Efficient Multichannel NLMS Implementation for Acoustic Echo Cancellation
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An acoustic echo cancellation structure with a single loudspeaker and multiple microphones is, from a system identification perspective, generally modelled as a single-input multiple-output system. Such a system thus implies specific echo-path models (adaptive filter) for every loudspeaker to microphone path. Due to the often large dimensionality of the filters, which is required to model rooms with standard reverberation time, the adaptation process can be computationally demanding. This paper presents a selective updating normalized least mean square (NLMS)-based method which reduces complexity to nearly half in practical situations, while showing superior convergence speed performance as compared to conventional complexity reduction schemes. Moreover, the method concentrates the filter adaptation to the filter which is most misadjusted, which is a typically desired feature.
KeywordsAcoustics Adaptive Filter Complexity Reduction Identification Perspective Reverberation Time
- 7.Naylor PA, Sherliker W: A short-sort M-Max NLMS partial-update adaptive filter with applications to echo cancellation. Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP '03), April 2003, Hong Kong 5: 373-376.Google Scholar
- 9.Schertler T: Selective block update of NLMS type algorithms. Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP '98), May 1998, Seattle, Wash, USA 3: 1717-1720.Google Scholar
- 11.Hänsler E, Schmidt G: Single-channel acoustic echo cancellation. In Adaptive Signal Processing. Edited by: Benesty J, Huang Y. Springer, New York, NY, USA; 2003.Google Scholar
- 16.ADSP-BF533 Blackfin processor hardware reference, Analog Devices, Norwood, Mass, USA, 2005Google Scholar
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