Abstract: The present invention discloses a system for adaptively reducing flickers in converting non-interlaced video signals to interlaced video signals. To preserve the original image quality in the non-interlaced video signals, the disclosed system examines the pixel values in at least two adjacent lines to decide if a reduction process should be turned on. If there is a need, the reduction process further examines the difference in the pixels from the adjacent lines to determine how to adjust a corresponding output to eliminate flickers in the resultant converted video signals. The adjusting means is based on an adjusting factor or the calculated difference between pixels which is further used in a function to eventually produce a converted interlaced signal with minimum visual errors.

Abstract: A technique to derive a television color subcarrier frequency signal from a computer video signal is described. A computer generates a computer video signal including a horizontal synchronization signal component. The horizontal synchronization signal component is applied to a subcarrier frequency generator to produce a pixel clock signal and a subcarrier relative phase signal which are applied to a digital encoder. The digital encoder processes the computer video signal, the pixel clock signal, and the subcarrier relative phase signal to generate an analog baseband television signal. The subcarrier frequency generator includes a frequency conversion circuit, a timing source, and a deviation compensator. The conversion circuit receives the horizontal synchronization signal and generates the pixel clock signal. The timing source is used to generate a reference clock signal.