The Lab is equipped with a sound-proof recording booth and state-of-the-art digital recorders and microphones.
The Lab also has dedicated equipment for articulatory data acquisition.
Ultrasound tongue imaging
Ultrasound tongue imaging (UTI) is a technique which captures dynamic tongue contours using ultrasonography. It is a non-invasive technique and it produces real-time data of tongue gestures. Ultrasound tongue imaging is useful for collecting static articulatory information about vocalic and consonant gestures. A dynamic analysis of the gestures is also possible, such as the assessment of tongue displacement and velocity through time.
The lab has recently acquired a Telemed Echo Blaster 128 unit, paired with a 20mm transducer, which allows acquisition at a frame rate of 65 frames per second.
Electroglottography (EGG) measures the amount of contact between the vocal folds during phonation (Vocal Folds Contact Area, VFCA). The lab has a Laryngograph and a Glottal Enterprises EGG unit. From EGG data is possible to extract, among other things, exact information on fundamental frequency (F0) and voice quality.
Electropalatography (EPG) is an articulatory imaging technique that records contact between the tongue and the palate during speech. Articulate palates have 64 electrodes (in 8 rows) which are exposed to the lingual surface. The electrodes on the palate are connected to an electronics unit, which collect data from the palate when contact occurs between the tongue surface and any of the electrodes.
EPG provides dynamic real-time visual feedback of the location and timing of tongue contacts with the hard palate, and it gives insights on how consonantal gestures are achieved.
The lab has a PCquirer 516 unit which can measure the airflow and air pressure during speech. The airflow machine can record the pressure and the volume of the air escaping from the the mouth and from the nose. Such technique allows a quantitative investigation of nasality.
The following software is available for use in the Lab (training and support is provided):
- Audacity (recording and audio editing)
- Praat (acoustic analysis)
- R (statistics)
- RStudio (statistics)
- Articulate Assistant Advanced™ (ultrasound data processing)
- FAVE (force alignment for English)
- SPPAS (force alignment, supports several languages)
- ELAN (audio and video annotation)
- SIL Toolbox (morphological parsing)
- SIL FLEx (morphological parsing)
- SIL Lexique Pro (interactive lexicon viewer and editor)