ECHO SUPPRESSOR AND NON-LINEAR PROCESSOR OF ECHO CANCELLER

摘要

The invention relates to an acoustic echo suppressor and a non-linearprocessor for an echo canceller in a 4-wire data transmissionnetwork. An echo canceller is typically controlled by comparing the powerlevels (PWR IN, PS IN) of the near-end and far-end signals (R IN,S IN). The transfer function of an acoustic echo path is usually very non-uniform. According to the invention, the spectrum of the far-endsignal (R IN) is treated, before the signal power level is calculated, with aweighted filter (21), which models the effect of the transferfunction of acoustic echo. As a result, the double talk dynamics is improved,since high-energy vowels of far-end speech, which normallycause low-energy vowels of near-end speech to be clipped in an echosuppressor, will be attenuated.