KR950020655A - NTSC / PAL Combined Noise Canceling Circuit of Laser Disc Player System - Google Patents

Abstract

The present invention relates to a noise canceling circuit in an NTSC / PAL combined laser disk player system, and more particularly, to an NTSC / PAL combined digital noise canceling circuit that can be used to remove noise in response to an NTSC / PAL signal.

In the laser disc player system, the NTSC signal or PAL signal carried on the laser disc is separated from the luminance signal and the color signal, and the noise is removed by detecting the correlation between adjacent samples using only the luminance signal. When the correlation is detected, the sample interval is adjusted freely to remove perfect noise.

Description

NTSC / PAL Combined Noise Canceling Circuit of Laser Disc Player System

Since this is an open matter, no full text was included.

2 is an NTSC / PAL signal combined noise cancellation circuit applied to an embodiment of the present invention.

3 is a frequency spectrum diagram of a color signal according to the present invention;

4 is a diagram of an NTSC / PAL combined noise canceling circuit diagram applied to another embodiment according to the present invention.

Claims (8)

An NTSC / PAL combined noise canceling circuit of a laser disc player system, comprising: first luminance / color separation means for inputting an NTSC composite video signal to separate a luminance signal (Y1) and a color signal (C1), and a PAL composite video signal; Second luminance / color separation means for inputting and separating the luminance signal Y2 and the color signal C2, and control means for discriminating the input state of the NTSC signal or the PAL signal and generating an NTSC / PAL selection control signal; Signal selection means for selectively outputting the luminance signal and the color signal output from the first to second luminance / color separation means by the NTSC / PAL selection control signal output from the control means, and the luminance selected and output from the signal selection means; Pixel correlation detection and coefficient generation means for inputting a signal to detect a correlation between adjacent pixels by the system clock signal to generate a temporary correlation coefficient within a set range, and the signal selection means From the circuit, it characterized in that the selection outputs the luminance signal and the pixel correlation and detection by inputting the correlation coefficient outputted from the coefficient generating means composed of a system clock signal applied to FIR-type filter means for removing a noise component to the output by. 2. The apparatus of claim 1, wherein the first luminance / color separation means comprises: a first band pass filter (32) for inputting an NTSC composite video signal to extract and output a color signal (C1); The first delay unit 34 outputting time delay and the color signal C1 extracted from the first band pass filter 32 from the composite image signal delayed by the first delay unit 34 are added to the luminance signal ( And a first adder (36) for extracting Y1). The second luminance / color separation means includes: a second band pass filter (38) for inputting an NTSC composite video signal to extract and output a color signal (C2); A second delay unit 34 for outputting a time delay; And a second adder 42 for extracting the luminance signal Y2 by adding the color signal C2 extracted from the second band pass filter 38 from the composite video signal delayed from the second delay unit 40. Circuit characterized in that. 4. The signal selecting means of claim 3, wherein the signal selecting means inputs the color signal C1 output from the first band pass filter 32 and the color signal C2 output from the second band pass filter 38. A first MUX 44 which selects and outputs one by the NTSC / PAL selection control signal of the controller, and a luminance signal Y1 output from the first adder 36 and a color output from the second adder 42. And a second MUX (46) which inputs a signal (Y2) and selects and outputs one by the NTSC / PAL selection control signal of the controller. 5. The apparatus of claim 4, further comprising: a third delay unit (48) for delaying a predetermined time output of the color signal selected by the first MUX (44), a luminance signal from which noise is removed from the adaptive FIR filter means, and the third And a third adder (54) for adding a delayed output color signal from the delayer (48) to output a composite video signal from which noise is removed. An NTSC / PAL combined noise canceling circuit of a laser disc player system, comprising: luminance / color separation means for inputting an NTSC composite video signal to separate luminance signal Y3 and color signal C3 from the luminance / color separation means; Pixel correlation detection and coefficient generation means for inputting the output luminance signal Y3 to detect the correlation between adjacent pixels by the system clock signal and generating a temporary correlation coefficient within a set range, and outputting from the luminance / color separation means And an adaptive FIR filter means for inputting the luminance signal Y3 and the correlation coefficient output from the pixel correlation detection and coefficient generation means to remove noise components and output the system clock signal. 7. The method of claim 6, wherein the luminance / color separation means comprises: a low pass filter 62 for inputting a composite video signal and performing low pass filtering to extract and output a luminance signal; The fourth delay unit 64, the composite video signal delayed output from the fourth delay unit 64 and the luminance signal Y3 output from the low pass filter 62 are added to add a color signal C3. And a fourth adder (66) for extracting and outputting the circuit. 8. The fifth delay unit (68) according to claim 7, wherein the fifth delay unit (68) outputs the color signal (C3) output from the fourth adder (66) by a predetermined time delay, and the luminance signal from which noise is removed from the adaptive FIR filter means. And a fifth adder (74) for adding a delayed output color signal from the fifth delayer (68) to output a composite video signal from which noise is removed. ※ Note: The disclosure is based on the initial application.