Patent ID: 6188445
Filing Date: 2001-02-13
Classification: H04N

Abstract:
A luminance signal and chrominance signal separating circuit comprising.a first band pass filter for obtaining a first signal by passing a predetermined band width of a color video signal,a first 1H delay circuit for delaying said color video signal by one horizontal scanning period,a second band pass filter for obtaining a second signal by receiving the output signal from said first 1H delay circuit and passing said predetermined band width of the delayed color signal, thereby taking out a chrominance signal from said first signal and second signal;a correlation detecting circuit for detecting the correlation between said first signal and second signal, said correlation detecting circuit having a vertical correlation detecting circuit for detecting the vertical correlation of said first signal and second signal; and a horizontal correlation detecting circuit for receiving an output signal from said vertical correlation detecting circuit, and for detecting the correlation in the horizontal scanning period of the entered signala second 1H delay circuit for delaying an output signal from said correlation detecting circuit by one horizontal scanning period;a first logic circuit for receiving the output signal from said correlation detecting circuit and the output signal from said second 1H delay circuit, and performing a logical operation; andan operation processing circuit for receiving said first signal and second signal, and taking out a chrominance signal from the difference between said first signal and second signal or from the first signal only, depending on an output signal of said first logic circuit.