耳廓旋转角的测量结果与头部初始位置有关,不同的耳廓旋转角测量方法可能影响个性化头相关传输函数(HRTF)的仰角分布特性.文中分别采用面部垂直参考面和法兰克福水平参考面测量并比较了60名受试者的耳廓旋转角,发现两种方法所得均值相差...耳廓旋转角的测量结果与头部初始位置有关,不同的耳廓旋转角测量方法可能影响个性化头相关传输函数(HRTF)的仰角分布特性.文中分别采用面部垂直参考面和法兰克福水平参考面测量并比较了60名受试者的耳廓旋转角,发现两种方法所得均值相差5°左右.为了分析耳廓旋转角对个性化HRTF空间分布的影响,将一个左耳廓在同一个椭球上按5°间隔旋转,得到耳廓旋转角分别为16°、11°和6°的3个计算模型.然后,用快速多极边界元方法(FM-BEM)计算分析了3个耦合模型的HRTF数据.结果表明:不同耳廓旋转角条件下,HRTF的耳廓高频谷点的频率差异可以达到约1.0 k Hz,某些角度的谷点幅度差异可达到约10 d B.最后,用空间坐标变换方法定制不同耳廓旋转角的个性化HRTF,结果表明,定制HRTF的耳廓谷点频率和幅度与直接通过数值计算的HRTF基本吻合,证明个性化耳廓旋转角定制方法有效.展开更多
A simple spherical bead and pulsating spherical sound source model are proposed to investigate the effect of multiple scattering between the head and the sound source on near-field head-related transfer function （HRT...A simple spherical bead and pulsating spherical sound source model are proposed to investigate the effect of multiple scattering between the head and the sound source on near-field head-related transfer function （HRTF） measurement. Multipole expansion method is used to calculate HRTFs of the model, then the relationships among the magnitude error of HRTF with frequency, source direction, source size, and the distance between the head centre and the sound source are analysed. The results show that to ensure the magnitude error of HRTF within 1.0dB up to 20kHz, for source distance not less than 0.15m or 0.20m, the radius of the sound source should not exceed 0.03 m or 0.05 m, respectively. The conclusion suggests an appropriate size of sound source in near-field HRTF measurement.展开更多
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 d...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 O. 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 350Hz to 20 kHz and linear phase characteristics. Therefore, it is suitable for the near-field HRTF measurements.展开更多
To evaluate the overall effect of the neck and torso on the head-related transfer function(HRTF),a simplified head-neck-torso(HNT)model,which consists of a spherical head,spherical torso and cylindrical neck,is propos...To evaluate the overall effect of the neck and torso on the head-related transfer function(HRTF),a simplified head-neck-torso(HNT)model,which consists of a spherical head,spherical torso and cylindrical neck,is proposed and the corresponding HRTFs are calculated using the boundary element method(BEM).The results indicate that the HRTF magnitudes for the HNT model are different from those of the existing spherical head-and-torso model(HAT)above 0.5 kHz,especially in the near-field and contralateral region.The discrepancy in the HRTF magnitudes leads to a discrepancy in the interaural level differences(ILDs)for the HNT and HAT models,which reaches a level of-l0dB at source distance of 0.2m.As the source distance increases,the discrepancy in the results of the HNT and HAT models reduces.Measurement on practical HNT and HAT models validates the analysis.Therefore,the neck influences near-field HRTFs and should be included in the near-field HRTF calculation.展开更多
文摘耳廓旋转角的测量结果与头部初始位置有关,不同的耳廓旋转角测量方法可能影响个性化头相关传输函数(HRTF)的仰角分布特性.文中分别采用面部垂直参考面和法兰克福水平参考面测量并比较了60名受试者的耳廓旋转角,发现两种方法所得均值相差5°左右.为了分析耳廓旋转角对个性化HRTF空间分布的影响,将一个左耳廓在同一个椭球上按5°间隔旋转,得到耳廓旋转角分别为16°、11°和6°的3个计算模型.然后,用快速多极边界元方法(FM-BEM)计算分析了3个耦合模型的HRTF数据.结果表明:不同耳廓旋转角条件下,HRTF的耳廓高频谷点的频率差异可以达到约1.0 k Hz,某些角度的谷点幅度差异可达到约10 d B.最后,用空间坐标变换方法定制不同耳廓旋转角的个性化HRTF,结果表明,定制HRTF的耳廓谷点频率和幅度与直接通过数值计算的HRTF基本吻合,证明个性化耳廓旋转角定制方法有效.
基金Supported by the National Natural Science Foundation of China under Grant No 10774049.
文摘A simple spherical bead and pulsating spherical sound source model are proposed to investigate the effect of multiple scattering between the head and the sound source on near-field head-related transfer function （HRTF） measurement. Multipole expansion method is used to calculate HRTFs of the model, then the relationships among the magnitude error of HRTF with frequency, source direction, source size, and the distance between the head centre and the sound source are analysed. The results show that to ensure the magnitude error of HRTF within 1.0dB up to 20kHz, for source distance not less than 0.15m or 0.20m, the radius of the sound source should not exceed 0.03 m or 0.05 m, respectively. The conclusion suggests an appropriate size of sound source in near-field HRTF measurement.
基金Supported by the National Natural Science Foundation of China under Grant No 10774049, State Key Lab of Subtropical Building Science, South China University of Technology, and Guangdong Natural Science Foundation of China （Dr Startup Items）
文摘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 O. 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 350Hz to 20 kHz and linear phase characteristics. Therefore, it is suitable for the near-field HRTF measurements.
基金Supported by the National Natural Science Foundation of China for Young Scholars(No 11104082)the Natural Science Foundation of Guangdong Province(No x2lxB6100320)+1 种基金the Foundation for Distinguished Young Talents in Higher Education of Guangdong Province(FDYT,No LYM10012)the Fundamental Research Funds for the Central Universities(No 2011ZM0092).
文摘To evaluate the overall effect of the neck and torso on the head-related transfer function(HRTF),a simplified head-neck-torso(HNT)model,which consists of a spherical head,spherical torso and cylindrical neck,is proposed and the corresponding HRTFs are calculated using the boundary element method(BEM).The results indicate that the HRTF magnitudes for the HNT model are different from those of the existing spherical head-and-torso model(HAT)above 0.5 kHz,especially in the near-field and contralateral region.The discrepancy in the HRTF magnitudes leads to a discrepancy in the interaural level differences(ILDs)for the HNT and HAT models,which reaches a level of-l0dB at source distance of 0.2m.As the source distance increases,the discrepancy in the results of the HNT and HAT models reduces.Measurement on practical HNT and HAT models validates the analysis.Therefore,the neck influences near-field HRTFs and should be included in the near-field HRTF calculation.
