With reduction of the block size (increasing the number of subfilters) regular gmdfα can achieve low throughput delay at the expense of system performance. In situations where zero delay is desirable, we propose a new method which is not dependent on the block size. In addition, by using an adaptive reconstruction filter, further performance gains can be achieved with minimal additional computation complexity. Results from experiments performed in a conference room show an increase in the average Echo Return Loss Enhancement (ERLE) of > 2.5 dB for acoustic echo cancellation over the traditional moving average reconstruction filter.

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Conference Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP. Part 1 (of 6)
Citation
Lariviere, J., & Goubran, R. (1998). Gmdfα with adaptive reconstruction filters and zero throughput delay. In ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings (pp. 3553–3556).