High order Ambisonic decoding method for irregular loudspeaker arrays
High order Ambisonic decoding method for irregular loudspeaker arrays
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发表时间：
2010
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通讯作者：
J. Treviño;T. Okamoto;Y. Iwaya;Yôiti Suzuki
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作者：
J. Treviño;T. Okamoto;Y. Iwaya;Yôiti Suzuki
高保真度立体声技术是一种声场合成和再现技术，在传送三维空间化声音方面显示出了良好的效果。高保真度立体声编码直接描述声场的空间特性，而不参考再现系统。声场的精确再生需要大量的扬声器布置，以便充分采样所有方向;这被称为规则布局。不难找到解码矩阵来使用均匀分布的扬声器再现高保真度立体声录音。然而，在大多数情况下，均匀地定位大量扬声器是不可行的。然而，已知不规则阵列导致病态和奇异重编码矩阵。提出了一种在不规则扬声器阵列上精确再现高阶高保真立体声录音的方法。我们的方法包括三个阶段，旨在利用阵列的任何部分，同时使用不对称定位的扬声器来扩大收听音量。我们使用不规则的157通道扬声器阵列评估了我们的提案。与主流解码方法进行了比较。所提出的方案导致收听音量的大小的总体增加。
Ambisonics, a sound field synthesis and reproduction technique, has shown promising results in conveying three-dimensional spatialized sound. Ambisonic encodings directly describe the spatial properties of sound fields without reference to the reproduction system. Precise regeneration of a sound field requires a large number of loudspeakers arranged so as to adequately sample all directions; this is referred to as a regular layout. It is not difficult to find a decoding matrix to reproduce Ambisonic recordings using uniformly distributed loudspeakers. Nevertheless, evenly locating a large number of loudspeakers is not feasible in most scenarios. Irregular arrays, however, are known to lead to ill-conditioned and singular re-encoding matrices. We propose a method for accurate reproduction of high order Ambisonic recordings over irregular loudspeaker arrays. Our approach consists of three stages which aim to exploit any regularities of the array, while using asymmetrically located loudspeakers to expand the listening volume. We evaluated our proposal using an irregular 157-channel loudspeaker array. Comparisons with mainstream decoding methods were conducted. The proposed scheme results in an overall increase in the size of the listening volume.