Abstract
IntroductionAcoustic evaluation of alaryngeal voices is among the most prominent issues in speech analysis field. In fact, many methods have been developed to date to substitute the classic perceptual evaluation. The Aim of this study is to present our experience in erygmophonic speech objective assessment and to discuss the most widely used methods of acoustic speech appraisal. through a prospective case-control study we have measured acoustic parameters of speech quality during one year of erygmophonic rehabilitation therapy of Moroccan laryngectomized patients.MethodsWe have assessed acoustic parameters of erygmophonic speech samples of eleven laryngectomized patients through the speech rehabilitation therapy. Acoustic parameters were obtained by perturbation analysis method and linear predictive coding algorithms also through the broadband spectrogram.ResultsUsing perturbation analysis methods, we have found erygmophonic voice to be significantly poorer than normal speech and it exhibits higher formant frequency values. However, erygmophonic voice shows also higher and extremely variable Error values that were greater than the acceptable level. And thus, live a doubt on the reliability of those analytic methods results.ConclusionAcoustic parameters for objective evaluation of alaryngeal voices should allow a reliable representation of the perceptual evaluation of the quality of speech. This requirement has not been fulfilled by the common methods used so far. Therefore, acoustical assessment of erygmophonic speech needs more investigations.
Highlights
Acoustic evaluation of alaryngeal voices is among the most prominent issues in speech analysis field
Rehabilitated erygmophonic speech exhibits acceptable to good perceptual qualities
We've concluded that none of the methods exposed above can thoroughly evaluate such aperiodic signal as the erygmophonic speech
Summary
Acoustic evaluation of alaryngeal voices is among the most prominent issues in speech analysis field. To the present, voice perceptual evaluation remains the essential way to assess the suitability of the objective appraisal of the quality of speech. The perturbation analysis methods that measure jitter and shimmer's values, the formant characterization of vowels production through linear predictive coding and the representation of the temporal evolution of the broadband spectrum of the speech signal called spectrogram [8,9,10,11].
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