Sound-Intensity-Based Direction of Arrival Estimation Using Centro-Symmetric Sensor Arrays

Sound source Direction of Arrival (DOA) estimation is pivotal in various applications such as speech recognition, source localization, and acoustic surveillance. Sound Intensity (SI) based DOA estimation methods have been proven to being an appealing alternative to more traditional approaches based on Time-Difference of Arrival (TDOA) and Steered-Response Power (SRP). The existing literature primarily focuses on simple microphone array geometries or assumes known SI measurements, limiting practical applicability. To address this, we propose methodologies tailored to Center-Symmetric Arrays (CSAs), defined as arrays composed of an arbitrary number of pairs of microphones sharing the same symmetry center. CSAs showcase satisfactory performance even in non-standard geometries, and CSAs with more than four elements enhance the robustness of the method against noise.