Superdirective Microphone Arrays

Bitzer, Jöerg; Simmer, Klaus Uwe

doi:10.1007/978-3-662-04619-7_2

Cited by 182 publications

(123 citation statements)

References 10 publications

Supporting

Mentioning

122

Contrasting

Unclassified

Order By: Relevance

“…We employed a superdirective design assuming an uncorrelated noise with a power of -30 dB [7]. Here, no near-end speaker was considered, since double talk detection (DTD) schemes can easily be incorporated into the new approach by modifying µ 0 .…”

Section: Simulation Resultsmentioning

confidence: 99%

New Aspects of Combining Echo Cancellers with Beamformers

Kammeyer

Kallinger

Mertins

Proceedings. (ICASSP '05). IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005.

View full text Add to dashboard Cite

In this contribution, we introduce a novel framework for combining approaches for acoustic echo cancellation and beamforming. Classical schemes of combination incorporate the simple concatenation of both subsystems. However, if the echo cancellers come first, they cannot exploit the noise reduction capabilities of the beamformer. In the other setup, a time-variant beamformer can heavily disturb the succeeding echo canceller's convergence. The new approach establishes a possibility to smoothly switch between two possible target functions: the mean squared errors at the beamformer's inputs and its output, respectively. Thus, one combined system benefits from advantages of both classical schemes. The paper contains a theoretical analysis of possible solutions for preceding echo cancellers, which are adapted using the beamformer output. The appropriate modification of the normalized least mean squares algorithm is derivated, too.

show abstract

Section: Simulation Resultsmentioning

confidence: 99%

New Aspects of Combining Echo Cancellers with Beamformers

Kammeyer

Kallinger

Mertins

Proceedings. (ICASSP '05). IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005.

View full text Add to dashboard Cite

show abstract

“…To validate the effectiveness of the proposed post-filter estimation method, we compare its performance to other multi-channel noise reduction techniques, including the MVDR beamformer [18], the generalized Zelinski post-filter [7] and the McCowan post-filter [11], under the assumption of a diffuse noise field. In addition, we provide comparisons with the noise reduction results obtained by using at the output of the MVDR beamformer the "decision directed" Frequency (in Hz) Directivity Factor (dB) Fig.…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…The weight vector W H emerging from the solution of this constrained minimization problem, corresponds to the MVDR or superdirective beamformer and is given by [18,19] …”

Section: Mvdr Beamformermentioning

confidence: 99%

A generalized estimation approach for linear and nonlinear microphone array post-filters

Lefkimmiatis

Maragos

2007

Speech Communication

View full text Add to dashboard Cite

“…The fixed noise-field characteristic is coded in the coherence matrix ΓNN[m] which additionally influences beamformer properties directivity and susceptibility to white noise, and therefore has to be constrained [4,1]. Both, d[m, Θ] and ΓNN[m] depend on to the assumed wave propagation model which may differ from the true (and generally unknown) wave propagation from the source to the microphones.…”

Section: Signal Model and Binaural Multi-channel Noise Reductionmentioning

confidence: 99%

Objective perceptual quality assessment for self-steering binaural hearing aid microphone arrays

Rohdenburg

Goetze

Hohmann

et al. 2008

2008 IEEE International Conference on Acoustics, Speech and Signal Processing

View full text Add to dashboard Cite

In this study a self-steering beamformer with binaural output for a head-worn microphone array is investigated in simulated and realworld conditions. The influence of the underlying sound propagation model on the estimation accuracy of the direction of arrival (DOA) estimation algorithm and the overall performance of the combined DOA-beamformer-system is evaluated. For this, technical performance measures as well as objective quality measures based on perceptual models of the auditory system are used. The self-steering beamformer showed better performance than a beamformer with fixed look-direction for SNR values above -2 dB if the propagation model includes at least a coarse head model.

show abstract

Superdirective Microphone Arrays

Cited by 182 publications

References 10 publications

New Aspects of Combining Echo Cancellers with Beamformers

New Aspects of Combining Echo Cancellers with Beamformers

A generalized estimation approach for linear and nonlinear microphone array post-filters

Objective perceptual quality assessment for self-steering binaural hearing aid microphone arrays

Contact Info

Product

Resources

About