Archives of Acoustics, 40, 4, pp. 503–512, 2015
10.1515/aoa-2015-0050

Applications and Comparison of Continuous Wavelet Transforms on Analysis of A-wave Impulse Noise

Jun QIN
http://www.engr.siu.edu/~jqin/
Southern Illinois University Carbondale
United States

Pengfei SUN
Southern Illinois University Carbondale
United States

Noise induced hearing loss (NIHL) is a serious occupational related health problem worldwide. The A-wave impulse noise could cause severe hearing loss, and characteristics of such kind of impulse noise in the joint time-frequency (T-F) domain are critical for evaluation of auditory hazard level. This study focuses on the analysis of A-wave impulse noise in the T-F domain using continual wavelet transforms. Three different wavelets, referring to Morlet, Mexican hat, and Meyer wavelets, were investigated and compared based on theoretical analysis and applications to experimental generated A-wave impulse noise signals. The underlying theory of continuous wavelet transform was given and the temporal and spectral resolutions were theoretically analyzed. The main results showed that the Mexican hat wavelet demonstrated significant advantages over the Morlet and Meyer wavelets for the characterization and analysis of the A-wave impulse noise. The results of this study provide useful information for applying wavelet transform on signal processing of the A-wave impulse noise.
Keywords: continuous wavelet transform; impulse noise signal processing; time-frequency domain; temporal and spectral resolutions, noise induced hearing loss.
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DOI: 10.1515/aoa-2015-0050

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