Proceedings of the 11th Convention of the
European Acoustics Association
Forum Acusticum / EuroNoise 2025


Málaga, Spain
June 23 - 26, 2025





Session: A16.06 Source directivity: capturing, processing, and evaluating its effects
Date: Tuesday 24 June 2025
Time: 14:20
Title: A robotic system for space-time characterization of parametric acoustic sound sources
Author(s): Augusto Fantinelli
Marc Arnela
Eric Brandão
Efren Fernandez-Grande
Pages: 4457-4464
DOI: https://www.doi.org/10.61782/fa.2025.0050
PDF: https://dael.euracoustics.org/confs/fa2025/data/articles/000050.pdf
Conference proceedings
Abstract

Parametric acoustic loudspeakers use arrays of ultrasonic transducers to generate audible fields through the non-linearities of the propagation medium. Despite being commercially well consolidated, some aspects of the generated audible field still deserve further investigation, among them the spatial distribution of the radiated sound. This paper describes the acquisition of impulse responses generated by parametric loudspeaker prototypes using an automated system to scan the sound field spatially. The scanning system comprises a 6-degree-of-freedom robotic arm mounted over a linear track for increased spatial coverage. The robot positions the microphone in pre-specified locations inside two desired apertures irradiated by the sound source. First, the scan of a normal plane to the source axis allows future applications using near-field acoustic holography and sound field reconstruction. Second, scanning planes parallel to the source axis allows direct visualization of the sound field radiated by the source. This work showcases the first steps in implementing such measurements for parametric acoustic loudspeakers.