Patent ID: 9258645
Filing Date: 2016-02-09
CPC Classification: G10L,H04R

Claim Text:
1. A method for determining phase difference, the method comprising: determining a phase of a first signal and a phase of a second signal; determining an instantaneous phase difference between said first signal and said second signal based on said phase of said first signal and said phase of said second signal; filtering said instantaneous phase difference over time for frequencies below a specified frequency threshold; estimating a phase difference between said first signal and said second signal at one or more frequencies above said specified frequency threshold, based on said filtered phase difference of frequencies below said specified frequency threshold; and detecting presence of an audio signal based on signal to noise ratio, signal level or signal power level at one or more frequencies below said specified frequency threshold and including said audio signal in said filtering said instantaneous phase difference over time for frequencies below said specified frequency threshold.