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Correlation between post and element measurements of in-situ sound insulation over all barrier types

The two diagrams show the correlation between sound insulation measurements performed in front of a post and measurements performed in front of a noise barrier element. The analysis has been performed for the frequency range between 200 Hz and 5kHz and also considering the lower boundary variable. The formula of the linear regression is also shown in the diagrams. In this case the coefficient of the linear regression indicates a very good accordance between measurements performed in front of a post and measurements performed in front of a noise barrier element, showing that measurements at the post are generally 1 to 3 dB lower than measurements performed at the element.

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