全数字化小尺度封闭空间音质评价方法研究(一) 主观评价方法  

Study of Full Digital Sound Quality Evaluation in Small Enclosures PartⅠ:Subjective Evaluation of Sound Quality

作　　者：宁方立[1] 韦敏[1] 

机构地区：[1]西北工业大学机电学院,陕西西安710072

出　　处：《电声技术》2004年第4期7-11,共5页Audio Engineering

基　　金：国家自然科学基金资助项目19870405.;西北工业大学青年科技创新基金资助项目.

摘　　要：在小尺度封闭空间内,声波低频成分的波长与空间尺寸相当,声音在传播过程中所发生的散射、衍射等波动现象不容忽视。目前以几何声学为理论基础的音质评价方法无法直接用于小尺度封闭空间中,需要发展以波动声学为理论基础的音质评价方法。以室内声场有源Helmholtz方程及其相应边界方程为基础,分别研究基于计算机辅助的全数字化小尺度封闭空间主观音质评价及客观音质评价方法。在这一部分,首先推导了求解小尺度封闭空间低频声传递函数的有限元模型;并进一步研究了在小尺度封闭空间内的双耳特性的处理方法;最后给出了小尺度封闭空间可听化的软件实现方法,并在一车体模型内实现了可听化。Because of wavelength of sound at low frequencies being close to the dimensions of small enclosures,scattering and diffraction in the course of sound radiation can not be ignored.As a result,sound quality assess-ment based on geometrical acoustics can not be applied in small enclosures.In this paper,based on Helmholtz e-quation and its boundary equations,full digital subjective and objective sound quality assessments for small enclo-sures are studied respectively.In this part,subjective sound quality assessment is studied.Firstly,the model of Finite Element Method(FEM)is given for computing low frequency sound transfer function in small enclosures.Secondly,processing method for binaural characteristic is put forward.Finally,detailed steps for the realization of auralization software in small enclosures are presented.As an example,the auralization is realized in a car cavity.[

关 键 词：主观音质评价 小尺度封闭空间 有限元 几何声学 室内声学音质评价 

分 类 号：TU112.2[建筑科学—建筑理论]