提出音频域补偿方法，解决无线音箱采样率偏差导致的立体声失真问题。
Stereo Reproduction in the Presence of Sample Rate Offsets
- 通过空间滤波分离音箱信号，实现采样率偏移估计
- 主观测试显示该方法显著减少空间听感退化
- 适合无线多音箱空间音频系统开发者使用
无线连接音箱进行空间音频播放时，主要挑战来自时钟偏差。这种偏差源于各音箱独立时钟引起的采样率偏移（SRO）。尽管已有如精密时间协议（PTP）和网络时间协议（NTP）等基于网络的同步方案，但SRO对空间音频再现的影响及其感知后果仍缺乏深入研究。本文提出一种音频域SRO补偿方法：利用空间滤波技术分离各音箱的贡献信号，结合原始播放信号估计SRO，并在空间音频播放前进行补偿。主观听音测试与客观指标评估结果表明，该方法能有效缓解由SRO引入的感知退化，成功保持空间声学线索的完整性。
原文摘要 · Abstract (English)
One of the main challenges in synchronizing wirelessly connected loudspeakers for spatial audio reproduction is clock skew. Clock skew arises from sample rate offsets ( SROs) between the loudspeakers, caused by the use of independent device clocks. While network-based protocols like Precision Time Protocol (PTP) and Network Time Protocol (NTP) are explored, the impact of SROs on spatial audio reproduction and its perceptual consequences remains underexplored. We propose an audio-domain SRO compensation method using spatial filtering to isolate loudspeaker contributions. These filtered signals, along with the original playback signal, are used to estimate the SROs, and their influence is compensated for prior to spatial audio reproduction. We evaluate the effect of the compensation method in a subjective listening test. The results of these tests as well as objective metrics demonstrate that the proposed method mitigates the perceptual degradation introduced by SROs by preserving the spatial cues.
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