Characterization of current codecs degradations for subjective assessment of speech quality

Our work aims to provide reference signals representative of the new techniques of speech coding, for subjective assessment tests of speech quality. At first, we determine a four-dimensional perceptive space of the degradations resulting from 20 wideband codecs. Then, from a verbalization task, it appears that the identified attributes are clear/muffle, background noise, noise on speech and hiss. Finally, these dimensions are characterized with correlates such as spectral centroid, power spectrum for the period of silence, Mean Opinion Score and correlation coefficient.