KR930017457A

KR930017457A - Luminance Signal Improvement System

Info

Publication number: KR930017457A
Application number: KR1019920000509A
Authority: KR
Inventors: 김상렬
Original assignee: 김광호; 삼성전자 주식회사
Priority date: 1992-01-15
Filing date: 1992-01-15
Publication date: 1993-08-30
Also published as: KR950000764B1

Abstract

이 발명은 영상신호 처리장치에서 색변조신호와 휘도신호가 혼합되어 입력되는 반송파 신호를 수상기에서 분리하는 과정중에, 색변조신호가 휘도신호를 간섭하여 발생하는 화질불량을 개선하기 위한 시스템에 관한 것이다.종래에는 휘도신호와 색변조신호를 분리하는데 있어서 대역필터를 사용하여 분리하였다. 그 결과 분리가 제대로 되지 않았을 때 휘도 신호가 색신호에 영향을 주게 된다. 특히, 휘도신호를 처리하기 위하여 색변조신호를 분리했을 때 미량의 색변조신호가 휘도신호에 남아 있게 된다. 남아있는 색변조신호가 휘도신호로 오인되어 화면에 휘도성분으로 나타나게 되는 크로스루미넌스 현상을 발생시킨다. 그러므로 이런 현상을 줄이기 위하여 이 발명은 색복조기에서 출력되는 색차신호의 경계면을 검출하기 위하여 상기 색복조기에서 출력되는 색차신호의 경계면을 검출하기 위하여 상기 색복조기에서 출력되는 색차신호 중에서 한신호를 입력으로 하여 들어오는 신호를 지연시키기 위한 시간지연회로, 상기한 시간지연회로를 통과하여 출력된 값과 상기 색차 신호중에서 한색차 신호를 반전단자 또는 비반전단자로 입력받아 반전단자의 기준전압 상태에 따라 값을 증폭하여 출력하는 비교기, 상기한 비교기의 출력을 다시 증폭시키기 위하여 버퍼회로를 통하여 나온 신호는 반전단자가 접지되어 있고 비반전단자로 상기한 버퍼회로 출력파형이 입력될 때 색경계면의 색신호의 크기에 따라 가변증폭기의 출력이 출력되어 색경계면의 색간섭 제거신호를 발생하고, 이 신호를 이용하여 휘도신호의 색경계면에 포함된 색변조신호를 제저하는 것을 특징으로 하고 있다.The present invention relates to a system for improving image quality defects caused by color modulation signals interfering with luminance signals during the process of separating a carrier signal input by mixing color modulation signals and luminance signals in a video signal processing apparatus. In the past, band filters were used to separate luminance and color modulation signals. As a result, the luminance signal affects the color signal when separation is not performed properly. In particular, when the color modulation signal is separated to process the luminance signal, a small amount of the color modulation signal remains in the luminance signal. The remaining color modulation signal is mistaken for the luminance signal, causing a cross luminance phenomenon that appears as a luminance component on the screen. Therefore, in order to reduce this phenomenon, the present invention uses one of the color difference signals output from the color demodulator to detect the boundary surface of the color difference signal output from the color demodulator to detect the boundary surface of the color difference signal output from the color demodulator. A time delay circuit for delaying an incoming signal, a value output through the time delay circuit and the color difference signal among the color difference signals are input to an inverting terminal or a non-inverting terminal and amplified according to the reference voltage state of the inverting terminal. Comparator, which is output through the buffer circuit to amplify the output of the comparator again, according to the magnitude of the color signal of the color boundary when the inverting terminal is grounded and the buffer circuit output waveform is input to the non-inverting terminal. The output of the variable amplifier is output so that the color interference elimination signal of the color And a color modulation signal contained in the color boundary surface of the luminance signal by using this signal.

Description

Luminance Signal Improvement System

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제 1 도는 이 발명의 휘도신호 개선시스템을 나타내는 회로도. 제 2 도는 상기 제 1 도의 휘도신호 개선시스템 회로의 주요부분에 대한 출력파형도이다.1 is a circuit diagram showing a luminance signal improvement system of the present invention. FIG. 2 is an output waveform diagram of the main part of the luminance signal improving system circuit of FIG.

Claims

A low pass filter for passing low frequency components from the luminance signal, a high pass filter for separating high frequency color modulation signals of the color boundary from the luminance signal, and a color for removing high frequency color modulation signals of the color boundary contained in the luminance signal A color interference cancellation signal generating means for generating a color interference cancellation signal proportional to the magnitude of the color modulation signal of the color boundary from one of the color difference signals from the demodulator, and according to the color interference removal signal from the color interference removal signal generating means. A first variable amplifier for removing the color modulation signal of the color boundary surface included in the high pass filter output, and a luminance signal from which the color modulation signal of the color boundary surface has been removed by mixing the output of the low pass filter and the output of the first variable amplifier; A luminance signal improvement system comprising: a summer for outputting.

2. The apparatus of claim 1, wherein the color interference cancellation signal generating means is a time delay circuit for delaying an input signal by inputting one signal among the outputs of the color demodulator, and inverting the output of the time delay circuit and the one color difference signal. Only the first and second comparators for comparing the signals inputted to the terminal and the non-inverting terminal and vice versa and inputted to the non-inverting terminal based on the input signal of the inverting terminal, and the constant pulse of the outputs of the first and second comparators And a second variable amplifier for outputting the first and second buffers and the outputs of the first and second buffers to the non-inverting terminal and controlling the output according to the magnitude of the color signal on the color boundary of the luminance signal. A luminance signal improvement system characterized by the above-mentioned.

3. The luminance signal improvement system according to claim 2, wherein the first and second comparators for detecting the color boundary are configured symmetrically.

2. The luminance signal improving system according to claim 1, wherein a time delay circuit is further provided in front of the low pass filter and the high pass filter to synchronize the signal passing through the high pass filter with the delayed color rejection signal.

※ Note: The disclosure is based on the initial application.