VLSI architecture of the generalized multi delay frequency-domain algorithm for acoustic echo cancellation

Within the context of acoustic echo cancellation, the convergence rate of the NLMS adaptive filtering algorithm is not sufficient when the input signal is strongly correlated (speech signal). The GMDFα algorithm allows a faster convergence rate and faster tracking of the variation in the echo path to be identified. In these applications the filter may have several thousand tap length at a sampling rate of 16 kHz. This fact leads to difficulties in real time implementation of the algorithm. The paper describes an optimized architecture of a specific circuit which is designed to perform the computational intensive task of the GMDFα algorithm in real time. It can be carried out for long impulse response filters