Patent ID: 7822194

Claim:
An audio echo canceller adjusted to provide an echo attenuated output signal from an echo added microphone signal consisting of a near-end audio signal and a far-end audio signal originated echo signal, said audio echo canceller comprising: a first analyze filter configured to divide the far-end audio signal into a number of sub-band reference signals, a second analyze filter configured to divide the echo added microphone signal into a number of sub-band echo added microphone signals, a number of sub-band finite impulse response (FIR) filters including respective sets of sub-band filter taps, each sub-band FIR filter configured to filter an associated sub-band reference signal and output an inverted sub-band echo estimate being added to an associated sub-band echo added microphone signal to provide a sub-band echo attenuated feedback signal, with which an associated set of sub-band filter taps are updated, a first synthesize filter configured to merge corresponding sub-band filter taps from said sets of sub-band filter taps to corresponding full band filter taps being passed to a full band FIR filter, the full band FIR filter configured to generate an inverted echo estimate by filtering the far-end audio signal, the full band FIR filter including a set of full band filter taps, and an adder configured to add the inverted echo estimate to the echo added microphone signal, and to output the echo attenuated output signal.