| 摘要 |
PURPOSE:To generate a sampling clock for optimum A/D conversion for even an unknown video signal in the video equipment applying A/D conversion to a video signal. CONSTITUTION:The sampling clock generating circuit is made up of a pulse width measurement circuit 6 measuring the pulse width of a video signal, an MPU 4 measuring a frequency or a period of a synchronizing signal, and a clock generating circuit 3 to generate the sampling clock of an A/D converter circuit 1, and the pulse width measurement circuit 6 measures the pulse width of the video signal and the MPU 4 calculates frequency division information N. |
