KR19990026547U - TV's subtitles and OSD overlay control - Google Patents

Abstract

The present invention relates to an apparatus for preventing overlapping output of a caption of a television and an OSD, and relates to an apparatus for displaying a caption and an OSD output on a screen of a television at different positions without overlapping. The present invention has a video signal conversion and storage function and a data discrimination function, and converts the video signal output from the video detector into a digital data code so that each frame is stored in the frame memory. The microcomputer receiving the output position information of the determined subtitle applies an OSD output position variable control signal to an OSD processor so that the subtitle and the OSD screen are displayed at different positions so that the subtitle information is hidden on the OSD screen. The present invention proposes a device for preventing overlapping output of subtitles and OSD of a television that is delivered to a user accurately and resolves inconvenience in viewing.

Description

Device for preventing overlapping output of TV subtitles and OSD

The present invention relates to an apparatus for preventing overlapping output of a caption of a television and an OSD, and relates to an apparatus for displaying a caption and an OSD output on a screen of a television at different positions without overlapping.

In general, a television receives a radio wave transmitted from a transmitting side, demodulates a color composite video signal into a luminance signal and a chromaticity signal, and displays the same on a CRT. That is, the frequency of the desired channel in the tuner is selected, the same intermediate frequency is always made in the intermediate frequency amplifier of the next stage, and when the image detection is performed, the color composite video signal is output. The color composite image signal is separated into a luminance signal and a chroma signal through a comb filter, and the luminance signal is amplified by a delay circuit by a time delay when demodulating the chroma signal and applied to the cathode of the CRT. The RY and BY signals, which are chromaticity signals, control RGB electron beams of the CRT to reproduce a wide range of colors in each pixel unit. The 22KV high voltage applied to the CRT serves to guide the RGB electron beam to reach the screen accurately.

In addition, the above-mentioned general television is provided with a caption transmission / reception function and an OSD function, so that a user who receives a caption signal mixed with a color composite video signal increases information recognition. However, since the OSD screen output according to the user's selection is always displayed in a fixed position, there is a problem in that the user's information recognition is inconvenient by covering the caption information.

Therefore, the present invention is devised to solve these problems by focusing on the above problems. An object of the present invention is to provide an apparatus for determining an output position of a caption signal mixed with an RGB image signal so that an OSD screen is displayed at a position not overlapping with the caption.

The technical idea of the present invention required to achieve the object of the present invention is to convert the RGB image signal detected by the image detector into a digital data code, store it in a frame memory, and then determine the subtitle position determined by the subtitle data determination unit. The microcomputer receiving the information applies an output position control signal to the OSD processor so that the OSD screen is displayed at a position different from the subtitle.

1 is a block diagram showing an apparatus for preventing overlapping output of subtitles and OSD of a television according to the present invention.

Figure 2 is a flow chart for explaining the overlapping output prevention device of the subtitles and OSD of the television of the present invention.

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

100: antenna 151: high frequency amplifier

152: mixing unit 153: local oscillation unit

200: IF amplifier 250: image detector

300: video amplifier 350: mixer

400: CRT 450: First frame memory

500: A / D converter 550: microcomputer

600: caption data discrimination unit 650: second frame memory

700: OSD processor 750: Key input unit

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

1 is a block diagram showing an apparatus for preventing overlapping output of subtitles and OSD of a television according to the present invention.

Referring to FIG. 1, the present invention provides a high frequency amplification unit 151 for amplifying a high frequency signal, which is a complex video signal received from an antenna 100, and an input signal and a local oscillation unit amplified from the high frequency amplification unit 151. A tuner unit 150 including a mixing unit 152 for receiving a local oscillation frequency from the 153 and converting it into an intermediate frequency, and a local oscillating unit 153 for supplying a signal for frequency conversion to the mixing unit 152; IF detection unit 200 for intermediate frequency amplification of the composite image signal applied from the tuner unit 150 and image detection for extracting an image signal from the intermediate image amplification applied with the intermediate frequency from the IF amplification unit 200. The image detector 250 according to a control signal of the unit 250, the video amplifier unit 300 for amplifying and processing the RGB image signal output from the image detector 250, and the microcomputer 550 described later. RGB video signal output from A first frame memory 450 and a second frame memory 650 for storing the converted A / D converter 500 and the RGB image signal digitally converted by the A / D converter 500, one frame at a time And a caption data determination unit 600 for comparing and discriminating data of the digital RGB image signals stored in the first frame memory 450 and the second frame memory 650, respectively, and the signal applied from the key input unit 750. After the digital conversion signal is applied to the A / D converter 500, the caption data discrimination signal is applied from the caption data determination unit 600 to apply the control signal to the OSD processor 700 and the mixing unit (500). The microcomputer 550, an OSD processor 700 that receives the control signal of the microcomputer 550 and outputs an OSD RGB signal and a switching signal, and the RGB signal from the video amplifier 300 and the OSD processor 700, respectively. And a mixer unit 350 that receives and outputs an OSD RGB signal and a switching signal, and It comprises a CRT (400) to reproduce the video signal output from the mixer mixing unit 350 on the display.

Hereinafter, the operation according to an embodiment of the present invention made as described above will be described in detail.

First, the high frequency signal received from the antenna 100 of the television is matched with the input impedance of the high frequency amplifier 151 and the characteristic impedance of the feed line through an input circuit (not shown) of the tuner 150. The high frequency amplifying unit 151 outputs the high frequency amplifying unit 151 to increase the gain of the received high frequency signal, improve selectivity, and prevent image disturbance. In addition, the S / N ratio is improved, and the local oscillation frequency output from the local oscillator 153 is prevented from being radiated to the antenna 100 to affect other receivers.

In addition, the signal amplified by the high frequency amplifier 151 and the frequency output from the local oscillator 153 are input to the mixer 152, the mixer 152 mixes the high frequency signal and the local oscillation frequency To generate an intermediate frequency corresponding to the difference between the two frequencies.

In addition, the intermediate frequency signal output from the tuner unit 150 is amplified through the amplification process of the IF amplifier 200, and then output to the image detector 250, and the image detector 250 is the intermediate frequency. After detecting only the RGB image signal among the signals, it outputs to the video amplifier unit 300. The video amplifier unit 300 separates the color signal (C signal) and luminance signal (Y signal) mixed in the RGB image signal. After combining with the burst signal, the color difference signal (RY, BY) is detected and amplified to generate an RGB image signal, which is a primary color signal, and amplified by the size necessary for the output of the CRT 400 to be output to the mixer unit 350. .

Here, since the output position of the OSD screen displayed on the screen of the television is fixed, the user controls the key input unit 750 to prevent the user from overlapping the subtitle and the OSD screen on the screen of the CRT 400. And an overlapping prevention signal of the OSD screen, and the overlapping prevention signal generated from the key input unit 750 is received by a signal receiver (not shown) mounted in a system of a television, and then detected by the microcomputer 550. .

As described above, the microcomputer 550 that detects the overlapping signal of the subtitle generated from the key input unit 750 and the OSD screen is controlled by the A / D converter 500 connected to the image detector 300. The A / D converter 500 receives an RGB image signal from the image detector 250 and converts the data into a digital data code by one frame. The data code of the converted digital video signal is applied. Are stored in the first frame memory 450 and the second frame memory 650 one frame at a time.

As described above, the RGB image signal, which is converted into digital data codes and stored in one frame unit, is read by the caption data determination unit 600, and the caption data determination unit 600 determines the position of the same line in which the caption information is located in the two frames. After the subtitle position determination signal is applied to the microcomputer 550, the microcomputer 550 receives the subtitle position determination signal from the subtitle data determination unit 600, and the position at which the subtitle is output is overlapped with the OSD screen. The output position control signal of the OSD RGB signal is applied to the OSD processor 700 so as not to be output.

That is, the OSD processor 700 generates the OSD RGB signal and the switching signal according to the output position control signal of the microcomputer 550 and applies them to the mixer 350.

Accordingly, the mixer 350 receives the RGB image signal, the OSD RGB signal, and the switching signal from the video amplifier 300 and the OSD processor 700, respectively, and then displays the position and OSD of the subtitles by the switching signal. The switching process is performed so that the output positions are different from each other so as to be output through the CRT 400.

Figure 2 is a flow chart for explaining the overlapping output prevention device of the subtitles and OSD of the television of the present invention, the power-on switching step (S10) and the power-on switching step (S10) of the power source of the television is switched on After the power is switched on, while the broadcast program is output through the channel selection of the user, the broadcast program output step (S20) and the broadcast program are output through the broadcast program output step (S20). The superposition prevention signal applying step (S30) to which the superposition prevention signal of the screen is applied, the A / D conversion step (S40) where digital conversion is performed on the RGB image signal after the superposition prevention signal applying step (S30), and the A The digital image signal converted in the / D conversion step S40 is stored in the first frame memory 450 and the second frame memory 650 one frame at a time, and the storage step S50 is performed. Stored digital video scene Subtitle data determination step of determining the subtitle data in step (S60) and the subtitle data is determined in the subtitle data determination step (S60) and OSD generation step of generating the OSD RGB signal and switching signal through the OSD processor 700 (S70) ), The mixing step (S80) of the OSD RGB signal and the switching signal generated in the OSD generating step (S70) and the video amplifier unit 300 is mixed and switched in the mixing step (S80) When the OSD output step (S90) and the caption data determination step (S60) that the OSD is output, if the caption data is not determined, the caption data determination signal applying step (S30) to repeat the process after applying the anti-overlap signal (S30) )

Hereinafter, an operation after the overlap prevention signal applying step S30 will be described with reference to the accompanying drawings.

First, the overlapping signal of the subtitle generated from the key input unit 750 and the OSD screen is detected by the microcomputer 550, and the microcomputer 550 is connected to the image detector 250. After applying the signal conversion control signal to the RGB image signal is converted into a digital data code to be stored in the first frame memory 450 and the second frame memory 650 by one frame, the subtitle data determination unit 600 The caption data discrimination signal is applied to the.

As described above, the caption data discrimination unit 600 receiving the caption data discrimination signal from the microcomputer 550 has the same data code of the digital video signals stored in the first frame memory 450 and the second frame memory 650. The caption position discrimination signal is applied to the microcomputer 550 by determining the position where the caption information is mixed by comparing the lines.

That is, the microcomputer 550 receives the caption position determination signal of the caption data determination unit 600 and applies a control signal to the OSD processor 700 to change the position where the conventional OSD screen is displayed. The 700 generates an OSD RGB signal and a switching signal according to the position control signal of the microcomputer 550 and applies them to the mixer 350.

Therefore, the mixer 350 receives the RGB image signal output from the video amplifier 300 and the OSD RGB signal and the switching signal output from the OSD processor 700, and then displays the OSD RGB signal according to the switching signal. The switching process is performed so that the subtitles are displayed to be displayed away from the position where the subtitles are output to be output through the CRT 400.

As described above, the present invention includes a video signal conversion and storage function and a data discrimination function to convert the video signal output from the video detector into a digital data code so that each frame is stored in a frame memory. The microcomputer receiving the output position information of the caption determined by the data determination unit applies an OSD output position variable control signal to the OSD processor so that the caption and the OSD screen are displayed at different positions, thereby displaying the caption information. It is effectively delivered to the user without the problem of covering the screen and at the same time has the effect of eliminating discomfort in viewing.

Claims (1)

In a television that displays subtitles and OSD screens in different positions, A / D conversion means for converting the RGB video signal output from said television into digital data code; Two frame memory means for storing the video signal digitally converted by the A / D conversion means one frame at a time; Subtitle data discrimination means for discriminating the position of a line for outputting subtitles from the digital data codes stored in the two frame memory means; And a control means for controlling the output position of the OSD screen to be changed from the caption data discrimination means to the OSD generating means in accordance with the caption position discrimination signal.