Patent ID: 8754947
Filing Date: 2014-06-17
Classification: H04N

Abstract:
1. A method of determining delay between media signals comprising: receiving a first media signal; extracting a characteristic feature from the first media signal to generate a first feature signal; sampling the first feature signal to produce a first sampled feature signal; receiving a second media signal wherein the second media signal corresponds to the first media signal after traversing a network; extracting the characteristic feature from the second media signal to generate a second feature signal; sampling the second feature signal to produce a second sampled feature; cross-correlating the first and second sampled feature signals to generate a cross-correlation signal; analyzing the cross-correlation signal to identify a current peak position within the cross-correlation signal; subsequently analyzing the cross-correlation signal to identify at least two cross-correlation values within a predetermined distance from the current peak position; generating a fine resolution peak position based on the current peak position and the at least two cross-correlation values; converting the fine resolution peak position into a delay value; and providing a delay signal based on the delay value, wherein the delay signal represents the time delay between the first and second media signals.