Modern international standard for speech and voice as­ses­sment, docu­men­ta­tion and bio­feedback

lingWAVES Catalog 2018

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lingWAVES Nasality

Voice Pro­to­col
lingWAVES Voice Protocol

lingWAVES China
中文版本可用 China

Reference of
Organic Voice Disorders

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WEVOSYS remote support

lingWAVES Goettingen Hoarseness Diagram

karo lingWAVES module overview


Voice pathologies require a multidimensional diagnostics. Hoarseness as a common symptom of dysphonia contains the parameters of breathiness and roughness. Acoustic analysis of the voice by means of the well evaluated Goettingen Hoarseness Diagram (GHD) is commonly used and enables to quantitatively describe the periodicity (roughness) and the noise content (breathiness) of voices. Voice groups with defined phonation mechanisms can be localized within the diagram and changes in voice quality during treatment can be tracked over time. With more than 1.500 recordings of clients with normal and pathological voices GHD is one of the best evaluated and most reliable voice assessment tool available on the market. Read more scientific details ... .

lingWAVES Goettingen Hoarseness Diagram (GHD)

lingWAVES GHD is now available as a tool made for clinical and scientific use. In combination with lingWAVES technology and client management a GHD can be performed easily and voice changes can be shown and documented over time. For the GHD measurement, the vowel sequence “[e], [a], [e], [i], [o], [u], [e]” need to be recorded in a row in different pitches.

The Goettingen Hoarseness Diagram in lingWAVES. Horizontal axis: IC value (irregularity component; correlate of perceived roughness) on a scale from 0 to 10 (0=> “normal” voice; 10=> pathologic/rough voice). Vertical axis: NC value (noise component; correlating to perceived breathiness) on a scale from 0 to 5 (0=> “normal” voice; 10=> pathologic/breathy voice). The Grey marker represents the GHD range of the “normal” voice. Accordingly, the section in the right upper corner of the diagram can be allocated to the aphonic voice.

Path of Voice Recovery

The GHD trend window shows main analysis results in time line. Left top: path of voice recovery, left bottom: time line for irregularity and noise, right top: jitter and shimmer time line, right bottom: GNE and fundamental frequency (pitch) time line. Results can be printed out for client file - see a printout sample.

Detailed Statistics

The GHD statistic window shows analysis results for each recording. Analysis data can be exported for further scientific work.

Differences to Jitter, Shimmer and CPP

Studies have shown that jitter, shimmer and other traditional acoustical parameters are not specific to perceptual attributes of voice and less useful for clinical documentation.

See recent findings: M. Brockmann-Bauser, M.J. Drinnan, P.N. Carding : Are Jitter and Shimmer comparable to perceptual voice analysis in healty voice? . read full article ...

CPP analysis shows greater levels of correlation with overall dysphonia, breathiness, and asthenia ratings than the other acoustic measures (jitter and shimmer), but no correlation in case of roughness. Different studies shows that CPP correlation with overall dysphonia seems to be more breathiness based.

GHD provides reliable analysis for both, breathiness AND roughness!

At a Glance


lingWAVES GHD is included in lingWAVES Voice Clinic Suite Pro and is also available as upgrade for other suites.

System Requirements

karo lingWAVES module overview