Circuits, methods, and apparatus that reduce the peak or maximum EMI generated by video signals provided to a CRT or digital display monitor. One exemplary embodiment provides for spreading the spectrum of the video signal in order to spread or diffuse its peak spectral component. This may be done by...http://www.google.com.hk/patents/US7443389?utm_source=gb-gplus-share專利 US7443389 - Pixel clock spread spectrum modulation
