Block-exact fast affine projection algorithm

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| 2001年 / Nippon Telegraph and Telephone Corp.卷 / 50期

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Algorithms - Computational complexity - Error compensation - Wave filters;

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摘要：

A block-exact fast affine projection algorithm is described that is suitable for canceling long acoustic echoes. The algorithm has two advantages over conventional block algorithms: it has exactly the same convergence as its sample-by-sample version, achieved by compensation for errors from the sample-by-sample algorithm, and it has a flexible trade-off between complexity reduction and output delay, achieved by introducing two independent block lengths for filtering and updating. Comparison of the block-exact algorithm and with the fast affine projection algorithm under equal complexity conditions showed that the former has a faster convergence rate and a lower residual echo.

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