Evaluation and analysis of coded speech quality
Takeshi Nakayama, Tohru Futagami, Keiji Takida, Kazuyuki Kodama, Zenshiro Kawasaki · Electronics and Communications in Japan (Part III Fundamental Electronic Science) · 1992
Abstract Rating scale data for evaluating coded speech quality by the mean opinion score (MOS) are factor‐analyzed to show the possibility of extracting rich information from them. Two factors, softness‐shrillness and clearness‐noisiness, are extracted. Factor scores expressing a kind of multidimensional scale of speech quality are related to several physical parameters of speech samples, e.g., differential spectral distortion, phase distortion, and dissonance. Individual subject differences in evaluating speech quality are extracted as the factor loadings. It is found also that speech specialists and nonspecialists place different weights on different factor axes.