Avaliação de distúrbios laríngeos através da energia global do sinal de voz (Assessment of laryngeal disorders through the global energy of speech)

Marlice Fernandes (marliceffono@yahoo.com.br), Fernando Eduardo Resende Mattioli (mattioli.fernando@gmail.com), Edgard Afonso Lamounier (lamounier@ufu.br), Adriano Oliveira Andrade (aoandrade@yahoo.com.br)

Universidade Federal de Uberlândia
This paper appears in: Revista IEEE América Latina

Publication Date: Dec. 2011
Volume: 9,   Issue: 7 
ISSN: 1548-0992

Voice analysis is an important tool in the diagnosis of laryngeal disorders. Among distinct signal processing techniques employed for voice analysis, the spectrogram is commonly used, as it allows for a visualization of the variation of the energy of the signal as a function of both time and frequency. In this context, this study investigates the use of the global energy of the signal, estimated through the spectrogram, as a tool for discrimination between signals obtained from healthy and pathological subjects. This research has also exploited the potential use of the global energy of the voice signal to discriminate distinct laryngeal disorders. In total, 94 subjets were involved in this study, from which 46 were dysphonic and 48 normal. The diagnosis of laryngeal disorders was confirmed by means of a videolaryngoscopic examination. Participants were also subjected to a clinical examination of vocal acoustic through the recording of the sustained vowel /ɛ/. The global energy allowed for the discrimination between normal and disphonic voice. Furthermore, this technique could discriminate the voice signal of patients suffering from left vocal fold paralysis from those suffering from other investigated disorders. The results suggest the global energy of the signal as an auxiliary and alternative tool for the diagnosis between normal and dysphonic voice.

Index Terms:
Vocal and Laryngeal Disorders, Acoustic Analysis, Spectrogram, Global Energy   

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