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Advances in Acoustics and Vibration
Volume 2009, Article ID 574604, 3 pages
Review Article

Analytical Expression for Sound Transmission Loss Calculation: An Improvement to the Existing Method after Singh and Katra

The Iwany Acoustics & Applied Physics Research Group (iARG), Physics Department, Faculty of Mathematics and Natural Sciences, Sebelas Maret University, Jl. Ir. Sutami 36A Kentingan, Solo 57126, Indonesia

Received 12 September 2009; Accepted 23 October 2009

Academic Editor: Fidel E. Hernandez Montero

Copyright © 2009 Iwan Yahya. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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