Abstract
A method for automatic determination of position of chosen sound events such as speech signals and impulse sounds in 3-dimensional space is presented. The events are localized in the presence of sound reflections employing acoustic vector sensors. Human voice and impulsive sounds are detected using adaptive detectors based on modified peak-valley difference (PVD) parameter and sound pressure level. Localization based on signals from the multichannel acoustic vector probe is performed upon the detection. The described algorithms can be employed in surveillance systems to monitor behavior of public events participants. The results can be used to detect sound source position in real time or to calculate the spatial distribution of sound energy in the environment. Moreover, the spatial filtration can be performed to separate sounds arriving from a chosen direction.
Highlights
The paper addresses the problem of detecting and localizing some selected acoustic events in 3-dimensional acoustic field
The preliminary measurement system was composed of a fixed camera covering the audience, an acoustic vector sensor, the AVS conditioning module and a computer used for data acquisition
A comparison of results obtained in the experiment described in Section 4.4 with the Ground Truth values derived from the architectural plans of the building led to forming calibration functions to correct the computed acoustic wave direction of arrival
Summary
The paper addresses the problem of detecting and localizing some selected acoustic events in 3-dimensional acoustic field. The known solutions for localization of acoustic events in most cases use a microphone (pressure sensor) array and are limited to the calculation of acoustic wave direction of arrival (DoA) [14, 17]. If the acoustic event is detected, the sound source can be localized in the audience using sound localization algorithms, operating on four channels of the AVS sensor (pressure p, particle velocity vx, vy, vz) [1]. The preliminary setup was used for evaluating the detection and the localization of individual sound sources in some selected regions of the audience.
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