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Articulation index used as a metrics to validate acoustic virtual reality

Abstract:

In this paper, a new approach to validate computer modeling auralizations by using articulation indexes is presented. The generation of acoustical virtual reality with the computer code RAIOS is briefly described. The code simulates the room acoustics, including specular and diffuse reflections, and a set of artificial neural networks provides the room's binaural impulse responses at selected points in the audience region. Then, these responses are convolved with anechoic signals containing monosyllable words to generate virtual acoustic articulation tests. Articulation indexes are also obtained by measuring the binaural impulse responses in the same positions in the room. Then, auralizations are produced by convolving the measured binaural impulse responses with the anechoic signals using equalized headphones. In the sequel, these auralizations are presented to the subjects in order to perform articulation tests. Finally, the computer modeling auralizations are also reproduced to the subjects, using the same headphones, and the obtained articulation index results are compared for validation purposes. The results show that the articulation index can be used as a metrics to evaluate acoustical virtual realities. Although the proposed metrics do not cover all auralization features, such as sound coloration, spaciality and sound localization, it is a first - and successful - attempt to establish a parameter to evaluate computer auralizations quality.