A Binaural 3D Sound System Applied to Moving Sources

Diploma thesis (13.000 KB pdf)

This master thesis deals with the problem of generating binaural signals for moving sources in closed or in open environments. For this purpose a simulation programm will be developed, composed of three main parts: propagation, reverberation and the effect of the head, torso and shoulders. For propagation the effect of attenuations (e.g. distance, absorption), velocity profiles in the atmosphere, the Doppler Effect, etc. will be considered. The interaction of the sounds with the environment, especially in closed ones, leads to reverberation. In this part of the work we will design filters for early and late reverberation. The effects of the head, torso and shoulders on the signals, which arrive the listener are also object of consideration. Head-related transfer functions (HRTF) of manikins and real listeners are used. Particulary, an interest is shown in HRTFs interpolation for the generation of those transfer functions, which are not available in the database (KEMAR, CIPIC etc.). Some other aspects like the definition of trajectories, the inclusion of several sources, the interaction with particular occluding objects, etc. will also be considered in the simulations so that we can achieve realistic binaural renderings. The evaluation will be implemented in MATLAB.