Spherical microphone array with optimal aliasing cancellation

David Lou Alon, Boaz Rafaely

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Scopus citations

Abstract

Spherical microphone arrays facilitate spatial analysis of sound fields. At the high frequencies the array performance is limited by spatial aliasing. In this paper we present a method to extend the bandwidth of the array through optimal aliasing cancellation. The advantage and novelty of the proposed method is that aliasing cancellation is achieved through signal processing without physically modifying configuration of the spherical microphone array. In this work we show that by taking into account the expected aliasing pattern with respect to the given array sampling scheme, a beamformer which suppresses the grating-lobes can be designed. This beamformer achieves a higher directivity-index at frequencies previously considered as out of the microphone array operating range, therefore increasing the overall frequency range of operation. A simulation example with a 32 elements spherical microphone array illustrate the proposed method.

Original languageEnglish
Title of host publication2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2012
DOIs
StatePublished - 1 Dec 2012
Event2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2012 - Eilat, Israel
Duration: 14 Nov 201217 Nov 2012

Publication series

Name2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2012

Conference

Conference2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2012
Country/TerritoryIsrael
CityEilat
Period14/11/1217/11/12

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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