Patent
Optimal modal beamformer for sensor arrays
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TLDR
In this article, a method of forming a beampattern in a beamformer of the type in which the beamformer receives input signals from a sensor array, decomposes the input signals into the spherical harmonics domain, applies weighting coefficients to the spherical harmonic and combines them to form an output signal, wherein the weighting coefficient are optimized for a given set of input parameters by convex optimization.Abstract:
A method of forming a beampattern in a beamformer of the type in which the beamformer receives input signals from a sensor array, decomposes the input signals into the spherical harmonics domain, applies weighting coefficients to the spherical harmonics and combines them to form an output signal, wherein the weighting coefficients are optimized for a given set of input parameters by convex optimization. Formulations are provided for forming second order cone programming constraints for multiple main lobe generation, uniform and non-uniform side lobe control, automatic null steering, robustness and white noise gain.read more
Citations
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References
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Proceedings ArticleDOI
A highly scalable spherical microphone array based on an orthonormal decomposition of the soundfield
Jens Meyer,Gary W. Elko +1 more
TL;DR: This paper describes a beamforming microphone array consisting of pressure microphones that are mounted on the surface of a rigid sphere based on a spherical harmonic decomposition of the soundfield that allows a simple and computationally effective, yet flexible beamformer structure.
Journal ArticleDOI
Flexible and Optimal Design of Spherical Microphone Arrays for Beamforming
Zhiyun Li,Ramani Duraiswami +1 more
TL;DR: The approach presented, a spherical microphone array can have very flexible layouts of microphones on the spherical surface, yet optimally approximate a desired beampattern of higher order within a specified robustness constraint, is described.
Journal ArticleDOI
Phase-mode versus delay-and-sum spherical microphone array processing
TL;DR: The spherical harmonic framework is employed to compare the well-known delay-and-sum to the phase-mode processing for spherical arrays to show similar performance at frequencies where the upper spherical harmonic order equals the product of the wave number and sphere radius.
Journal ArticleDOI
Partial adaptivity for the large array
TL;DR: This paper examines the problem of configuring such a large array to provide partial adaptivity and the results of simulations and analysis are presented showing the effects of configuration, the effect of practical component tolerances, and the transient response characteristics of several candidate systems.
Journal ArticleDOI
Optimal array pattern synthesis for broadband arrays.
TL;DR: A broadband array pattern synthesis approach to designing time-domain constant mainlobe response beamformer with real-time response variation over frequency is proposed and several optimization criteria are presented and the corresponding convex second-order cone programming implementations are given.