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Establishment and Analysis of Head-related Transfer Functions Database with High Spatial Resolution

Author: ZhongQiZhu
Tutor: XieBoZuo；YuGuangZheng
School: South China University of Technology
Course: Acoustics
Keywords: head-related transfer function spatial resolution measurement interpolation error
CLC: TN912.3
Type: Master's thesis
Year: 2011
Downloads: 29
Quote: 1
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Abstract


Head-related Transfer Functions (HRTFs) are continuous functions about the sound source directions (azimuths and elevations), distances, frequencies etc. Measurement is the most accurate and common method to obtain HRTF. However, HRTFs only in finite number of discrete directions can be measured. It is impossible to measure HRTFs in continuous directions of space. The unmeasured HRTFs can be obtained by spatial interpolation. The errors always exist between the HRTFs obtained by spatial interpolation and the original ones, which can be reduced by increasing the spatial resolution of measured HRTFs. In practice, the HRTFs with certain spatial resolution can satisfy the requirements of applications. But as a baseline data (just like the standard scientific measurement) that is used to analyze and validate the accuracy of HRTFs data, the HRTFs database with high spatial resolution is necessary. However, the measurement of high spatial resolution HRTFs has strictly reqirements of experimental conditions including the parameters of sound source and its localization accuracy, which in some existing HRTFs measurements could not be satisfied.Therefore, the experimental conditions of HRTFs with high spatial resolution are firstly realized in this paper. It includes that a sound soruce that is suitable for the measurement has been designed, and the parameters of sound source have been analyzed by theoretical calculation and experimental measurement. The experimental program has been eveloped and the feasible localization system of sound source has been built as the features of high spatial resolution HRTFs measurement. The FASTRAK electromagnetic pursuing tracer is used to calibrate and evaluate the accuracy of sound source localization system.The HRTFs database with high spatial resolution of KEMAR mannequin is established by using the measurement system and the reproducibility and experimental errors are analyzed. Then, the characteristics of HRTFs in frequency domain and time domain are analyzed, and the localization information such as the interaural time difference (ITD) and interaural level difference (ILD) are also investigated. At last, under the conditions of existing spatial sampling resolution, the spatial azimuth resolution of HRTFs is analyzed by using the spatial sampling theorem. The interpolation and error analysis of HRTFs have been analyzed, which include the error distribution in interpolation range, and the variations of interpolation errors under conditions of different azimuth intervals and latitudes.The results show that the characteristics of small sound source meet requirements of the experimental measurement. The localization system of sound source basically satisfies the requirements of high spatial resolution HRTFs measurement, and the repeatability is good. The azimuthal resolutions at all elevations are enough, which can be used as the baseline database of HRTFs and provides important data basis for the related researches.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Electro-acoustic technology and speech signal processing > Speech Signal Processing
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