Super Nasal-Oral Ratiometry System


Super Nasal-Oral Ratiometry System (SNORS)

SNORS detects nasal and oral airflow during speech to provide a non-invasive objective assessment of velopharyngeal dysfunction (VPD) . It uses a lightweight dual chamber mask that is held over the nose and mouth. A soft silicone cuff moulds to the contours of the face providing a comfortable air tight seal. Rapid response airflow sensors and microphones are contained in both the nasal and oral chambers of the mask to enable aerodynamic and acoustic analysis.

SNORS mask

Lightweight dual chamber mask separates nasal and oral signals
Soft silicone cuff moulds to the contours of the face providing a comfortable air tight seal
Fast response nasal and oral airflow sensors allow the rapid movements of the velum to be detected
Highly directional nasal and oral microphones record speech and enable acoustic analysis
Detects voiced and unvoiced sounds
Adult and child (4+) sizes available
Child mask available in a range of colours
Pink SNORS Mask Red SNORS Mask Orange SNORS Mask Yellow SNORS Mask Green SNORS Mask Blue SNORS Mask Purple SNORS Mask

SNORS unit

Quick release connector for interchangeable adult and child masks
Volume control enables optimised audio recording levels
Auxiliary channel allows data from other devices to be synchronously recorded
Connects to the host computer via USB
USB powered - no external power supply required

Compatible software

When used in combination with icSpeech Professional Edition, the following SNORS parameters are available:

Parameter Description
Nasal airflow Unfiltered nasal airflow signal
Nasal airflow intensity Low pass filtered nasal airflow envelope
Oral airflow Unfiltered oral airflow signal
Oral airflow intensity Low pass filtered oral airflow envelope
Combined airflow Combined nasal and oral airflow
Combined airflow intensity Low pass filtered combined airflow envelope
Aerodynamic nasalance Percentage of the total airflow that is nasal
Aerodynamic ratio Ratio of the difference between nasal and oral airflow to the total airflow
Nasal speech Nasal acoustic signal
Nasal speech intensity Low pass filtered nasal speech envelope
Oral speech Oral acoustic signal
Oral speech intensity Low pass filtered oral speech envelope
Speech Combined nasal and oral acoustic signal
Speech intensity Low pass filtered speech envelope
Pitch Derived from the combined acoustic signal
Acoustic nasalance Percentage of the total acoustic energy that is nasal
Auxiliary Signal derived from user defined auxiliary channel

Aerodynamic nasalance should not be confused with acoustic nasalance. Aerodynamic nasalance relates to the effective velopharyngeal closure, whereas acoustic nasalance relates to perceived nasality. Both parameters are useful and complementary.

There are a number of ways in which these parameters can be displayed. All displays can be synchronously viewed in real-time for biofeedback, recorded for off-line assessment or printed for hard copy.

Bar display

Real-time Bar display

The real-time Bar is a useful biofeedback tool that provides a clear and simple display reflecting the selected SNORS parameter. This allows the speaker to monitor their speech, make corrections, and instantly see the result. Real-time Bar is particularly useful when working with sustained sounds

Waveform displays

The real-time Waveform display allows the speaker to see the dynamics of their speech during the utterance of complete words or phrases.

Waveform Displays

Recording and analysis

Recordings enable precise, repeatable measurements to be performed on the recorded SNORS data. Measurements are made on the waveform display by positioning cursors over areas of interest. The data can also be exported to a comma-separated values (CSV) file for further manipulation.

Multiparameter data export


icSpeech Professional Edition contains six interactive speech therapy games. Each game features adjustable targets, rewards and can be controlled by the SNORS parameters.

Airflow games

System requirements

Operating Systems Windows 10, 8, 7, Vista or XP
CPU Minimum 1 GHz IntelĀ® PentiumĀ® or equivalent
Memory Minimum 1 GB of RAM
Storage 100 MB of free hard disk space
Software icSpeech Professional Edition
Connectivity USB 2.0
SNORS Package

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Package includes:

  • SNORS unit
  • SNORS mask (adult or child)
  • Locking USB cable
  • User manual
  • 12 months guarantee
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