Hardware system for genlocking

摘要

A computer system includes a graphics controller with a first refresh rate and a first horizontal synchronization signal; a secondary source of video data having a second refresh rate and a second horizontal synchronization signal; and a genlock unit for reconciling the first refresh rate of the graphics controller with the second refresh rate of the secondary source. The genlock unit outputs a clock signal with a frequency modulated to reconcile the first refresh rate and the second refresh rate by monitoring the phase differences of the first horizontal synchronization signal and the second horizontal synchronization signal in response to a first control signal and outputs a clock signal at a frequency corresponding to a selected clock frequency in response to a second control signal.