Patent ID: 8218085

Claim:
A signal separator for separating a luminance signal and a color signal from a composite video signal, the separator comprising: a first band pass element for passing a part of the composite video signal within a color signal band and within a predetermined frequency band, and outputting a filtered signal as a first filtered signal; a second band pass element for passing a part of the first filtered signal within the color signal band and without the predetermined frequency band, and outputting a filtered signal as a second filtered signal; and a first subtraction element for subtracting the first filtered signal from the composite video signal, and outputting a subtracted signal as a first subtraction signal, wherein the predetermined frequency band is a frequency range in which the color signal and the luminance signal in the composite video signal are mixed together, the predetermined frequency band is disposed along a boundary curve between the color signal and luminance signal, wherein: the first band pass element is characterized by a frequency response given by a first curve, the second band pass element is characterized by a frequency response given by a second curve, the first curve is wider than the boundary curve between the color signal and the luminance signal, the second curve is narrower than the boundary curve between the color signal and the luminance signal, and the first curve and the second curve therebetween have a frequency region that substantially corresponds to the predetermined frequency band.