研究立体声处理对音频质量的影响，拓展了开放音频质量数据集。
Investigating the impact of stereo processing -- a study for extending the Open Dataset of Audio Quality (ODAQ)
- 将单声道失真与左右/中侧立体声处理组合测试
- 直接对比时左右与中侧处理差异显著，且听感侧重音色而非空间感
- 16位专家评分支持音色比空间特性更影响主观评价
本文开展了一项初步研究，旨在扩展开放音频质量数据集（ODAQ），以考察立体声处理的影响。将原ODAQ中的单声道失真与左右（LR）和中侧（MS）立体声处理结合，测试对象包括独奏乐器、典型宽立体声混音及硬偏移混音。在不同呈现情境下（有无直接对比MS与LR条件）进行了听觉测试，收集主观数据，不仅涵盖单声道失真，还检验了测试方法学。数据集新增材料，并包含16位专家听众的主观评分。结果显示，刺激物的空间特性及呈现情境均具显著影响。值得注意的是，多个LR与MS之间的显著差异仅在直接对比时出现。结果表明，当空间特性一致时，听者主要评估音色损伤；而音色相似时，则关注立体声图像。额外添加的单声道参考项评分在所有立体声条件下总体一致，平均为MUSHRA量表上的65分，进一步证实听者优先关注音色而非空间印象。
原文摘要 · Abstract (English)
In this paper, we present an initial study for extending Open Dataset of Audio Quality (ODAQ) towards the impact of stereo processing. Monaural artifacts from ODAQ were adapted in combinations with left-right (LR) and mid-side (MS) stereo processing, across stimuli including solo instruments, typical wide stereo mixes and and hard-panned mixes. Listening tests in different presentation context -- with and without direct comparison of MS and LR conditions -- were conducted to collect subjective data beyond monaural artifacts while also scrutinizing the listening test methodology. The ODAQ dataset is extended with new material along with subjective scores from 16 expert listeners. The listening test results show substantial influences of the stimuli's spatial characteristics as well as the presentation context. Notably, several significant disparities between LR and MS only occur when presented in direct comparison. The findings suggest that listeners primarily assess timbral impairments when spatial characteristics are consistent and focus on stereo image only when timbral quality is similar. The rating of an additional mono anchor was overall consistent across different stereo characteristics, averaging at 65 on the MUSHRA scale, further corroborating that listeners prioritize timbral over spatial impressions.
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