Joint time-frequency adaptive echo canceller with digital signal processor

Abstract

The paper illustrated a real time implementation of an adaptive echo canceller using the joint time-frequency analysis. Comparing with a classical adaptive echo canceller, which involves an adaptive LMS (or NLMS) filter the joint time-frequency approach involves a number of adaptive filters. The input of each filter is a subsignal derived from original input signal; these subsignals are the coefficients obtained by a joint time-frequency analysis (like Gabor expansion). The advantage is that the subsignals are whitened by the joint time-frequency analysis and therefore the adaptive filters work better.