Patent ID: 6310658
Filing Date: 2001-10-30
Classification: H04N

Abstract:
A video signal mixing apparatus for digitally mixing a first video signal which is not synchronized with a clock signal and a second video signal which is synchronized with the clock signal, in response to a digital selection signal which is not synchronized with the clock signal, and for outputting the mixed result as a mixed video signal; the apparatus comprising:a signal subtractor for subtracting the second video signal from the first video signal;a weighted value extractor for dividing one period of the clock signal into N intervals for detecting the interval wherein the digital selection signal is generated, and outputting a predetermined value allocated to the detected interval as a weighted value;a multiplier for multiplying the weighted value by the output of the signal subtractor, and outputting the multiplication result; anda signal mixer for mixing the multiplication result with the second video signal and outputting the mixed result as the mixed video signal.