Direct-Path Signal Cross-Correlation Estimation for Sound Source Localization in Reverberation

Wei Xue, Ying Tong, Guohong Ding, Chao Zhang, Tao Ma, Xiaodong He, Bowen Zhou

Sound source localization (SSL) is challenging in presence of reverberation since the cross-correlation between the direct-path signals in different microphones, which indicates the spatial information of the sound source, is interfered by the reverberation signal components. A novel algorithm is proposed in this paper to estimate the cross-correlation of the direct-path speech signals, such that the robustness of SSL to reverberation can be improved. The proposed method follows a similar scheme to the multichannel linear prediction (MCLP), which is commonly used for speech dereverberation, while avoids the explicit estimation of the direct-path signal of each channel. This is achieved by revealing the relationship between the direct-path signal cross-correlation (DPCC) and the MCLP coefficient vector, and finally deriving the DPCC by using only the multichannel reverberant signals. It is also shown that the pre-whitening operation, which is widely used for SSL, can be inherently integrated into the estimated DPCC. An adaptive method is further derived to facilitate online frame-level SSL. The proposed method can be easily applied to conventional cross-correlation based SSL methods by using the DPCC rather than the full cross-correlation. Experiments conducted in various reverberant conditions demonstrate the effectiveness of the proposed method.

 DOI: 10.21437/Interspeech.2019-1488

Cite as: Xue, W., Tong, Y., Ding, G., Zhang, C., Ma, T., He, X., Zhou, B. (2019) Direct-Path Signal Cross-Correlation Estimation for Sound Source Localization in Reverberation. Proc. Interspeech 2019, 2693-2697, DOI: 10.21437/Interspeech.2019-1488.

  author={Wei Xue and Ying Tong and Guohong Ding and Chao Zhang and Tao Ma and Xiaodong He and Bowen Zhou},
  title={{Direct-Path Signal Cross-Correlation Estimation for Sound Source Localization in Reverberation}},
  booktitle={Proc. Interspeech 2019},