KR100245122B1 - Apparatus and method for controlling video caption - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for controlling video subtitles, wherein the video subtitle control enables the viewer to control foreign language subtitles displayed on the screen of a television when the viewer plays back and watches a videotape recorded in a foreign language for foreign language learning. An apparatus and method are provided. That is, in the present invention, when the caption of the video is not displayed and only the image is to be viewed, the caption signal controller detects the caption signal from the video signal output from the video input unit so that the caption signal is not output by using a filter or the like. A video subtitle control apparatus and method for compensating for a video signal positioned at a level immediately after a subtitle signal to be filled in a canceled part is provided in a compensator so that a clean screen can be viewed when the subtitle is erased.

Description

Video Subtitle Control Device and Method

The present invention relates to an apparatus and method for controlling video subtitles, and more particularly, to enable a viewer to control foreign language subtitles displayed on a screen of a television when a viewer plays a video tape recorded in a foreign language in order to learn a foreign language. Apparatus & method for controlling video caption.

In general, a video tape recorder is a device for reproducing a video signal and an audio signal recorded on a magnetic tape. The recording process of the video signal is as follows.

First, when NTSC signal is input, AGC (Auto Gain Control) adjusts to 1V _PP because the modulation index of FM signal is greatly changed unless the level of input signal is adjusted to the specified level. In the video signal, 3.58MHz fsc is multiplexed, and the 2fsc component removes the second harmonic because the interference signal is generated during the FM conversion. The pre-emphasis connected to the low pass filter emphasizes the high range in order to improve the SN ratio of the reproduced signal because the high-frequency SN ratio deteriorates due to the triangular noise of the FM at the high frequency during demodulation of the FM signal. The high frequency is attenuated by de-emphasis during demodulation to obtain flat characteristics. In addition, in a white peak clipper connected to the pre-emphasis, spikes are generated in the rising and falling portions of the signal by the pre-emphasis, thereby preventing the spike tip from being overmodulated. The clip is about 130%, and the clamp clamps the synchronous end to a constant voltage in order to make the relationship between the image signal waveform and the carrier frequency constant in the next FM modulator. In addition, the FM modulator uses a multivibrator as an oscillator whose oscillation frequency changes according to the input level, and is converted into a recording signal, and the high pass filter uses a band for multiplexing the low-pass color signal for recording. Make.

In addition, the recording of the audio signal is directly superimposed by the high frequency bias current, and the recording relative speed is the same as the tape traveling speed. The oscillator is a 50-100 KHz sine wave common to the erasing head and the high frequency bias. The oscillation voltage changes according to the high frequency bias current value, so the regenerative voltage is adjusted to maximum. To obtain a flat characteristic.

When the video tape on which video and audio signals are recorded is put into a VTI and operated using a remote controller as described above, a foreign language subtitle mixed in the video and video signals recorded on the video tape is displayed on the screen of the television. The audio signal is output through the speaker of the television. At this time, because the subtitles of foreign languages are displayed on the screen of the television, in order to learn a language without watching the screen of the television, it is inconvenient to turn the eyes in a different direction or to close the language. have.

The present invention has been invented to solve the above problems, by using a control function and a compensation function of the subtitle signal video subtitle control device to erase the subtitle when the subtitle erase signal occurs, to compensate for the portion of the subtitle is erased And to provide a method.

1 is a block diagram showing a video caption control apparatus according to the present invention.

FIG. 2 is a block diagram illustrating a compensator, which is a main part of FIG. 1.

3 is a flowchart illustrating a subtitle control method according to the present invention;

<Description of the symbols for the main parts of the drawings>

100: antenna 110: tuner circuit

120: voice IF unit 130: voice signal amplifier

140: speaker 150: video IF unit

160: image signal amplifier 170: switching unit

180: video signal demodulation unit 190: water pipe drive

200: award hall 210: video input unit

220: caption signal control unit 230: memory unit

241: A / D conversion IC 242: line memory

243: data processing unit 244: D / A conversion IC

245: clock generator 246: control unit

250: microcomputer 261: TV / video switch button

262: subtitle play button 263: subtitle mute button

Hereinafter, with reference to the accompanying drawings will be described a specific embodiment for achieving the above object of the present invention.

1 is a block diagram showing a video caption control apparatus according to the present invention.

Referring to FIG. 1, the present invention provides a tuner circuit unit 110 for selecting a high frequency signal, which is a composite video signal received through an antenna 100, and converting it into an intermediate frequency in order to watch a broadcast program of a television, and the tuner. An audio IF unit 120 for detecting the audio signal from the composite video signal applied from the circuit unit 110 and amplifying the intermediate frequency and outputting the audio signal to the audio signal amplifier 130 so as to be output through the speaker 140. The tuner circuit unit The image IF unit 150 which detects the video signal from the composite video signal applied from the 110 and amplifies the intermediate frequency, and the image signal that is applied by the intermediate frequency amplification from the image IF unit 150 to a signal level capable of signal processing. The video signal amplifier 160 to amplify, the video signal and video signals applied from the video signal amplifier 160 and the video input unit 210, respectively, of the microcomputer 250 which will be described later Switching unit 170 for switching in accordance with the fish signal, and the image signal applied from the switching unit 170 after the luminance processing and color demodulation process amplified by the water pipe drive 190 to be displayed on the water pipe 200 The video signal demodulation unit 180 applied to the video signal, the video input unit 210 for applying the video signal to the switching unit 170, and the caption signal mixed with the video signal applied from the video input unit 210 are detected. A caption signal controller 220 for reproducing and erasing, a memory unit 230 for receiving and storing a caption signal before being erased from the caption signal controller 220, and a video signal output from the video input unit 210. After the digital processing, the caption signal is erased to compensate for the remaining portion of the blank according to the control signal of the microcomputer 250 and the remote controller 260 included in the television system. A microcomputer 250 for controlling the switching unit 170, the caption signal control unit 220, and the compensation unit 240 according to the signal, a TV / video switching button 261 for switching the output state of the television and video, And a remote controller 260 composed of a subtitle playback button 262 for generating a subtitle playback signal for outputting a subtitle of the video and a subtitle erasing button 263 for generating a subtitle erasing signal.

Hereinafter, an operation of an embodiment of the present invention made as described above will be described in detail with reference to the accompanying drawings.

First, the tuner circuit unit 110 converts the high frequency signal received through the antenna 100 into an intermediate frequency that is easy to amplify by selecting a signal of a channel desired by the user, and is output from the tuner circuit unit 110. After the audio signal of the video signal is amplified by the voice IF unit 120, it is applied to the audio signal amplification unit 130, amplified and processed to a size appropriate to the output of the speaker 150 is output through the speaker 140 do.

In addition, the video signal of the composite video signal output from the tuner circuit unit 110 is the intermediate frequency amplified by the video IF unit 150, and then applied to the video signal amplifier 160 to the size of the signal capable of processing the video signal To be amplified. The image signal output through the image signal amplifier 160 is applied to the image signal demodulator 180 via the switching unit 170. The image signal demodulator 180 performs luminance processing on the image signal and performs color signal. Reproduces the signal required to drive the water pipe 200 is applied to the water pipe drive 190.

Here, when the user switches the TV mode from the TV mode to the video mode by operating the TV / video switching button 261 of the remote controller 260 while watching a broadcast program of the television, the switching unit 170 receives the television video signal. The video signal and the caption of the video are displayed on the screen of the television by holding the video signal inputted from the video input unit 210.

At this time, when the viewer selects the subtitle mute button 263 of the remote controller 260 so that only the image is displayed without displaying the subtitles of the video, the signal generated from the remote controller 260 is a signal receiving unit (not shown) of the television. Not applied) to the microcomputer 250. The microcomputer 250 receives the caption erasing signal generated from the remote controller 260 to apply the caption detection signal to the caption signal controller 220, and the caption signal receiving the caption detection signal from the microcomputer 250. The controller 220 detects the caption signal so that the caption signal is not output by using a filter (not shown).

Thus, only the video without the caption outputted is displayed on the screen of the television on which the video and the caption are displayed together.

On the other hand, when the caption reproduction signal is generated by the caption reproduction button 262 of the remote controller 260, the microcomputer 250 applies the read enable signal RE signal to the caption signal controller 220 to store the memory. The caption signal stored in the unit 230 is read and output to the image signal demodulation unit 180 so that the caption is displayed.

FIG. 2 is a block diagram illustrating a compensator, which is a main part of FIG. 1.

Referring to FIG. 2, the A / D conversion IC 241 receives an image signal, which is an analog signal horizontally scanned by including a subtitle signal from the video input unit 210, in units of one horizontal scanning period (1H). The digital signal is converted into a digital signal and output to the line memory 242. The line memory 242 stores the digital signal converted by the A / D conversion IC 241, and is controlled by a control signal of the controller 246 described later. It is applied to the data processing unit 243. The data processor 243 processes and applies data to the D / A conversion IC 244 so that the video signal located at the level immediately after the signal level at which the subtitle is located is located at the level of the subtitle. That is, the D / A converter IC 244 receives the digitally processed signal from the data processor 243 and converts the image signal demodulator 180 into an analog signal filled with a video signal of the next stage at the position where the subtitle signal is erased. Will be applied to. In addition, the clock generator 245 generates a clock (CLOCK) required for the conversion of the A / D conversion IC 241, and the controller 246 accesses the line memory 242 so that the digitally processed signal is a data processor. At the same time, the control signal is applied to the data processing unit 243 so that the video signal located at the signal level immediately following the erased caption is formed. Accordingly, when the caption is erased, the video signal located at the rear level is displayed immediately at the position where the caption is erased so that the screen displayed as a blank due to the caption cancellation is compensated with the screen of the video signal displayed at the rear of the caption signal.

3 is a flowchart illustrating a caption control method according to the present invention, in which a video is outputted (S10) and whether or not a signal for erasing a caption of a video is applied by a user in the video output step (S10). Is determined by the microcomputer 250 (S20), and when the subtitle erasure mode determination step (S20) determines that the subtitle erasure mode is output from the video input unit 210 by the control signal of the microcomputer 250. A subtitle output control step (S70) in which a subtitle signal is detected from a video signal (S50), and when the subtitle is detected in the subtitle signal detection step (S50), the subtitle is erased through the subtitle signal controller 220; Compensating the subtitles in the subtitle output control step (S70) and remaining as blanks by the compensation unit 240 in accordance with the control signal of the microcomputer (S80) and the subtitle erasure mode discrimination In step S20, when the subtitle is not in the subtitle erasing mode, the subtitle signal stored in the memory unit 230 is read and applied to the image signal demodulator 180 according to the control signal of the microcomputer 250 (S30). A subtitle output step (S40) in which the subtitle signal is read in the signal reading step (S30) and normally output on the screen of the television, and a normal image is output when the subtitle is not detected in the subtitle signal detection step (S50) ( S60).

Hereinafter, the operation after the caption erasing mode discrimination step in the method of the present invention will be described in detail.

When the caption mute mode is determined by the microcomputer 250, the microcomputer applies the caption signal detection signal to the caption signal controller 220 connected between the switching unit 170 and the video input unit 210. When the caption is detected in the detection step S50, the caption signal controller 220 prevents the caption from being output by using a filter. After the output of the subtitle is controlled, the microcomputer 250 applies a control signal to the compensator 240 to compensate for the portion of the subtitle erased. That is, the portion where the subtitle is erased is left as a blank. To compensate for this, the A / D conversion IC 241 in the compensation unit 240 outputs an image signal including the erased subtitle from the video input unit 210. After being digitally processed and output to the line memory 242, the data processing unit 243 connected to the line memory 242 is connected to the digital signal through the line memory 242 according to the control signal of the microcomputer 250. Is applied to the D / A converter IC 244 to process the data such that the video signal located at the rear end of the erased subtitle signal level is located at the erased subtitle level. Accordingly, the erased subtitle portion is filled with the image signal displayed within the same horizontal scanning period, thereby displaying the same background screen color.

As described above, in the present invention, when a user watches a video and wants to watch only an image without displaying a subtitle of the video, the subtitle signal controller detects a subtitle signal from a video signal output from the video input unit and uses a filter. While the subtitle signal is canceled, the compensator compensates for filling the video signal located at the next level of the subtitle signal in the portion where the subtitle signal is erased, thereby providing a clean screen when the subtitle is erased.

Claims (3)

A tuner circuit 110 for selecting a high frequency signal, which is a complex video signal received through the antenna 100, and converting it into an intermediate frequency in order to watch a broadcast program of a television; The voice IF unit 120 and the tuner detect the audio signal from the composite video signal applied from the tuner circuit unit 110 and amplify the intermediate frequency to output the audio signal through the speaker 140. An image IF unit 150 for detecting an image signal from the composite image signal applied from the circuit unit 110 and amplifying the intermediate frequency signal; In the television comprising a video signal amplifier 160 for amplifying the video signal applied by the intermediate frequency amplification from the video IF unit 150 to a signal level capable of signal processing, A switching unit 170 for switching the image signal and the video signal applied from the image signal amplifier 160 and the video input unit 210 according to a control signal of the microcomputer 250 to be described later; The image signal applied from the switching unit 170 is subjected to luminance processing and color demodulation processing, and then amplified and applied to the receiving tube drive 190 to be displayed on the receiving tube 200, while the image is applied from the compensating unit 240. Image signal demodulation unit 180 for displaying a signal to the water pipe (200), A video input unit 210 for applying a video signal to the switching unit 170, and a caption signal control unit 220 for detecting and reproducing and deleting a caption signal mixed with a video signal applied from the video input unit 210. Wow, A memory unit 230 for receiving and storing a subtitle signal before being erased from the subtitle signal controller 220; A compensation unit 240 for digitally processing the video signal output from the video input unit 210 and then erasing the caption signal to compensate for the remaining portion as a blank according to the control signal of the microcomputer 250; A microcomputer 250 for controlling the switching unit 170, the subtitle signal control unit 220, and the compensation unit 240 according to a signal generated by the remote controller 260 included in the television system; A TV / video switching button 261 for switching the output state of the television and the video, a caption playback button 262 for generating a caption playback signal for outputting the caption of the video, and a caption muting button for generating a caption elimination signal ( The video subtitle control device, characterized in that consisting of a remote controller (260) consisting of 263. The image processing apparatus of claim 1, wherein the compensator 240 receives an image signal, which is an analog signal horizontally scanned by including a subtitle signal from the video input unit 210, and converts the image signal into a digital signal in units of one horizontal scanning period (1H). The A / D conversion IC 241 output to the line memory 242 and the digital signal converted by the A / D conversion IC 241 are stored and controlled by the control signal of the controller 246 described later. A line memory 242 applied to the 243 and a video signal placed at a level immediately after the signal level where the subtitle erased by receiving the digital signal from the line memory 242 are positioned at the level of the erased subtitle. A data processing unit 243 for processing data and applying it to the D / A conversion IC 244 and a digitally processed signal through the data processing unit 243, and a video signal of the next stage is placed at a position where the subtitle signal is erased. Filled analog scene And a clock generator 245 for generating a clock (CLOCK) required for signal conversion of the A / D conversion IC 241 and applying the D / A conversion IC 244 to the image signal demodulation unit 180. The line memory 242 is accessed to output a digitally processed signal to the data processor 243, and a control signal is applied to the data processor 243 to a signal level immediately after the erased subtitle. And a control unit 246 configured to configure a located video signal. A step of outputting video (S10), A step (S20) of determining by the microcomputer 250 whether a signal for removing a subtitle of a video is applied by the user in the video output step (S10); Detecting the caption signal from the video signal output from the video input unit 210 by the control signal of the microcomputer 250 when it is determined that the caption muting mode is determined in the caption muting mode determining step (S20); A subtitle output control step (S70) in which the subtitle is erased through the subtitle signal controller 220 when the subtitle is detected in the subtitle signal detecting step S50; A step in which the subtitle is erased and left as a blank in the subtitle output control step S70 by the compensator 240 according to the control signal of the microcomputer 250 (S80); In the subtitle erasing mode discrimination step (S20), when the subtitle erasing mode is not included, the subtitle signal stored in the memory unit 230 is read and applied to the image signal demodulation unit 180 according to the control signal of the microcomputer 250 (S30). )Wow, A subtitle output step (S40) in which the subtitle signal is read in the subtitle signal reading step (S30) and normally output on the screen of the television; And if the caption is not detected in the caption signal detection step (S50), outputting a normal image (S60).

Images