Abstract
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.
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