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US 6,310,658 B1Granted
Video signal mixing apparatus and method thereof
AssigneeSamsung Electronics Co., Ltd.
InventorsMal-Seob Kwak, Bong-soon Kang
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AssigneeSamsung Electronics Co., Ltd.
InventorsMal-Seob Kwak, Bong-soon Kang
Estimating the term…
A video signal mixing apparatus and a method thereof, which is capable of minimizing timing jitter caused when onsynchronized video signals are digitally mixed. A signal subtractor subtracts a second video signal synchronized with a clock signal from a first video signal which is not synchronized with the clock signal, and a weighted value extractor divides one period of the clock signal into N intervals, detects the interval where a digital selection signal is generated, among the N divided intervals, and outputs a predetermined value (where 0≦predetermined value≦1) allocated to the detected interval as a weighted value. A multiplier multiplies the weighted value with the output of the signal subtractor and outputs the multiplication result, and a signal mixer mixes the multiplication result with the second video signal and outputs the mixed result as a mixed video signal. Therefore, error causing timing jitter is reduced to 1/N, thereby minimizing dot crawling of the mixed image.
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;
A video signal mixing method 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 outputting the mixed signal as a mixed video signal, the method comprising the steps of:
An apparatus for mixing a first signal (A) which is synchronized with a clock and a second signal (B) which is not synchronized with the clock when a select signal (S) is activated, said select signal is not synchronized to the clock, the apparatus comprising:
Dependencies are inferred from the claim text.