Maestre Esteban, Scavone Gary P, Smith Julius O
Computational Acoustic Modeling Laboratory, Schulich School of Music, McGill University, Montréal, Québec H2V4K2, Canada.
Center for Computer Research in Music and Acoustics, Music Department, Stanford University, Stanford, California 94350, USA.
J Acoust Soc Am. 2021 Apr;149(4):2768. doi: 10.1121/10.0004241.
A method is presented for simulating the free-field, frequency-dependent directivity of linear sound sources for use in real-time within geometric acoustic environments. The method, which is applied to modeling the directivity of a violin body and a clarinet air column from experimental acoustic data in this study, is based on using minimum-phase measurements to design a state-space filter, allowing the interactive simulation of a time-varying number of radiated sound wavefronts, each toward a time-varying direction. With applicability in sound synthesis and/or auralization within virtual environments, where sound sources change position and orientation dynamically, techniques are proposed for modeling and simulating directivity profiles on perceptual frequency axes with alternatives for representing directivity on a per-vibration-mode basis while incorporating relative phase terms or by reduced-order efficient representations comprising separate components for the signature resonant structure and the associated directivity on an adjustable frequency resolution.
提出了一种用于在几何声学环境中实时模拟线性声源自由场、频率相关指向性的方法。在本研究中，该方法应用于根据实验声学数据对小提琴琴身和单簧管气柱的指向性进行建模，其基于使用最小相位测量来设计状态空间滤波器，从而能够交互式模拟随时间变化的多个辐射声波前，每个波前朝向随时间变化的方向。鉴于该方法适用于虚拟环境中的声音合成和/或听觉化，其中声源会动态改变位置和方向，本文提出了一些技术，用于在感知频率轴上对指向性轮廓进行建模和模拟，同时还提供了在考虑相对相位项的情况下按每个振动模式表示指向性的替代方案，或者通过包含特征共振结构的单独组件以及在可调频率分辨率下的相关指向性的降阶有效表示来实现。
