Towards End-to-End Acoustic Localization Using Deep Learning: From Audio Signal to Source Position Coordinates

• DOI: 10.20944/preprints201807.0570.v1
• Publication Date: 2018-08-07T04:26:16Z
• Authors: Juan Manuel Vera-...; Daniel Pizarro; Javier Macias-Gua...
• Keywords: FOS: Computer and information sciences; Sound (cs.SD); Acoustic source localization; microphone arrays; acoustic source localization; TP1-1185; 02 engineering and technology; Computer Science - Sound; Article; Audio and Speech Processing (eess.AS); convolutional neural networks; FOS: Electrical engineering, electronic engineering, information engineering; 0202 electrical engineering, electronic engineering, information engineering; artificial_intelligence_robotics; Chemical technology; deep learning; Deep learning; Microphone arrays; Convolutional neural networks; Electrónica; Electronics; Electrical Engineering and Systems Science - Audio and Speech Processing

This paper presents a novel approach for indoor acoustic source localization using microphone arrays and based on a Convolutional Neural Network (CNN). The proposed solution is, to the best of our knowledge, the first published work in which the CNN is designed to directly estimate the three dimensional position of an acoustic source, using the raw audio signal as the input information avoiding the use of hand crafted audio features. Given the limited amount of available localization data, we propose in this paper a training strategy based on two steps. We first train our network using semi-synthetic data, generated from close talk speech recordings, and where we simulate the time delays and distortion suffered in the signal that propagates from the source to the array of microphones. We then fine tune this network using a small amount of real data. Our experimental results show that this strategy is able to produce networks that significantly improve existing localization methods based on SRP-PHAT strategies. In addition, our experiments show that our CNN method exhibits better resistance against varying gender of the speaker and different window sizes compared with the other methods.