Voice Quality Measures Flashcards
(13 cards)
What is breathy voice?
Incomplete closure of the vocal folds
Acoustic properties of breathy voice
High frequency - aperiodic noise
The configuration and movement of the vocal folds (breathy voice)
Vocal folds are close enough to vibrate, but air escapes through the opening in the vocal folds
Why is breathy voice an inefficient form of phonation?
There is no complete seal of the vocal folds. Not solved efficiently/completely
Low subglottal pressure, high airflow
What is rough/hoarse voice?
Sound sounds raspy, low pitch, strained
Acoustic properties of rough/horse voice
Aperiodic vibration of the vocal folds -> extraneous noise
The configuration and movement of the vocal folds (rough/hoarse) voice
Disruption of mucosal wave, asymmetry and swelling of the VFs
Jitter
Measures cycle-to-cycle changes in period
Shimmer
Measures cycle-to-cycle changes in amplitude
Identify three factors that can cause cycle-to-cycle variations in vocal fold vibration in normal speakers
Vocal fold may be asymmetrical
Fluctuations in lung pressure
Air may become turbulent as it passes through the glottis
Identify three clinical conditions that have been associated with abnormally high levels of jitter and shimmer
Laryngeal cancer
Vocal fold paralysis
Parkinson’s disease
What task (method of elicitation) should you use to collect jitter and shimmer measures?
Perturbation-based measure
Define HNR
A ratio harmonic energy (periodic component) to noise energy (aperiodic component) in voice
Higher = better
Breathy/rough voice: lower HNR
