Final Thesis

Implementation of VBAP and DBAP with Evaluation using Measurements and Binaural Simulation Model

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Bachelor Thesis of Bassiri, Sina

To create an acoustic virtual reality with the best possible realistic perception of sound sources for a listener in a closed space, it is necessary to analyse the spatial sound in certain areas. In this thesis two methods are considered: Vector Base Amplitude Panning (VBAP) and Distance-Based Amplitude Panning (DBAP). Thesc techniques arc able to create virtual sound sources for a listener by controlling several speakers. Important cues like the Interaural Time Difference (ITD) and the Interaural Level Difference (ILD) together with the frequency spectrum are analysed and evaluated. This aspects will be investigated by looking at the head direction and at the movement of the virtual source. The aim of this bachelor thesis is to implement the methods VBAP and DBAP in MatLab and to write a corresponding test script which plays different sounds with different methods and sound source locations. These sounds are recorded by a dummy head and they are evaluated in terms of ITD, ILD and frequency spectrum within the test script. With existing recordings of Head Related Transfer Functions (HRTFs) of the dummy head the evaluation is accomplished. In addition there will be a comparison with an auditory model by Dietz, which represents a model of the human hearing. The dependence of the speaker positions and position in the head related coordinatesystem are very important for the perception of the sound source. The results for DBAP's evaluation were unfavourable. However, VBAP works for the greater part very solid.