One of the main challenges for a stereophonic acoustic echo canceller is that it suffers from poor convergence which is caused by strong correlation between the input signals. We have proposed a new decorrelation technique which adopts spatial decorrelation to address the problem without altering the input signals. Here, we extend the results to a more generic setting, i.e., a 5.1-channel surround system. In the scheme, the input signals are decomposed and projected into the signal subspace and the noise subspace. When the decorrelated signals are fed to the adaptive filters, the interchannel coherence between the input signals decreases significantly, which provides performance improvement in echo reduction. Experiments in a real-world environment and performance comparison with state-of-the-art techniques are conducted to demonstrate the effectiveness of the proposed technique.
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