REPORT Fritsch_Idiap-RR-01-2021/IDIAP Probabilistic Symbol Sequence Matching and its Application to Pathological Speech Intelligibility Assessment Fritsch, Julian Quer, Guillem Magimai.-Doss, Mathew Objective intelligibility Assessment Pathological speech Posterior features String matching EXTERNAL http://publications.idiap.ch/attachments/reports/2020/Fritsch_Idiap-RR-01-2021.pdf PUBLIC Idiap-RR-01-2021 2021 Idiap January 2021 Matching of a test signal to a reference word hypothesis forms the core of many speech processing problems, including objective speech intelligibility assessment. This paper first shows that the comparison of two speech signals can be formulated as matching of two sequences of "uncertain" or probabilistic latent symbols, in the same manner as string matching. Based upon that, we propose a pathological speech intelligibility assessment approach that compares pathological speaker's speech to control speaker's speech in phone space and articulatory feature space, and yields a score that is interpretable w.r.t. human listening test. Experimental validation of the proposed approach on the UA-speech corpus yielded a Spearman's correlation coefficient of 0.976 and a Pearson's correlation coefficient of 0.946.