First ISCA ITRW on Auditory Quality of Systems

April 23-25, 2003
Akademie Mont-Cenis, Germany

Spatial Distribution of Reflections Affects Auditory Quality and Character of Speech Sounds Located in a Virtual Acoustic Environment

William L. Martens (1), Nick Zacharov (2)

(1) Multimedia Systems Lab, University of Aizu, Aizu-Wakamatsu, Japan
(2) Nokia Research Center, Speech and Audio Systems Laboratory, Tampere, Finland

This study examined the significant multidimensional perceptual differences that exist between speech samples that were spatially processed using a virtual acoustic simulation with varying spatial and temporal distribution of reflections. The experiments reported here were designed to explore the stimulus similarity structure (i.e., the perceptual space) associated with a set of spatialized speech samples, reproduced via headphones under controlled conditions. The indirect sound simulation allowed the temporal distribution of reflections to be held constant while varying spatial distribution, so that the relative contribution of these two aspects of the indirect sound could be determined. Furthermore, an attempt was made to identify the perceptual dimensions that characterize the set of experimental stimuli via direct attribute ratings and binary choices. Finally, the auditory quality of the stimuli was investigated via a pairwise preference choice task completed by 75 individual listeners.

Full Paper

Bibliographic reference.  Martens, William L. / Zacharov, Nick (2003): "Spatial distribution of reflections affects auditory quality and character of speech sounds located in a virtual acoustic environment", In AQS-2003, 91-96.