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Noise Control Services
Normal sound transmission loss
The normal incidence sound transmission loss characterizes the sound insulation performance of the tested sample when it is excited by a normal incidence acoustical wave. It is mainly useful to rank the performance of sound barriers.
Equipment: Transmission tube
Method: Three or four microphone transmission tube and the transfer-function method [1,2]
Property: nSTL - normal incidence sound transmission loss (dB)
Tested frequency range
- Small impedance tube (29 mm diameter) : 500 to 6 000 Hz
- Medium impedance tube (44.5 mm diameter): 300 to 4 100 Hz
- Large impedance tube (100 mm diameter): 50 to 1 600 Hz.
[2] Y. Salissou and R. Panneton, "Three-microphone method for measuring the normal sound transmission loss of noise control samples in standing wave tube ," Accepted for publication in J. Acoust. Soc. Am. (2010).