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Theoretical and experimental analysis of the diffuseness in room sound fields

室内声场扩散的理论和实验分析

基本信息

批准号：
298797807
负责人：
Professor Dr. Michael Vorländer
金额：
--
依托单位：
Lehrstuhl und Institut für Hörtechnik und Akustik (IHTA)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/298797807?language=en
关键词：
Theoretical experimental analysis diffuseness room

项目摘要

Room impulse responses have an extremely complicated fine structure as concerns temporal and spatial features. In applied acoustics, therefore, often the idea of a diffuse field is used. The theoretical concept of the diffuse field plays a very important role in room acoustics and in acoustic measurements in reverberation chambers. The objective in this project is the definition and experimental validation of a metric for characterization of the diffuseness at receiver positions in a room sound field in the sense of isotropy of incoherent sound waves and of decay curves. Parts of this project are arranged in collaboration with three partners (Rostock University, IRCAM Paris, and DTU Copenhagen). This proposal leads to the extension of knowledge by evaluating the Plane Wave Distributions in room sound fields depending on temporal and spectral filter approaches, by comparing efficient array signal processing methods, by exploration of the potential of the known spatial signal processing methods and extension towards spatial decomposition of Schroeder decay curves. Finally, the diffuseness metric for reverberation room qualification and calibration will be tested with statistical models in slightly varied source and microphone positioning (error sensitivity analysis) with the focus on measurement of absorption coefficients. In order to identify practical aspects such as the influence of the required spatial resolution and the (dodecahedron) loudspeaker directivity in such measurements, a high-order experimental system for MIMO (array-to-array) room impulse response measurement will be used. The results are relevant for array signal processing as well as for room acoustics in general, and for standard absorption measurements in particular.

房间脉冲响应具有极其复杂的时间和空间特征的精细结构。因此，在应用声学中，通常使用漫射场的概念。扩散场的理论概念在室内声学和混响室的声学测量中起着非常重要的作用。本项目的目标是定义和实验验证一种度量，用于从非相干声波和衰减曲线的各向同性意义上表征房间声场中接收器位置的扩散。该项目的部分内容是与三个合作伙伴(罗斯托克大学、巴黎IRCAM和DTU哥本哈根)合作安排的。通过比较有效的阵列信号处理方法，通过探索已知空间信号处理方法的潜力，通过扩展Schroeder衰减曲线的空间分解，该建议通过评估依赖于时间和频谱滤波方法的房间声场中的平面波分布来导致知识的扩展。最后，混响室鉴定和校准的扩散度指标将在稍有变化的声源和传声器位置(误差敏感度分析)下使用统计模型进行测试，重点是测量吸收系数。为了确定在这种测量中所需的空间分辨率和(十二面体)扬声器指向性等实际方面的影响，将使用用于MIMO(阵列到阵列)房间脉冲响应测量的高阶实验系统。这些结果对于阵列信号处理以及一般的房间声学，特别是标准的吸收测量都是相关的。