Pilot study on the influence of spatial resolution of human voice directivity on speech perception (en)

* Presenting author
Day / Time: 08.03.2023, 09:40-10:00
Room: Saal X11-12
Typ: Regulärer Vortrag
Abstract: A perceptual threshold related to spatial resolution of the human voice directivity was determined through a listening test of similarity (MUSHRA) over 27 participants. Directivity data of an artificial talking head measured at high spatial resolution (spherical harmonics of order 35) was processed to obtain data at various spatial resolution steps (spherical harmonics of orders 1, 2, 3, 4, 5, 6, 7 and 10). The directivity data was then used as input of a room acoustics simulation software (RAVEN) to build sound stimuli in various room acoustic conditions (reverberant or dry) and source–receiver arrangements (different angles), with different voices (male, female). Results showed that, at spherical harmonics order 8 and above, the voice signal was not anymore perceived as significantly different from the greatest resolution. In addition, general trends related to the effect of gender, head orientation, and room acoustics on the threshold were found. A simple analytical predictive model was proposed and showed that the perceived degradation of speech spatial rendering follows a logarithmic relationship with the spherical harmonics orders.


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