Binaural Direction-of-Arrival Estimation in Reverberant Environments Using the Direct-path Dominance test
* Presenting author
Speaker localization in reverberant environments is an important and current challenge in audio signal processing with several recently methods proposing solutions to this challenge. One such family of methods is based on the direct-path dominance (DPD) test and was developed specifically for spherical arrays. In this paper, the DPD test based method is theoretically extended to arbitrary arrays and is specifically studied for a binaural array, showing good performance under diverse reverberation conditions. This extension of the DPD test based approach uses a spherical harmonics decomposition of the steering matrix to remove the frequency dependence of this matrix within frequency bands using focusing. This facilitates frequency smoothing which is necessary for decorrelating coherent reflections. The success of this focusing process may be affected by the frequency bandwidth as well as the array configuration. This paper presents an analysis of the performance of this focusing process and investigates its impact on the DPD test performance for binaural arrays. It is shown that the frequency bandwidth necessary for frequency smoothing may be sufficiently small such that the focusing stage may be skipped when applying the DPD test for binaural arrays. A simulation study that validates this result is presented.