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 (f
s
), 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 f
s
=7 kHz with a processing delay of 1.6 msec, the other one with N = 2560 and f
s
= 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.