Patent ID: 7310425
Filing Date: 2007-12-18
Classification: H04M

Abstract:
1. A method of adaptively filtering a signal transmitted over a channel, said signal containing an input signal and multiple echo responses, said multiple echo responses to be adaptively filtered, said method comprising the steps of: generating an estimate of an echo response corresponding to each of said multiple echo responses, wherein each of said estimates is generated via the equation: where wherein m=a block time index; λf=an experimental forgetting factor in the frequency domain; D=a diagonal matrix whose elements are the discrete Fourier transform of the first column of the circulant matrix; e=frequency domain error signal; y=channel output signal; G=F F=the Fourier matrix; and generating a sum of said estimates; and generating an error signal representing the difference between said signal and said sum of said estimates; wherein said estimates are generated using a frequency domain recursive least squares algorithm.