论文标题
来自赤道麦克风阵列的信号的Ambisonic编码
Ambisonic Encoding of Signals From Equatorial Microphone Arrays
论文作者
论文摘要
（Ahrens等，2021）中介绍的赤道麦克风阵列计算基于刚性球形挡板赤道的压力传感器的声场的球形谐波（SH）表示。原始配方使用复杂值的SH基函数。如果捕获的声场的SH表示旨在通过实现的音频信号存储在时域中，则这是不方便的，因为它在Ambisonics的空间音频格式中很常见。本文档总结了需要应用于（Ahrens等，2021）的数学公式的修改，以产生与捕获的声场的Ambisonic表示，该声音场与Sparta和IEM Sparine Suite等既定的Ambison Software工具兼容。提供了实现此公式的示例MATLAB脚本。
The equatorial microphone array presented in (Ahrens et al., 2021) computes a spherical harmonic (SH) representation of a sound field based on pressure sensors along the equator of a rigid spherical baffle. The original formulation uses complex-valued SH basis functions. This is inconvenient if the SH representation of the captured sound field is intended to be stored in time domain by means of real-valued audio signals as it is common in the spatial audio format of ambisonics. The present document summarizes the modifications that need to be applied to the mathematical formulation from (Ahrens et al., 2021) to produce an ambisonic representation of the captured sound field that is compatible with the established ambisonic software tools like SPARTA and the IEM Plugin Suite. An example MATLAB script that implements this formulation is provided.
