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Observations on Bimodal Audio Visual Subjective Assessments of a Virtual 3D Scene

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This article deals with observations made during audio visual subjective assessments of perceived overall quality of a virtual 3D scene. Over 30 test subjects were individually presented with a virtual living room. For each of them a pre-defined sequence of self-movement was displayed on a 2.7m wide projection screen. The visual impression was complemented with different versions of room acoustic real time simulations rendered audible via a circular 8 channel loudspeaker setup. These were contrasted in a pair-comparison test. Interestingly, the amount of reverberation judged by test subjects to be “most realistic” was highly dependent on the acoustic stimulus itself. In the following, we will present a number of interesting observations related to expectations of test subjects and gender, as well as an interpretation from which we can derive a number of suggestions for subsequent bimodal assessments.

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