Sound Transmission Class STC

Program calculates Sound Transmission Class (STC) from transmission loss data.

This is an implementation of the calculation of STC value according to ASTM E 413-04. Classification for Rating Sound Insulation.

Input the transmission loss in one third octave bands (dB) and enter the frequency bands and the program will calculate the STC value and produce a graph.

The center frequencies do not have to be exact as the program matches them to the reference contour and applies a tolerance.