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Title:Characterization of the head-related transfer function using chirp and maximum length sequence excitation signals
Author(s):Tidemann, Jeremy A.
Advisor(s):Hasegawa-Johnson, Mark A.
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(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)
excitation signal
impulse response
auditory system
sound localization
system characterization
virtual reality
probe microphone
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.
Issue Date:2011-05-25
Rights Information:Copyright 2011 Jeremy A. Tidemann
Date Available in IDEALS:2011-05-25
Date Deposited:2011-05

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