HRTF Measurement on a KEMAR Manikin

Mengqiu (Karan) Zhang (Australian National University)

DATE: 2009-11-19
TIME: 11:00:00 - 12:00:00
LOCATION: RSISE Seminar Room, ground floor, building 115, cnr. North and Daley Roads, ANU

ABSTRACT:
Presenting sounds to humans in virtual environments requires convolving the free field signals with a head related transfer function (HRTF), which is a frequency response describing the filtering effects of the pinna, head and torso of a human. Sets of HRTFs are usually measured on the dummy head or human subjects at different directions in an anechoic room. This paper describes the details of an experimental HRTF measurement procedure with emphasis on the design of the test signal and the post-processing to extract HRTFs. We construct a pre-emphasized logarithmic sweep as the excitation signal which separates the nonlinear and time variant distortions from the main desired response. For the received raw data, a series of signal processing techniques are applied to determine the timing offset when the head response begins, to mitigate room reverberation, and to equalize the HRTF measurements. One of the goals of this paper is to provide details of the experimental setup. Also, we intend to publish our processed measurements in the form of a HRTF data base as a resource for the acoustic community.

BIO:
Mengqiu Zhang received the Master of Engineering degree in Instrument and Measurement from Xidian University, China, in 2006, and the Bachelor of Engineering degree in Wireless Test & Measurement from China Jiliang University, China, in 1994. She is currently working toward the Ph.D. degree at the Research School of Information Sciences and Engineering, the Australian National University. Previously, she worked for Huizhou Institute of Test and Measurement as a senior electronic engineer. Her research interests are HRTF (Head-related transfer function) measurement and modelling and spatial audio signal processing techniques.

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