Title :
Ultrasound-to-ultrasound Volterra filter identification of the parametric array loudspeaker
Author :
Shi, Chuang ; Kajikawa, Yoshinobu
Author_Institution :
Department of Electrical and Electronic Engineering, Kansai University, Osaka, Japan
Abstract :
The Volterra filter is a favorable approach to represent a variety of nonlinear systems, including the parametric array loudspeaker (PAL), which is a weak nonlinear acoustic system to create directional sounds. Using the Volterra filter to model the sound process of the PAL saves the computational cost of solving the nonlinear acoustic equation. In the past studies, the Volterra filter is identified from the audio input to the audio output of the PAL, which is known as the audio-to-audio Volterra filter (A2VF). In this paper, the ultrasound-to-ultrasound Volterra filter (U2VF) is recommended. The experiment results validate that the U2VF outperforms the A2VF, in terms of the robustness to the change of the modulation index in the PAL.
Keywords :
Arrays; Frequency modulation; Loudspeakers; Mathematical model; Nonlinear acoustics; Volterra filter; modulation index; nonlinear system identification; parametric array loudspeaker; total harmonic distortion;
Conference_Titel :
Digital Signal Processing (DSP), 2015 IEEE International Conference on
Conference_Location :
Singapore, Singapore
DOI :
10.1109/ICDSP.2015.7251319