Room Acoustics Prediction and Auralisation: Verification and Testing of New Methods in Room Acoustics Modelling.

室内声学预测和可听化：室内声学建模新方法的验证和测试。

• 批准号: EP/J000108/1
• 负责人: Damian Murphy
• 金额: $ 3.15万
• 依托单位: University of York
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2012
• 资助国家: 英国
• 起止时间: 2012 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FJ000108%2F1
• 关键词: Room; Acoustics; Prediction; Auralisation; Verification

Room acoustics simulation - modelling acoustic wave propagation within an enclosed space - is one of the fundamental applications of audio signal processing. Given pre-defined sound-source/listener locations and a surrounding geometry the resulting room impulse response (RIR) of the system can be found. Convolution with this RIR allows any audio signal to be placed in the room at the source location and auditioned by a listener placed at the receiver location. Essentially this allows any sound source to be heard within any room.There are three main applications for this technology:(1) Reverberation simulation in music production: all music is composed to be heard in a reverberant environment, whether a concert hall or an algorithm designed to simulate an optimal reverberant field.(2) Architectural Acoustics: where a building is simulated and auditioned before construction/renovation to determine the resulting acoustic quality and identify any changes that might be appropriate.(3) Virtual environment modelling: e.g. computer games, virtual reality applications and film/television postproduction, where various sound-sources are placed in and around a virtual environment with the potential for allowing interaction with the space.Although research at both York and Aalto encompasses standard room acoustics simulation methods based on geometric acoustic techniques (where sound is assumed to behave as a ray of light with the associated limitations involved with making such an assumption) most of our interests and efforts are focused on approaches that solve the acoustic wave equation directly, that therefore offer the potential for a full, complete and accurate simulation of the soundfield within an enclosed space. Recent research has included optimal grid-sampling schemes, frequency dependent diffusing boundaries, spatial encoding for receivers and source excitation strategies. Directional source encoding and real-time auralisation have also been explored, taking the best aspects of wave based and geometric approaches, and offering significant and real potential for both further research and commercial exploitation.Hence, solutions now exist for the main constituent features of any simulation - source excitation and directivity, wave propagation, boundary interaction, and receiver encoding. This is coupled with new modelling methods and the possibility of using Graphical Processing Units to speed up calculation times. Much of this work to date has been validated using simple, easy to measure objective metrics such as room mode analysis, reverberation time, polar directivity plots, boundary characteristics, etc. It therefore now seems appropriate to tackle more demanding simulations with a view to validating this approach for a broader range of problems. A number of options will be explored including simple, analytically trivial shoebox-shaped rooms, previously published data that formed the basis for a round robin study on room acoustics measurement and simulation, as well as the study of new, complex spaces based on their direct measurement, both physical and acoustic.The aim of this visit is to facilitate a benchmark study in the use and testing of new room acoustic prediction and auralisation methods for a number of specific ideal and real-world scenarios. This therefore leads to the following objectives: (1) Consolidation of code into an appropriate framework for carrying out this benchmark study; (2) design, carry out and write up testing of new room acoustic prediction and auralisation methods; (3) organise and present results at the first York-Aalto Auralisation Workshop.The project will result in a consolidation of our research codebase to more easily facilitate both this and future studies, at least one major journal publication and a workshop between York and Aalto to allow initial dissemination and feedback on our results, as well as further encourage the ongoing collaboration between our two groups.

室内声学模拟-模拟封闭空间内的声波传播-是音频信号处理的基本应用之一。给定预定义的声源/收听者位置和周围的几何形状，可以找到系统的最终房间脉冲响应（RIR）。与该RIR的卷积允许任何音频信号被放置在声源位置处的房间中，并由放置在接收器位置处的收听者进行试听。这项技术主要有三个应用：（1）音乐制作中的混响模拟：所有音乐都是在混响环境中创作的，无论是音乐厅还是设计用于模拟最佳混响场的算法。(2)建筑声学：其中在建筑物建造/翻新之前对建筑物进行模拟和试听，以确定最终的声学质量并识别可能适当的任何改变。(3)虚拟环境建模：例如计算机游戏、虚拟现实应用和电影/电视后期制作，其中各种声源被放置在虚拟环境中和周围，具有允许与空间交互的潜力。尽管约克和阿尔托的研究都包括基于几何声学技术的标准房间声学模拟方法，（其中假设声音表现为具有与做出这种假设相关的限制的光线）我们的兴趣和努力大多集中在直接求解声波方程的方法上，从而提供了在封闭空间内对声场进行全面、完整和精确模拟的可能性。最近的研究包括最佳网格采样方案，频率相关的扩散边界，空间编码的接收器和源激发策略。定向声源编码和实时可听化也已被探索，采用基于波和几何方法的最佳方面，并为进一步的研究和商业开发提供重要的和真实的潜力。因此，现在存在任何模拟的主要组成特征的解决方案-源激励和方向性，波传播，边界相互作用和接收器编码。这与新的建模方法和使用图形处理单元的可能性相结合，以加快计算时间。迄今为止，这项工作的大部分已被验证使用简单，易于测量的客观指标，如房间模式分析，混响时间，极指向性图，边界特性等，因此，现在似乎适合于解决更苛刻的模拟，以验证这种方法更广泛的问题。将探索许多选项，包括简单的，分析上微不足道的鞋盒形房间，以前公布的数据，形成了对房间声学测量和模拟的循环研究的基础，以及基于直接测量的新的复杂空间的研究，是次访问的目的是促进一项基准研究，以使用和测试新的房间声学预测，听觉化的方法，为一些特定的理想和现实世界的情况。因此，这导致了以下目标：（1）将代码整合到一个适当的框架中，以进行本基准研究;（2）设计、执行和编写新的室内声学预测和可听化方法的测试;（3）在第一次约克会议上组织和介绍结果-阿尔托听觉研讨会。该项目将导致我们的研究代码库的巩固，以更容易地促进这两个和未来的研究，至少一个主要期刊出版物和约克和阿尔托之间的研讨会，以允许初步传播和反馈我们的结果，以及进一步鼓励我们两个小组之间正在进行的合作。

项目成果

Room Impulse Response Synthesis and Validation Using a Hybrid Acoustic Model

• DOI: 10.1109/tasl.2013.2263139
• 发表时间: 2013-09
• 期刊: IEEE Transactions on Audio, Speech, and Language Processing
• 作者: A. Southern;S. Siltanen;D. Murphy;Lauri Savioja

Spatial Encoding of Finite Difference Time Domain Acoustic Models for Auralization

• DOI: 10.1109/tasl.2012.2203806
• 发表时间: 2012-11
• 期刊: IEEE Transactions on Audio, Speech, and Language Processing
• 作者: A. Southern;D. Murphy;Lauri Savioja

Source excitation strategies for obtaining impulse responses in finite difference time domain room acoustics simulation

在有限差分时域室内声学仿真中获取脉冲响应的源激励策略

• DOI: 10.1016/j.apacoust.2014.02.010
• 发表时间: 2014
• 期刊: Applied Acoustics
• 影响因子: 3.4
• 作者: Murphy D