Abstract

Basically this diploma thesis is divided in two major parts. The first one aims at the accurate determination of the sound field in the TU Graz reverberation room. Therefore, extensive measurements were made on the one side, and on the other, a computer aided simulation was taken into account. Background for this part is the norm EN 20354, which describes the procedure of measuring (absorption coefficients) in reverberation rooms. The requirements of that norm are theoretically derived and verified. As a result, methods are proposed, which allow measurements that overcome limitations such as the lower critical frequency.

The second part deals with micro-perforated foil-absorbers. After the derivation of the theory for such sound absorbing materials, the accomplished measurements, namely an one-layered configuration, a so called ‘sandwich’-configuration (multiple layers) or also a configuration with non-constant spacing between foil and wall, are measured and evaluated.

Full Text and additional Material

You can download the full version of the diploma thesis here.

Notice

As in 2011 the Acoustics and Audio Group moved from the Institute of Broadband Communications (IBK) to the Signal Processing and Speech Communications Laboratory (SPSC), the puplishing location of this thesis also was transfered from the IBK to the SPSC-website.