Patent ID: 6507653
Filing Date: 2003-01-14
Classification: H04B,H04M

Abstract:
A method of controlling echo in a communications device, said method comprising:estimating an echo component in an echo-containing signal to produce an estimated-echo signal by processing an echo-causing signal associated with said echo component; canceling a portion of said echo component from said echo-containing signal to produce an echo-cancelled signal based on combining said estimated-echo signal with said echo-containing signal; producing an echo-suppressed signal based on said echo-cancelled signal by attenuating said echo-cancelled signal with a first level of attenuation when operating in a first mode and with a second level of attenuation when operating in a second mode, said second level of attenuation having lesser attenuation than said first level of attenuation; and determining when to change from said first mode to said second mode based on comparing said echo-containing signal with said estimated-echo signal.