Spatial Encoding of Finite Difference Time Domain Acoustic Models for Auralization
Spatial Encoding of Finite Difference Time Domain Acoustic Models for Auralization
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DOI：
10.1109/tasl.2012.2203806
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
A. Southern;D. Murphy;Lauri Savioja
中科院分区：
文献类型：
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作者：
A. Southern;D. Murphy;Lauri Savioja
单个房间的脉冲响应可以从客观和主观两个方面揭示给定空间的声学信息。然而，为了获得更多的空间信息，或者更准确、更令人信服的听觉识别，需要多个脉冲响应。高阶并声学是一种强健的方法，可以在多个通道上捕获声音空间的空间质量，以便在许多可能的扬声器布局上进行解码和渲染。提出了一种利用差动传声器技术从低阶室内声学模型中获取N阶声脉冲响应的方法。这是使用基于多个圆形接收器阵列的二维有限差分法房间声学模拟的三阶编码来测试的。获得了准确的声道方向分布，并在一系列收听测试中验证了结果，该测试将放置在给定模拟内的声源的定位与直接编码的相同声源进行比较。该通用编码方案可以应用于任何室内声学模拟技术，其中可以获得跨越多个接收器位置的脉冲响应。虽然所提出的方法只包含水平编码，但它也可以直接应用于最终可听化中不需要高度信息的3D模拟中。
A single room impulse response can reveal information about the acoustics of a given space in both objective, and, when used for auralization, subjective terms. However, for additional spatial information, or more accurate and perceptually convincing auralization, multiple impulse responses are needed. Higher order Ambisonics is a robust means of capturing the spatial qualities of an acoustic space over multiple channels for decoding and rendering over many possible speaker layouts. A method for obtaining $N$th-order Ambisonic impulse responses from a room acoustic model, based on lower orders using differential microphone techniques is presented. This is tested using a third-order encoding of a 2-D finite difference time domain room acoustic simulation based on multiple circular arrays of receivers. Accurate channel directional profiles are obtained and results are verified in a series of listening tests comparing the localization of a sound source placed within the given simulation to the same source encoded directly. This generic encoding scheme can be applied to any room acoustic simulation technique where it is possible to obtain impulse responses across multiple receiver positions. Although the proposed method encompasses horizontal encoding only, it can also be applied directly in 3-D simulations where height information is not required in the final auralization.