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Time domain wave separation using multiple microphones.

Jonathan A Kemp1, Maarten van Walstijn, D Murray Campbell

  • 1School of Physics, University of Edinburgh, Room 4306, JCMB, Edinburgh EH9 3JZ, United Kingdom. j.a.kemp@ed.ac.uk

The Journal of the Acoustical Society of America
|July 24, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a novel multiple microphone reflectometry technique for measuring acoustic behavior in tubular systems. This method accurately separates acoustic waves, enabling precise analysis of system properties like bore profile and impedance.

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Area of Science:

  • Acoustics
  • Mechanical Engineering
  • Signal Processing

Background:

  • Traditional acoustic measurements in tubular systems use steady-state or reflectometry methods.
  • Reflectometry typically separates forward and backward waves using causality.
  • Existing methods may not fully account for signal losses or gain variations.

Purpose of the Study:

  • To present a multiple microphone reflectometry technique for acoustic wave separation in tubular systems.
  • To enable accurate measurement of wave separation, bore profile, and input impedance.
  • To improve upon existing time and frequency domain acoustic measurement methods.

Main Methods:

  • Utilizes time domain convolution with multiple microphones to track acoustic waves.
  • Employs two calibration runs to measure time domain transfer functions between microphone pairs.
  • Incorporates time delay, frequency-dependent losses, and microphone gain ratios into the analysis.

Main Results:

  • Successfully separates forward and backward acoustic waves in a cylindrical source tube.
  • Demonstrates the application of the technique for measuring bore profile and input impedance.
  • Provides a more comprehensive analysis by including inter-microphone transfer function effects.

Conclusions:

  • The developed multiple microphone reflectometry technique offers an advanced approach to acoustic analysis in tubular systems.
  • This method enhances accuracy by integrating wave separation with detailed transfer function characteristics.
  • The technique provides a valuable tool for understanding and characterizing acoustic behavior in ducts and tubes.