Patent ID: 8081260
Filing Date: 2011-12-20
Classification: H04N

Abstract:
1. A color killer circuit, comprising: an analog-to-digital converter configured to convert an input video signal to a digital signal, which is input to a burst amplitude detection unit; the burst amplitude detection unit that detects an amplitude of a color burst included in a composite video signal including signals for a color component and a luminance component; a delay unit that stores, delays, by a predetermined period of time, and outputs the amplitude of the color burst detected by the burst amplitude detection unit; a subtractor that calculates a difference between an output from the burst amplitude detection unit and an output from the delay unit; a first comparator that compares the output from the burst amplitude detection unit with a first threshold value to determine whether or not the output from the burst amplitude detection unit is less than the first threshold value; and a second comparator that compares an output from the subtractor with a second threshold value to determine whether or not the output from the subtractor is greater than the second threshold value, wherein the color killer circuit masks the color component of the composite video signal when the first comparator determines that the output from the burst amplitude detection unit is less than the first threshold value, or when the second comparator determines that the output from the subtractor is greater than the second threshold value.