KR100211466B1 - Image noise elimination of digtal sound signal for a television - Google Patents

Abstract

The present invention relates to a digital audio signal mixer capable of improving a picture quality of an image by removing a digital audio signal mixed into a video intermediate frequency signal (PIF) and displaying a line-bar noise on an image screen, A P / S demultiplexer for demultiplexing a video intermediate frequency signal and a voice intermediate frequency signal from a broadcast signal received by the antenna; and a demultiplexer An image detector for outputting a composite video signal (CVS) based on a signal output from the audio carrier remover, a video decoder for separating and removing the digital audio carrier signal from the video intermediate frequency signal, A voice demodulation signal removing unit for separating and removing the demodulated digital voice signal from the composite video signal (CVS) And a CRT driver for driving the CRT based on a signal output from the image processor, wherein the CRT driver is configured by processing a signal output from the signal remover to output a luminance signal (Y) and R, G, .

Description

A television receiver equipped with a video noise reduction function by incorporating a digital voice signal

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal protection circuit of a television receiver, and more particularly to a video signal protection circuit of a television receiver, which removes a digital audio signal mixed into a video intermediate frequency signal (PIF) and exhibiting line- And more particularly, to a television receiver having a video noise reduction function by incorporating a digital voice signal so as to improve the picture quality of a television receiver.

A microprocessor included in a television receiver (hereinafter referred to as a TV receiver) is configured to perform a control operation on the entire apparatus based on a user's control command through a remote controller operation or a control program set in the controller. 1 is a diagram for explaining a process of processing a voice signal under the control of a microprocessor in a conventional TV receiver.

In FIG. 1, reference numeral 1 denotes an antenna for receiving an over-the-air broadcast signal, reference numeral 2 denotes a tuner (TUNER) for tuning a broadcast signal of a channel selected by a user among broadcast signals received through the antenna 1, 4 for separating the video intermediate frequency signal PIF and the audio intermediate frequency signal SIF from the IF signal outputted from the IF amplifying section 3; A P / S separating section composed of a surface acoustic wave filter or the like; 5, an audio detecting section for detecting a voice signal from the SIF signal output from the P / S separating section 4; And a video detector (CVS) for outputting a video signal (CVS).

Reference numeral 7 designates a base, a treble, a balance, and the like for the speech signal detected by the speech detector 5 according to a predetermined control signal from the microprocessor 15 to be described later. And 8 denotes a voice amplifying unit for amplifying the voice signal processed by the voice processing unit 7 and outputting the amplified voice signal to the speaker 9 connected to the subsequent stage.

Reference numeral 10 denotes an image processing unit that performs image processing such as contrast, tint, brightness, and the like on a video signal output from the video detector 6 according to a predetermined control signal from the microprocessor 15 And outputs a red (R), green (G), and blue (B) signal corresponding to the video signal. Reference numeral 11 denotes an image processing unit for outputting the CRT 12 based on the RGB signals output from the image processing unit 10. [ And is a CRT driver for driving.

Reference numeral 13 denotes a remote control device for remotely controlling operations of the entire apparatus by the viewer. Reference numeral 14 denotes a receiver for converting an infrared signal transmitted from the remote controller 13 into an electrical code signal. Reference numeral 15 denotes a receiver And executes a control operation for the entire apparatus based on the code signal output from the microprocessor.

Reference numeral 16 denotes a PWM generator for generating a predetermined pulse width modulation (PWM) signal in accordance with a control signal from the microprocessor 15 and includes a base, a treble, (Not shown) necessary for voice processing control such as balance and balance, and 17 is a circuit for integrating the corresponding PWM signal output from the PWM generator 16 to generate a predetermined level signal And an integrating circuit (not shown) for integrating the PWM signals output from the respective components of the PWM generating unit 16 is provided therein.

That is, in the apparatus having the above-described configuration, the microprocessor 15 outputs a predetermined control signal corresponding to the operation of the user's remote controller through the corresponding port to adjust the audio output of the user, The PWM signal is generated in the circuit and the voice processing unit is controlled as a signal obtained by integrating the PWM signal.

Meanwhile, as the income level of consumers has increased recently, the selection patterns of home appliances including television receivers are becoming increasingly multifunctional and advanced, and in order to provide better sound quality in transmission of voice signals in broadcasting stations, A method of transmitting data in a digital form is newly developed and applied.

In the case of NICAM, which is one of the digital signals transmitted by the digital transmission method, when it is received and demodulated on a carrier wave of 33.05 MHz, it is detected in the frequency range of 5.85 MHz, It has sometimes been mixed with a video signal of 38.9 MHz and has been a cause of generation of line bar noise on an image screen.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a video signal processing apparatus and a video signal processing method thereof, which eliminates a digital audio signal mixed into an image intermediate frequency signal (PIF) The present invention has been made in view of the above problems, and it is an object of the present invention to provide a television receiver equipped with a video noise reduction function by incorporating a digital audio signal.

1 is a functional block diagram for explaining a conventional audio signal processing procedure of a conventional television receiver.

2 is a diagram illustrating a state in which a digital voice signal is mixed with a video signal;

3 is a block diagram showing an internal configuration of a television receiver having a video noise canceling function according to an embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

1: Antenna 2: Tuner (TUNER)

3: IF amplification unit 4: P / S separation unit

5: voice detection unit 6: video detection unit

7: voice processing unit 8: voice amplification unit

9: speaker 10: image processor

11: CRT driver 12: CRT

13: remote control device 14:

15: microprocessor 16: PWM generator

17: Integration circuit part 20:

20a: first band blocking filter 20b: first amplifying part

30: Voice demodulation signal removing unit 30a: Second band suppressing filter

30b:

In order to achieve the above object, the present invention provides a television receiver having a video noise reduction function by mixing a digital audio signal, comprising: a P / S separation unit for separating a video intermediate frequency signal and a voice intermediate frequency signal from a broadcast signal received by an antenna; And a demultiplexer for demultiplexing the digital audio carrier signal from the video intermediate frequency signal output from the P / S demultiplexer. The composite video signal CVS is generated based on a signal output from the demultiplexer, A voice demodulation signal removing unit for separating and removing the demodulated digital voice signal from the composite video signal (CVS) output from the video demodulating unit, a signal processing unit for processing the signal output from the voice demodulation signal removing unit And outputs a luminance signal (Y) and R, G, and B tone signals, and a CRT is generated based on signals output from the image processing unit Including CRT driver which is characterized in that configured.

That is, according to the present invention, the image quality of the image is improved by eliminating the digital voice signal that is mixed into the image intermediate frequency signal (PIF) and generates line-bar noise on the image screen. .

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings.

FIG. 3 is a block diagram showing an internal configuration of a television receiver equipped with a video noise reduction function by incorporating a digital voice signal according to an embodiment of the present invention. As for the components performing the same functions as those shown in FIG. 1, The same reference numerals are used, and a detailed description thereof will be omitted.

In FIG. 3, reference numeral 20 denotes a voice carrier rejection unit for separating and removing a digital voice carrier signal localized at 33.05 MHz from the video intermediate frequency signal PIF output from the P / S separator 4, The carrier eliminator 20 includes a first band elimination filter 20a for detecting the digital voice signal of 33.05 MHz and bypassing the digital voice signal to the ground and a second band elimination filter 20a for amplifying a signal output from the first band elimination filter 20a 1 amplification unit 20b.

Reference numeral 30 denotes a voice demodulation signal remover for separating and removing the 5.85 MHz demodulated voice signal from the composite video signal (CVS) outputted from the video detector 6, The signal removing unit 30 includes a second band-stop filter 30a for detecting the 5.85 MHz demodulated voice signal and bypassing the demodulated voice signal to the ground, and a second amplifying unit 30a for amplifying the attenuated signal output from the second band- And a second amplifying unit 30b.

Next, the operation of the apparatus having the above-described configuration will be described.

When the TV receiver is turned on, the tuner 2 selects a broadcast signal of a channel selected by the user among the broadcast signals received by the antenna 1 and outputs an intermediate frequency signal IF of the channel .

The intermediate frequency signal output from the tuner 2 is amplified to a predetermined level by the IF amplifier 3 and is separated into a video intermediate frequency signal PIF and a voice intermediate frequency signal SIF in the P / The first band stop filter 20a in the voice carrier wave removing unit 20 separates the voice carrier signal of 33.05 MHz from the video intermediate frequency signal PIF and then bypasses the detected voice carrier signal to the ground .

Meanwhile, the first amplifying unit 20b amplifies the attenuated video intermediate frequency signal to a predetermined level through the first band elimination filter 20a.

The video detector 6 outputs the composite video signal CVS based on the video intermediate frequency signal outputted from the audio carrier remover 20 and the second band stop The filter 30a detects a demodulated digital voice signal of 5.85 MHz from the composite video signal CVS and bypasses it to the ground.

The video signal with the audio signal removed is amplified to a predetermined level by the second amplifying unit 30b and then output to the image processing unit 10 using the corresponding R, G, and B tone signals and the luminance signal Y As a result, an image screen in which line bar noise is removed through the CRT driving unit 11 is output through the CRT 12. [

That is, according to the embodiment, it is possible to eliminate the line-bar noise phenomenon appearing on the screen by eliminating the digital voice signal which is mixed and interfered in the video intermediate frequency signal PIF.

The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the technical scope of the present invention.

Claims (1)

A P / S separator for separating a video intermediate frequency signal and a voice intermediate frequency signal from the broadcast signal received by the antenna, A demultiplexer for demultiplexing the digital audio carrier signal from the video intermediate frequency signal output from the P / S demultiplexer, A video detector for outputting a composite video signal (CVS) based on a signal output from the voice carrier remover, A voice demodulation signal removing unit for separating and removing the demodulated digital voice signal from the composite video signal (CVS) output from the video detector, An image processing section for processing the signal output from the speech demodulation signal removing section to output the luminance signal (Y) and the R, G, and B tone signals; And a CRT driver for driving the CRT based on the signal output from the image processor. [Claim 10] A television receiver having a video noise reduction function by incorporating a digital audio signal.