Vol.53, No.4, 2019, pp.151-159, doi:10.32604/sv.2019.04644
OPEN ACCESS
ARTICLE
Multiple Scattering Between Adjacent Sound Sources in Head-Related Transfer Function Measurement System
  • Guangzheng Yu1,*, Yu Liu1,2, Bosun Xie1, Huali Zhou1
1 Acoustic Lab., School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510641, China.
2 GAC R&D Center, Guangzhou Automobile Group Co., Ltd., Guangzhou, 511458, China.
* Corresponding Author: Guangzheng Yu. Email: scgzyu@scut.edu.cn.
Abstract
To accelerate head-related transfer functions (HRTFs) measurement, two or more independent sound sources are usually employed in the measurement system. However, the multiple scattering between adjacent sound sources may influence the accuracy of measurement. On the other hand, the directivity of sound source could induce measurement error. Therefore, a model consisting of two spherical sound sources with approximate omni-directivity and a rigid-spherical head is proposed to evaluate the errors in HRTF measurement caused by multiple scattering between sources. An example of analysis using multipole re-expansion indicates that the error of ipsilateral HRTFs are within the bound of ± 1.0 dB below a frequency of 20 kHz, provided that the sound source radius does not exceed 0.025 m, the source distance relative to head center is not less than 0.5 m, and the angular interval between two adjacent sources is not less than 20 degrees. Similar conclusions under different conditions can also be analyzed and discussed by using this calculation method. Furthermore, the results are verified by measurements of HRTFs for a rigid sphere and a KEMAR artificial head.
Keywords
Head-related transfer function; near field; measurement error; multiple scattering
Cite This Article
Yu, G., Liu, Y., Xie, B., Zhou, H. (2019). Multiple Scattering Between Adjacent Sound Sources in Head-Related Transfer Function Measurement System. Sound & Vibration, 53(4), 151–159.