KR20050002179A - Broadcating system in digital television and compensator of video and voice signal using the thereof - Google Patents

Abstract

PURPOSE: A broadcasting system and a receiving signal correction apparatus for a digital television are provided to transmit an image signal having the photographic information including the best luminance, chromaticity and audio information, and to correct display and audio output states of the television on the basis of the photographic information, thereby capable of securing the screen and audio of best quality regardless of an environmental change. CONSTITUTION: A tuner/PLL(107) selects a TV electric wave received by an antenna, amplifies the electric wave as a predetermined level and converts the received video signal into an intermediate frequency. An IF(Intermediate Frequency) amplifying member(105) corrects the video signal with an intermediate frequency bandwidth and performs an automatic gain correction of the video signal. An A/D(Analog/Digital) converter(109) converts the broadcasting signal provided from the IF amplifying member into a digital signal. A digital image processing member(111) extracts only the video signal from the digitalized broadcasting signal. A digital audio processing member(117) extracts only the audio signal from the digitalized broadcasting signal. A control member(103) extracts only the photographic information from the digitalized broadcasting signal and performs an image quality correction or an audio correction of the digital broadcasting screen on the basis of the photographic information.

Description

BROADCATING SYSTEM IN DIGITAL TELEVISION AND COMPENSATOR OF VIDEO AND VOICE SIGNAL USING THE THEREOF

The present invention relates to a signal correction apparatus for digital television, and more particularly, to add video and audio signal information to a broadcast signal of a digital television in order to compensate for qualitative changes in video and audio according to the environment of the digital television. The present invention relates to an apparatus for correcting a received signal of a digital television, capable of performing correction corresponding to a received video and audio signal.

In general, a digital television is a device for receiving a video signal, an audio signal and a synchronization signal radiated through a transmission antenna of a broadcasting station. After processing the received broadcast signal through a tuner and an IF terminal, the baseband signal is converted into an analog form. To digital format. The video signal is extracted only through the video and audio intermediate frequency processing stage, and then converted into digitized video and audio data through an AD converter.

Therefore, digital television is a cutting-edge TV that converts an analog signal into a digital signal and adjusts it by computer circuits. It eliminates noise such as interference of other radio waves, and can select various information and programs, and reproduce various advanced images. In addition, the image of a digital television is 7 times that of SDTV from the standard method (SDTV), which has the same horizontal 640 and vertical 480 resolution as the existing NTSC based on the number of points that can be displayed on the screen. It has the advantage of providing 18 different types of images, ranging from 'HDTV' with a resolution of 1920 by 1080. The sound of digital TV is also adopted Dolby AC-3 system, so that the clear three-dimensional sound that surpasses CD can be reproduced vividly, and the digital TV is capable of two-way transmission, so various additional services such as home shopping and internet are available. The situation is changing a lot of life.

However, such a digital television can provide a high-definition video, but similarly to an analog television, video and audio signals transmitted from a broadcaster are received regardless of a TV reception environment. There is a case where only the video signal provided by. That is, if the setting of the image processing unit of the television corresponding to the received video signal is inappropriately made or if the reference level of the audio signal is inappropriately made, the quality of the image may be degraded regardless of the broadcast signal received.

In addition, although high-definition video is provided for each broadcaster, when the audio processing circuit of the television is set to an amplification degree out of the reference value, the output sound level varies with each channel change, causing a problem of degrading listening feeling.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a broadcast signal with photographing information having a reference value of a video signal and a reference value of an audio signal, and based on the photographing information received from a television. The present invention provides a broadcasting system and a digital signal correction apparatus for digital television, which perform image and audio correction of a television so as to provide the best broadcasting signal transmitted from a yarn yarn regardless of a change in the environment of the television.

According to an aspect of the present invention, there is provided a broadcasting system for digital television, comprising: a television broadcasting station for providing a video signal, an audio signal, a synchronization signal, and photographing information for correcting a display state of the television; And a control device for providing a screen and a sound according to the video signal and an audio signal based on the synchronization signal transmitted from the television broadcasting station, and for automatically adjusting the brightness and chromaticity of the currently displayed screen based on the photographing information. Characterized in that consisting of a television.

According to an aspect of the present invention, there is provided a device for correcting a received signal of a digital television, comprising: a tuner for selecting television amplification received by an antenna and amplifying the received television signal to a predetermined level; An intermediate frequency amplifier for correcting an image signal of an intermediate frequency band output from the tuner and performing automatic gain correction of the image signal; An A / D converter for converting image information, audio signal, and photographing information for display state correction of a television from among broadcast signals provided by the intermediate frequency amplifier 105 into a digital signal; After extracting only the video signal from the digitized broadcast signal, a deflection processor for outputting a video of a display device including any one of a CRT, a TFT, and a PDP based on the video signal; A digital image processing unit for performing screen control; A digital voice processor for extracting only the voice signal among the digitized broadcast signals; And a controller for extracting only the photographing information from the digitized broadcast signal and performing the deflection processing, RGB matrix control, and voice correction based on the photographing information.

Specifically, the control unit includes a system decoder for decoding the shooting information of the broadcast signal; A controller for correcting deflection processing and RGB matrix control of the display apparatus (CRT) to an optimal state based on the photographing code information detected from the system decoder, and correcting the amplification level of the audio signal to a reference value; A data memory for detecting and storing deflection control information, RGB matrix control information, and voice control information of an image screen currently displayed from the deflection control unit, the RGB matrix unit, and the voice control unit; And a driver connected to an output port of the controller to control the deflection processor, the RGB matrix, and the digital voice processor according to the deflection processing, the RGB matrix control, and the level correction control of the voice signal.

1 is a main configuration diagram of a digital television according to the present invention.

FIG. 2 is a diagram illustrating a control unit of FIG. 1.

<Explanation of symbols for main drawings>

103 control unit 105 intermediate frequency amplification unit

107 Tuner / PLL 109 AD Converter

111: digital image processing unit 113: deflection processing unit

115: RGB matrix 117: digital voice processing unit

203: controller 205: program memory

207: data memory 209: system decoder

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1 is a block diagram illustrating the main functions of a digital television according to the present invention. As shown, a tuner / PLL 107 for selecting and amplifying a television radio wave received by Antan to a predetermined level, and converting the received video signal to an intermediate frequency, and correcting the video signal of an intermediate frequency band output from the tuner And a broadcast signal (video, audio signal, synchronization signal, and shooting information) provided from the intermediate frequency amplifier 105 and the intermediate frequency amplifier 105 for performing automatic gain correction of the image signal into a digital signal. A / D converter 109, digital image processing unit 111 for extracting only video signals among digitized broadcast signals, digital audio processing unit 117 for extracting only audio signals among digitized broadcast signals, digitized broadcasting And a control unit 103 for extracting only the shooting information from the signal and performing image quality correction and voice correction on the digital broadcasting screen based on the shooting information.

The digital image processing unit 111 interlocks with the deflection processing unit 113 and the RGB matrix unit 115 for outputting an image of a display device such as a CRT, a TFT, or a PDP to perform screen control on the corresponding display device (CRT). The digital voice processing unit 117 is connected to a speaker of a television to provide voice information of a broadcast signal.

The controller 103 has a system decoder for receiving and analyzing broadcast signal data, such as illumination information and camera condition information, corresponding to the photographing information, which is illustrated in FIG. 2.

As shown, the control unit 103 is a system decoder 209 for receiving shooting information of the broadcast signal, the deflection processing of the display device (CRT) based on the shooting code information received from the system decoder 209 and A controller 203 for correcting RGB matrix control to an optimum state and correcting an amplification level of an audio signal to a reference value, and connected to an output port of the controller 203 to correct the deflection processing, RGB matrix control, and level of an audio signal. A driver 201 for controlling the deflection processor 113, the RGB matrix 115, and the digital voice processor 117 under control.

In addition, the controller 203 stores a data memory 207 for storing deflection control information, RGB matrix control information, and voice control information corresponding to the photographing code information, and a signal correction program for system control for signal correction. The program memory 205 is connected.

The photographing code information is numerical information representing an optimal reference value of luminance information, chromaticity information, and stereoscopic audio information of a video screen, and is digitized in consideration of the photographing state and the reception characteristics of a TV when a broadcast signal is transmitted from a broadcasting station. Information provided.

Meanwhile, the controller 103 automatically sets the deflection control, the RGB matrix control, and the voice control based on the photographing code information, and of course, the user can manually control the remote control or the key panel of the television.

The broadcasting station transmits photographing information together with the broadcasting signal, and the television receives the video signal and the audio signal according to the broadcasting signal through the tuner 107. In addition, an information value of an optimal state of luminance information, chromaticity information, and voice information according to the photographing information is received. The intermediate frequency amplifier 105 extracts the broadcast signal and converts the broadcast signal into digitized information through the AD converter 109. The digital image processor 111 extracts only image information of the broadcast signal converted by the AD converter 109 and separates a deflection signal and an RGB matrix signal corresponding to the image information.

The deflection signal controls the deflection of the display apparatus CRT through the deflection processing unit 113, and the RGB matrix signal is provided to the RGB matrix unit 115 to output an image of the display apparatus CRT. The voice information separated from the AD converter 109 is provided to the digital voice processing unit 117 and is provided to a speaker through a die conversion (DAC).

The shooting information provided by the AD converter 109 is transmitted to the controller 103, and the system decoder 209 of the controller 103 decodes the shooting information and is provided to the controller 203. The controller 203 receives and analyzes the photographing information from the program memory 205 and extracts luminance information, chromaticity information, and audio information of the photographing information. The controller 203 stores the luminance information, chromaticity information, and audio information in the data memory 207, and fetches the color and audio states of the current television.

That is, the controller 203 receives the deflection information of the deflection processing unit 113 through the driver 201, which may be based on the deflection signal provided from the digital image processing unit 111, and the deflection processing unit 113 as necessary. The deflection detection circuit may be added to to extract a current deflection signal therefrom.

In addition, the controller 203 extracts a color value of the video screen, that is, a luminance signal and a chromaticity signal, from the RGB matrix 115 and receives the digitized value. The controller 203 receives the deflection signal value and the RGB matrix value of the video signal currently displayed, and also converts the level value of the audio for each channel of the audio signal into digitized information from the digital voice processor 117. The data is stored in the data memory 207.

The controller 203 fetches the reception screen information corresponding to the photographing information stored in the data memory 207 and the display screen information detected according to the current television image output state, and calculates a mutual difference value. That is, when the luminance value of the received screen information corresponding to the photographing information is compared with the luminance value of the display screen information and the difference occurs, the luminance value of the received screen information is replaced with the luminance value. Therefore, when the luminance value of the image transmitted from the broadcasting station is different from the luminance of the current television, it is corrected.

Correction by contrast between the reception screen information and the display screen information is also performed in the voice processing. For example, if the sound output of the current television is set to an excessive or excessive level, the controller 203 fetches the audio code of the shooting information from the data memory 207 and controls the digital audio processing unit 117 to a reference value. Output at the corresponding voice level.

As described above, the present invention allows to provide an optimum luminance, chromaticity and audio information to a video signal transmitted from a broadcasting station and to display the television on the basis of the optimal luminance information, chromaticity information and audio information through a system decoder of the television. And by correcting the audio output state, it is possible to obtain the effect of ensuring the best image quality and sound quality irrespective of changes in the environment of the television.

What has been described above is only one embodiment for implementing a broadcasting system and a reception signal correcting apparatus of a digital television according to the present invention, and the present invention is not limited to the above-described embodiment, which is claimed in the following claims. As will be apparent to those skilled in the art to which the present invention pertains without departing from the gist of the present invention, the technical spirit of the present invention may be changed to the extent that various modifications can be made.

Claims (4)

A television broadcasting station that provides video signal, audio signal, synchronization signal, and photographing information for display state correction of a television; And A control device for providing a screen and sound according to the video signal and an audio signal based on the synchronization signal transmitted from the television broadcasting station, and for automatically adjusting the brightness and chromaticity of the currently displayed screen based on the photographing information. A broadcasting system for digital television, comprising a television. A tuner for selecting television amplification received by an antenna and amplifying the television signal to a predetermined level and converting the received video signal into an intermediate frequency; An intermediate frequency amplifier for correcting an image signal of an intermediate frequency band output from the tuner and performing automatic gain correction of the image signal; An A / D converter for converting photographing information for correcting display state of a video signal, an audio signal, and a television among broadcast signals provided by an intermediate frequency amplifier into a digital signal; After extracting only the video signal from the digitized broadcast signal, a deflection processor for outputting a video of a display device including any one of a CRT, a TFT, and a PDP based on the video signal; A digital image processing unit for performing screen control; A digital voice processor for extracting only the voice signal among the digitized broadcast signals; And And a control unit for extracting only the photographing information from the digitized broadcast signal and performing the deflection processing, RGB matrix control, and voice correction based on the photographing information. 3. The apparatus of claim 2, wherein the control unit comprises: a system decoder for decoding shooting information of the broadcast signal; A controller for correcting deflection processing and RGB matrix control of the display apparatus (CRT) to an optimal state based on the photographing code information detected from the system decoder, and correcting the amplification level of the audio signal to a reference value; A data memory for detecting and storing deflection control information, RGB matrix control information, and voice control information of an image screen currently displayed from the deflection control unit, the RGB matrix unit, and the voice control unit; And A reception signal of a digital television connected to an output port of the controller, the driver configured to control the deflection processing unit, the RGB matrix and the digital audio processing unit according to the deflection processing, the RGB matrix control, and the level correction control of the audio signal; Correction device. 4. The received signal of a digital television according to claim 2 or 3, wherein the photographing code information is numerical information representing an optimal reference value of luminance information, chromaticity information, and stereoscopic audio information of a video screen. Correction device.