JP3114260B2 - Subtitle super display control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subtitle super-display control circuit which allows a user to arbitrarily select display of subtitle information superimposed on video information, and more particularly to a reproduction output from a VTR as an input source. It relates to display control of subtitle super information when is supplied.

[0002]

2. Description of the Related Art In the United States and the like, a subtitle super broadcast synchronized with a television program is performed as part of a service for deaf people. This is known as a caption system. This caption system is configured so that a user can arbitrarily select display of subtitle super information superimposed on video information.

When the subtitle super display mode is selected, the following two examples can be considered as the input source.

[0004] First, there is a case where a normal television broadcast is watched in real time.

[0005] The second is a case where subtitle data is recorded and inserted into a tape on which a television broadcast is recorded or a recorded soft tape, and a reproduction output of the tape is used as an input source. It is.

[0006]

In the case of the first example,
Since the data of the superimposed subtitles is transmitted in real time one after another, the data for the superimposed subtitles is always displayed while being refreshed, and there is no particular problem in the superimposed subtitle display.

On the other hand, also in the case of the second example, the VTR
Is not a problem when the normal reproduction mode is used and the reproduction output is used as an input source. But V
Select a special playback mode such as pause mode for the TR,
When the reproduced output at that time is used as an input source, the following problem occurs.

[0008] The data for superimposed subtitles is once per frame as data for superimposed subtitle display on a predetermined horizontal line, for example, the 21st horizontal line in the vertical blanking period.
Six bits of data are inserted.

On the other hand, in the case of the pause mode, the VT is set so that noise is not projected on the reproduction screen.
When noise is superimposed inside R, processing may be performed to drive the noise within the vertical blanking period. When the displaced noise corresponds to a horizontal section in which the data for superimposed subtitle display is inserted, the data for superimposed subtitle display is erased.

In such a case, the decoder for superimposed subtitle display data provided in the superimposed subtitle display control circuit cannot correctly detect the data, so that the superimposed subtitle display control circuit does not display superimposed subtitles. In many cases, the subtitle super display mode is automatically controlled to the off mode.

Therefore, when a playback output such as a VTR is used as an input source and a playback output in the special playback mode is supplied, a subtitle superimposed cannot be displayed. If this subtitle super function is used for language practice, the characters cannot be displayed, and the device will not function as a language practice device.

Therefore, the present invention solves such a conventional problem. Even when a special reproduction output from a VTR arrives as an input source, it is possible to correctly display a subtitle superimposed on the video information. The present invention proposes a subtitle super display control circuit as described above.

[0013]

In order to solve the above-mentioned problems, the present invention provides a method for vertical blanking of video information.
In a subtitle super display control circuit capable of selectively displaying subtitle super information inserted during a period, a memory means for storing the subtitle super information for each transmission unit, and the subtitle super information stored in the memory means as video information. And a control means for controlling the memory means and the imposition means based on the reproduction mode of the video information, and this control means, at least when the video information is reproduced in the special reproduction mode, Memory control so that the subtitle super information stored in the memory means is retained until the special playback mode is released, and imposition control so as to repeatedly insert the subtitle super information into the video information. It is.

[0014]

In the normal reproduction mode, in FIG. 1, the subtitle super display data inserted during the vertical blanking period of the video information is stored in the RAM 21 functioning as a memory means for each transmission unit (for the text). At each break), that is, each time the next new subtitle super display data is input, that data is accumulated. If the input source is on-air television broadcasting or VTR
When the playback output is a playback output in the normal playback mode, the subtitle super-display data is refreshed for each transmission unit and supplied by the microcomputer 20 to the imposition means comprising the imposition control circuit 27 and the synthesizer 13. And synthesized with video information (video signal).
The composite output is supplied to the display device 40 (see FIG. 2), and is displayed.

At the time of special reproduction When a reproduction output from a VTR or the like is selected as an input source, and when a reproduction output in a special reproduction mode such as a pause is supplied, a period until the special reproduction mode is canceled is provided. By the microcomputer 20 as control means.
The memory of the information of the AM 21 is controlled so as to retain the latest caption super display data stored immediately before without being refreshed. The stored subtitle super-display data is supplied by the microcomputer 20 to the imposing means including the imposition control circuit 27 and the synthesizer 13 so as to be repeatedly used, and synthesized into video information (video signal). Therefore, even when the playback output in the special playback mode is used as an input source, superimposed subtitle display is possible without performing off-mode control as in the conventional method.

[0016]

Next, an example of a subtitle super display control circuit according to the present invention will be described in detail with reference to the drawings. The example shown in FIG. 1 is a case where this subtitle super display control circuit is built in a VTR.

A subtitle super display control circuit 10 shown in FIG.
In the terminal 11, a video signal reproduced by the VTR 30 (see FIG. 2) is supplied to the terminal 11, and the data for superimposing subtitles is supplied to a predetermined horizontal line in a vertical blanking period, for example, the 21st horizontal line, in one frame. 2 bytes of data (16-bit ASCII code) once per time
Is inserted. A case is shown in which the terminal 11 can be selectively supplied with an on-air television broadcast.

The video signal supplied to the terminal 11 is supplied to the synthesizer 13 after its pedestal level is clamped by the clamp circuit 12. The synthesized signal (video signal and superimposed subtitle display signal) obtained at the output terminal 14 of the synthesizer 13 is supplied to a display device 40 (see FIG. 2) such as a television receiver, and the superimposed subtitle is superimposed on the video information. Is done.

Therefore, the clamped video signal is also supplied to the data slicer 16 to extract (slice) subtitle super display data inserted into a predetermined horizontal line. The extracted subtitle super display data is demodulated by the decoder 17 and then stored in the RAM 21 functioning as a memory means via the microcomputer 20. RAM 21
The unit of the subtitle super display data stored in the RAM 21 is such that a set of subtitle superimposed in units of a predetermined frame is inserted into the RAM 21 as a unit of a predetermined frame, for example, at each break of a sentence. Is stored.

[0020] The subtitle super display data is decoded data itself, which is data representing characters or symbols,
Alternatively, the data may be character font data representing characters or symbols. In this example, a character memory (ROM or the like) 25 is provided in connection with the microcomputer 20, and the data in the ROM 25 is referred to as necessary. It can also be used for subtitles.

The display signal (character data) for subtitle superimposition outputted via the microcomputer 20 is supplied to the imposition control circuit 27. The above-described subtitle super-display signal is output to the impose control circuit 27 at a predetermined timing while synchronizing with the horizontal and vertical synchronizing signals generated in the timing generator 23 described later. Is synthesized. Therefore, the synthesized signal obtained at the output terminal 14 is
The subtitle superimposed at a predetermined position together with the video information by being supplied to 0.

In order to perform such processing, the video signal after clamping is separated into vertical and horizontal synchronizing signals in a synchronizing separation circuit 22, and these synchronizing signals are supplied to a timing generator 23 so that data for subtitle super display is displayed. Is generated. In addition, the horizontal and vertical synchronization signals are shaped, and the shaped synchronization signals are supplied to the impose control circuit 27.

The clock signal output from the clock generator 24 is supplied to the decoder 17 to decode the subtitle super-display data, and the microcomputer 20
Then, the writing and reading of the data for the subtitle super display are performed based on this clock signal.

A subtitle display on / off signal for instructing on / off of the subtitle super display is sent to the microcomputer 20 at a terminal 29.
Is supplied via Therefore, only when a signal instructing display ON is supplied, the superimposed subtitle is superimposed on the above-described video information.

The microcomputer 20 further receives a VT signal from a terminal 28.
A mode signal indicating the operation mode of R30 is supplied. The contents of the mode signal control the state of writing and reading of the subtitle super display data to and from the RAM 21.

First, when the VTR 30 is in a normal reproduction mode (the same applies to a television broadcast in which the input source is on-air), the contents of the RAM 21 are refreshed for each transmission unit, and the subtitle super display signal read out in real time. Is sent from the imposition control circuit 27 and is synthesized with the video signal. Therefore, the subtitle superimposed on the video information is superimposed on the display device 40 in real time.

The position and size of the subtitle superimposed to be superimposed can be set to a predetermined position and size, or can be arbitrarily set by the user. In this case, the control signal is supplied to the microcomputer 20 from the outside, and an instruction signal therefor is supplied to the imposition control circuit 27 via the microcomputer 20.

When the VTR 30 is driven in a special playback mode such as a pause mode and the playback output at that time is supplied to the terminal 11, the information in the RAM 21 is refreshed until the special playback mode is released. The writing and reading operations to and from the RAM 21 are controlled so that the latest subtitle super display data held in the RAM 21 is repeatedly used without being used.

As a result, the subtitle superimposed on the basis of the subtitle super display signal supplied via the imposition control circuit 27 is superimposed on the video information. As a result, in the special reproduction mode, the subtitle super display data obtained at that time is not used, so that even when the reproduction output in the special reproduction mode is used as an input source, the superimposition of the subtitle superimposition becomes possible.

When the mode shifts from the special reproduction mode to the normal reproduction mode, the RAM 21 returns to the normal writing and reading operations. If, for example, a subtitle holding signal is supplied instead of the mode signal even during normal reproduction, it is possible to display only subtitles for a predetermined period of time while any video information is being displayed.

When the subtitle super display control circuit 10 according to the present invention is incorporated in the VTR 30 as shown in FIG. 3, the mode signal is generated separately from a video signal which is a reproduction output. Although an example in which this is supplied to the terminal 28 is shown in FIG. 1, it is also possible to transmit this mode signal by superimposing this mode signal during the vertical blanking period of the video signal.

FIG. 2 shows that when the VTR 30 is controlled by the remote controller 33, the microcomputer 20 can be controlled in synchronization with the remote control signal in the special reproduction mode selected by the remote controller 33. To do so, as shown in the figure,
Light receiving sections 31 and 32 for remote control signals are provided in each of the subtitle display control circuit 30 and the subtitle super display control circuit 10, and the VTR 30 is controlled to a special reproduction mode based on the remote control signals received by the light receiving section 32. At the same time, the microcomputer 20 may be configured to recognize that the input source has been changed to the special reproduction output based on the remote control signal received by the light receiving unit 31.

FIG. 4 et seq. Show another combination example of the present invention. FIG. 3 shows an example of the combination of FIG. 1, and FIG. 4 shows a case where the VTR 30 and the display device 40 including the subtitle super display control circuit 10 are configured separately.

FIG. 5 shows an example in which the subtitle super display control circuit 10 is built in the display device 40, and FIG. 6 shows an example in which three persons are integrated. The configuration shown in FIG. 2 can be applied to the examples shown in FIGS.

As the above-mentioned subtitle supermarkets, in addition to the subtitle supermarkets for deaf-mute people, subtitle supermarkets for language practice,
Others such as performing caption supermarkets for special purposes may be used. As an input source, a video disk or the like can be considered in addition to the VTR.

[0036]

As described above , according to the present invention , the video
Subtitles inserted during the vertical blanking period of information
Par information Te selectively displayable subtitle display control circuit odor, control means for controlling on the basis of the memory means and imposing unit to the reproduction mode of the video information provided, at least video information is reproduced in the special reproduction mode when,
The memory is controlled so that the subtitle super information stored in the memory means is retained until the special reproduction mode is released, and the imposition control is performed so that the subtitle super information is repeatedly inserted into the video information.

According to this, since the subtitle super display data obtained at that time is not used in the special reproduction mode, the subtitle can be superimposed even when the reproduction output in the special reproduction mode is used as an input source. become.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an example of a subtitle super display control circuit according to the present invention.

FIG. 2 is a system diagram showing an example of use in a special reproduction mode.

FIG. 3 is a configuration diagram showing an example of a display system utilizing the present invention.

FIG. 4 is a configuration diagram showing an example of a display system utilizing the present invention.

FIG. 5 is a configuration diagram showing an example of a display system utilizing the present invention.

FIG. 6 is a configuration diagram showing an example of a display system utilizing the present invention.

[Explanation of symbols]

 Reference Signs List 10 Subtitle super display control circuit 11 Reproduction output input terminal 16 Slicer for subtitle super display data 17 Decoder 20 Microcomputer 21 RAM as memory means 25 ROM for character characters 27 Impose control circuit

Claims (2)

(57) [Claims] 1. Insertion during the vertical blanking period of video information
In selectively displayable subtitle display control circuit subtitle information that is, a memory means for storing for each sending unit of the subtitle information, the subtitle information stored in said memory means to said video information An imposing means for inserting; and a control means for controlling the memory means and the imposing means based on a reproduction mode of the video information, wherein the control means reproduces at least the video information in a special reproduction mode. At this time, the memory control is performed so that the subtitle super information stored in the memory means is retained until the special playback mode is released, and the imposition control is performed so that the subtitle super information is repeatedly inserted into the video information. A superimposed subtitle display control circuit. 2. The subtitle super display control circuit according to claim 1, wherein the special reproduction mode is an operation for temporarily stopping reproduction of the video information.