宽间距阵列迭代信噪比加权聚合角度谱研究  

Study on iterative SNR-based angular spectrum for widely spaced microphone array

作　　者：徐佳新 赵兆[1] 许志勇[1] 

机构地区：[1]南京理工大学电子工程与光电技术学院电子工程系,江苏南京210094

出　　处：《电声技术》2016年第5期54-58,共5页Audio Engineering

基　　金：国家自然科学基金项目(61171167;61401203);江苏省自然科学基金项目(BK20130776)

摘　　要：针对宽间距传声器阵列在混响环境下的多声源波达方向(DOA)估计问题,基于弥漫噪声模型研究了一种能有效抑制空间混叠影响的迭代信噪比加权聚合角度谱方法。该方法利用声源信号的时频稀疏和短时正交性,在每个时频点针对空间混叠周期的频变特点迭代消除各个真实声源在时频局域角度谱中的伪峰,从而在最终的聚合角度谱中有效抑制了空间混叠影响。在混响条件下针对不同声源数目进行了仿真实验,结果验证了所述方法的有效性。In this paper, for a widely spaced microphone array introducing ambiguity in angular spectrum for multiple acous- tic sources in a reverberant condition, a pooled angular spectrum method based on iterative signal-to-ratio （SNR） weighting and diffuse noise model is proposed. Using the property of time-frequency sparsity and short-time orthogonality of speech sources, the approach eliminates false peaks in each time-frequency local angular spectrum based on the frequency-dependent locations of aliasing-induced grate lobes. As a result, the influence of spatial aliasing is considerably suppressed in the final pooled angular spectrum. Experiments are conducted in a reverberant condition with different number of sources and the results show the effectivity of the proposed method.

关 键 词：多声源定位 波达方向估计 空间混叠抑制 聚合角度谱 

分 类 号：TN912.3[电子电信—通信与信息系统]