JP2007324872A - Delay controller and delay control program for video signal with closed caption - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reproduce video and closed captions in real time closed caption broadcast by completely synchronizing the video and the closed captions on a time axis. <P>SOLUTION: A video signal with closed captions included in broadcast waves of a closed caption broadcast program is received by a receiving part and a closed caption signal is extracted. The video signal is delayed by a prescribed fixed delay time. The video signal with the closed captions includes closed captions character information of a closed caption page unit and input delay time information of each closed caption page required from the input start of a closed caption character till the transmission of the closed caption data. A closed caption delaying part calculates a variable delay time by subtracting an input delay time from the fixed delay time for each closed caption page on the basis of the input delay time information and delays a closed caption signal by the variable delay time corresponding to the closed caption signal. A closed caption synchronized video signal obtained by synchronizing the video and the closed captions is generated by synthesizing a delayed video signal and the delayed closed caption signal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for reproducing video and subtitles corresponding to the video in time synchronization based on a video signal with subtitles such as subtitle broadcasting.

  In live TV programs such as news, subtitles are increasingly being broadcast as a service for the hearing impaired. In this “live” subtitle broadcast (called “live subtitle broadcast”, “real-time subtitle broadcast”, etc.), the subtitles are sometimes broadcast with a delay of several seconds to several tens of seconds, and viewers feel uncomfortable. Sometimes.

  In analog broadcasting, caption data is superimposed on a vertical blanking interval (VBI) of a video signal. In a normal recorded program with captions, captions can be produced in advance, and caption data can be transmitted in units of pages at a timing that perfectly matches the video. On the other hand, in a live caption program, caption superimposition is performed at a timing delayed from the video. This is because the subtitle input person at the broadcasting station inputs the subtitle text while watching the video to be broadcast, and superimposes the subtitle for the first time after performing kanji conversion, incorrect conversion correction, etc., so there is a delay in time. Yes (hereinafter, this delay is referred to as “caption delay”). Therefore, if the caption delay is large, the viewer will see the caption several seconds after the video is displayed, and will feel uncomfortable.

  For example, Patent Documents 1 and 2 propose a method for compensating for such caption delay.

JP 2004-215033 A Japanese Patent Application Laid-Open No. 2004-207821

  The present invention has been made in view of the above points, and provides a caption control device and program for a video signal with subtitles capable of reproducing video and subtitles in a live subtitle broadcast in a completely synchronized manner on a time axis. The purpose is to provide.

  In one aspect of the present invention, a delay control device for a captioned video signal includes: a receiving unit that receives a captioned video signal; an extraction unit that extracts a caption signal from the captioned video signal; A video delay unit that generates a delayed video signal, a subtitle delay unit that generates a delayed subtitle signal by delaying the subtitle signal by a variable delay time according to the subtitle signal, and the delay A synthesizing unit that synthesizes the video signal and the delayed subtitle signal to generate a subtitle-synchronized video signal in which the video and the subtitle are synchronized, and the video signal with subtitle includes subtitle character information in units of subtitle pages, subtitle Input delay time information for each subtitle page required from the start of character input to the transmission of the subtitle data, and the subtitle delay unit calculates the input delay time from the fixed delay time for each subtitle page. By calculation to, calculates the variable delay time.

  The delay control device is arranged in an environment for receiving a caption broadcast transmitted from a broadcasting station, and can be incorporated in, for example, a TV receiver or an HDD recorder. The subtitle-added video signal included in the broadcast wave of the subtitle broadcast program is received by the receiving unit, and the subtitle signal is extracted. The video signal is delayed by a predetermined fixed delay time. The subtitle-added video signal includes subtitle character information in units of subtitle pages and input delay time information for each subtitle page required from the start of subtitle character input to the transmission of the subtitle data. The subtitle delay unit calculates the variable delay time by subtracting the input delay time from the fixed delay time for each subtitle page based on the input delay time information, and delays the subtitle signal by the variable delay time according to the subtitle signal Let Then, by synthesizing the delayed video signal and the delayed caption signal, a caption synchronized video signal in which the video and the caption are synchronized is generated.

  In a preferred example, the input delay time information is transmitted by being included in a page data header in page management information defined in a text broadcasting technical standard in analog television. In another preferred example, the input delay time information is transmitted by being included in a caption data stream defined in the ARIB technical standard in digital television.

  In one aspect of the delay control device, the fixed delay time is set to be larger than a maximum caption delay time of the caption signal included in the captioned video signal. Thereby, the difference in input delay time for each page can be absorbed, and the video and subtitles can be synchronized for all pages.

  In another aspect of the present invention, a video / audio playback device with subtitles and a delay control device for a video signal with subtitles described above receive audio signals and generate a delayed audio signal by delaying by the fixed delay time. A delay unit, and a reproduction unit that reproduces the caption synchronized video signal and the delayed audio signal. In addition to the above-described delay control device for video signals with captions, playback that enables synchronized playback of subtitles of live subtitle broadcast programs and video and audio by delaying the audio signal with the same fixed delay time as the video signal An apparatus can be provided.

  In still another aspect of the present invention, a delay control program for a captioned video signal is executed by a computer terminal, thereby receiving a captioned video signal, and extracting the caption signal from the captioned video signal An extraction unit, a video delay unit that delays the video signal by a predetermined fixed delay time, generates a delayed video signal, and delays the caption signal by a variable delay time corresponding to the caption signal to generate a delayed caption signal A subtitle delay unit, and a synthesizing unit that combines the delayed video signal and the delayed subtitle signal to generate a subtitle synchronized video signal in which the video and the subtitle are synchronized; Includes subtitle character information for each subtitle page, input delay time information for each subtitle page required from the start of input of subtitle characters to transmission of the subtitle data, Wherein the subtitle delay unit, by subtracting the input time delay from the fixed delay time for each subtitle page, calculates the variable delay time.

  By executing the above program on a computer, it is possible to implement the delay control device for captioned video signals of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(Subtitle broadcasting system)
FIG. 1 shows an example of a caption broadcasting system to which a delay compensation method for captioned video signals according to the present invention is applied. In FIG. 1, the broadcasting station 10 performs subtitle television broadcasting for the user environment 50. In the broadcast station 10, the caption broadcast transmission system 20 creates a video signal with captions and transmits it on the broadcast wave 40. In the user environment 50, the caption delay control device 60 receives the broadcast wave 40, performs delay control of the caption signal, and includes a captioned video signal in which the video and the caption are synchronized on the time axis (also referred to as “caption synchronized video signal”). And the audio signal are generated and supplied to the TV receiver 52. The TV receiver 52 reproduces the caption synchronized video signal and the audio signal. Thereby, the user can view the live subtitle broadcast with the video and the subtitle synchronized in time.

(Subtitle delay)
Next, caption delay that occurs in live caption broadcasting will be described. Programs such as television are roughly classified into package programs recorded in advance on a VTR and live broadcast programs such as news. When subtitles are given to these programs, in a package program, a video signal and a subtitle signal are recorded and broadcast together in a VTR, etc., and a video signal is recorded in a VTR and the subtitle signal is added during broadcasting. There are methods, both of which are package subtitle broadcast programs. Also, there are live subtitle (real-time subtitle) broadcast programs that add subtitles in real time when broadcasting live broadcasts such as news programs.

  In the case of a live subtitle broadcast program, subtitles are generated in real time during the live broadcast of the TV video, and inserted into the TV video for broadcast. Become. Hereinafter, the subtitle transmission delay in live subtitle broadcasting will be briefly described.

  Broadcasting subtitles as a service for the hearing impaired on live TV programs such as news is increasing. In this live subtitle broadcast, the subtitle is sometimes broadcast with a delay of several seconds to several tens of seconds with respect to the video, and if this delay is large, the viewer may feel uncomfortable.

  In analog broadcasting, caption data is superimposed on the video during the vertical blanking interval (VBI) of the video. For packaged subtitle broadcast programs, subtitles can be produced in advance and subtitle data can be sent in page units at the timing that perfectly matches the video. However, in real-time subtitle programs, the subtitle superimposition timing is not real time as shown in FIG. This is done at a slightly delayed timing. This is because a subtitle input person at a broadcasting station inputs subtitle text while watching the video to be broadcast, creates subtitle data after performing kanji conversion, incorrect conversion correction, etc., and then superimposes the subtitle data. This is because the transmission of subtitle data is delayed from the video. In FIG. 2, the difference between the input start timing of subtitles and the timing at which the corresponding subtitle data is superimposed, that is, the delay time due to subtitle input (hereinafter also referred to as “input delay time”) is indicated by ΔT. ing. The content of subtitles differs for each video cut, and the time required to create subtitle data differs accordingly, so the input delay time ΔT differs for each video cut (ΔTa to ΔTc).

  For example, in the case of a news program, when an announcer reads a news article, the content is acquired by voice recognition, etc., and subtitles are generated and added to the TV video. In addition, subtitles may be inserted when the announcer's voice ends and moves to the next news item.

  As a real-time caption generation method, a voice recognition method that uses voice recognition based on an utterance of an announcer, a keyboard method that generates a caption by key input of broadcast sound by an input operator, and the like are known.

  For this reason, in the video signal with subtitles of the live subtitle broadcast program, the content of the video (frame image) and the subtitles do not coincide with each other in time. That is, subtitles corresponding to a certain video are included in a frame image signal that is delayed from the video by several frames to several hundred frames.

  The caption delay will be described in detail with reference to FIGS. In the broadcast of ordinary subtitled programs, it is possible to create subtitles according to the program contents in advance and add subtitle data to the video signal at the timing appropriate for the video. Does not occur. Similarly, in live broadcasting, for example, as shown in FIG. 3, when a person speaks in accordance with a video (comments 1, 2,. It is desirable to superimpose captions at the same time. However, in fact, at the production site on the broadcasting station side, the caption creator listens to a person's comments, summarizes it, and inputs the key as a character string, and performs kanji conversion, correction of erroneous conversion, etc. Is created. After being created in this way, the caption data is broadcast by being added to the video signal as caption page data for each page. Therefore, in practice, as shown in FIG. 4, ΔT1, ΔT2,..., It is inevitable that the receiver displays the subtitles delayed by the time required for the operation (that is, the input delay time ΔT). Although the input delay time ΔT varies depending on the length and complexity of the subtitle page content, the input delay time ΔT ranges from several seconds to more than a few tens of seconds. A technology for displaying subtitles naturally by compensating the subtitle delay and matching the timing of video / audio and subtitles is desired by broadcasters and hearing impaired people.

(Subtitle delay compensation)
Next, a caption delay compensation method according to the present invention will be described. FIG. 5 shows the time relationship between video / audio and subtitles when subtitle delay compensation is performed according to the present invention. A caption delay compensation unit provided in the television receiver always displays and outputs the received video / audio signal with a fixed delay time Dfix. Also, when a certain subtitle page is received, values such as input delay times ΔT1 and ΔT2 transmitted along with it are used,
Variable delay time (Dvar) = fixed delay time (Dfix) −input delay time (ΔT) (1)
The variable delay time Dvar is calculated by the following equation, and the caption is delayed and displayed by this variable delay time Dvar. As a result, the video / audio is output with a delay of a certain time (that is, a fixed delay time Dfix) from the actual broadcast. Subtitle 1 and subtitle 2 are combined into a video and output at a timing that is appropriately matched with comment 1 and comment 2 (that is, in synchronization). Note that the fixed delay time Dfix needs to be set larger than the maximum input delay time ΔT that can occur in actual live subtitle broadcasting.

  In order to realize subtitle delay compensation according to the present invention, it is assumed that a station that broadcasts a live subtitle program broadcasts information on the input delay time ΔT together with the subtitle data for each subtitle page. The input delay time information may be time data in seconds or counter value data counted in an appropriate cycle. Here, a case in which seconds are used will be described. About 0.5 seconds is sufficient for the timing accuracy required for subtitle delay compensation, and the maximum input delay time ΔT is about 20 or more seconds in an example of an actual program. Therefore, the input delay time information can be represented by a 6-bit binary value counted in units of 0.5 seconds, for example. In this case, the expressible delay time is 0 to 31.5 seconds in 0.5 second increments, which is a sufficient value. An example of the data structure of the input delay time information is shown in FIG.

(Input delay time information transmission method)
Next, a method for transmitting a captioned video / audio signal including input delay time information by the broadcast station will be described.

  In order to transmit the input delay time information, it is first necessary to provide the following functions to the live caption input device and caption transmission device in the broadcasting station.

    (1) For each character string, the actual time (referred to as “input start time”) at that moment is stored by a specific operation performed by the caption input person at the start of input.

    (2) When the subtitle input person finishes the conversion of Kanji characters and confirms the contents of the input character string and instructs transfer to the subtitle transmission apparatus, the stored input start time is added to the subtitle data to the subtitle transmission apparatus. To transmit.

    (3) When the caption transmission device broadcasts the caption data superimposed on the video signal, the caption transmission device calculates information obtained by subtracting the input start time from the current time at the time of broadcasting, and is broadcast as input delay time information. To multiplex and broadcast.

  FIG. 7 schematically shows the flow of live subtitle broadcasting using these functions. In FIG. 7, in the production process of live subtitles, each time subtitle input is required in a live program, subtitle character string data in units of live subtitles from one or more subtitle input devices, Combined with the time data when the input is started ("input start time data"), it is sent to the caption transmission buffer in the order of the input start time.

  In subsequent subtitle transmission processing, the subtitle transmission device starts input from the actual time at the time of transmission for each subtitle page at an appropriate interval that is easy for the viewer to read if there is data in the subtitle transmission buffer. The input delay time information is generated by converting the input delay time obtained by subtracting the time into a 6-bit binary value in 0.5 second increments. Then, the caption transmission device stores the input delay time information together with the character string data of each page in an appropriate field, which will be described later, and multiplexes and broadcasts the video / audio as a caption broadcast. Thereby, the broadcast station can transmit to the receiver of the viewer including the input delay time information for each page during the caption broadcasting.

(Storage location of input delay time information)
Next, the location in the broadcast signal where the input delay time information according to the present invention is to be stored will be described.

  FIG. 8 shows a place for storing the input delay time information according to the present invention in the case of analog broadcasting. In analog television, as shown in FIG. 8, for example, the input delay time information may be included in the page data header in the page management information in the text broadcasting technical standard and transmitted. Since the bytes of DB15 (page presentation device) in the page data header (PACI page management information) are currently undefined except for b1 and b2, 6 bits of input delay time data are stored in the 6 bits.

  FIG. 9 shows a location for storing the input delay time information according to the present invention in the case of digital broadcasting. In the case of digital broadcasting, for example, as shown in FIG. 9, the input delay time is changed to 6-bit Reserved after TMD in caption text data (caption data) transmitted by caption PES in the ARIB technical standard and input here. 6 bits of delay time information (tentative name “Caption_data_setup_delay”) is stored and transmitted by bslbf (bit serial lower bit first).

  The above is only an example of the storage location of the input delay time information, and the present invention is realized regardless of the location as long as the input delay time information can be stored and broadcasted in any location of the TV signal. Is possible.

(Subtitle delay control device)
Next, the configuration of a caption delay control apparatus to which the caption delay compensation method of the present invention is applied will be described. The following caption delay control device can be configured as a control program that operates on a computer.

  In the caption delay control device, the video signal and the audio signal are given a fixed delay time (Dfix) that allows for the maximum caption delay in advance. In contrast, a subtitle signal is given a variable delay (Dvar) in units of pages. The variable delay time for the subtitle signal is calculated by the above equation (1). The input delay time ΔT is a delay time associated with subtitle input for each subtitle page. By this method, it is possible to prevent the discontinuity of video and audio due to the difference in caption delay time for each caption page.

  First, an embodiment in the case of analog subtitle broadcasting will be described. FIG. 10 is a block diagram showing a configuration of a caption delay control device in the case of analog caption broadcasting. In FIG. 10, the caption data extraction unit 61 extracts caption data from the caption-added video signal Svc and supplies it to the caption variable delay unit 65 and the input delay time output unit 66, and fixes the video signal after the caption data extraction to a video. This is supplied to the delay unit 62. The video fixed delay unit 62 delays the video signal by a predetermined fixed delay time Dfix and supplies it to the screen composition unit 63.

  On the other hand, the input delay time extraction unit 66 extracts the input delay time ΔT included therein from the caption data for each caption page and supplies it to the caption variable delay unit 65. In the above example, the input delay time extraction unit 66 acquires the input delay time ΔT from the 6 bits b3 to b6 of the DB 15 of the page data header (page management information) shown in FIG.

  The subtitle variable delay unit 65 calculates the variable delay time Dvar for each subtitle page based on the formula (1), delays the subtitle data by the variable delay time Dvar, and outputs it to the subtitle screen generation unit 64. The subtitle screen generation unit 64 generates a subtitle screen from the delayed subtitle data and supplies it to the screen synthesis unit 63.

  The screen synthesizing unit 63 synthesizes the video signal delayed by the fixed delay time Dfix and the subtitle screen delayed by the variable delay time Dvar and outputs them to the display circuit. Note that the audio signal is delayed by a fixed delay time Dfix similar to the video signal by the audio variable delay unit 67 and output to the audio circuit in order to maintain synchronization with the video signal.

  For example, when a subtitle delay control apparatus in which the fixed delay time Dfix is set to 15 seconds and a raw subtitle page delayed by an input delay time ΔT = 7 seconds is received, the variable delay time Dvar = 15−7 = 8 (seconds) is set. The Accordingly, the video signal and the audio signal are reproduced with a delay of 15 seconds, whereas the subtitles are reproduced with a delay of 8 seconds. As a result, the input delay time ΔT is compensated, and the video signal, the audio signal, and the subtitle are reproduced at the same timing on the time axis. Therefore, according to this method, the continuity between video and audio is maintained while the program is in progress, and the delay of the caption page is not recognized. However, in order to ensure the continuity between video and audio, it is necessary to set the fixed delay time Dfix to be larger than the maximum value of the input delay time ΔT in the captioned video signal transmitted from the broadcast station.

  As a method of delaying subtitle data by the subtitle variable delay unit 65, for example, a method of waiting for input delay time ΔT to start decoding subtitle data, or a method of waiting for input delay time ΔT to superimpose the decoded subtitle on the screen ,and so on.

  The subtitle delay control apparatus 60 shown in FIG. 10 can also reproduce a package subtitle program without subtitle delay in addition to compensating for subtitle delay in live subtitle broadcasting as described above. In this case, since the input delay time ΔT = 0, the variable delay time Dvar = fixed delay time Dfix in all the caption pages. That is, the subtitle delay control device 60 uses the video fixed delay unit 62, the subtitle variable delay unit 65, and the audio fixed delay unit 67 as described above when the currently received subtitle broadcast program is a live subtitle broadcast program. The delay is enabled (hereinafter, this state is referred to as “delay mode”). On the other hand, when the currently received subtitle broadcast program is a package subtitle broadcast program, the delays by the video fixed delay unit 62, the subtitle variable delay unit 65, and the audio fixed delay unit 67 are set to zero (hereinafter, this state is referred to as “non-display”). Called "delay mode".)

  However, when switching between the delay mode and the non-delay mode, care should be taken that discontinuity of video and audio occurs as described above. As a countermeasure, the viewer can select whether to switch to the delay mode at the entrance of the live subtitle program (“automatic delay mode”) or to watch all programs in the delay mode (“always delay mode”). What is necessary is just to comprise the caption delay control apparatus 60 so that it can select. As a preferable example, “always delay mode”, “automatic delay mode”, and “no delay compensation” are provided as modes that can be arbitrarily selected by the viewer, and the user may arbitrarily set them. In the “always-delayed mode”, all programs including subtitled programs are viewed with a certain delay. In this case, since only the subtitle timing is operated, no discontinuity of video / audio occurs. In the “automatic delay mode”, normal subtitle-free programs and packaged subtitle programs are viewed without delay, and switching is performed automatically allowing discontinuity of video and audio when entering and exiting live subtitle programs. In this case, an appropriate method is to switch to “ON” when the receiver selects the program number of the teletext subtitle, and to “OUT” when another program number is selected from the subtitle program numbers. In “no delay compensation”, all of these operations are stopped and the conventional reception mode is adopted. That is, subtitles are played back with a delay from the video.

  Note that, when controlling “entering” the delay mode, there is no video and audio over the fixed delay time Dfix period, so in order to eliminate the viewer's anxiety, for example “ It is desirable to make a notification such as “Activation of matching”. Similarly, since a video and audio skip occurs at the moment of “departing” from the delay mode, it is desirable to make a notice such as “Finished subtitle adjustment”.

  Next, an embodiment in the case of digital subtitle broadcasting will be described. FIG. 11 is a block diagram illustrating a configuration of a caption delay control apparatus in the case of digital caption broadcasting. The method of subtitle delay control is basically the same as that of the analog subtitle broadcast described above.

  A digital subtitle broadcast TS includes a video signal, an audio signal, and a subtitle PES, and is supplied to the TS fixed delay unit 101 and the subtitle PES extraction unit 103. The TS fixed delay unit 101 gives a fixed delay Dfix and supplies the delayed TS data Dtsd to the video / audio decoding unit 102. The video / audio decoding unit 102 decodes the video data and the audio data, supplies the fixed-delayed audio data Dad to the audio circuit, and supplies the fixed-delayed video data Dvd to the screen synthesis unit 106.

  On the other hand, the caption PES extraction unit 103 extracts the caption PES from the TS and supplies it to the caption data extraction unit 107. The subtitle data extraction unit 107 extracts subtitle data Dc from the subtitle PES and supplies the subtitle data Dc to the subtitle variable delay unit 104 and the input delay time extraction unit 108. The input delay time extraction unit 108 extracts the input delay time ΔT from the caption data Dc and supplies it to the caption variable delay unit 104. In the above example, the input delay time extraction unit 108 acquires the input delay time ΔT from 6 bits following TMD in caption text data (caption data) transmitted by caption PES in the ARIB technical standard.

  The subtitle variable delay unit 104 calculates the variable delay time Dvar based on the input delay time ΔT supplied from the input delay time extraction unit 108, delays the subtitle data by the variable delay time, and subtitles as subtitle data Dcd. This is supplied to the screen generation unit 105. The subtitle screen generation unit 105 generates subtitle screen data Dcc from the subtitle data Dcd and supplies it to the screen composition unit 106. The screen synthesis unit 106 synthesizes the video data Dvd delayed by the fixed delay time Dfix and the subtitle screen delayed by the variable delay time Dvar, and supplies them to the display circuit. In this way, audio, video, and subtitles are reproduced in a state where they coincide on the time axis.

  Note that the TS fixed delay unit 101 and the subtitle variable delay unit 104 can be realized by, for example, using a semiconductor memory as a paper, and forming a first in first out (FIFO) buffer and a ring buffer, respectively. Also, it is possible to realize variable delay of subtitles by appropriately setting PTS (Presentation Time Stamp) of the PES header extension part of video, audio and subtitles.

The example of the environment to which the caption delay control device concerning the present invention is applied is shown. It is a figure explaining the delay of a caption. It is a timing chart which shows the example of an ideal caption broadcast. It is a timing chart which shows the example of an actual caption broadcast. It is a timing chart which shows the example of the caption broadcast by this invention. The data structure example of input delay time information is shown. A method for transmitting a video / audio signal with subtitles including input delay time information by a broadcasting station is schematically shown. An example of storing input delay time information in analog subtitle broadcasting will be shown. An example of storage of input delay time information in digital subtitle broadcasting is shown. The structure of the caption delay control apparatus in the case of analog caption broadcasting is shown. The structure of the caption delay control apparatus in the case of digital caption broadcasting is shown.

Explanation of symbols

10 Broadcasting station,
20 Subtitle broadcast transmission system,
40 broadcast wave,
50 user environment,
52 TV receiver,
60, 100 Subtitle delay control device

Claims (6)

A receiving unit for receiving a video signal with subtitles;
An extraction unit for extracting a caption signal from the captioned video signal;
A video delay unit that delays the video signal by a predetermined fixed delay time to generate a delayed video signal;
A caption delay unit that delays the caption signal by a variable delay time according to the caption signal, and generates a delayed caption signal;
A synthesizing unit that synthesizes the delayed video signal and the delayed subtitle signal to generate a subtitle synchronized video signal in which the video and the subtitle are synchronized;
The video signal with subtitles includes subtitle character information in units of subtitle pages, and input delay time information for each subtitle page required from the start of subtitle character input to the transmission of the subtitle data,
The caption control unit for subtitled video signals, wherein the caption delay unit calculates the variable delay time by subtracting the input delay time from the fixed delay time for each caption page.   The delay of a video signal with subtitles according to claim 1, wherein the input delay time information is transmitted by being included in a page data header in page management information stipulated in a text broadcasting technical standard in analog television. Control device.   The apparatus according to claim 1, wherein the input delay time information is transmitted by being included in a caption data stream defined in ARIB technical standards in digital television.   2. The delay control device for a captioned video signal according to claim 1, wherein the fixed delay time is set to be larger than a maximum caption delay time of the caption signal included in the captioned video signal. A delay control device for subtitled video signals according to any one of claims 1 to 4,
An audio delay unit that receives an audio signal and delays the fixed delay time to generate a delayed audio signal;
A video / audio reproduction device with subtitles, comprising: a reproduction unit that reproduces the subtitle synchronized video signal and the delayed audio signal. By being executed by a computer terminal,
A receiver for receiving a video signal with subtitles;
An extraction unit for extracting a caption signal from the captioned video signal;
A video delay unit that delays the video signal by a predetermined fixed delay time to generate a delayed video signal;
A subtitle delay unit that delays the subtitle signal by a variable delay time corresponding to the subtitle signal, and generates a delayed subtitle signal; and
Combining the delayed video signal and the delayed caption signal to generate a caption synchronized video signal in which the video and the caption are synchronized, and causing the computer terminal to function as
The video signal with subtitles includes subtitle character information in units of subtitle pages, and input delay time information for each subtitle page required from the start of subtitle character input to the transmission of the subtitle data,
The subtitle delay unit calculates the variable delay time by subtracting the input delay time from the fixed delay time for each subtitle page.

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