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The Fourier transform has become one of the most analytical tools,
which is used for the sound intensity analysis and acoustic
measurement in many industrial areas. But this method has the
limitation that sound sources to measure need to be stationary and
it does not provide true characteristics of time varying signals.
Instead of the Fourier transform, advanced analysis methods such as
the short-time Fourier transform, the Wigner-Ville distribution and
the wavelet transform were proposed. These instantaneous spectrum
analysis methods can be applied for obtaining the instantaneous
intensity of non-stationary signals. This book shows the basic
concepts of the Fourier transform and other instantaneous spectrum
analysis, and also gives the theory and applications of
instantaneous intensity analysis methods including their advantages
and disadvantages. The instantaneous structural intensity analysis
and other acoustical analysis methods, which provide readers useful
techniques for engineering acoustics, are also presented.
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