无需先验信息，用任意麦克风阵列定位早期混响方向
Blind Localization of Early Room Reflections with Arbitrary Microphone Array
- 基于相位对齐相关法，适配任意麦克风阵列结构
- 32麦克风球形阵列下感知质量最优，6麦克风半圆阵列略差
- 改进算法降低误报率，提升混响定位可靠性
在未知房间脉冲响应和声源信号的情况下，盲估计早期混响的到达方向（DoA）对音频信号处理极具价值。近期提出的FF-PHALCOR方法将原PHALCOR扩展至适用于任意阵列而非仅球形阵列。本研究全面分析该方法性能与局限性，考察延迟、幅度及空间密度等反射特性对其效果的影响。研究还提出改进方案以克服限制，提升检测精度并减少误报。此外，通过使用估计的反射信息生成房间脉冲响应，评估其对空间感知的影响。结果表明，所提方法相较基线具有感知优势，尤其在32麦克风球形阵列下表现最佳；而6麦克风半圆阵列下的感知质量略有下降。
原文摘要 · Abstract (English)
Blindly estimating the direction of arrival (DoA) of early room reflections without prior knowledge of the room impulse response or source signal is highly valuable in audio signal processing applications. The FF-PHALCOR (Frequency Focusing PHase ALigned CORrelation) method was recently developed for this purpose, extending the original PHALCOR method to work with arbitrary arrays rather than just spherical ones. Previous studies have provided only initial insights into its performance. This study offers a comprehensive analysis of the method's performance and limitations, examining how reflection characteristics such as delay, amplitude, and spatial density affect its effectiveness. The research also proposes improvements to overcome these limitations, enhancing detection quality and reducing false alarms. Additionally, the study examined how spatial perception is affected by generating room impulse responses using estimated reflection information. The findings suggest a perceptual advantage of the proposed approach over the baseline, with particularly high perceptual quality when using the spherical array with 32 microphones. However, the quality is somewhat reduced when using a semi-circular array with only 6 microphones.
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