Adaptive calibration of a three-microphone system for acoustic waveguide characterization under time-varying conditions

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      The pressure and velocity field in a one-dimensional acoustic waveguide can be sensed in a non-intrusive manner using spatially distributed microphones. Experimental characterization with sensor arrangements of this type has many applications in measurement and control. This paper presents a method for measuring the acoustic variables in a duct under fluctuating propagation conditions with specific focus on in-system calibration and tracking of the system parameters of a three-microphone measurement configuration. The tractability of the non-linear optimization problem that results from taking a parametric approach is investigated alongside the influence of extraneous measurement noise on the parameter estimates. The validity and accuracy of the method are experimentally assessed in terms of the ability of the calibrated system to separate the propagating waves under controlled conditions. The tracking performance is tested through measurements with a time-varying mean flow, including an experiment conducted under propagation conditions similar to those in a wind instrument during playing.

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      • Adaptive calibration of a three-microphone system for acoustic waveguide characterization under time-varying conditions

        Rights statement: Copyright (2014) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in Walstijn, M. V., & Sanctis, G. D. (2014). Adaptive calibration of a three-microphone system for acoustic waveguide characterization under time-varying conditions. Journal of the Acoustical Society of America, 135(2), 917-927 and may be found at http://dx.doi.org/10.1121/1.4861250

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      DOI

      Original languageEnglish
      Number of pages11
      Pages (from-to)917-927
      JournalJournal of the Acoustical Society of America
      Journal publication date2014
      Issue number2
      Volume135
      DOIs
      StatePublished - 2014

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      ID: 8982398