KR20000037012A - Caption control apparatus and method for video equipment - Google Patents

Abstract

PURPOSE: An apparatus for controlling caption of imaging device and a method thereof are provided to turn off the volume of an image screen during a caption specific mode and to display only the caption on the screen. CONSTITUTION: An apparatus for controlling caption of imaging device includes a key input(10), a switch(8), and a controller(30). The key input(10) receives a caption control signal. The switch(8) receives an image signal, a caption signal, and a mute signal. The switch selects one signal from the image signal, the superposition signal of the image signal and the caption signal and the superposition signal of the mute signal and the caption signal. The controller(30) outputs a switching control signal according to the caption data included in the image signal and the key input.

Description

Caption control apparatus and method for controlling video apparatus

The present invention relates to a caption control apparatus for a video device and a control method thereof. In particular, the caption (character) is displayed on a video display device by decoding a caption signal during the vertical blanking period of the video signal. The present invention relates to a caption control apparatus and a control method of a video device capable of maximizing a reading effect of a caption by placing a caption (character) at a specified position on the screen.

In general, a caption is composed of letters and symbols and is superimposed on a video screen. The caption video device is a device that decodes the caption data contained in the 21st line of the odd field of the video signal and displays it at a specific position (upper or lower position) of the video screen. Is being applied. The caption stop function (PAUSE or FREEZE) is a function to control the display of such captions. When the caption stop function is selected, the captions are displayed continuously until a separate caption stop function is released. Conventional caption control technology includes the BRIGHT function to adjust the brightness of the caption, the POSITION function to adjust the position where the caption is displayed on the screen, and the FILTER function to select the opaque, translucent, or transparent background part of the caption. This caption control function is operated by key input unit or remote controller.

For example, in the case of distributing a video tape produced in a foreign country, the user may dub a dialogue in a native language in order to help the viewers of the country to understand. This is the case where an English video tape is displayed in a Korean subtitle.

The video tape dubbed directly in the native language as described above cannot be arbitrarily selected by the viewer to display the dubbed caption. This is called an open caption. On the other hand, the caption data is encoded in the 21st line of the radix field of the video signal and decoded so that the caption data can be superimposed on the top or bottom of the screen depending on whether the caption is on or off. This is called a closed caption. do. The closed caption device is widely used for foreign language learning, but there is a problem in that the readability is lowered due to the image and thus the learning effect is reduced. In addition, since there was no function for converting the caption attribute, it was difficult for the user to decrypt the caption.

Therefore, the technical problem to be achieved by the present invention is installed inside the video device to overcome the problems of the prior art, the caption read mode by controlling the video screen to be muted in the caption-only mode to display only the caption of the video signal on the screen It is an object of the present invention to provide an apparatus for capturing video captions and a method of controlling the same to double the effect.

Another technical problem to be achieved by the present invention is to be installed outside the video device to overcome the problems of the prior art to receive a video signal, a mute video signal and a caption signal from the video device, so that the video screen is muted in the caption-only mode Accordingly, an object of the present invention is to provide a caption control apparatus and a control method of a video device that doubles the caption reading effect by controlling only the caption of the video signal to be displayed on the screen.

Another technical problem to be achieved by the present invention is installed outside the video device to overcome the problems of the prior art to receive a video signal from the video device, generating a mute video signal and a caption signal, the image in the caption-only mode It is an object of the present invention to provide a caption control apparatus and a control method of a video device which doubles the caption reading effect by controlling the screen to be muted so that only the caption of the video signal is displayed on the screen.

Another technical problem to be achieved by the present invention is installed between a first video device having an image display function and a second video device having an image receiving function to receive an image signal through a second video device, It is another object of the present invention to provide an apparatus for capturing a caption of a video apparatus and a method of controlling the same, which double the caption reading effect by controlling only the caption to be output to the first video apparatus.

1 is a block diagram illustrating an apparatus for controlling caption of a video apparatus according to an embodiment of the present invention.

2 is a waveform diagram illustrating a caption standard of a video signal.

3 is a diagram for describing caption data of line 21 of a video signal.

4A to 4C are exemplary diagrams for describing an operation of an apparatus for capturing video apparatus according to the present invention.

FIG. 5 is a diagram illustrating an imaging system to which an apparatus for capturing video apparatus according to the present invention is applied.

6 is a view for explaining the appearance of the video device caption control apparatus according to the present invention.

According to an aspect of the present invention, there is provided a caption control apparatus for a video device, the apparatus including: a key input unit for inputting a caption control command; A video signal, a caption signal, and a mute video signal are input and switched according to a switching control signal, and one of the superimposition signal of the video signal, the video signal and the caption signal, and the superimposition signal of the mute video signal and the caption signal is selected. An output switch unit; And a control unit which outputs a switching control signal to the switch unit according to the key input of the key input unit and the caption data included in the image signal.

Preferably, the video device caption control apparatus of the present invention includes a caption data extraction unit for separating and extracting caption data from the video signal; A mute image signal generator for providing a mute image signal; And a caption signal generator for outputting a caption signal included in the video signal based on the caption control signal, wherein the controller analyzes the caption data to decode the control code and character code of the caption data to display the caption. The position, display form (attribute), etc. to be decoded are decoded and the decoded result is supplied to the caption signal generator as a caption control signal.

Preferably, the caption control apparatus of the video device of the present invention supplies horizontal and vertical synchronization signals separated from the video signal to the caption data extracting unit and the caption signal generator when installed inside or outside the video device. The video signal output from the video device caption control device is input to the video input terminal of the video device.

Preferably, the caption control apparatus of the present invention further includes a synchronization signal separation unit for separating vertical and horizontal synchronization signals from the video signal input from the video output terminal of the video device when installed inside or outside the video device. The separated horizontal and vertical synchronizing signals are supplied to the caption data extracting unit and the caption signal generator, and the video signals output from the caption control apparatus of the video device are input to the video input terminal of the video device.

Preferably, the video device caption control apparatus of the present invention is installed between the first video device having a video display function and the second video device having a video receiving function, and the video signal output from the video output terminal of the second video device. Is input to an image input terminal of the caption control device, and supplies horizontal and vertical synchronization signals separated from the video signal to the caption data extracting unit and the caption signal generator in the video device, and from the video device caption control device. The output video signal is input to the video input terminal of the first video device.

Preferably, the video device caption control apparatus of the present invention is installed between the first video device having a video display function and the second video device having a video receiving function, and the video signal output from the video output terminal of the second video device. Is input to an image input terminal of the caption control apparatus, and in this case, further comprising a synchronization signal separation unit for separating vertical and horizontal synchronization signals from the input image signal, and extracting the caption data from the separated horizontal and vertical synchronization signals. And an image signal supplied to the caption signal generator and output from the caption control device to an image input terminal of the first image device.

Preferably, the caption data extracting unit extracts caption data on a predetermined line of the horizontal synchronization signal of the video signal.

More preferably, the caption data is data existing in the 21st line of the horizontal synchronization signal.

Preferably, the key input unit includes a caption on-off key and a caption-only mode key for designating a caption mode on-off and a caption-only mode, and the switch unit switches according to a switching control signal to provide a key input of the key input unit. Outputs a video signal when the caption mode is turned off, and outputs an overlapping signal between the video signal and the caption signal when the caption mode is turned on; and in the caption-only mode by key input of the key input unit, the mute video signal and the caption signal. It is characterized in that for outputting the overlap signal with.

More preferably, the key input unit is a PAUSE or FREEZE key having a caption stop function, a BRIGHT key having a brightness adjustment function of a caption, a POSITION key having a caption position adjustment function, and an opacity, translucent or transparent control of a background portion where a caption is displayed. One or a combination of the FILTER key having a function, a key for changing the color of the background screen, a key for adjusting the number of displayed caption lines, and a key for muting the voice.

Preferably, the video device is any one of an analog TV, a digital TV, a satellite TV, a VCR, a monitor, a personal computer with a TV receiving card, and a set-top box (STB) employing any one of NTSC, PAL, and SECAM. It features.

According to another aspect of the present invention, there is provided a video caption control method for a video caption control apparatus, comprising: inputting a caption control command; A video signal, a caption signal, and a mute video signal are input and switched according to a switching control signal, and one of the superimposition signal of the video signal, the video signal and the caption signal, and the superimposition signal of the mute video signal and the caption signal is selected. A switching step of outputting; And outputting the switching control signal according to the caption data included in the key input and the image signal.

Preferably, the caption control method of a video device of the present invention comprises the steps of: extracting caption data from the video signal; Generating a mute image signal for providing a mute image signal; And outputting a caption signal included in the video signal based on the caption control signal. And analyzing the caption data to decode the control code and character code of the caption data to decode the position, display form (attribute), etc., where the caption is to be displayed, and output the decoding result as a caption control signal. It is done.

Preferably, the caption control method according to the present invention includes extracting the caption data from horizontal and vertical synchronization signals separated from the video signal in the video device when the video device caption control device is installed inside or outside the video device. It is supplied to the caption signal generation step, characterized in that the output video signal is input to the video input terminal of the video device.

Preferably, the caption control method of the present invention is a synchronization signal for separating the vertical and horizontal synchronous signal from the video signal input from the video output terminal of the video device when the video device caption control device is installed inside or outside the video device The method further includes a separating step, wherein the separated horizontal and vertical synchronization signals are supplied to the caption data extracting step and the caption signal generating step, and the video signal output from the caption control device of the video device is sent to the video input terminal of the video device. Characterized in that the input.

Preferably, the caption control method of a video device of the present invention is provided when the caption control device of the video device is installed between a first video device having an image display function and a second video device having an image reception function. The video signal output from the video output terminal is input to the video input terminal of the video device caption control apparatus, and the horizontal and vertical synchronization signals separated from the video signal in the video device are used in the caption data extraction step and the caption signal generating step. And supply a video signal output from the video device caption control device to a video input terminal of the first video device.

Preferably, the caption control method of a video device of the present invention is provided when the caption control device of the video device is installed between a first video device having an image display function and a second video device having an image reception function. The video signal output from the video output terminal is input to the video input terminal of the caption control device, and in this case, further comprising a synchronization signal separation step for separating vertical and horizontal synchronization signals from the input video signal. And supplying a vertical synchronization signal to the caption data extraction step and the caption signal generation step, wherein the video signal output from the video device caption control device is input to the video input terminal of the first video device.

Preferably, the caption data extraction step extracts caption data on a predetermined line of the horizontal synchronization signal of the video signal.

More preferably, the caption data is data existing in the 21st line of the horizontal synchronization signal.

Preferably, the key input step includes a caption mode on-off and a caption-only mode designation, and the switching step switches according to a switching control signal, and when the caption mode is turned off by the key input of the key input step. And outputs a video signal, and when the caption mode is on, outputs an overlapping signal between the video signal and the caption signal, and outputs an overlapping signal between the mute video signal and the caption signal in the caption-only mode.

More preferably, the key input step includes inputting a PAUSE or FREEZE function having a caption stop function, performing a BRIGHT function having a brightness control function of a caption, performing a POSITION function having a caption position adjustment function, One of the steps of performing the FILTER function having the opacity, translucency, or transparency of the background portion where the caption is displayed, switching the color of the background, adjusting the number of displayed caption lines, and muting the voice Or a combination thereof.

Hereinafter, a caption control apparatus and a method of controlling the apparatus of the present invention will be described in detail with reference to the accompanying drawings. Here, as a preferred embodiment of the present invention, a television caption control apparatus employing the NTSC method and a control method thereof will be described.

The circuit configuration diagram of the television caption control apparatus 100 of the present invention is as shown in FIG. In Fig. 1, the sync signal separator 4 separates the vertical and horizontal sync signals from the video signal and supplies these separated horizontal and vertical sync signals to the caption data extractor 5 and the caption signal generator 7. The caption data extracting unit 5 counts the vertical and horizontal synchronizing signals provided from the synchronizing signal separating unit 4 to separate caption data in the 21st line of the horizontal synchronizing signal during the vertical retrace period. Is supplied to a control unit 3 made of a microprocessor. The caption signal generator 7 receives the horizontal and vertical synchronization signals and outputs a caption signal by the caption control signal transmitted from the control unit 3.

Meanwhile, the television caption control apparatus 100 of FIG. 1 includes a key input unit 10 for inputting a caption command of a user in order to designate a caption on / off and a language learning only mode, that is, a caption only mode. In addition, in FIG. 1, the mute image signal generator 9 generates a mute image signal so that the mute image signal is displayed on the screen when the foreign language learning-only mode (caption-only mode) is input by the user input of the key input unit 10. . Further, the control unit 3 analyzes the caption data provided by the caption data extraction unit 5 to decode the control code and character code of the caption data to decode the position, display form (attribute), etc., where the caption is to be displayed, and Characters to be actually displayed are decoded, and the decoded result is supplied to the caption signal generator 7 as a caption control signal and supplied to the switch unit 8 according to the input input through the key input unit 10 and the input caption data. Outputs a switching control signal to provide. Although not shown in FIG. 1, the controller 3 may include a microprocessor or a microcomputer for controlling the entire system.

On the other hand, the switch unit 8 of FIG. 1 switches according to the switching control signal of the control unit 3, and outputs a video signal in the normal caption off mode, and superimposes the video signal and the caption signal in the caption on mode. A signal is outputted, and an overlapping signal of the mute video signal and the caption signal is output in the caption-only mode by the input of the key input unit 10. Accordingly, when the caption-only mode is selected according to the needs of the user, the television caption control apparatus 100 of the present invention may increase the caption reading efficiency, that is, the foreign language learning efficiency, by outputting only the mute video signal and the caption on the screen.

2 is a waveform diagram illustrating a caption standard of the NTSC composite television signal. Normally, the caption data is contained in the 21st line of the radix field during the vertical blanking, that is, the vertical blanking period of the video signal, as shown in FIG. 2. The caption data extracting section 5 captures caption data from the video signal. Is separated.

3 is a diagram for explaining caption data of the 21st line of an NTSC television composite video signal. In FIG. 3, the caption data extraction unit 5 receives horizontal and vertical synchronization signals and counts the horizontal synchronization signal H-SYNC during the vertical retrace period, extracts caption data from the 21st, and provides the caption data to the controller 3. do. The control unit 3 decodes two-byte data information (caption data) and supplies it to the caption signal generator 7 (also called a programmable on-screen display (OSD)), whereby the caption signal generator 7 Outputs the corresponding caption signal (text signal). Then, the switch unit 8 finally outputs an image in which the caption signal output from the caption signal generator 7 is selectively combined with the original video signal and the mute video signal by the switching control signal of the controller 3. In the present invention, when the caption-only mode which is a foreign language learning-only mode is input by the input of the key input unit 10, the mute video signal and the caption signal provided by the mute video signal generator 9 are superimposed instead of the original video signal. By doing so, the caption reading function, that is, the foreign language learning effect can be maximized.

The preferred television caption control apparatus 100 of the present invention includes a function of outputting a caption only on a screen by inputting a video signal to which a caption is added, and can be installed inside and outside the television. When installed inside the television, it may operate independently of the video signal processor in the television itself or may operate independently of the video signal processor of the television. When the television caption control apparatus of the present invention operates independently of the television, it immediately receives the video signal received through the tuner of the television, generates caption data and synchronization signals as described above, and acquires the caption signal. A selective combination signal of a signal, an input video signal, and a mute video signal is output, and in case of a dependent operation, a video signal, a caption signal, and a mute video signal are received from a video processing unit of a television to output a selective combination signal. . Whether the video device caption control device of the present invention operates independently of the television or dependently, the necessary synchronization signal can be provided from the synchronization signal separation unit in the television itself.

In addition, the preferred television caption control apparatus 100 of the present invention is connected between the television 200 having an image display function and the VCR 300 having an image receiving function, as shown in FIG. The receiver may be configured to receive an image signal using a tuner of the VCR 300 without a receiver, that is, a tuner. In this case, the video signal from the broadcasting station is received by the video input terminal of the VCR 300, and the audio signal is transmitted to the TV 200 for processing, and the video signal is sent to the television caption control apparatus 100 of the present invention so that the caption is controlled. The video signal is transmitted to the video input terminal of the TV 200. Thus, the television caption control apparatus 100 of the present invention can perform caption control through the television screen.

The operation of the preferred television caption control apparatus of the present invention configured as described above will be described in detail below.

As shown in FIG. 2, the caption signal is included in the 21st line of the vertical blanking period of the radix field of the video signal. The caption data extractor 5 separates and decodes the caption data by counting the horizontal synchronization signal. The decoded data is transmitted to the controller 3, and the controller 3 outputs a caption control signal to the caption signal generator 7 according to the data and the input of the key input unit 10 and accordingly the caption signal. The generator 7 outputs the corresponding caption signal to the switch section 8. The control unit 3 outputs a switching control signal to the switch unit 8 so that the video signal is output as it is when the caption of the key input unit 10 is closed, and when the caption on the video signal and the caption signal are superimposed. Outputs a switching control signal to the switch 8, and in the caption-only mode, i.e., the foreign language learning-only mode, the mute image signal generated by the mute image signal generator 9 and the caption signal generator 7 A switching control signal is output to control the switch unit 8 so that the caption signal is superimposed.

4A to 4C are exemplary diagrams for explaining the operation of the television caption control apparatus according to the present invention.

FIG. 4A illustrates a screen in which a video signal and a caption signal are superimposed on a normal caption. FIG. 4B illustrates a screen in which a mute video signal and a caption signal overlap in a caption-only mode. The mute video signal may be a gray screen. The screen may be a blue screen in the form of a blue screen, but the present invention is not limited thereto, and a desktop of various colors such as green, red, and yellow may be produced. 4C is a diagram illustrating an example of a screen displaying a caption by modifying a property of a caption to a predetermined position and a size of a text in a caption-only mode. As shown in FIG. 4C, the television caption control apparatus of the present invention has attributes of captions displayed on the screen, that is, the position, size, shape (font), color, and total number of display lines of characters that can be displayed on the screen. Can be used to switch between caption display methods such as roll-up, pop-on, and paint-on. Although not shown in FIG. 6, a key for adjusting the number of lines of captions displayed may be provided, or a voice mute key may be provided. The caption control apparatus according to the present embodiment can be applied to a caption display method of roll-up, pop-on and paint-on.

A function of displaying and controlling captions in the caption-only mode of the present invention will be described with reference to FIG. 6. In FIG. 6, the caption control apparatus of the present invention operates by pressing the POWER key 61 to operate in caption-on mode, and presses the BOOK key 64 to operate in caption-only mode. When the caption-only mode is pressed by pressing the BOOK key 64, there is a caption stop key (PAUSE or FREEZE) 66. When the caption stop function is selected, the stopped captions are continuously released until the separate caption stop function is released. Can be displayed. This PAUSE function also works in caption-on mode. In addition, as a technology to control the caption in the caption-only mode, the BRIGHT key 62 for adjusting the brightness of the caption, the POSITION key 65 for adjusting the position of the caption on the screen, and the background portion where the caption is displayed are opaque. The FILTER key 63 can be used to select semitransparent or transparent. This caption control function is operated by a key input unit (10 in FIG. 1) or a remote controller.

Although the TV caption control apparatus according to the embodiment of the present invention described above processes only the video signal and does not process the audio signal, it is also possible to control audio signals other than the video signal. That is, the television caption control apparatus according to the present invention may have the audio signal processing unit inside or receive the audio signal from the audio processing unit of the television so that the audio signal may be controlled together with the caption signal by the switching control signal of the control unit. It will be apparent to those skilled in the art that the present invention will be described and will not be described in detail. However, when the television caption control apparatus of the present invention is applied to a television, since the audio signal is separated from the composite video signal and output through the speaker of the television, a television having a function of muting the audio signal using a remote controller is used. Only the caption can be displayed without a voice output through the television screen, and conversely, only the voice can be output without the caption output, thereby increasing the user's foreign language learning efficiency.

The operation of the switch unit 8 according to the switching control signal of the control unit 3 of FIG. 1 is shown in a table as follows.

Switching control signal input Print Caption Signal Video signal Mute Image Signal Voice signal a ○ ○ Caption + Video b ○ ○ Caption + Mute c ○ ○ Caption + Voice d ○ Caption e ○ voice

As shown in Table 1, when the switching control signal a, the overlapping signal of the caption and the video signal is output, when the switching control signal b, the overlapping signal of the caption and the mute video signal is output, the switching control signal c When the caption and the audio signal are output, when the switching control signal d, only the caption is output, and when the switching control signal e, only the audio signal can be controlled. A number of possible outputs can be combined in addition to those listed in Table 1, but only the outputs deemed necessary by the user are described. As shown in Table 1, the caption control apparatus of the present invention can be used in various ways. It can be designed to get the output.

The preferred television caption control apparatus of the present invention described above can be designed to have an appearance as shown in FIG. The television caption control apparatus shown in FIG. 6 may be installed between the TV 200 and the VCR 300 as shown in FIG. 5, and is activated when the power key 61 is pressed to apply power. You can control it. In FIG. 6, as the caption control key, as described above, only the caption described so far in the present invention is displayed on the screen so that the TV screen functions as a single book (BOOK) 64, in addition to the PAUSE having a caption stop function. Or FREEZE key 66, BRIGHT key 62 with caption brightness adjustment function, POSITION key 65 with caption position adjustment function, FILTER key with opacity, translucent or transparent adjustment of the background part where caption is displayed (63) is provided. Therefore, when the power is applied by pressing the POWER key 61 and pressing the BOOK key 64, the muted video signal and the caption signal are superimposed on the TV screen through the switch unit 8 of FIG. This allows the TV screen to be used as a book. Although not shown in FIG. 6, a scroll up / down key and a pop on / off key may be provided to move and control the position of the caption, and the paint on / off key to adjust the color of the caption or the number of lines of the caption displayed. It may be provided with a key to adjust, and may also be provided with a voice mute key.

The apparatus for capturing video apparatus of the present invention described above may be applied to a TV, a VCR, a monitor, a TV receiving personal computer, and a set top box (STB), and may be equally applicable to analog TV, digital TV, and satellite TV. In addition, it can be applied to all NTSC, PAL, and SECAM methods.

As described above, the apparatus for controlling a caption of a video device and a method of controlling the same may be applied to a received video signal or a videotape video signal of a TV broadcast, and in particular, by capturing a caption signal when a foreign language is learned. It is advantageous to overcome the problem that the learning effect is inferior. In the caption-only mode, the video screen is muted so that only the caption signal is displayed on the screen, thereby improving the readability of the caption.

Claims (22)

In the video device caption control device, A key input unit for inputting a caption control command; A video signal, a caption signal, and a mute video signal are input and switched according to a switching control signal, and one of the superimposition signal of the video signal, the video signal and the caption signal, and the superimposition signal of the mute video signal and the caption signal is selected. An output switch unit; And And a control unit for outputting a switching control signal to the switch unit according to the key input of the key input unit and the caption data included in the image signal. The apparatus of claim 1, further comprising: a caption data extractor for separating and extracting caption data from the video signal; A mute image signal generator for providing a mute image signal; And A caption signal generator for outputting a caption signal included in the video signal based on the caption control signal; The controller analyzes the caption data and decodes the control code and character code of the caption data to decode the position, display form (property), etc., where the caption is to be displayed, and supply the decoding result as the caption control signal to the caption signal generator. Caption control apparatus for video equipment. The apparatus of claim 2, wherein the horizontal and vertical synchronization signals separated from the video signal are supplied to the caption data extractor and the caption signal generator in the video device when installed inside or outside the video device. And a video signal output from the control device is input to the video input terminal of the video device. 3. The apparatus of claim 2, further comprising a synchronization signal separation unit for separating vertical and horizontal synchronization signals from the video signal input from the video output terminal of the video device when installed inside or outside the video device. And a vertical synchronizing signal is supplied to the caption data extracting unit and the caption signal generator, and the image signal output from the caption control apparatus is input to the image input terminal of the image apparatus. The apparatus of claim 2, wherein the video signal output from the video output terminal of the second video device is installed between the first video device having a video display function and the second video device having a video receiving function. A horizontal and vertical synchronization signal separated from the video signal in the video device to the caption data extractor and the caption signal generator, and the video signal output from the video device caption control device Caption control apparatus for a video device, characterized in that the input to the video input terminal of the first video device. The video signal output from the video output terminal of the second video device when the first video device having a video display function and the second video device having a video receiving function is installed. The caption data extracting unit and the caption signal generator further include a sync signal separator for separating vertical and horizontal sync signals from the input video signal. And a video signal output from the caption control device is input to a video input terminal of the first video device. 7. The apparatus of claim 1, wherein the caption data extracting unit extracts caption data on a predetermined line of a horizontal synchronization signal of the image signal. 8. The apparatus of claim 7, wherein the caption data is data existing in a 21st line of a horizontal synchronization signal. The apparatus of claim 1, wherein the key input unit includes a caption on / off key and a caption dedicated mode key for designating a caption mode on / off and a caption-only mode, and wherein the switch unit is configured to provide a switching control signal. And switching according to the above, outputting a video signal when the caption mode is turned off by a key input of the key input section, outputting an overlapping signal between the video signal and the caption signal when the caption mode is turned on, and caption only by key input of the key input section. And a caption control device for outputting an overlapping signal between the mute video signal and the caption signal in the mode. 10. The apparatus of claim 9, wherein the key input unit includes a PAUSE or FREEZE key having a caption stop function, a BRIGHT key having a brightness control function of a caption, a POSITION key having a caption position adjusting function, and an opacity, translucent or Image caption control device comprising one or a combination of a FILTER key having a transparent control function, a key for changing the color of the background screen, a key for adjusting the number of displayed caption lines, a key for muting the voice. 7. The personal computer as set forth in any one of claims 1 to 6, wherein said video apparatus employs any of NTSC, PAL, and SECAM methods. Apparatus and caption control apparatus, characterized in that any one of, and set-top box (STB). In the video device caption control method for a video device caption control device, Keying in a caption control command; A video signal, a caption signal, and a mute video signal are input and switched according to a switching control signal, and one of the superimposition signal of the video signal, the video signal and the caption signal, and the superimposition signal of the mute video signal and the caption signal is selected. A switching step of outputting; And And outputting the switching control signal according to caption data included in the key input and the image signal. The method of claim 12, further comprising: extracting caption data separately from the video signal; Generating a mute image signal for providing a mute image signal; And outputting a caption signal included in the video signal based on the caption control signal. And analyzing the caption data to decode the control code and character code of the caption data to decode the position, display form (attribute), etc., where the caption is to be displayed, and output the decoding result as a caption control signal. How to control the caption of the video device. 15. The method of claim 13, wherein when the video device caption control device is installed inside or outside the video device, horizontal and vertical synchronization signals separated from the video signal in the video device are used in the caption data extraction step and the caption signal generation step. And the output video signal is input to a video input terminal of the video device. 15. The apparatus of claim 13, further comprising: separating a synchronization signal for separating vertical and horizontal synchronization signals from the image signal input from an image output terminal of the image device when the image device caption control device is installed inside or outside the image device. And supplying the separated horizontal and vertical synchronization signals to the caption data extraction step and the caption signal generation step, wherein the video signal output from the video device caption control device is input to the video input terminal of the video device. Video device caption control method. The video output device of claim 13, wherein the video device caption control apparatus is installed between a first video device having an image display function and a second video device having an image receiving function. The signal is input to the video input terminal of the video device caption control apparatus, and supplies horizontal and vertical synchronization signals separated from the video signal to the caption data extraction step and the caption signal generating step in the video device. The video signal output from the caption control device is input to the video input terminal of the first video device, characterized in that the caption control method. The video output device of claim 13, wherein the video device caption control apparatus is installed between a first video device having an image display function and a second video device having an image receiving function. The signal is input to an image input terminal of the caption control device, and in this case, the method further includes a synchronization signal separation step of separating vertical and horizontal synchronization signals from the input image signal, and capturing the separated horizontal and vertical synchronization signals. And a video signal which is supplied to a data extraction step and the caption signal generating step, and the video signal output from the video device caption control device is input to the video input terminal of the first video device. 18. The caption control method according to any one of claims 12 to 17, wherein the caption data extraction step extracts caption data on a predetermined line of the horizontal synchronization signal of the video signal. 19. The method of claim 18, wherein the caption data is data existing in a 21st line of a horizontal synchronization signal. 18. The method according to any one of claims 12 to 17, wherein the key input step includes a step of designating a caption mode on-off and a caption-only mode, and the switching step switches according to a switching control signal, thereby the key input. When the caption mode is turned off, the video signal is output when the caption mode is turned off. The superimposed signal between the video signal and the caption signal is output when the caption mode is turned on. In the caption-only mode, the mute video signal and the caption signal are output. Caption control method for a video device, characterized in that for outputting a superimposed signal. 21. The method of claim 20, wherein the key input step comprises inputting a PAUSE or FREEZE function having a caption stop function, performing a BRIGHT function having a brightness control function of a caption, and performing a POSITION function having a caption position adjustment function. Step, performing a filter function having an opaque, semi-transparent or transparent function of the background portion where the caption is displayed, switching the color of the background, adjusting the number of caption lines displayed, muting the voice The method of claim 1, further comprising a combination of any one or a combination thereof. 18. The personal computer as set forth in any one of claims 12 to 17, wherein said video apparatus employs any of NTSC, PAL, and SECAM methods. , And a set-top box (STB) of any one of the video device caption control method.