Optimized Acoustic Localization with SRP-PHAT for Monitoring in Distributed Sensor Networks

Abstract

Abstract-Acoustic localization by means of sensor arrays has a variety of applications, from conference telephony to environment monitoring. Many of these tasks are appealing for implementation on embedded systems, however large dataflows and computational complexity of multi-channel signal processing impede the development of such systems. This paper proposes a method of acoustic localization targeted for distributed systems, such as Wireless Sensor Networks (WSN). The method builds on an optimized localization algorithm of Steered Response Power with Phase Transform (SRP-PHAT) and simplifies it further by reducing the initial search region, in which the sound source is contained. The sensor array is partitioned into sub-blocks, which may be implemented as independent nodes of WSN. For the region reduction two approaches are handled. One is based on Direction of Arrival estimation and the other -on multilateration. Both approaches are tested on real signals for speaker localization and industrial machinery monitoring applications. Experiment results indicate the method's potency in both these tasks.

Object detection for military surveillance using distributed multimodal smart sensors

“…To overcome problems associated with communicating signal frames we apply a simplified localization approach of Initial Search Region Reduction (ISRR), recently developed by our research team [1]. The main idea behind ISRR lies in maximally confining the region of acoustic source disposition as a preliminary procedure to SRP-PHAT or other localization method [6]. Having already established that SRP-PHAT requires raw information from all sensors in the network, we do not apply it for this specific ISR system configuration.…”

Improvement of learning-based methods for localization of multiple sound sources

“…In this case in the scope of this thesis the collection of receivers is called not an array, but a distributed sensor network. Sensor networks were investigated by Astapov et al (2015). When a set of distributed receiver arrays are used instead of singular microphones, a configuration is called distributed sensor array.…”

A Survey of Sound Source Localization Methods in Wireless Acoustic Sensor Networks

“…Since SRP approaches are based on the exploitation of TDOA information, synchronization issues also arise when applying SRP in WASNs. As in the case of source localization using DOAs or TDOAs, SRP-based approaches for WASNs have been proposed considering that multiple microphones are available at each node [89][90][91]. In these cases, the SRP method can be used for acquiring DOA estimates at each node or collecting source location estimates that are merged by a central node.…”