Patent ID: 6411768
Filing Date: 2002-06-25
Classification: G09G,H04N

Abstract:
A sync signal reproducing circuit for a composite video signal in a display device, comprising:a channel selector coupled to receive both a first composite video signal and a second composite video signal from a composite video signal input stage, and for selectively outputting one of the first composite video signal and the second composite video signal as a selected composite video signal in accordance with a composite video selection signal; a digital filter connected to said channel selector for separating a chrominance signal and a luminance signal from the selected composite video signal outputted from the channel selector; and a chroma circuit connected to said digital filter for reproducing and outputting the chrominance signal, and for separating horizontal and vertical sync signals from the luminance signal; wherein said display device includes a microcomputer which generates the composite video selection signal, and said channel selector is connected to said microcomputer for receiving the composite video selection signal therefrom.