Patent ID: 6975722
Filing Date: 2005-12-13
Classification: H04B

Abstract:
1. An echo canceller comprising: a receive path having a receive input and a receive output; a send path having a send input and a send output; a first non-adaptive filter for generating a first echo estimation signal; a second segmented adaptive filter for generating a second echo estimation signal; a first subtractor for receiving a send signal from said send path input and for receiving said first echo estimation signal and for generating a first compensated send signal; a second subtractor for receiving said send signal from said send path input and for receiving said second echo estimation signal and generating a second compensated send signal, having an output for providing said second compensated signal to said send path; a means to determine whether a sum of squared reflection coefficients of individual segments of said segmented adaptive filter is greater than −40 dB in said segmented adaptive filter, and for selecting only those coefficients to be used in coefficient generation for said non-adapative filter; and a controller connected to said send path for receiving said second compensated send signal and to said first subtractor for receiving said first compensated send signal wherein