The evaluation of voice quality via signal typing in voice using narrowband spectrogramsThe evaluation of voice quality via signal typing in voice using narrowband spectrograms
Faculty of Medicine and Health Sciences
Laryngo-Rhino-Otologie. - Stuttgart
95(2016):2, p. 105-111
University of Antwerp
Objective: Traditionally, voice quality is evaluated by auditory-perceptual judgment but objective-acoustic analyses are also valid tools. Spectrography is a part of objective-acoustic analyses and is used since around 50 years. Recently, Sprecher et al. (2010) designed a new classification scheme for signal typing in voice using narrowband spectrograms. The present study aimed to explore the external validation between these 2 methods in a larger dataset. Materials and Methods: In total 300 voice samples were used based on the vowel [a:], in which n = 270 had various degrees of dysphonia and n = 30 were vocally normal. All voice samples were evaluated by 7 speech-language therapists using the RBH-scale and 2 judges analyzed the signal typing in voice using narrowband spectrograms. Results: The intra-and inter-rater reliability of all RBH parameters was fair in average (kappa = 0.234-0.383) but the rater reliability was moderate between the 2 judges rating signal typing in voice (kappa = 0.457). A strong concurrent validity was identified between the signal typing in voice using narrowband spectrograms and auditory-perceptual judgment of hoarseness and breathiness (H: r = 0.746, p = 0.000; B: r = 0.746, p = 0.000) but only fair in roughness (r = 0.370, p = 0.000). Conclusion: The present results confirmed the results of Sprecher et al. (2010) and it might be meaningful to benefit signal typing in voice using narrowband spectrograms on sustained vowels as a valid complement in the evaluation of hoarseness and breathiness for clinical utility and research.