Patent ID: 8483398

Claim:
A method for reducing acoustic echoes in a plurality of microphone-digital signals transmitted from a far room to a near room using a computing device, the method comprising: calculating a plurality of approximate impulse responses using the computer device, each approximate impulse response associated with an echo path between a loudspeaker and a microphone in the near room, wherein the plurality of impulse responses lies within a model of the space of possible impulse responses, wherein said model comprises a hyper-dimensional ellipsoid that lies within an impulse response space, the model evolving over time such that an eccentricity of the ellipsoid increases and a size of the ellipsoid decreases to provide a more limited space from which to select subsequent approximate impulse responses; convolving the plurality of approximate impulse responses with digital signals generated in the far room to produce approximate acoustic echoes using the computing device; subtracting the plurality of approximate acoustic echoes from microphone-digital signals generated in the near room and sent to the far room using the computing device; and preserving audio quality without uncorrelating the digital signals from the far room after the approximate impulse responses and approximate acoustic echoes of the far room are determined.