Patent ID: 8208649
Filing Date: 2012-06-26
Classification: H04M

Abstract:
1. A method for reducing acoustic echoes in a plurality of microphone-digital signals sent from a near room to a far room using a computing device, the method comprising: calculating approximate impulse responses using the computing device, each approximate impulse response characterizes an echo path between a loudspeaker and a microphone in the near room, wherein the plurality of impulse responses lie within a model subspace of the space of possible impulse responses and wherein the dimensionality of the model subspace decreases over time by balancing errors associated with reducing the dimension of the model subspace with errors caused by observing noise as a function of reducing the dimensionality of the model subspace using the computing device; and calculating a controlled digital signal using the computing device, wherein the control digital signal is a function of at least one of the approximate impulse responses that lie within the model subspace, wherein the controlled digital signal is sent from the near room to the far room substantially free of acoustic echoes.