Patent ID: 7113211
Filing Date: 2006-09-26
Classification: H04N

Abstract:
1. A video signal processing circuit comprising: an input terminal receiving one of NTSC video signals, PAL video signals and high definition television transmission color signals; a contour-adjusting circuit configured to receive one of the NTSC video signals, the PAL video signals and the high definition television transmission color signals from the input terminal and peak the received signals for contour adjustment, wherein the contour adjusting circuit further comprises at least one peaking circuit that is configured to peak either the R, G and B signals from video signals in either the NTSC system or the PAL system or only the Y signal from the high definition television transmission color signals; an inverse matrix transforming circuit for separating R, G and B signals from the high definition television transmission color signals; a selecting circuit that controls adjusted NTSC video signals and adjusted PAL signals to bypass the inverse matrix transforming circuit; a determining unit that produces a control signal, wherein in response to the control signal, the selecting circuit changes selection of the at least one switch to relay either the R, G, and B signals in which contour adjustment is performed or the Y signal, in which the contour adjustment is performed, and the Pr signal and the Pb signal, in which contour adjustment is not performed; a plurality of selecting switches configured to be driven simultaneously, wherein the each selecting switch is operated by the selecting circuit that, when the input signals are the R, G, and B signals, the side of the signal peaked by the peaking circuit is selected to be connected to the inverse matrix transforming circuit side, and when the input signals are the HDTV signals, the side of the signal not peaked by the peaking circuit is selected to be connected to the inverse matrix transforming circuit side; and an output terminal outputting video signals that include contour-adjusted R, G and B signals.