A New Structure for Combining Echo Cancellation and Beamforming in Changing Acoustical Environments

Burton, Trevor; Goubran, Rafik

doi:10.1109/icassp.2007.366620

Cited by 5 publications

(7 citation statements)

References 9 publications

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“…The same block matrix structure has been used in [14], [15] for the implementation of the GSCbased BF-AEC acoustic echo canceler. Using (30) in (35) and noting from (25)…”

Section: B Implementation Using the Gsc Formmentioning

confidence: 99%

Statistical Analysis of a Jointly Optimized Beamformer-Assisted Acoustic Echo Canceler

Maruo

Bermudez

Resende

2014

IEEE Trans. Signal Process.

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This work presents a statistical analysis of a class of jointly optimized beamformer-assisted acoustic echo cancelers (AEC) with the beamformer (BF) implemented in the Generalized Sidelobe Canceler (GSC) form and using the least-mean square (LMS) algorithm. The analysis considers the possibility of independent convergence control for the BF and the AEC. The resulting models permit the study of system performance under typical handling of double-talk and channel changes. We show that the joint optimization of the BF-AEC is equivalent to a linearly-constrained minimum variance problem. Hence, the derived analytical model can be used to predict the transient performance of general adaptive wideband beamformers. We study the transient and steady-state behaviors of the residual mean echo power for stationary Gaussian inputs. A convergence analysis leads to stability bounds for the step-size matrix and design guidelines are derived from the analytical models. Monte Carlo simulations illustrate the accuracy of the theoretical models and the applicability of the proposed design guidelines. Examples include operation under mild degrees of nonstationarity. Finally, we show how a high convergence rate can be achieved using a quasi-Newton adaptation scheme in which the step-size matrix is designed to whiten the combined input vector.Index Terms-Acoustic echo cancellation, adaptive filtering, beamforming, generalized sidelobe canceller, statistical analysis

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“…The same block matrix structure has been used in [14], [15] for the implementation of the GSCbased BF-AEC acoustic echo canceler. Using (30) in (35) and noting from (25)…”

Section: B Implementation Using the Gsc Formmentioning

confidence: 99%

Statistical Analysis of a Jointly Optimized Beamformer-Assisted Acoustic Echo Canceler

Maruo

Bermudez

Resende

2014

IEEE Trans. Signal Process.

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“…Most of available comparisons are mainly experimental [5][6][7]. Such results are of great value, but should be complemented by theoretical results which help understanding the relative merits of different solutions.…”

Section: Introductionmentioning

confidence: 97%

“…A multichannel solution that has gained popularity in recent years combines acoustic echo cancellation (AEC) and beamforming [4][5][6][7][8][9]. Different structures combining AEC and a beamformer (BF) have been proposed and compared for performance.…”

Section: Introductionmentioning

confidence: 99%

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On the optimal solutions of beamformer assisted acoustic echo cancellers

Maruo

Bermudez

Resende

2011

2011 IEEE Statistical Signal Processing Workshop (SSP)

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Acoustic echo cancellation constitutes a major challenge for fullduplex communication and human-machine speech interaction. Beamforming is a well-known technique for suppression of local interferers, including acoustic echoes. Those techniques can be combined to jointly achieve better echo cancellation at an additional computational cost. Experimental results available in the literature show significant increase in echo cancellation performance when assisted by a beamformer. Different implementation schemes have been proposed. Performance comparisons of these solutions have been mostly experimental, which limits the generalization of the results. This work compares the optimal solutions provided by the original cascaded BF-AEC structure and by the alternative scheme that jointly optimizes the beamformer and the acoustic echo canceler coefficients.

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“…A combined time domain microphone array beamforming and echo cancellation system is described in [113]. This structure could provide the foundation for applying the proposed EC structures into a multi-microphone hands-free system.…”

Section: Suggestions For Future Researchmentioning

confidence: 99%

Efficient subband structures for acoustic echo cancellation in nonstationary and nonlinear environments

Burton¹

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A New Structure for Combining Echo Cancellation and Beamforming in Changing Acoustical Environments

Cited by 5 publications

References 9 publications

Statistical Analysis of a Jointly Optimized Beamformer-Assisted Acoustic Echo Canceler

Statistical Analysis of a Jointly Optimized Beamformer-Assisted Acoustic Echo Canceler

On the optimal solutions of beamformer assisted acoustic echo cancellers

Efficient subband structures for acoustic echo cancellation in nonstationary and nonlinear environments

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