Patent ID: 8620232
Filing Date: 2013-12-31
Classification: H04M

Abstract:
1. An attenuation circuit configured to attenuate a transmit signal in one or more spectral bands based on a receive signal; wherein the transmit signal comprises an echo of the receive signal; wherein the echo comprised within the transmit signal comprises distortions incurred by the receive signal when being rendered by an electronic device having rendering characteristics; wherein the circuit is configured to compare a plurality of energy values of the receive signal in a plurality of spectral bands with a corresponding plurality of spectral band dependent distortion thresholds; determine that for a first spectral band from the plurality of spectral bands, a first energy value from the plurality of energy values exceeds a corresponding first distortion threshold from the plurality of distortion thresholds; and attenuate the transmit signal in one or more spectral bands from the plurality of spectral bands at frequencies higher than the first spectral band with corresponding one or more spectral band dependent attenuation factors; wherein the one or more spectral band dependent attenuation factors are based on the rendering characteristics of the electronic device.