Control method of video signal conversion circuit and the video signal conversion circuit

摘要

PPROBLEM TO BE SOLVED: To provide a video signal converting circuit capable of suppressing flickers, miniaturizing a circuit and providing a clear image. PSOLUTION: A first video signal S1 of a progressive system generates a second video signal S2 and a third video signal S3. A filter 60 filters the second video signal S2 based on the first, second and third video signals S1, S2 and S3 to output a fourth video signal S4. The filter 60 calculates ä(A×S1+B×S2+C×S3)/(Nth power of 2)} to filter the second video signal (S2), so that a first coefficient (A) may have a value different from that of a third coefficient (C) when a first condition is met; where the first video signal is S1, the second video signal is S2, the third video signal is S3, the first coefficient is A, a second coefficient is B, the third coefficient is C, and a first natural number is N. The first, second and third coefficients are the coefficients of the first video signal S1, the second video signal S2 and the third video signal S3, respectively. PCOPYRIGHT: (C)2007,JPO&INPIT