Patent ID: 6895095

Claim:
A method of eliminating interference in a microphone signal, which interference is caused by components of a source signal that is present as a reference signal (x) and, following a pass through a transfer section with a priori unknown transmission function (G), is superimposed in the microphone signal as an interference signal (r) on a voice signal (s), said method comprising: adaptively simulating the interference signal, and providing an output signal which has been compensated for the actual interference signal by subtraction of the simulated interference signal from the microphone signal, and wherein the microphone signal is simultaneously transformed to the frequency domain, the signal compensation occurs in the frequency domain, and the output signal present in the frequency domain is linked with the reference signal present in the frequency domain for the adaptation of the simulation of the reference signal, transforming the output signal spectrum to the time domain, doubling the time signal length by placing zeros in front of the time signal, transforming the length and time signal back to the frequency domain and, using the transformed frequency domain signal for the simulation of the transfer function.