Time-series evaluation of the sense of presence in audio content
Kenji Ozawa, Shota Tsukahara, Yuichiro Kinoshita, Masanori Morise · The Journal of the Acoustical Society of America · 2013
The authors have been making an effort to clarify the property of the sense of presence because this sense can be crucial for evaluating audio equipments. In our previous studies, the overall evaluation of presence was conducted for a set of audio content items, i.e., the subjects were asked to evaluate the presence of a whole content item. In this study, time-series evaluation of the sense of presence was conducted using the method of continuous judgment by category. Stimuli were 40 binaural content items with duration of approximately 30 s. They were recorded with a dummy head and presented to subjects via headphones. Twenty subjects judged the sense of presence for every moment during the presentation of each item using seven categories by pressing one of seven keys on a keyboard. After the time-series evaluation, the subjects also evaluated the overall presence of the item by seven categories. The results showed that the overall presence was highly correlated with the five-percentile exceeded presence level, which is the level exceeded for the 5% of the time under consideration. Moreover, the latency of the evaluation tended to be longer when the presence of an item was low. [Work supported by NICT.]