Detecção de direção de chegada de fontes sonoras com matrizes de microfones

Abstract

This work presents the study and implementation of a sound source direction of arrival detection system that uses a microphone array. The algorithm implemented on the system estimates the time difference of arrival using the cross correlation between the signals captured by the microphones and uses it to determine the direction of the captured sound. To test the algorithm, a 2D simulation environment was implemented. The tests were executed using 3 microphones, many sound source types and different environment settings, such as different sound source positions and signal amplitudes, different microphone triangle shapes and different environmental noise intensity. It was concluded that an equilateral triangle whose side measures between 5 and 10𝑐𝑚 can detect directions with a precision of 3∘ if the signal-to-noise ratio is greater than 0𝑑𝐵. For more accurate detections using the same microphone configuration, increasing the size of the triangle becomes necessary.