Patent ID: 7561601

Claim:
A method of synchronizing a first reference digital signal and a second test digital signal that is derived from the first reference digital signal, each having time references, the method comprising: extracting a plurality of time references for the first reference digital signal and the second test digital signal, the first reference digital signal and the second test digital signal including the same initial content; preliminarily synchronizing the first reference digital signal and the second test digital signal based on the extracted time references; determining a first offset between the first reference digital signal and the second test digital signal based on a difference between corresponding time references for the first digital signal and the second test digital signal; and further synchronizing the first reference digital signal and the second test digital signal by extracting a plurality of characteristic parameters associated with the extracted plurality of time references from the first reference digital signal and the second test digital signal, determining a second offset between the characteristic parameters of the first reference digital signal and the second test digital signal, and applying the first offset and the second offset to the first digital signal to synchronize one of audio elements and video elements of the first reference digital signal and the second test digital signal.