Improved Estimation of Parkinsonian Vowel Quality through Acoustic Feature Assimilation

Figure 2

Waveforms and spectrograms of selected sustained vowels recordings from subjects in the database. (a, c) The waveform and the spectrogram for the sustained vowel “∖∖” collected from a normal control subject; (b, d) the waveform and the spectrogram for “∖∖” sustained vowel collected from a PD subject who has been off his medication. (a) Control subject waveform. (b) PD subject waveform. (c) Control subject, high quality. (d) Parkinsonian subject, poor quality.

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