对比测试新型空间音频编码，发现其在低码率下表现更优。
Perceptual Evaluation of Higher-Order Ambisonic Codecs on Both Synthetic Mixing and Native Recordings
- 用IVAS编码器替代传统多单声道压缩方式
- 相同码率下，IVAS在各类音频上均表现更优
- 特别适合平面波成分少的信号，优势明显
空间音频正广泛应用于虚拟现实、增强现实和沉浸式游戏。高阶全向声（HOA）格式在此背景下尤为关键。传输空间信息需多通道数据，例如3阶全向声需16个通道，导致存储开销大、通信码率高。因此，高效压缩算法必不可少。近期标准化的IVAS编码器可用于通信场景下的HOA内容编码。本文将其与基础的多单声道方法在多种内容和空间化方式下进行对比评估。结果表明，在相同码率下，IVAS显著优于多单声道方法。该编码器利用通道间相关性降低码率。尤其对由少量平面波组成的信号（相关性强），其性能更稳健；而多单声道方法无法利用此类相关性，表现较差。
原文摘要 · Abstract (English)
Spatial audio is spreading in applications such as virtual and augmented reality and immersive games. The higher-order ambisonic (HOA) format is particularly useful in this context. Transmitting spatial information requires multiple channels, e.g., 16 channels for 3rd-order ambisonics, resulting in increased memory requirements for storage and higher bitrates for communication. Therefore, efficient compression algorithms are necessary for those contents. The recently standardized IVAS codec allows the coding of HOA content for communication use-cases. Here, we propose to evaluate it in comparison with a basic multi-mono approach across a variety of contents and spatialization methods. Results show that IVAS outperforms the multi-mono approach at the same bitrate. In particular, this codec exploits inter-channel correlation to reduce the bitrate. We point out that it is therefore especially robust for signals with a high interchannel correlation, such as those composed of a limited number of plane waves. Conversely, the multi-mono approach is unable to exploit this correlation and performs poorly on this type of signal.
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