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

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Organic Voice Disorders

remote support
WEVOSYS remote support

lingWAVES Voice Diagnostic Center (VDC) Set

karo lingWAVES module overview

VRPlingWAVES Voice Diagnostic Center was designed with the ultimate goal to combine for the first time the quantitative (singing/speaking profile) and qualitative (singer's formant, hoarseness – degree of dysphonia severity, roughness – irregularity, breathiness – noise) voice analysis. The VDC voice analysis delivers reliable and clinically relevant data, it can be performed in a short time and is optimized for use in everyday practice. Its integral design, usability and practical value are the key features that make the product unique. " Ingolf Franke, WEVOSYS

Voice Range Profile and Hoarseness

Let the pictures speak for lingWAVES VDC performance:

lingWAVES VDCCluster and Polygon Display: The phonetogram (voice range profile) display can be switched between cluster and polygon view mode.  Histograms displaying the distribution of occurence frequency of pitch and volume values contained in recorded data are placed on the left and lower sides of the phonetogram template. To the right of the phonetogram template, statistical information on the recorded data is given. One of the new and most useful features introduced with lingWAVES VDC is the relative voice area or norm profile coverage. The new measure gives the quotient of the  recorded phonetogram area to gender-specific normal value. Area covered by an individual phonetogram is a realiable measure for evaluating dysphonia and documenting changes in vocal ability. A healthy voice is supposed to cover at least 100 % of the normal phonetogram area.

lingWAVES VDCTwo-Profile Comparison: Two phonetograms overlayed: the comparison shows an increase in phonetogram area expressed in percent.

lingWAVES VDCPitch and Volume Dynamic Display: Apart from distribution of pitch and volume values, this display shows detailed information on changes in pitch and volume dynamic. We recommend comparison with other registrations to assess possible changes.

lingWAVES VDCIrregularity Display (Roughness Display): This diplay captures voice quality parameters related to vibrating behavior of vocal folds during phonetographic registration. Irregularity of vocal fold vibrations correlates with perceived roughness. Green areas represent regular vocal fold behavior, irregularity is highlighted by yellow and red colors for poor and pathological voice quality respectively.

lingWAVES VDCNoise Display (Breathiness Display): This display captures noise energy in the recorded data. Red areas are typical of voices with high noise ratio due to inclomplete glottal closure, noise correlating with perceived breathiness.

lingWAVE VDCDysphonia Severity Display (Hoarseness Display): Objective measurements of roughness and breathiness correlatives in a singing voice add up to pitch- and volume-dependent dysphonia severity display, overall degree of dysphonia severity strongly relates to percieved hoarseness.

lingWAVES VDCVocal Ring/Singer's Formant Display: This display captures the relative prominence of frequencies near 3kHz in a voice sample. The stronger the energy, the better the voice can be heard over other sound sources. The energy peak in this frequency band is commonly referred to as the singer's formant. lingWAVES VDC gives singer's formant estimates for each documented pitch and volume value and offers herewith an overall picture of voice strength for soft, comfortable and loud phonations depending on pitch. This display is invaluable in singing instruction.

lingWAVES VDCSpeaking profile including shouting voice: lingWAVES VDC introduces a new measure describing the rise of pitch with increasing volume, the slope of speaking curve. The slope of speaking curve should show a steep rise for a healthy voice.

lingWAVES VDCTwo-Profile Comparison: Voice parameters extracted from one recorded profile can be cross-compared to other profiles. Positive or negative changes are highlighted by green and red colors respectively, the upper picture showing two slopes of speaking curve. The change in the steepness of the slope indicates improvement against previous voice condition.

lingWAVES VDCVospector-DSI: An objective RBH measurement is taken on a vowel [a] that has to be sustained for at least 2-3 seconds. The analysis data is available for further measurements, eg. for the calculation of the DSI.

lingWAVES sound level meterlingWAVES VDC recording

A sound level meter only can estimate the true, real value of sound intensity needed for phonetography and other analysis. lingWAVES phonetograms reach an optimal level of standardization and comparability of measurements that is unattainable by other systems.

The lingWAVES VDC is a combined analysis tool for the measurement of quantitative (singing / voice range profile) and qualitative voice parameters (vocal ring / singer’s formant, hoarseness / overall severity of dysphonia, roughness / irregularity, breathiness / noise). The lingWAVES VDC is a time-saving analysis solution that provides reliable, professional results. Therefore, it is especially suitable to fulfill the requirements of frequent use in everyday practice. The combination of an integrated analysis concept with an easy application and a high practical value is the unique key feature of this product.

Otolaryngology, ENT, Phoniatrics, Voice Clinic

The lingWAVES VDC is an optimized application for professional documentation and diagnostics of voice disorders. Besides standard diagnostics, it offers a great variety of other well-known and novel analysis options that are all easy-to-use, time-saving and cross-comparable as well. The lingWAVES VDC is THE solution for voice diagnostics and highly suitable for specialised usage in the fields of Oto­rhino­laryngo­logy, phoniatrics and clinical speech pathology. lingWAVES offers a standardized documentation that is very important for evidence-based-practice.

Voice Professionals

Especially for singers, actors and other voice professionals a decrease in voice performance may have serious consequences. Generally, a dysfunction or loss of voice may cause severe problems for all groups of patients, as voice represents an important “organ of expression”. The voice range profile and the hoarseness profile analyze and illustrate the limits of a vocal performance. The lingWAVES VDC supports you in diagnostics of functional voice disorders, suggests starting points for a voice treatment and can be used for the control of therapy effectiveness.

Voice Diagnostic for everyday use

New, informative, simpler than before – it takes 5 to 15 minutes to complete a singing and speaking profile and read off information on qualitative properties of the examined voice.


Vospector-DSI-calculation is an integral part of phonetography with lingWAVES VDC. The Dysphonia Severity Index is calculated on the basis of a combination of phonetographic data, maximal phonation time and further voice quality measurements made on a sustained vowel. Objective correlatives of the RBH voice quality ratings complement the DSI value.

Editing and Managing Data

With lingWAVES you can edit audio files as you desire by cutting, copying and pasting, e.g. if you want to remove artifacts or pauses from a signal or if you want to rearrange the order of signal parts. The undo-function is helpful in stepwise undoing changes.

The Patient Manager facility accommodates recorded data and analyses. It gives you fast access to patients' records and an advantage of low-maintenance data management.

Vocal Loading Test

lingWAVES VDC set includes a vocal loading test to facilitate expert opinion on patients' predisposition to vocal fatigue. The test parameters including level of vocal loading, loading tasks, test duration and volume can be chosen freely in accordance with the requirements of the situation.

Spectrography and Real-time spectrography

The spectral analysis of voice has been reliably used for years in voice diagnostics. Using lingWAVES VDC set you can perform spectrographic analysis of recorded speech and voice samples and display the spectrum of voice in real time.

The lingWAVES spectrogram module shows the distribution of frequencies over time in a recorded voice signal. The third dimension, energy, is presented by colour or darkness. Spectrograms are visual representations of an acoustic signal and contain cues on speech rate, duration, intonation, stress, voice onset, noise, place and manner of articulation, etc.

Measurements made with High-Quality Precision

Due to technical limitations, precise phonetography is not possible with common soundcards and microphones. lingWAVES Voice Diagnostic Center requires a standardized sound level meter (SPL), a device for frequency-weighted sound pressure level measurements displayed in dB(A). An SPL meter is a high-quality microphone, which can be easily connected to a PC through a free USB port and is automatically configured by the software.

Network-compatibility & data exchange port

lingWAVES can be set up to exchage data between work places using the lingWAVES Viewer. This exchange is needed when an examiner makes and evaluates phonetogram registrations on separate locations, e.g. audiometry room and consultation room. The second location is equipped with the lingWAVES Viewer, which is available as an optional accessory.

An optional data exchange port connects lingWAVES to your patient data management software according to the standards of the Berlin Association of Statutory Health Insurance Physicians.

At a Glance

lingWAVES Voice Diagnostic Center set:

System Requirements

karo lingWAVES module overview