Evaluation of virtual acoustic environments

该子项目将采用不同的策略，以最大限度地提高双耳模拟的质量，作为财团的中央评估平台。在分析现有系统缺点的基础上，将对具有个性化耳机均衡和具有最小相位插值的单独过渡段标度的外耳塞耳机的好处进行严格的合理性和真实性测试，分别定义为关于内部或外部参考的感知身份。开发的双耳参考系统将用于记录和模拟自然声学环境的代表性样本，并创建该联合体中使用的所有扬声器阵列系统的双耳表示，这是子项目P3-P9的感性评价所需要的。将获得一个新的hrtf数据库，具有高空间分辨率和头部高于躯干的不同方向。这些是数值模拟环境（PI, P2）的可视化以及在消声条件下的所有其他评估所必需的。基于记录的hrtf / brr，对比评价不同的插值方法。应开发虚拟声学环境质量的共识词汇表，作为与信号链上各种系统参数相关的分类法。将提供用于执行感知评估的软件，包括所需的所有测试范例和方法，并能够直接驱动联盟中使用的所有模拟系统。因此，开发了一套全面的方法、工具和数据来评估虚拟声学环境，这对提议的联盟至关重要，对项目结束后的更大的声学社区具有相当大的价值。

The subproject will exploit different strategies to maximize the quality of binaural simulations to be used as a central evaluation platform for the consortium. Based on an analysis of shortcomings of state of the art systems, the benefit of extraaural headphones with individualized headphone equalization and individual ITD scaling with minimum phase Interpolation will be evaluated with a strict test on plausibility and authenticity, defined as the perceptual identity with regard to an internal or external reference, respectively.The developed binaural reference system will be used to record and auralize a representative sample of natural acoustic environments and to create binaural representations of all loudspeaker array systems used in the consortium - required for perceptual evaluations in subprojects P3-P9. A new database of HRTFs will be acquired with high spatial resolution and for different orientations of head above torso. These are required for the auralization of numerically modelled environments (PI, P2) and for all other evaluations under anechoic conditions. Based on the recorded HRTFs/BRIRs, different interpolation methods will be comparatively evaluated.A consensus vocabulary for the qualities of virtual acousfic environments shall be developed, serving as a taxonomy to be related to a variety of system parameters along the signal chain. A software for performing perceptive evaluations will be provided, including all tests paradigms and methods required and able to drive all simulation systems used in the consortium direcly. Thus, a comprehensive collection of methods, tools, and data for the evaluation of virtual acoustic environments is developed, essential for the proposed consortium and of considerable value for the larger acoustical community after the project.