Patent ID: 9001994
Filing Date: 2015-04-07
Classification: H04M

Abstract:
1. A system, comprising: one or more input filters configured to decompose a microphone signal into a plurality of input sub-signals corresponding respectively to different frequency bands; one or more reference filters configured to decompose a reference audio signal into a plurality of reference sub-signals corresponding respectively to the different frequency bands; a plurality of echo cancellers corresponding respectively to the different frequency bands, wherein the echo canceller corresponding to each frequency band is configured to suppress echoes in an input sub-signal corresponding to a frequency band based at least in part on a reference sub-signal corresponding to the frequency band to produce an echo-suppressed input sub-signal corresponding to the frequency band; a signal synthesizer configured to synthesize an echo-suppressed output audio signal by summing the produced echo-suppressed input sub-signals; and wherein a first adaptive finite impulse response filter of a first of the echo cancellers has a first filter order and a second adaptive finite impulse response filter of a second of the echo cancellers has a second filter order that is different than the first filter order; and wherein the first filter order and the second filter order are based at least in part on a power of the reference sub-signal corresponding to the first of the echo cancellers in relation to an average of the powers of the reference sub-signals of the different frequency bands.