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      Estimation of Phoneme-Specific HMM Topologies for the Automatic Recognition of Dysarthric Speech

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          Abstract

          Dysarthria is a frequently occurring motor speech disorder which can be caused by neurological trauma, cerebral palsy, or degenerative neurological diseases. Because dysarthria affects phonation, articulation, and prosody, spoken communication of dysarthric speakers gets seriously restricted, affecting their quality of life and confidence. Assistive technology has led to the development of speech applications to improve the spoken communication of dysarthric speakers. In this field, this paper presents an approach to improve the accuracy of HMM-based speech recognition systems. Because phonatory dysfunction is a main characteristic of dysarthric speech, the phonemes of a dysarthric speaker are affected at different levels. Thus, the approach consists in finding the most suitable type of HMM topology (Bakis, Ergodic) for each phoneme in the speaker's phonetic repertoire. The topology is further refined with a suitable number of states and Gaussian mixture components for acoustic modelling. This represents a difference when compared with studies where a single topology is assumed for all phonemes. Finding the suitable parameters (topology and mixtures components) is performed with a Genetic Algorithm (GA). Experiments with a well-known dysarthric speech database showed statistically significant improvements of the proposed approach when compared with the single topology approach, even for speakers with severe dysarthria.

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          Genetic algorithms in search, optimization, and machine learning

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            Differential Diagnostic Patterns of Dysarthria

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              Clusters of deviant speech dimensions in the dysarthrias.

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                Author and article information

                Journal
                Comput Math Methods Med
                Comput Math Methods Med
                CMMM
                Computational and Mathematical Methods in Medicine
                Hindawi Publishing Corporation
                1748-670X
                1748-6718
                2013
                8 October 2013
                : 2013
                : 297860
                Affiliations
                Technological University of the Mixteca, Road to Acatlima K.m. 2.5, Huajuapan de León, 69000 Oaxaca, OAX, Mexico
                Author notes
                *Santiago-Omar Caballero-Morales: scaballero@ 123456mixteco.utm.mx

                Academic Editor: Volkhard Helms

                Author information
                http://orcid.org/0000-0002-9986-7768
                Article
                10.1155/2013/297860
                3816031
                0ea7d253-491f-4c98-adde-b5bc0a3c3ff8
                Copyright © 2013 Santiago-Omar Caballero-Morales.

                This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 31 May 2013
                : 16 August 2013
                : 25 August 2013
                Categories
                Research Article

                Applied mathematics
                Applied mathematics

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