Patent ID: 7881459
Filing Date: 2011-02-01
Classification: H04M

Abstract:
1. An echo canceller, comprising: a first multi-band filter which receives a first input audio signal and generates a first plurality of sub-band signals, each of the first plurality sub-band signals comprising a respective sub-band of the first input audio signal; a second multi-band filter which receives a second input audio signal and generates a second plurality of sub-band signals, each of the second plurality of sub-band signals comprising a respective sub-band of the second input audio signal; a plurality of double talk detectors, each of the double talk detectors generating a double talk flag based on at least a respective one of the first sub-band signals and a respective one of the second sub-band signals; and a plurality of non-linear processors, each of the non-linear processors receiving at least a respective one of the double talk flags from at least one of the double talk detectors, each of the non-linear processors processing the double talk flag to select an amount of attenuation to apply to respective error signals to generate a sub-band output signal having reduced echo.