Geometrical approaches for room acoustics simulation have the advantage of requiring limited computational resources while still achieving a high perceptual plausibility. A common approach is using the image source model for direct and early reflections in connection with further simplified models such as a feedback delay network for the diffuse reverberant tail. When recreating real spaces as virtual acoustic environments using room acoustics simulation, the perceptual relevance of individual parameters in the simulation is unclear. Here we investigate the importance of underlying acoustical measurements and technical evaluation methods to obtain high-quality room acoustics simulations in agreement with dummy-head recordings of a real space. We focus on the role of source directivity. The effect of including measured, modelled, and omnidirectional source directivity in room acoustics simulations was assessed in comparison to the measured reference. Technical evaluation strategies to verify and improve the accuracy of various elements in the simulation processing chain from source, the room properties, to the receiver are presented. Perceptual results from an ABX listening experiment with random speech tokens are shown and compared with technical measures for a ranking of simulation approaches.

翻译：基于几何方法的室内声学模拟具有计算资源需求有限且仍能实现较高感知逼真度的优势。常见方法是将用于直达声和早期反射的镜像声源模型与进一步简化的模型（如用于扩散混响尾音的反馈延迟网络）相结合。在利用室内声学模拟将真实空间重构为虚拟声学环境时，模拟中各个参数的感知相关性尚不明确。本研究探讨了基础声学测量与技术评估方法对于获得与真实空间假头录音相一致的优质室内声学模拟的重要性。我们重点分析了声源指向性的作用，通过对比实测数据、评估了在室内声学模拟中纳入实测、建模及全向声源指向性的效果。研究提出了从声源、房间特性到接收者的模拟处理链中各环节精度验证与改进的技术评估策略，展示了基于随机语音片段的ABX听力实验感知结果，并将其与技术指标进行对比，对模拟方法进行了排序。