Based upon the theoretical analysis of the sound field in a finite duct and the spatialsampling principle,this paper applies the adaptive filtering technique to the measurement of thesound field in the duct with the d...Based upon the theoretical analysis of the sound field in a finite duct and the spatialsampling principle,this paper applies the adaptive filtering technique to the measurement of thesound field in the duct with the distribution patterns of standing waves in the direction of thewaveguide and high—order wavefront on the cross section of the duct measured and the acousticmode theory proved by experimental results.展开更多
A hemispherical array of 196 independent loudspeakers has been constructed for laboratory research on spatial hearing, auralization, sound-field quality and spatial audio signal processing. The array of small loudspea...A hemispherical array of 196 independent loudspeakers has been constructed for laboratory research on spatial hearing, auralization, sound-field quality and spatial audio signal processing. The array of small loudspeakers is supported by a geodesic frame with a radius is 2.4 m. With this relatively high spatial density of sound sources, spatially quantized rendering of sound fields should be viable for a variety of applications, and this paper considers the potential and limits of this approach in relation to human spatial hearing capacities. The paper also considers the combined use of multiple loudspeakers for the rendering low-frequency components of sound sources in order to extend the low-frequency response of the system.展开更多
目的评估先天性小耳畸形及单侧蜗神经发育不良致单侧耳聋患者采用骨导助听器干预的效果。方法收集9名2022年9月~2023年6月在我院接受骨导助听器验配患儿的14耳资料,其中6名患儿为先天性小耳畸形,3名为单侧蜗神经发育不良致感音神经性耳...目的评估先天性小耳畸形及单侧蜗神经发育不良致单侧耳聋患者采用骨导助听器干预的效果。方法收集9名2022年9月~2023年6月在我院接受骨导助听器验配患儿的14耳资料,其中6名患儿为先天性小耳畸形,3名为单侧蜗神经发育不良致感音神经性耳聋。验配助听器前后分别进行声场纯音测听、言语空间听觉质量量表-父母版(speech,spatial,and other qualities of hearing scale for parents,SSQ-P)问卷评估。使用STATSTM 2.0统计软件分析患儿验配前后的听阈和父母问卷得分差异。结果两组患儿在验配骨导助听器前后的听阈均呈显著差异,小耳畸形组(P<0.05),单侧耳聋组(P=0.005)。两组间验配后听阈无显著差异(P=0.47)。SSQ-P父母问卷得分在短期验配后均有改善。单侧耳聋组验配后的空间听觉能力问卷得分改善弱于小耳畸形组。结论先天性小耳畸形及单侧蜗神经发育不良致单侧耳聋患儿均能从骨导助听器验配中获益,其中单侧耳聋患儿的获益低于小耳畸形患儿。展开更多
针对声辐射计量往往受测试环境、声源几何形状、材质和运动状态限制的问题,提出了一种获取特定空间内任意声源辐射声场的理论——等效场变换理论(equivalent field transformation,EFT),并得出观测空间权系数的选取标准和判别依据:当观...针对声辐射计量往往受测试环境、声源几何形状、材质和运动状态限制的问题,提出了一种获取特定空间内任意声源辐射声场的理论——等效场变换理论(equivalent field transformation,EFT),并得出观测空间权系数的选取标准和判别依据:当观测空间上的声收发合置装置在权系数的加权下,目标空间中的声场与待测点单位无指向性点源激发的声场一致时,便可通过观测空间上的观测值与权系数获得目标空间内任意声源在待测点的声场。进一步给出了EFT的在自由场、浅海环境所能测量的声场范围。通过仿真试验分别在自由场和浅水环境使用EFT获取了有限长线源的辐射声场,结果与理论值吻合。展开更多
The directivity of acoustic vector sensor (AVS) will be distorted by the sound diffraction of the AVS carrier. In this paper,the scattering of a plane acoustic wave from a prolate spheroid baffle is considered. At fir...The directivity of acoustic vector sensor (AVS) will be distorted by the sound diffraction of the AVS carrier. In this paper,the scattering of a plane acoustic wave from a prolate spheroid baffle is considered. At first,the sound diffraction of prolate spheroidal baffle is established,then the mathematical expressions of sound pressure field and particle vibration velocity field of sound diffraction are derived and the characteristic of the directivity of pressure and velocity of sound diffraction field at different frequencies and distances is analyzed. The directivity of AVS is determined by the amplitude and phase difference of diffraction wave and incident wave,which possesses a close relationship with frequency and incident angle. Finally,the calculated results are compared with the experimental results.展开更多
声场分离技术是实现非消声室环境下声源辐射特性测量的有效方法。基于球谐波分解的声场分离方法一般采用双层球面测量。在实际应用中受到测量条件的限制,高频辐射特性测量不易操作。因此,本文以二维测量代替三维测量,采用双层平面测量...声场分离技术是实现非消声室环境下声源辐射特性测量的有效方法。基于球谐波分解的声场分离方法一般采用双层球面测量。在实际应用中受到测量条件的限制,高频辐射特性测量不易操作。因此,本文以二维测量代替三维测量,采用双层平面测量计算球面采样点声压值,降低了高频测量的复杂度。数值仿真结果表明,双层平面测量对声源自由场辐射的预测误差略高于双层球面测量,但仍能给出较准确的预测结果,主瓣预测误差小于-20 d B。展开更多
文摘Based upon the theoretical analysis of the sound field in a finite duct and the spatialsampling principle,this paper applies the adaptive filtering technique to the measurement of thesound field in the duct with the distribution patterns of standing waves in the direction of thewaveguide and high—order wavefront on the cross section of the duct measured and the acousticmode theory proved by experimental results.
文摘A hemispherical array of 196 independent loudspeakers has been constructed for laboratory research on spatial hearing, auralization, sound-field quality and spatial audio signal processing. The array of small loudspeakers is supported by a geodesic frame with a radius is 2.4 m. With this relatively high spatial density of sound sources, spatially quantized rendering of sound fields should be viable for a variety of applications, and this paper considers the potential and limits of this approach in relation to human spatial hearing capacities. The paper also considers the combined use of multiple loudspeakers for the rendering low-frequency components of sound sources in order to extend the low-frequency response of the system.
文摘目的评估先天性小耳畸形及单侧蜗神经发育不良致单侧耳聋患者采用骨导助听器干预的效果。方法收集9名2022年9月~2023年6月在我院接受骨导助听器验配患儿的14耳资料,其中6名患儿为先天性小耳畸形,3名为单侧蜗神经发育不良致感音神经性耳聋。验配助听器前后分别进行声场纯音测听、言语空间听觉质量量表-父母版(speech,spatial,and other qualities of hearing scale for parents,SSQ-P)问卷评估。使用STATSTM 2.0统计软件分析患儿验配前后的听阈和父母问卷得分差异。结果两组患儿在验配骨导助听器前后的听阈均呈显著差异,小耳畸形组(P<0.05),单侧耳聋组(P=0.005)。两组间验配后听阈无显著差异(P=0.47)。SSQ-P父母问卷得分在短期验配后均有改善。单侧耳聋组验配后的空间听觉能力问卷得分改善弱于小耳畸形组。结论先天性小耳畸形及单侧蜗神经发育不良致单侧耳聋患儿均能从骨导助听器验配中获益,其中单侧耳聋患儿的获益低于小耳畸形患儿。
文摘针对声辐射计量往往受测试环境、声源几何形状、材质和运动状态限制的问题,提出了一种获取特定空间内任意声源辐射声场的理论——等效场变换理论(equivalent field transformation,EFT),并得出观测空间权系数的选取标准和判别依据:当观测空间上的声收发合置装置在权系数的加权下,目标空间中的声场与待测点单位无指向性点源激发的声场一致时,便可通过观测空间上的观测值与权系数获得目标空间内任意声源在待测点的声场。进一步给出了EFT的在自由场、浅海环境所能测量的声场范围。通过仿真试验分别在自由场和浅水环境使用EFT获取了有限长线源的辐射声场,结果与理论值吻合。
文摘The directivity of acoustic vector sensor (AVS) will be distorted by the sound diffraction of the AVS carrier. In this paper,the scattering of a plane acoustic wave from a prolate spheroid baffle is considered. At first,the sound diffraction of prolate spheroidal baffle is established,then the mathematical expressions of sound pressure field and particle vibration velocity field of sound diffraction are derived and the characteristic of the directivity of pressure and velocity of sound diffraction field at different frequencies and distances is analyzed. The directivity of AVS is determined by the amplitude and phase difference of diffraction wave and incident wave,which possesses a close relationship with frequency and incident angle. Finally,the calculated results are compared with the experimental results.
文摘声场分离技术是实现非消声室环境下声源辐射特性测量的有效方法。基于球谐波分解的声场分离方法一般采用双层球面测量。在实际应用中受到测量条件的限制,高频辐射特性测量不易操作。因此,本文以二维测量代替三维测量,采用双层平面测量计算球面采样点声压值,降低了高频测量的复杂度。数值仿真结果表明,双层平面测量对声源自由场辐射的预测误差略高于双层球面测量,但仍能给出较准确的预测结果,主瓣预测误差小于-20 d B。
