Programmable digital video processing system

A video processing system comprising:

• input means for receiving signals from a plurality of video sources;
• multiplier the signals from means coupled to the input means, for multiplying at least one programmably selected video source with programmably selected constants to generate a multiplier video source;
• designation means for assigning a priority designation to each of of the video sources;
• resolver means, coupled to the designation means, for generating a source selection signal in response to the priority designation;
• output control means, coupled to the resolver means, input means and multiplier means, for coupling of a selected one of the video sources to an output in response to the source selection signal.

A method for processing video source components from a plurality of video sources comprising the steps of:

• programmably selecting a plurality of video source components from the plurality of video sources to provide a plurality of selected video source components;
• providing an input blend value;
• multiplying the input blend value by a programmable pre-scale ratio to provide a pre-scaled blend source;
• programmably selecting a plurality of constants from among a plurality of constant sources including the prescaled blend source to provide a plurality of selected constants;
• multiplying each selected source component by a respective selected constant to provide a plurality of multiplier outputs;
• summing the plurality of outputs to provide at least one summed multiplier output.

A video processing system comprising:

• input means for receiving signals from a plurality of video sources;
• multiplier means for multiplying signals from at least one selected video source with selected constants to generate a multiplied video source;
• clock means for providing programmable frequency timing signals for the input means and multiplier means comprising means for dividing the frequency of a reference clock signal by a first programmable number to provide a divided reference signal;
• means for dividing the frequency of a selected signal by a second programmable number to provide a divided signal;
• means for comparing the divided reference signal with the divided signal to generate a control signal dependent upon the difference between the frequencies of divided signals;
• voltage controlled oscillator for generating a VCO signal having a frequency controlled by the control signal;
• means for selecting the VCO signal as the selected signal and wherein the selected signal is utilized as a timing signal.