New models and approaches for the robust equalization of loudspeaker-room systems

随着多种形式的视听通信（例如，以舒适的多通道免提电话的形式或通过创建用于多媒体应用的虚拟声学环境）的日益增长的存在，扬声器室系统的优化具有很大的实际重要性。所提出的研究的目的是调查这种系统的设计的新方法，并以最佳的方式使空间体积的均衡。在本申请人的先前工作中，已经成功地示出了如何通过根据给定衰减曲线对总体响应进行整形来替换逆滤波范例，从而可以有效地均衡遭受严重混响的声学混响扬声器室系统。在理想情况下（例如，具有足够长的均衡器），干扰混响可以被减少到使其变得听不见。在所提出的研究中，由申请人开发的用于休息室均衡和串扰消除的鲁棒设计范例将以这样的方式被扩展，使得可以允许听众的更大的移动。为此，新的统计模型的位置相关的系统扰动和基于压缩感知的方法，用于估计（内插，外推）的房间脉冲响应的开发和纳入房间均衡。例如，目标是最小化所需测量的数量，同时实现与根据空间采样定理对房间进行完整测量几乎相同的鲁棒性。对于自适应解决方案，头部位置将用光学跟踪系统捕获并并入自适应均衡中。这种适应奠定了通过扬声器在混响环境中呈现3D音频的基础，并且所提出的基于模型的方法有可能克服现有串扰消除系统对几乎消声室的限制。将在项目范围内调查性能极限。为了在滤波器设计过程中最佳地利用现有的自由度，伪影的感知将在算法设计中发挥重要作用。

With the growing presence of multiple forms of audio-visual communication, for example, in form of comfortable multi-channel hands-free telephony or by the creation of virtual acoustic environments for multimedia applications, the optimization of loudspeaker-room systems is of great practical importance. The objective of the proposed research is to investigate new approaches for the design of such systems and to enable the equalization of spatial volumes in an optimal way. In previous works of the applicant, it has been successfully shown how acoustic loudspeaker-room systems that suffer from severe reverberation can be effectively equalized by replacing the inverse-filtering paradigm by a shaping of the overall response according to a given decay curve. In ideal cases (e.g. with sufficiently long equalizers) disturbing reverberation can be reduced so far that it becomes inaudible. In the proposed research, the robust design paradigms for listening-room equalization and crosstalk cancellation developed by the applicant are to be extended in such a way that larger movements of listeners can be allowed. For this, novel statistical models for position-dependent system perturbations and compressed-sensing based methods for the estimation (interpolation, extrapolation) of room impulse responses are to be developed and incorporated into room equalization. The goal is, for example, to minimize the number of required measurements while achieving nearly the same robustness as with a complete measuring of the room according to the spatial sampling theorem. For adaptive solutions, the head position is to be captured with an optical tracking system and incorporated into an adaptive equalization. This adaptation founds the basis for the presentation of 3D audio via loudspeakers in reverberant environments, and the proposed model-based approach has the potential to overcome the limitations of existing crosstalk-cancellation systems to nearly anechoic rooms. The limits of performance are to be investigated within the project. To optimally exploit the existing degrees of freedom during filter design, the perception of artifacts will play an important role within the algorithm design.