Patent ID: 6404886
Filing Date: 2002-06-11
Classification: H04M

Abstract:
A method of canceling echo in an apparatus for communication between a near-end party and a far-end party, comprising the steps of:(a) receiving an acoustic signal, including a near-end component originating from the near-end party and an echo component originating from the far-end party, at a first microphone and a second microphone, obtaining a first microphone output signal from the first microphone and a second microphone output signal from the second microphone; (b) using a first adaptive filter to cancel the echo component in the first microphone output signal, obtaining a first residual signal; (c) using a second adaptive filter to cancel the echo component in the second microphone output signal, obtaining a second residual signal; (d) determining a timing delay between the near-end component in the first residual signal and the near-end component in the second residual signal; and (e) additively combining the first residual signal and the second residual signal according to the timing delay, thereby obtaining an outgoing signal for transmission to the far-end party.