By each type of material that is applied to the sound barrier to sound transmission loss (Sound Transmission Loss) or the value of different STL STL which is a defining sound transmission in each of the frequency of the tested material which has a frequency from 125-4000 for each type of material, which is combined with the ability to enter Greek.Nasiang passed on a different frequency. To find the average of a voice transmission in each individual frequency is sometimes the value tolerance, therefore, has been set up to measure the value of sound transmission to the closest value the fact that can be used in calculations. It is the Sound Transmission Class (STC values), which is divided by the standard classification of materials according to the ASTM E413 audio transmission or "Standard Classification for Determination of Sound Transmission Class" STC value is the value that represents the decrease volume from one deposit to another sound barrier fence of deposit. A unit is the decibel (dB) sound barrier fence of STC values greater that the fence is able to reduce sound transmission.
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