The Wave electromagnetic articulograph speech research system measures the 3D position of micro sensors attached to the tongue, palate, lips and face for tracking orofacial movements. The resulting measurement data can be applied in the research of apraxia of speech, dysarthria, oral myofunctional disorders, and other speech-related pathologies.

The Wave can simultaneously track up to 16 disposable sensors in five degrees of freedom (5DOF); up to 8 sensors in 6DOF. Measurements are captured in real time without requiring a line of sight between the system and subject. Two subjects can be tracked at once, allowing for the study of dyadic communication, with the results displayed side-by-side in the software interface. High temporal accuracy and spatial resolution ensure the fastest and most subtle of movements are recorded.

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Electromagnetic Articulography: measuring movements of the tongue, jaws and lips during speech



Wave Features

  • Minimal lag and noise result in exceptionally accurate data
  • No line of sight requirements ensures uninterrupted 5DOF/6DOF tracking
  • No post-processing of kinematic data reduces experiment time and errors
  • Disposable micro sensors allow for natural subject movement
  • Real-time synchronization of audio and kinematic data

Optical Synchronization Option

As an additional option, the Wave Speech Research System can be spatially and temporally synchronized with the Optotrak Certus and 3D Investigator motion capture systems to enable greater power and flexibility within research applications. Integrating a Northern Digital Inc. motion capture system offers the following benefits:

  • Measure up to 512 data points
  • Integrate and synchronize with additional research equipment

Brochure Download

For more information, download our product brochure.

Download Wave Brochure


Wavefront Software

The Wave system includes the NDI WaveFront software for collecting and processing measurement data. Software features include:

  • Absolute or relative measurements captured
  • Customizable 3D view of sensor position and orientation
  • Dual-subject tracking displayed side-by-side
  • Sensors can be configured on the fly during data collection
  • Automatically creates ASCII data files
  • Ability to define the offset distance of any probe tip
  • Integrated playback of kinematic data
  • Plug and play functionality – no setup calibration required

Real-Time Application Development Software is also available, which includes an integrated TCP/IP server for real-time data streaming to third-party clients, and gives users the ability to create start/stop trigger commands from third-party clients.


Technical Specifications

System Performance
Static positional accuracy 0.6 mm RMS
Static angular accuracy 0.2 degrees RMS
Dynamic positional accuracy 1.5 mm RMS
Dynamic angular accuracy 0.6 degrees RMS
Number of sensors tracked simultaneously 8 – using 8 channel system; 16 – with extension package
Sample Frequency 100 Hz (Standard)
200 Hz, 400 Hz (Optimal)
Field Generator
Dimensions (H x W x D) 200 mm x 200 mm x 80 mm
Weight 3.2 kg
System Control Unit
Dimensions (H x W x D) 88 mm x 235 mm x 295 mm
Weight 3.4 kg
Sensor Interface Unit
Dimensions (H x W x D) 32 mm x 50 mm x 90 mm
Weight 250 g




The following options are available for use with the Wave Speech Research System.

Unique Sensors in Variable Styles
Different sensors are available to meet the unique needs of each application. Features of the various sensor options include:

  • Low cost
  • Ultra-small
  • Disposable
  • High accuracy
  • Self-calibrating
  • Ideal for tongue tracking
  • Track up to 16 sensors simultaneously

Micro Sensors

  • Ideal for tracking 3D locations and angular measurements of points of interest
  • Ultra-small 3 mm square
  • Reports X-Y-Z location in real-time
  • Reports roll and pitch in real-time

Reference Sensor

  • Ideal for creating local coordinate systems or local reference points
  • Ultra-small; uses two 3 mm sensors
  • Corrects for head movement
  • Reports X-Y-Z location of in real-time
  • Reports roll, pitch and yaw in real-time