Annals of Indian Academy of Neurology
: 2017  |  Volume : 20  |  Issue : 4  |  Page : 352--357

Speech signal analysis and pattern recognition in diagnosis of dysarthria

Minu George Thoppil1, C Santhosh Kumar2, Anand Kumar1, John Amose2 
1 Department of Neurology, AIMS, Kochi, Kerala; Department of Electronics and Communication Engineering, Amrita Vishwa Vidyapeetham University, Coimbatore, Tamil Nadu, India
2 Department of Electronics and Communication Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore, Tamil Nadu, India

Correspondence Address:
Minu George Thoppil
Department of Neurology, Renai Medicity, Kochi, Kerala

Background: Dysarthria refers to a group of disorders resulting from disturbances in muscular control over the speech mechanism due to damage of central or peripheral nervous system. There is wide subjective variability in assessment of dysarthria between different clinicians. In our study, we tried to identify a pattern among types of dysarthria by acoustic analysis and to prevent intersubject variability. Objectives: (1) Pattern recognition among types of dysarthria with software tool and to compare with normal subjects. (2) To assess the severity of dysarthria with software tool. Materials and Methods: Speech of seventy subjects were recorded, both normal subjects and the dysarthric patients who attended the outpatient department/admitted in AIMS. Speech waveforms were analyzed using Praat and MATHLAB toolkit. The pitch contour, formant variation, and speech duration of the extracted graphs were analyzed. Results: Study population included 25 normal subjects and 45 dysarthric patients. Dysarthric subjects included 24 patients with extrapyramidal dysarthria, 14 cases of spastic dysarthria, and 7 cases of ataxic dysarthria. Analysis of pitch of the study population showed a specific pattern in each type. F0 jitter was found in spastic dysarthria, pitch break with ataxic dysarthria, and pitch monotonicity with extrapyramidal dysarthria. By pattern recognition, we identified 19 cases in which one or more recognized patterns coexisted. There was a significant correlation between the severity of dysarthria and formant range. Conclusions: Specific patterns were identified for types of dysarthria so that this software tool will help clinicians to identify the types of dysarthria in a better way and could prevent intersubject variability. We also assessed the severity of dysarthria by formant range. Mixed dysarthria can be more common than clinically expected.

How to cite this article:
Thoppil MG, Kumar C S, Kumar A, Amose J. Speech signal analysis and pattern recognition in diagnosis of dysarthria.Ann Indian Acad Neurol 2017;20:352-357

How to cite this URL:
Thoppil MG, Kumar C S, Kumar A, Amose J. Speech signal analysis and pattern recognition in diagnosis of dysarthria. Ann Indian Acad Neurol [serial online] 2017 [cited 2022 Jan 21 ];20:352-357
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