Harmonics-to-noise ratio as an index of the degree of hoarseness

摘要: Degree of hoarseness can be evaluated by judging the extent to which noise replaces harmonic structure in spectrogram a sustained vowel. However, this visual method is subjective. The present study was undertaken develop harmonics‐to‐noise (H/N) ratio as an objective and quantitative evaluation degree hoarseness. computation conceptually straightforward; 50 consecutive pitch periods vowel /a/ are averaged; H energy averaged waveform, while N mean differences between individual waveform. Recordings 42 normal voices 41 samples with varying degrees were analyzed. Two experts rated each voice sample, based on amount relative that component. results showed highly significant agreement (the rank correlation coefficient = 0.849) H/N calculations subjective evaluations spectrograms. also proved useful quantitatively assessing treatment for