Directivity of Spherical Polyhedron Sound Source Used in Near-Field HRTF Measurements
YU Guang-Zheng1**, XIE Bo-Sun1,2, RAO Dan1
1Acoustic Laboratory, Department of Physics, School of Science, South China University of Technology, Guangzhou 510641 2State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641
Directivity of Spherical Polyhedron Sound Source Used in Near-Field HRTF Measurements
YU Guang-Zheng1**, XIE Bo-Sun1,2, RAO Dan1
1Acoustic Laboratory, Department of Physics, School of Science, South China University of Technology, Guangzhou 510641 2State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641
摘要The omnidirectional character is one of important requirements for the sound source used in near-field head-related transfer function (HRTF) measurements. Based on the analysis on the radiation sound pressure and directivity character of various spherical polyhedron sound sources, a spherical dodecahedral sound source with radius of 0.035 m is proposed and manufactured. Theoretical and measured results indicate that the sound source is approximately omnidirectional below the frequency of 8 kHz. In addition, the sound source has reasonable magnitude response from 350 Hz to 20 kHz and linear phase characteristics. Therefore, it is suitable for the near-field HRTF measurements.
Abstract：The omnidirectional character is one of important requirements for the sound source used in near-field head-related transfer function (HRTF) measurements. Based on the analysis on the radiation sound pressure and directivity character of various spherical polyhedron sound sources, a spherical dodecahedral sound source with radius of 0.035 m is proposed and manufactured. Theoretical and measured results indicate that the sound source is approximately omnidirectional below the frequency of 8 kHz. In addition, the sound source has reasonable magnitude response from 350 Hz to 20 kHz and linear phase characteristics. Therefore, it is suitable for the near-field HRTF measurements.
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2010, Vol. 27 
