Study on Objective Evaluation Methods of Speech Intelligibility

-Focusing on Segmentation of Mora Boundary-

Abstract

Speech intelligibility is also an index of severity in dysarthia and its evaluation is important. However it is judged only by the auditory impression evaluation of the degree to which a listener understands the speech. The purpose of this study is to provide a method of assessing articulation and speech intelligibility more objectively not only in read speech but also in spontaneous speech. We proposes "non-segmented mora boundary ratio" (an appearance frequency of mora boundaries that are not segmented clearly on the spectrograms). This analysis method, which focuses on the segmentation of mora boundaries, can quantify the imprecise consonants and speech intelligibility in spontaneous speech.