Subjective evaluation experiment on distance attenuation model of human voice for six-degree of freedom content

To enhance the immersive experience of six-degree of freedom (6DoF) content, we previously proposed a distance attenuation model of the human voice - referred to as the head model - that incorporates direction-dependent head diffraction and radiation point on the basis of measurement of human utterances. In this study, we conducted a subjective evaluation experiment to verify the perceptual validity and practical applicability of the proposed head model in content production. The results suggested that the head model tends to represent the distance attenuation of the human voice under various directional and distance conditions more accurately than the conventional model. Furthermore, listeners generally did not report perceptible differences between the voice to which the head model was applied and the measured voice. These findings indicate that the head model is perceptually suitable for use in 6DoF content.