Patent Number: 6,310,658

Title: Video signal mixing apparatus and method thereof

Abstract: 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.ltoreq.predetermined value.ltoreq.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.

Inventors: Kwak; Mal-Seob (Kyungki-do, KR), Kang; Bong-soon (Kyungki-do, KR)

Assignee: Samsung Electronics Co., Ltd.

International Classification: H04N 9/64 (20060101); H04N 5/265 (20060101); H04N 5/445 (20060101); H04N 5/45 (20060101); H04N 009/74 ()

Expiration Date: 10/30/2018