Determination of boundary conditions by inverse modeling of room acoustics

通过室内声学逆向建模确定边界条件

• 批准号: 192379851
• 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 Units
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/192379851?language=en
• 关键词: Determination; boundary; conditions; inverse; modeling

Room acoustic simulation algorithms and auralization tools are based on several simplifications concerning the room geometry, the reflection and scattering properties and the wave effects such as diffraction and modes. Previous studies and ongoing research have shown that these simplifications can be considered inaudible, if certain procedures are followed. All those guidelines, however, depend on the Implementation, on the room example chosen and on the signal used for auralization. Apart from physically-based simulation, perceptual culling based on simultaneous masking allows control of auralization strategies for keeping the performance in the limits of real-time processing. It is not yet known quantitatively, how the simulation parameters influence the perception of room acoustics In its various dimensions (loudness, timbre, spaciousness, clarity, etc.). Simulation parameters in this respect are: degree of details in the CAD room model, the uncertainty in absorption and scattering models, the transition order from early exact specular to statistic reflection models in temporal and spatial resolution, the implementation ("dialect") of late reverberation (radiosity, diffuse rain, shaped noise) and its statistical parameters (number of particles, patch sizes, etc.), the role of uncertainty of HRTF databases and source recording techniques.Previous work of the applicant was focused on hybrid geometric modeling, better surface modelling, hybrid geometric-wave modeling and round robin tests. Actual research projects are focused on real-time Implementation and studies of interactive VR systems and on CAD modelling of large rooms. The approach In this Research Unit is the logical continuation of previous work. Previous work also included preliminary studies of the parameters In reverberation filter design These studies showed that AFC based listening test strategies are well qualified to measure audibility thresholds of simulation artifacts by means of psychometric functions. Nevertheless the test conditions (only audio, audio and vision, audio and vision and task) and the psychoacoustic test in its reproduction quality and test subject selection and instruction Is a crucial part of the project. The goal of this subproject Is to determine the perceptual detection ability and differentiability, with respect to the simulation parameters and their limits in spatial and temporal domains. Existing algorithms that have been developed by the applicant should be applied and tested with psycho-acoustically approved methods, to ascertain perceptual thresholds regarding various dimensions of room acoustics perception and the impact of environmental simulation parameters.

房间声学模拟算法和听觉工具基于有关房间几何形状，反射和散射特性以及波浪效应（例如衍射和模式）的几种简化。先前的研究和正在进行的研究表明，如果遵循某些程序，这些简化可以认为是听不清的。但是，所有这些准则都取决于实施，在选择的房间示例以及用于听觉化的信号上。除了基于物理的仿真外，基于同时掩盖的感知剔除允许控制听觉策略，以使性能保持在实时处理的范围内。 尚不清楚它在各种维度（响度，音色，宽敞，清晰度等）中如何影响仿真参数如何影响房间声学的感知。在这方面数据库和源记录技术。申请人的预防工作集中于混合几何建模，更好的表面建模，混合几何波浪建模和循环rolloin测试。实际的研究项目侧重于实时实施和对交互式VR系统的研究以及大房间的CAD建模。该研究单位的方法是以前工作的逻辑延续。先前的工作还包括对混响过滤器设计中参数的初步研究，这些研究表明，基于AFC的听力测试策略有资格通过心理测量功能来衡量模拟伪像的可听性阈值。然而，测试条件（只有音频，音频和视觉，音频，视觉以及任务）以及在其繁殖质量和测试主题选择和指导中进行的心理声学测试是项目的重要组成部分。 该子项目的目的是确定相对于空间和时间域中的仿真参数及其限制的感知检测能力和可怜性。申请人已经开发的现有算法应使用心理批准的方法应用和测试，以确定有关房间声学知觉各个方面的感知阈值以及环境模拟参数的影响。