Patent ID: 6931123
Filing Date: 2005-08-16
Classification: H04M,H04R

Abstract:
1. A method of echo cancellation for an audio conferencing system in which a participant in the conference generates a monaural signal for transmission on an output channel to the other participants, and receives a monaural input channel from each of the other participants, the input channels being combined linearly to provide a spatialised audio output comprising a plurality of audio channels, characterised in that an adaptive filter process is applied to each of the input channels to generate a combined echo cancellation signal for applying to the output channel; in which a separate adaptive filter is provided for each input channel, and the outputs of the filters are linearly combined to form the cancellation signal; and input signals carried by the input channels are individually converted to spatialised signal sets by respective filter banks having selected predetermined transfer functions, wherein the adaptive filters are multiple channel filters, and correlations between the spatialised signal sets are allowed for by an adaptation process driven by data selected according to the selected transfer functions.