Patent ID: 8179476

Claim:
A method of synchronizing an audio signal and a video signal comprising: providing an input audio signal and an input video signal that have a synchronized phase relationship; tagging the input video signal to provide a tagged video signal; tagging the input audio signal to provide a tagged audio signal; transmitting the tagged video and audio signals through a network; analyzing the tagged audio and video signals to determine the extent to which the tagged audio and video signals are unsynchronized; and providing a synchronization signal corresponding to the extent to which the tagged audio and video signals are unsynchronized; wherein the input video signal is tagged by: generating a correlation signal at a correlation signal bit frequency; generating a video correlation waveform gain signal corresponding to the power level of the input video signal within a selected frequency range; providing a video correlation signal based on the correlation signal and the video correlation waveform gain signal; and adding the video correlation signal to the input video signal.