Patent ID: 8094237

Claim:
A signal separation apparatus applied in an image transmission system to extract a chrominance signal from an analog composite video signal, the signal separation apparatus comprising: an analog-to-digital converter, for generating a digital composite video signal by sampling the analog composite video signal; a median filter, coupled to the analog-to-digital converter, for generating a reference luminance signal according to the digital composite video signal; and a subtractor, coupled to the analog-to-digital converter and the median filter, for generating the chrominance signal according to a difference between the digital composite video signal and the reference luminance signal a comb filter, coupled to the subtractor, for generating a filtered chrominance signal according to the chrominance signal; and a subtractor, coupled to the comb filter and the analog to digital converter, for generating a luminance signal of the analog composite video signal according to the difference between the digital composite video signal and the filtered chrominance signal; wherein the digital composite video signal comprises a plurality of pixel data corresponding to at least one horizontal scan line in a frame, and the median filter performs a median computation upon a plurality of pixel data at the same horizontal scan line to generate the reference luminance signal.