Sound Source Direction Localization Scheme on Smart Phones with Dual Microphones

This article introduces a smartphone-based sound source localization scheme that leverages the dual microphones of smartphones. It collects signals emitted by sound sources using the upper and lower microphones of phones, estimates the time delay difference between the signals arriving at the two microphones through double generalized cross-correlation, analyzes the angle of arrival of the sound, and determines the sound source direction based on the geometric relationship between the sound source and the microphones. To address the issue of signal symmetry from sound sources on both the left and right sides reaching the microphones, this article incorporates certain functionalities from virtual audio techniques. It applies virtual rotation to the previously calculated sound source angles, creating an illusion of sound source rotation to distinguish between left and right sound sources. The primary contribution of this article is the proposition of the feasibility of sound source localization through smartphones and the utilization of a sound virtual rotation method to mitigate the symmetry issue in smartphone microphone signal collection. The experimental results validate the effectiveness and accuracy of the algorithm proposed in this article.