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可听化工具基于对房间几何形状、反射和散射特性以及波的影响(如绕射和模式)的几个简化。以前的研究和正在进行的研究表明，如果遵循某些程序，这些简化可以被认为是听不见的。然而，所有这些指导方针都取决于实施情况、所选的房间实例和用于可听化的信号。除了基于物理的模拟之外，基于同时掩蔽的感知剔除允许控制可听化策略以将性能保持在实时处理的限制内。目前尚不清楚模拟参数如何在不同的维度(响度、音色、宽敞、清晰度等)影响室内声学的感知。这方面的模拟参数包括：CAD房间模型中的细节程度，吸收和散射模型中的不确定性，从早期精确镜面反射模型到统计反射模型在时间和空间分辨率上的转变顺序，晚混响(辐射度，漫射雨，形状噪声)及其统计参数(粒子数量，面片大小等)的实现(方言)，HRTF数据库的不确定性的作用和震源记录技术。实际研究项目集中在交互式VR系统的实时实现和研究以及大型房间的CAD建模。本研究股的做法是对以前工作的合理延续。以前的工作还包括对混响滤波器设计参数的初步研究，这些研究表明，基于AFC的听力测试策略可以很好地利用心理测量函数来测量模拟伪像的听阈。然而，测试条件(仅限音频、视听、视听和任务)和心理声学测试在其再现质量和测试对象的选择和指导方面是项目的关键部分。这个子项目的目标是确定关于模拟参数及其在空间和时间域中的限制的感知检测能力和可区分性。申请人已开发的现有算法应使用心理声学认可的方法进行应用和测试，以确定关于房间声学感知的各个维度的感知阈值和环境模拟参数的影响。