted by a home server for home use. This home server has a large-capacity memory for storing video signals and the like. The delay processing is performed by accumulating the video signal in this memory and then outputting it with a delay. The superimposition processing of the delayed video signal and the subtitle signal is performed on this memory.

The switch 16 is connected to the video signal variable delay circuit 1
5 selects and outputs to the signal superimposing circuit 14 one of the video signal subjected to the delay processing and the video signal extracted by the teletext tuner 12 and not subjected to the delay processing. It is for.

The news subtitle broadcast selection circuit 17 controls switching of the switch 16. The news subtitle broadcast selection circuit 17 is manually controlled by the viewer, but will be automatically controlled in the future by utilizing index information such as a title, broadcast date and time, and content description multiplexed to the digital broadcast. You may. Note that the switch 16 and the news subtitle broadcast selection circuit 17 correspond to switching control means.

The CPU 18 controls each circuit in the subtitle broadcast receiving apparatus 1 and controls the delay time of the video signal. The CRT 19 is a display unit that displays a video and subtitles based on the signal generated by the signal superimposing circuit 14.

Next, the operation will be described. The NTSC video signal and the audio signal transmitted from the television transmitter are received by the antenna 11.

A broadcast reception signal specified by the viewer is selected by a teletext tuner 12 from among the reception signals received by the antenna 11, and an NTSC video signal and an audio signal are extracted.

The NTSC video signal is transmitted to the subtitle signal decoder 1
3 and a subtitle signal is generated. This caption signal is input to the signal superposition circuit 14.

When a news subtitle broadcast is broadcast, the news subtitle broadcast selection circuit 17 is manually controlled or controlled by index information multiplexed with digital broadcast, and the switch 16 is connected to the contact a.

FIG. 2 is an explanatory diagram showing the operation of the first embodiment. In the case of news subtitle broadcasting, a speech recognition system is used to add subtitles to the video, and in the automatic generation process of news subtitles in this system, after speech recognition processing and confirmation and correction of recognition errors have been performed, the system is switched to a predetermined display format. As shown in FIG. 2B, the caption signal is delayed from the video signal shown in FIG. 2A by the time t1.

At this time, the switch 16 is connected to the contact a side, and the NTSC video signal subjected to the delay processing by the video signal variable delay circuit 15 is input to the signal superposition circuit 14 via the switch 16.

In the video signal variable delay circuit 15, the CP
The delay time is controlled by U18, and a delay process for delaying the video signal by the time t1 so as to coincide with the display timing of the caption signal is performed.

In the signal superimposing circuit 14, a subtitle signal is superimposed on the NTSC video signal subjected to the delay processing. As shown in FIGS. 2A and 2B, when the NTSC video signal is set to have the same display timing as the subtitle signal,
A signal obtained by superimposing a subtitle signal on this NTSC video signal is CR
The video is output to T19, and the video and subtitles are displayed on the screen of the CRT 19 at the same time.

On the other hand, in the case of a drama broadcast, a broadcast signal is transmitted from a broadcast station. In the vertical retrace period (usually around 21H) of the NTSC video signal of the broadcast signal, the subtitle signal corresponds to the video signal. Are superimposed. This broadcast signal is generated by recording a video in advance, creating a subtitle using a word processor or the like, and superimposing the subtitle signal in a vertical blanking period of the NTSC video signal. Therefore, the display timing of the video and the caption is adjusted.

When such a broadcast signal of a drama broadcast is received, the switch 16 sets the news subtitle broadcast selection circuit 1
7 and is connected to the contact b side. When the switch 16 is connected to the contact b side, an NTSC video signal extracted by the teletext tuner 12 via the switch 16 is input to the signal superimposing circuit 14.

At this time, the subtitle signal is superimposed on the NTSC video signal at a display timing adjusted in advance by the broadcasting station that transmitted the broadcast signal, and the video and the subtitle are displayed on the CRT 19 at this timing.

According to this configuration, when news subtitle broadcasting is selected, the NTSC video signal is delayed for a predetermined time, and the subtitle signal is superimposed on the NTSC video signal so that the display timing of the video and the subtitle coincide. As a result, it is possible to eliminate a decrease in the degree of understanding of the content due to a timing difference between the video and the display of the subtitle corresponding to the video, and a reduction in the degree of satisfaction due to a mismatch between the video and the subtitle.

Note that the video signal is delayed, but if the delay is about 10 seconds, the viewer is watching the news with such a time difference. Does not matter at all.

Also, in the present embodiment, the NTSC video signal is delayed so that the display timing of the video and the subtitle completely match, but the display timing of this video and the subtitle is within a predetermined allowable limit. I just need.

For example, as shown in FIG. 2 (c), the video signal may be further delayed by the time t2 than the subtitle signal and the subtitle may be displayed prior to the video, or vice versa. There may be.

As described above, according to the results of the subjective evaluation experiment on the presentation of subtitles, the permissible limit for humans with respect to the “shift” between the display timing of the video and subtitles in news subtitle broadcasting is within about 2 seconds, and the degree of satisfaction with the subtitle delay time. Is within about 2.5 seconds.

Therefore, in order to eliminate the above-mentioned decrease in the degree of understanding and satisfaction, the NTSC must be within the allowable limit.
What is necessary is just to delay the video signal. With such a delay, high-precision control is not required for the video signal variable delay circuit 15, so that the delay processing can be easily realized.

If displaying the subtitles prior to the video makes the understanding of the contents higher, the above-mentioned FIG.
As shown in (c), the video signal is made slower than the subtitle signal within this allowable limit.

Next, a second embodiment will be described. News subtitles are not just for the hearing impaired. That is, the elderly deaf and healthy people also watch.
These viewers watch the news subtitle broadcast while listening to the audio. In this case, it is necessary to delay the audio signal for a required time simultaneously with the delay of the video signal.

In the second embodiment, in consideration of this point, the audio signal is delayed together with the video signal so that the video and the audio substantially match. The configuration of the second embodiment is the same as the configuration of FIG. 1 except that the teletext tuner 12 has a function of extracting an audio signal, and the video signal variable delay circuit 15 converts the audio signal together with the video signal. Also has a function of delaying a predetermined time, and the signal superimposing circuit 14
It has a function of superimposing a subtitle signal on a video signal with an audio signal.

Next, the operation will be described. FIG. 3 is an explanatory diagram showing the operation of the second embodiment. As shown in FIG.
As shown in (b), in the second embodiment, in the video signal variable delay circuit 15, the video signal is processed so as to be delayed by the time t1, and the audio signal is also substantially equal to the video signal. Delay processing is performed. The first
Similarly to the embodiment, as shown in FIG. 3B, the video signal and the audio signal may be further delayed than the subtitle signal by the time t2.

When the news subtitle broadcast is selected, the switch 16 is connected to the contact a by the news subtitle broadcast selection circuit 17 so that the NTSC video signal and the audio signal subjected to the delay processing are converted into the video signal variable delay circuit. 15 is input to the signal superimposing circuit 14 via the switch 16.

In the signal superimposing circuit 14, a subtitle signal is superimposed on the NTSC video signal subjected to the delay processing. FIG.
As shown in (a) and (b), when the video signal and the audio signal are delayed by the time t1, the NTSC video signal and the subtitle signal are superimposed at the same timing.

Then, the NTSC video signal on which the subtitle signal is superimposed is output to the CRT 19, and the video and the subtitle whose display timing matches the subtitle are displayed on the screen of the CRT 19, and a speaker (not shown) is displayed at the same timing as the video. ) Outputs sound.

On the other hand, when the broadcast signal for the drama broadcast is transmitted, the switch 16 is connected to the contact b side under the control of the news subtitle broadcast selection circuit 17, and is kept extracted from the teletext tuner 12. The NTSC video signal that has not been subjected to the delay processing is input to the signal superimposing circuit 14 via the switch 16, and the subtitle signal is superimposed on the video signal, and the video and the subtitle are displayed at the display timing adjusted in advance by the broadcasting station. Is displayed, and audio is output from the speaker at the same timing as the video.

According to such a configuration, the audio signal is delayed together with the video signal so that the video and the audio substantially match, so that the news subtitle broadcast can be viewed while listening to the audio like an elderly deaf or healthy person. Even when the video is displayed, it is possible to eliminate a decrease in the degree of understanding of the content due to a timing difference between the video and the display of the subtitle corresponding to the video, and a reduction in the degree of satisfaction due to the mismatch between the video and the subtitle.

[0052]

As described above, according to the subtitle broadcast receiving apparatus according to the first aspect of the present invention, when the video signal of the received broadcast signal is more advanced than the subtitle signal,
The video signal is delayed for a predetermined time, and a caption signal is superimposed on the video signal so that the display time difference between the video and the subtitle is within a predetermined limit. It is possible to eliminate a decrease in the degree of understanding of the content due to the deviation, and to eliminate a decrease in the degree of satisfaction due to the mismatch between the video and the caption. In particular, the effect is great in a broadcast broadcasted in real time such as a news subtitle broadcast.

According to the subtitle broadcast receiving apparatus according to the second aspect of the present invention, the video signal is delayed such that the display time difference between the video and the subtitle is within an allowable limit based on the result of a subjective evaluation experiment on subtitle presentation. High-precision control is not required for the delay processing, and the delay processing is easily realized.

According to the subtitle broadcast receiving apparatus of the third aspect of the present invention, by utilizing the video signal accumulation function of the home server having a built-in memory, the delay processing function is performed on the home server to convert the subtitle image to the video. A signal superposition processing function can be added.

According to the fourth aspect of the present invention, the audio signal is delayed together with the video signal so that the video and the audio substantially coincide with each other. And the caption is superimposed on this video within a predetermined time difference.

According to the subtitle broadcast receiving apparatus of the fifth aspect, when the subtitle signal of the broadcast signal received from the broadcast station corresponds to the video signal, the video signal received by the broadcast signal receiving means and Since the signal path is switched so as to directly output the caption signal to the signal superimposing means, the video and the caption can be displayed with the display time difference adjusted in advance by the broadcasting station.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an operation of the first exemplary embodiment of the present invention.

FIG. 3 is an explanatory diagram showing an operation of the second exemplary embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Subtitle broadcast receiver 13 Subtitle signal decoder 14 Signal superposition circuit 15 Video signal variable delay circuit 16 Switch 17 News subtitle broadcast selection circuit 19 CRT

Claims (5)

[Claims] 1. A subtitle broadcast receiving apparatus for receiving a broadcast signal including a video signal and a subtitle signal from a broadcast station, adjusting a display time difference between the video and the subtitle, and displaying a video in which the subtitle is superimposed, wherein the broadcast station Broadcast signal receiving means for receiving a broadcast signal transmitted from the broadcast signal receiving apparatus, a caption signal generating means for generating a caption signal from the broadcast signal received by the broadcast signal receiving means, and a broadcast signal received by the broadcast signal receiving means. When the video signal is more advanced than the subtitle video signal, a video signal delay unit that delays the video signal so that a display time difference between the video and the subtitle is within a predetermined limit; and a delay by the video signal delay unit. Signal superimposing means for superimposing the caption signal generated by the caption signal generating means on the video signal which has been subjected to the conversion processing, based on the signal generated by the signal superimposing means. Subtitles broadcast receiving apparatus characterized by comprising a display means for displaying the video and subtitles are. 2. The video signal delay means is configured to delay a video signal such that a display time difference between a video and a subtitle is within an allowable limit based on a result of a subjective evaluation experiment on subtitle presentation. The subtitle broadcast receiving device according to claim 1. 3. The subtitle broadcast receiving device according to claim 1, wherein the video signal delay unit and the signal superimposing unit are configured by a home server having a built-in memory. 4. The video signal delay means according to claim 1, wherein the video signal delay means is configured to delay the audio signal together with the video signal so that the video and the audio correspond to each other. The subtitle broadcast receiving device according to the paragraph. 5. When a subtitle signal of a broadcast signal received from a broadcasting station corresponds to a video signal, the video signal and the subtitle signal received by the broadcast signal receiving means are directly output to the signal superimposing means. The subtitle broadcast receiving apparatus according to any one of claims 1 to 4, further comprising switching control means for switching a signal path.