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The quantitative evaluation of hoarseness
Archives of Otolaryngology (Chicago, Ill. : 1960)
|January 1, 1983
Summary
The harmonics to noise (H/N) ratio quantifies hoarseness by measuring the relationship between harmonic structure and noise in voice spectrograms. This simple, computer-aided measure effectively assesses hoarseness and treatment outcomes.
Area of Science:
- Laryngology
- Acoustic analysis
- Speech science
Background:
- Hoarseness involves increased noise replacing harmonic structure in voice.
- Quantifying this change is crucial for objective voice assessment.
Purpose of the Study:
- To introduce and validate the harmonics to noise (H/N) ratio as a measure of hoarseness.
- To demonstrate its utility in assessing treatment effectiveness.
Main Methods:
- Spectrographic analysis of sustained vowels.
- Calculation of the H/N ratio by averaging 50 consecutive pitch periods.
- Measuring harmonic energy (H) and noise energy (N).
Main Results:
- The H/N ratio increases with greater hoarseness.
- The H/N ratio was successfully used to evaluate treatment efficacy for hoarseness.
- The computation is straightforward and feasible with inexpensive computer technology.
Conclusions:
- The H/N ratio is a valuable tool for objectively assessing hoarseness.
- It can effectively monitor the impact of interventions on voice quality.
- While not diagnostic for laryngeal abnormalities, it aids in hoarseness assessment.
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