Abstract

This work deals with the feasibility of a stereophonic microphone, combining the advantages of acoustic baffles and boundary layer microphones, and allowing high-quality recordings for the reproduction over loudspeakers in an easy and optically unobtrusive way. In the context of exemplary measurements it is clarified if it is possible to transfer existing acoustic baffles to boundary layer operation. Based on the results of test measurements, psychoacoustic principles and a preliminary test as well as on the basis of calculations for time-of-arrival stereophony and intensity stereophony possible prototypes are constructed and evaluated. The work also shows that frequency responses and the localization function of acoustic-baffle-microphones can be improved by active equalization as well as typical artifacts originating in the size of the acoustic baffles can be reduced.

It is checked whether conventional small-diaphragm microphones, as used in recording studios, are suitable as transducers for acoustic-baffel-boundary-layer-stereo-microphones, which qualities the microphone capsules need, and how these can be realized. For this purpose arrays made of electret condenser capsules are also tested.

The area of application and the practical issues of such Microphone Systems are examined. To this end test recordings and measurements are used, for which a measurement environment and an equalization-tool are realized.

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.