Abstract

This thesis deals with the construction of a four-microphone impedance tube as an extension of an existing two-microphone impedance tube. Besides the acoustic parameters reflection factor, absorption coefficient, acoustic impedance and admittance, which are determined with the transfer function method using the two-microphone impedance tube, also the transmission factor and the transmission loss of acoustic absorbers can be determined using the transfer matrix method.

The theory of the transfer-function-method and the transfer matrix method is described and the resulting parameters are defined and explained.

When adapting the theory, there is a focus on the calibration of the measuring system.

Then, the hardware of the four-microphone impedance tube is presented, and the software development with the program and data structures are described in detail.

A description of the measuring system, which is written as a user manual and a few selected sample measurements for the evaluation of the measurement system is the completion of the work.

Full Text and additional Material

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

Disclaimer

The Institute of Broadband Communications joined the Signal Processing and Speech Communications Laboratory in 2011.
Therefor you will find diploma theses and student projects which were conducted at the Institute of Broadband Communications here at the SPSC.