Patent ID: 9363600
Filing Date: 2016-06-07
CPC Classification: H04M,H04R

Claim Text:
1. A method for suppressing residual echo, comprising: detecting sound by a microphone at a near-end location to produce a microphone signal; performing echo cancellation on the microphone signal to remove a portion of echo, wherein performance of echo cancellation generates an echo cancelled signal and an estimate of a linear echo component of the echo; converting the echo cancelled signal and the estimate of the linear echo component to frequency domain; estimating echo leakage based on the frequency domain echo cancelled signal and the frequency domain estimate of the linear echo component to produce initial echo leakage values for sub-bands of the frequency domain echo cancelled signal; adjusting the initial echo leakage values based on a statistical analysis between the initial echo leakage values to generate final echo leakage values; and generating a final residual echo estimate based on the final echo leakage values.