微型麦克风阵列声源定位系统设计

Design of Acoustic Source Localization Micro--System based on Microphone Array

针对空间和成本受限的应用领域，通过使用STM32芯片内置的2路A／D实现4路麦克风信号准同步采集，设计了一种微型麦克风阵列声音采集硬件系统。并将声达时间差（TDOA）机理的定位算法移植到所设计的硬件系统，实现了声源定位。实测结果表明，该系统设计方法能够实现4路声音信号的准同步采集，并能在STM32系统硬件平台上实现实时声源定位。

Considering the cost and size--constrained applications, a micro hardware system of acoustic source localization based on microphone array is designed. Quasi-synchronous acquisition of 4--ch microphone signals are implemented by using the 2--ch ADC built in STM32F chip. Time difference of arrival （TDOA） mechanism is used to measure the acoustic source direction. The experiment results in- dicate that the system hardware design based on STM32 chip can realize the quasi--synchronous acquisition of 4--ch microphone array and real--time estimation of the sound source location.