University of Illinois Urbana-Champaign

Characterization of the head-related transfer function using chirp and maximum length sequence excitation signals

Tidemann, Jeremy A.

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https://hdl.handle.net/2142/24345

Description

Title
Characterization of the head-related transfer function using chirp and maximum length sequence excitation signals
Author(s)
Tidemann, Jeremy A.
Issue Date
2011-05-25T15:09:05Z
Director of Research (if dissertation) or Advisor (if thesis)
Hasegawa-Johnson, Mark A.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
  • Head-Related Transfer Function (HRTF)
  • Knowles electronic manikin for acoustic research (KEMAR)
  • maximum length sequence (MLS)
  • maximum length sequence
  • Head-related Impulse Response (HRIR)
  • chirp
  • sweep
  • excitation signal
  • impulse response
  • auditory system
  • sound localization
  • system characterization
  • localization
  • virtual reality
  • probe microphone
  • synchronization
  • perception of sound
  • 3D hearing
  • 3D sound
Abstract
Both chirp (or sweep) and maximum length sequence (MLS) excitation signals are used to obtain measurements of the head-related transfer function (HRTF) for the Knowles electronic manikin for acoustic research (KEMAR), resulting in remarkably low relative error between the two measurement methods. Due to the low relative error, it is asserted that applying both methods in experiments involving system characterization can be used to confirm the accuracy of individual measurements and reduce the likelihood that erroneous measurements go unnoticed. An MLS burst-augmented excitation signal is presented to compensate for unpredictable delay added in sound-acquisition software that lacks the capability of synchronized record/playback. The HRTF measurements obtained with an external probe microphone are compared with those obtained with the standard in-ear microphones that the KEMAR is equipped with, to reveal that care should be taken to select a probe microphone that has a low susceptibility to multipath interference. An experiment is performed to investigate the feasibility of using two pre-filtered chirp responses to obtain the relative transfer function between the two locations of measurement.
Graduation Semester
2011-05
Permalink
http://hdl.handle.net/2142/24345
Copyright and License Information
Copyright 2011 Jeremy A. Tidemann

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