Echo canceller using short time spectral analysis

摘要

The communications device (1) includes a spectral analyser (7), for providing short-term spectral values (Y(i)) for the received signal (E) with a superimposed transmission signal echo component. The spectral values are fed to an echo compensator (8), providing difference values between the spectral values for the received signal and estimated short-term spectral values for the echo signal. The obtained difference values are evaluated via a speech recognition device (13). Pref. the short-term estimated values for the echo signal are provided by adaptive weighting of the short-term spectral values (X(i)) of the transmission signal.