Patent ID: 9596541
Date: 2017-03-14
CPC Classifications: H04M,H04R

Claim:
1. An echo suppression unit for an electronic device comprising a loudspeaker and a microphone; wherein the microphone is configured to capture a transmit signal; wherein the transmit signal comprises an echo of a receive signal rendered by the loudspeaker; wherein the electronic device exhibits N different distorting frequencies, with N>1; wherein the rendering of a receive signal comprising at least one of the N distorting frequencies triggers resonances of the electronic device; wherein the echo suppression unit is configured to apply a first analysis filter of N pre-determined analysis filters to the receive signal to yield a first analysis filtered signal: wherein the N analysis filters are configured to isolate frequency components of the receive signal at the N distorting frequencies, respectively; wherein the first analysis filters are configured to isolate a first frequency component of the receive signal at a first distorting frequency of the N distorting frequencies; determine, based on the first analysis filtered signal, whether the receive signal comprises a first frequency component at the first distorting frequency causing the echo of the receive signal to comprise a distortion component; wherein the distortion component comprises one or more frequencies which are not comprised within the first frequency component; and apply a first post-filter of N pre-determined post-filters to the transmit signal, if it is determined that the receive signal comprises the first frequency component; wherein the first post-filter is configured to selectively attenuate the distortion component triggered by the first distorting frequency; wherein the N post-filters are dependent on the N distorting frequencies, respectively.