Improved pre-filtering stages for GCC-based direction of arrival estimation using smartphone
Abdullah Küçük, Anshuman Ganguly, Issa M. S. Panahi · The Journal of the Acoustical Society of America · 2018
Sound source localization (SSL) is one of the important areas in signal processing especially for hearing aid applications. Having at least two microphones and powerful processing capability makes smartphone as a good sound source locator for people who have hearing impairment. In our previous work, we showed that traditional Generalized Cross Correlation (GCC) method with spatial post-filtering stage would increase the performance of instantaneous estimation of direction of arrival (DOA). In this paper, we combine a spectral pre-filtering stage with our previous work to improve the noise robustness of the earlier method. By combining pre-filtering stage with GCC and post-filtering stage, we obtain robust DOA estimation under various realistic noise types. We experiment with several pre-filtering stages and study their impact on reducing root mean square error (RMSE) and mean absolute error (MAE) for DOA estimation. The real-time implementation of some of the proposed algorithms on smartphone is also presented.