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Göttingen hoarseness diagram
With the lingWAVES Göttingen Hoarseness Diagram (GHD), objective statements can be made about the vocal quality of a patient with regard to the noise component of the voice and the regular vibration behaviour of the vocal folds, both for individual vowels and generally for the average realisation of all vowels. This makes it possible to monitor the course of therapy and treatment. Today, the GHD is considered to be the closest objective approximation to the subjectively determined RBH index.
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GÖTTINGEN HOARSENESS DIAGRAM
Highly reliable and optimally evaluated measuring system
The Göttinger hoarseness diagram is a graphical representation of voice quality in the 2 dimensions ‘irregularity component’ (roughness) and ‘noise component’ (breathiness) developed by Dr Dirk Michaelis (Göttingen, 1999). For this purpose, the vocal irregularity component (IK) is determined with the aid of the 3 acoustic measures jitter (period length fluctuations), shimmer (energy fluctuations) and period correlation. The noise component (RK) of the vocal signal is determined by a GNE calculation (glottal to noise excitation ratio). The IK value is plotted horizontally on a scale from 0 (normal voice) to 10 (extremely pathological/rough voice), the RK value vertically on a scale from 0 (normal voice) to 5 (extremely pathological/noisy voice) in the GHD. The hoarseness diagram was evaluated with approx. 1,500 patient voices!
The Göttinger hoarseness diagram in lingWAVES: Horizontally, the IK value (irregularity component; correlates with perceived roughness) is plotted on a scale from 0 to 10 (0 => normal voice; 10 => extremely pathological/ rough voice). The RK value (noise component; correlates with perceived roughness) is plotted vertically on a scale from 0 to 5 (0 => normal voice; 5 => extremely pathological/ rough voice). The grey marked area represents a non-binding area of a normal voice according to a study by the University Hospital Göttingen. The upper right corner can then be assigned to an aphonic voice. There is a black circle in the diagram. For a normal voice, the circle is in the grey field. For a rather rough voice it will appear at the bottom right. And, for a rough and breathy voice the circle shows up at the top right.
Trend display: lingWAVES GHD now also shows the course of various sessions and thus the change in voice quality over time, which is used as a pre-post assessment for clinical evaluations.
Statistics: You can also view the values of the individual vowels and the average values in tabular form in detailed statistics and export them for further processing for scientific purposes.
What lingWAVES GHD offers
- Standardised measurement of the noise component of the voice and the vibration behaviour of the vocal folds
- Approximation of the RBH index (roughness, breathlessness, hoarseness)
- Objective comparability of voices for progress monitoring
- Detailed statistics
- Printout, storage and comparison of recordings
- Simple and intuitive operation
What lingWAVES GHD offers
- Standardised measurement of the noise component of the voice and the vibration behaviour of the vocal folds
- Approximation of the RBH index (roughness, breathlessness, hoarseness)
- Objective comparability of voices for progress monitoring
- Detailed statistics
- Printout, storage and comparison of recordings
- Simple and intuitive operation
