Method and apparatus for vertically locking input and output signals

摘要: This invention describes a method and apparatus for vertically locking input output video frame rates. The vertical sync pulse is locked in phase with the pulse, regardless of format frequency. resolution, horizontal refresh rate, delay are all user selectable. Two Phase Locked Loops connected series to achive lock between frames. Locking pulses frames will eliminate mixing pixels from different one frame. first Loop generates pixel clock required satisfy user's display preferences but may not precisely represent desired because current use integer dividers. A second adjusts its output, which reference frequency Loop, until achieved.