A simple adaptive first-order differential microphone

Elko, Gary W.; Pong, Anh‐Tho Nguyen

doi:10.1109/aspaa.1995.482983

Cited by 100 publications

(83 citation statements)

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“…We note that a similar one-tap adaptive weight, but between the forward and backward cardioids, has been used in the context of adaptively placing a null in the rear-half plane [6,7]. A weight β is adapted to minimize the energy of the error signal f (n) − βb(n), where b(n) is the response of a backward facing cardioid.…”

Section: Desired Source Located In ψSmentioning

confidence: 99%

Spatial audio activity detection for hearing aids

Srinivasan

Janse

2008

2008 IEEE International Conference on Acoustics, Speech and Signal Processing

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We present a multi-microphone signal activity detection scheme for hearing aids to differentiate between the periods of activity of desired and interfering sources. The method is designed to provide robust performance in the presence of simultaneously active desired and interfering sources. We exploit knowledge from the hearing aid domain, and the directional processing present in modern hearing aids, to present a framework to design appropriate thresholds for the detection. Experiments confirm robust performance under practical reverberant conditions.

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Section: Desired Source Located In ψSmentioning

confidence: 99%

Spatial audio activity detection for hearing aids

Srinivasan

Janse

2008

2008 IEEE International Conference on Acoustics, Speech and Signal Processing

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“…2, where we zoom-in from monopole (« ½) to hyper-cardioid response (« ½ ). For analyzing this zoom example, we will look at the directivityfactor É given by [2] [4]:…”

Section: Standard Acoustic Zoomingmentioning

confidence: 99%

“…Throughout this paper, we will focus on first-order superdirective microphones techniques [2], where we use two omnidirectional microphones in end-fire with a spacing of meters, where , with the wavelength of interest. We note however, that the techniques described in this paper are not limited to first-order superdirectivity (although it is known that a second-and higher-order superdirectivity is difficult to realize in practice when using omnidirectional microphones).…”

Section: Introductionmentioning

confidence: 99%

First-order superdirectional acoustic zooming in the presence of directional interferences

Derkx

2011

2011 Joint Workshop on Hands-Free Speech Communication and Microphone Arrays

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Acoustic zooming aims at increasing and decreasing the perceived distance of the sound-image by varying a zoom-parameter. Previously proposed superdirective acoustic zooming techniques focus on controlling the directivity-factor of the constructed beampattern by varying this zoom-parameter. As a result, these zooming techniques are only consistent in the case of (spherically) isotropic interferences. In practical situations however, often directional interferences (mainly coming from a single direction) are present. To have a consistent behaviour of the acoustic zooming, we will propose a new zooming technique that is based on a novel first-order beampattern construction. The beampattern is constructed in such a way that for every angle, the response is monotonically increasing/decreasing in a consistent way with the zooming-parameter.

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“…Due to the fact that higher-order DMAs are more sensitive to microphone mismatches and self-noise, lower-order DMAs, i.e., first-and second-order DMAs, are mostly studied in practice [2][3][4][5][6][7][8]. It is noted that the mainlobe orientation of conventional first-and second-order DMAs is fixed and non-steerable, i.e., along the array endfire direction.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of second-order steerable differential microphone arrays

Chen

2017

2017 25th European Signal Processing Conference (EUSIPCO)

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Second-order differential microphone arrays (DMAs) are one of the most commonly used DMAs in practice due to the sensitivity of higher-order DMAs to microphone mismatches and self-noise. However, conventional second-order DMAs are non-steerable with their mainlobe orientation fixed along the array endfire direction, which are not applicable to the case where sound sources may move around a large angular range. In this paper, we propose a design of second-order steerable DMAs (SOSDAs) using seven microphones. The design procedure is discussed, followed by the theoretical analysis on directivity factor and white noise gain of the proposed SOSDAs. Numerical examples are shown to demonstrate the effectiveness of the proposed design and its theoretical analysis.Index Terms-Differential microphone array, steerable beamforming, superdirective beamforming.

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A simple adaptive first-order differential microphone

Cited by 100 publications

References 1 publication

Spatial audio activity detection for hearing aids

Spatial audio activity detection for hearing aids

First-order superdirectional acoustic zooming in the presence of directional interferences

Design and analysis of second-order steerable differential microphone arrays

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