Patent ID: 8107616
Filing Date: 2012-01-31
Classification: H04M

Abstract:
1. An acoustic echo cancellation device for canceling an echo (e) in a microphone signal (z) in response to a far-end signal (x), the device comprising: an adaptive filter unit arranged for filtering the far-end signal (x) so as to produce an echo cancellation signal (y); a combination unit arranged for combining the echo cancellation signal (y) with the microphone signal (z) so as to produce a residual signal (r); a post-processor unit arranged for substantially removing any remaining echoes from the residual signal; and a near-end pitch estimation unit arranged afor estimating the pitch of any near-end signal (s) contained in the microphone signal (z) and (ii) for controlling the post-processor unit in dependence of the estimated pitch of the corresponding any near-end signal (s) such that (ii) (a) harmonics of the estimated pitch of the corresponding any near-end signal (s) may be substantially preserved and (ii) (b) an accidental suppression of the corresponding any near-end signal (s) prevented.