For this immersion test, Veli used dearVR UNITY since it was the highest-rated plugin in the previous test. He conducted further research to find out how much a spatializer plugin influences the perceived immersion within a VR project compared to non-spatialized audio. Fortunately, Veli collected a total of 98 answers of which 78 were usable in the end. Room simulations, reverbs and different tone colorations like equalization were disabled during the experiments. Since all the examined plugins differ from each other in their respective features, the test focused on the spatializing aspect only. The test played the 3D sound locations in random order, and a multiple-choice grid gathered the answers. They were able to choose from six different directions in order to properly complete the “direction test”. In the second experiment, the “direction test,” all the participants were asked to choose the perceived location of the audio information within the 3D space. After listening to the audio scene, he asked the participant to rate the directional quality of sounds being emitted from left/right, front/back, above/below, as well as the overall sonic quality of the audio scene. In the first experiment, Veli created an audio scene in which a moving virtual sound source circled the listener. He divided the test into two experiments in which every participant used the same audio material. To gather as much data as possible, Veli chose an online test in which he asked the participants to listen to each different audio spatializer plugin using their headphones as well as to evaluate the perceived directional precision. His list consisted of the following companies and products: Finally, he put together a list of six different companies to compare their products within his empirical investigation. Other determining factors included: a focus on direct and easy availability, proper customer support and frequent updates. He started his research by searching for alternatives to the default built-in Unity plugin by Oculus. To find the best 3D audio spatializer, he conducted an empirical online test in which he asked the following question: “In terms of perceived directional precision, what is the most highly rated audio spatializer-plugin, and how much can its usage increase immersion when compared to non-spatialized audio?” While working on his project, Veli also came across the problem mentioned above.
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