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On the harmonic-to-noise ratio as an acoustic cue of vocal timbre of Parkinson speakers

par Kacha, Abdellah ;Mertens, Christophe ;Grenez, Francis ;Skodda, Sabine;Schoentgen, Jean
Référence Biomedical Signal Processing and Control, 37, page (32-38)
Publication Publié, 2017

Article révisé par les pairs

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Résumé :

The relevance of the harmonic-to-noise ratio (HNR) and glottal cycle length jitter as cues of the vocaltimbre of Parkinson speakers is investigated. HNR and vocal cycle length jitter are known to be suitablecues for the evaluation of the vocal timbre of dysphonic speakers. However, the question whether theyare relevant descriptors of the voice quality of Parkinson speakers is still unanswered. Empirical modedecomposition (EMD) has been used to estimate the HNR by decomposing the log-magnitude spectrum ofthe speech signal into its harmonic, contour and noise components. Cycle length jitter has been estimatedvia the break-up by empirical mode decomposition of the cycle length time series into the intonationcontour as well as the perturbations owing to tremor and jitter. HNR and cycle length jitter values ofvowels [a] sustained by 205 Parkinson and 74 control speakers are in the same interval respectively andthe differences are not statistically significant. Also, the standard deviations of the per-frame HNR valuesof an utterance do not differ statistically significantly between control and Parkinson speakers.