STUDY ON THE POSSIBILITIES TO APPLY SPECTRUMINDEX
Possibilities to apply spectrumindex in building acoustics are studied. Spectrumindex refers to the difference of two sound pressure levels caused by the same sound field and measured using two separate frequency weightings. The purpose of the study is to develop a simple method in which one can apply the spectrumindex to evaluate the traffic noise reduction indices existing already in a NORDTEST-method. Some difficulties in that method, i.e. its definitions, used spectra and the extensive data material, are discussed, too. Further, the spectrumindex principle has been applied to a test material of 20 different windows. It has been shown, that by accepting some little limitations concerning the noise spectra and magnitude of spectrumindex, one can get very reliable estimation results.
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