Loudspeaker Nonlinear Distortion Signal Instantaneous Frequency Measurement and Analysis

Yu Tian Wang; Hui Wang; Qin Zhang

doi:10.4028/www.scientific.net/AMM.203.83

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 203Loudspeaker Nonlinear Distortion Signal...

Loudspeaker Nonlinear Distortion Signal Instantaneous Frequency Measurement and Analysis

Abstract:

Loudspeaker is a strongly nonlinear system which is associated with several situations such as electronic, magnetic, mechanical and acoustic. Recently, most of the methods used to measure and analysis loudspeaker are based on the FFT. Unfortunately, traditional Fourier transform based signal analysis method usually causes meaningless results when it is used to analysis non-stationary and nonlinear signal. In this paper, we use Hilbert-Huang transform (HHT) to review the instantaneous frequency of loudspeaker output. Experiments demonstrate that the distortion of loudspeaker can be recognized as intrawave frequency modulation caused by wave profile deformation. Then a novel nonlinear distortion measurement method is proposed which can reveal more accurate and physical meaningful characteristic of loudspeaker.

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Periodical:

Applied Mechanics and Materials (Volume 203)

Pages:

83-87

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.203.83

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Online since:

October 2012

Authors:

Yu Tian Wang, Hui Wang, Qin Zhang

Keywords:

HHT, Instantaneous Frequency, Loudspeaker Nonlinear Distortion

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