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Modeling Nonlinearity of Air with Volterra Kernels for Use in a Parametric Array Loudspeaker

The use of a parametric array in air as a directional audio loudspeaker has been reported in previous literature and the self-demodulation phenomenon is well-understood to seriously distort the generated audible sound as a result of inter-modulation distortion. We propose to model the nonlinear interaction in air using a second-order Volterra kernel at the Rayleigh distance within which sound intensity and parametric conversion efficiency are assumed to be high. Results first obtained from Burgers' equation-based numerical simulations and actual measurements are then used in the nonlinear system identification process.

Authors: Lee, Kelvin Chee-Mun; Yang, Jun; Gan, Woon Seng; Er, Meng-Hwa
Affiliation: Digital Signal Processing Laboratory, School of EEE,Nanyang Technological University, Singapore
AES Convention:112 (April 2002) Paper Number:5635 Import into BibTeX
Subject:Signal Processing Forum

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