An analytical expression for measuring of sound transmission loss (TL) has been developed by using two microphones, anudimpedance tube and an impulse sound source as a proposed improvement to the existing procedure after Singh and Katra (1978).udThe calculation procedure is based on the autospectrum of short-time signals captured by the two microphones placed on twoudopposite positions from test sample while the sound source is on its surface. No spectral decomposition is required and the TL isudcalculated directly from the autospectrums of captured signals.
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