2023_programme: Interaction of sound generated by a high-frequency parametric array with externally generated low-frequency sound

• Session: 16. Trends and Advances in Array Signal Processing
  Organiser(s): Angeliki Xenaki, Peter Gerstoft and Eliza Michalopoulou
• Lecture: Interaction of sound generated by a high-frequency parametric array with externally generated low-frequency sound
  Paper ID: 1944
  Author(s): Uzhansky Ernst, Friedlender Maya, Bucher Izhak
  Presenter: Uzhansky Ernst
  Abstract: As a sound transmitting device based on the nonlinear acoustic theory, parametric acoustic array (PAA) can generate low frequency spatially focused sound beams in wide frequency band using small aperture transducers. Because of this feature, for more than half a century, PAAs have been raising interest in their study and application in various fields both in the air and under water. In this research, an interaction of the sound field generated by the PAA with a low frequency external sound source is studied numerically and experimentally. The experimental setup consisted of a hexagonal array of 48 ultrasonic transducers, 10-channel circular array of microphones and a low-frequency speaker. Both simple amplitude-modulated tone signals and signals of a more complex form and modulation were used. The real-time modulation was done through a fast digital processor. The simulations were done via k-Wave acoustic toolbox considering nonlinearities and power law absorption. The results of experiments and simulations are discussed.
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• Corresponding author: Dr Ernst Uzhansky
  Affiliation: Dynamics Laboratory, Faculty of Mechanical Engineering, Technion – Israel Institute of Technology
  Country: Israel
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