Patent ID: 7970122
Filing Date: 2011-06-28
Classification: H04M

Abstract:
1. An echo suppresser apparatus comprising: a noise-enhanced receive-direction echo-canceller to receive a far-end signal (Rin) and to introduce into it an enhancer noise signal; a narrowband detector to receive said far-end signal (Rin); a first narrowband remover; a second narrowband remover; and a send-direction echo-canceller; wherein the narrowband detector is (a) to determine whether or not the received far-end signal (Rin) comprises a narrowband signal; and (b) if the received far-end signal (Rin) comprises said narrowband signal, to provide to the noise-enhanced receive-direction echo-canceller an intermediate signal indicating one or more parameters of the received far-end signal (Rin); wherein, based on said input received by the noise-enhanced receive-direction echo-canceller, the noise-enhanced receive-direction echo-canceller is (i) to process the received far-end signal (Rin), and (ii) to produce a processed signal (Rout); wherein the processed signal (Rout) is transferred to the first narrowband remover, and wherein the first narrowband remover is to perform narrowband removal and to generate a first all-band signal (R′out); wherein the processed signal (Rout) is also sent to a near-end; wherein the second narrowband remover is to receive a near-end signal (Sin), to perform narrowband removal and to generate a second all-band signal (S′in); wherein the send-direction echo-canceller is to receive as inputs the first all-band signal (R′out) and the second all-band signal (S′in).