Realization of an acoustic echo canceller on a single DSP

An Acoustic Echo Canceller (AEC) based on the Decoupled Partitioned Block Frequency Domain Adaptive Filter (DPBFDAF) [3, 4] is implemented on a single Digital Signal Processor (DSP), the TMS320C30. This flexible setup makes it possible to choose the sample frequency (fs), the number of coefficients (N) of the adaptive filter and the processing delay independent of one another (only limited by the total complexity). Two implementation examples are given: one with N = 2016 and fs=7 kHz with a processing delay of 1.6 msec, the other one with N = 2560 and fs = 13kHz with a processing delay of 6.5 msec. It is shown that the setup works both for a white noise input signal and a real speech signal.