Patent ID: 8787560
Filing Date: 2014-07-22
Classification: G10L,H04M,H04R

Abstract:
1. A method for determining a set of filter coefficients for an acoustic echo compensator in a beamformer arrangement, wherein the beamformer arrangement comprises a microphone array comprising at least two microphones, a beamformer yielding a beamformed signal based on microphone signals from each of the at least two microphones and an acoustic echo compensator operating on the beamformed signal for echo compensation of the beamformed signal, the method comprising: providing from memory a plurality of sets of filter coefficients for the acoustic echo compensator, each set of filter coefficients corresponding to one of a predetermined number of steering directions of the beamformer arrangement, wherein the predetermined number of steering directions is equal to or greater than the number of microphones in the microphone array; determining time delays for the microphones for a current steering direction, wherein the current steering direction is not one of the predetermined number of steering directions corresponding to any one of the sets of filter coefficients stored in the memory; and computing, using a computer processor, an estimate for a current set of filter coefficients for the current steering direction from the time delays for the microphones for the current steering direction and from first and second ones of the plurality of sets of filter coefficients for the acoustic echo compensator which correspond to different ones of the steering directions that are stored in the memory.