The Journal of the Acoustical Society of Korea

The Acoustical Society of Korea (한국음향학회)
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Comparison of Sound Source Localization Methods Based on Zero Crossings

  • Park, Yong-Jin (Department of Electronic Engineering, Sogang University) ;
  • Lee, Soo-Yeon (Department of Electronic Engineering, Sogang University) ;
  • Park, Hyung-Min (Department of Electronic Engineering, Sogang University)
  • Published : 2009.09.30
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Abstract

This paper reviews several multi-source localization methods which estimate ITDs based on zero crossings (ZCs). Employing signal-to-noise ratio (SNR) estimation from ITD variances, these ZC-based source localization methods are more robust to diffuse noise than the cross-correlation (CC)-based one with less computational complexity. In order to take reverberant environments into account, two approaches detect intervals which dominantly contain direct-path components from sources to sensors because they may effectively provide reliable ITDDs corresponding to source directions. One accomplishes the detection by comparing the original and cepstral-prefiltering-processed envelopes, and the other searches sudden increase of acoustic energy by considering typical characteristics of acoustic reverberation. Experiments for comparison of these methods demonstrate that the approach with energy-based detection efficiently achieves multi-source localization in reverberant environments.

Keywords

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