Glottal

OVERVIEW
SYSTEM COMPONENTS
HOW DO WE COMPARE TO OTHERS?
PICTURES

System Components

Includes:

A- Nasalance mask handle with electronics and USB connectivity
B- Set of 3 separator plates, Narrow, Medium and Wide fit
C- Multi User Nasalance Separator handle with electronics and USB connectivity
D- Nasal Emission mask handle with electronics and USB connectivity
E- Calibration verification tube
F- One OroNasal mask—adult
G- One OroNasal mask—child
• Nasalance software with manual
• Nasal Emission software with manual

This product is for research and teaching purposes only. It is not a medical device. It is not intended to be used in the diagnosis, cure, treatment, mitigation or prevention of disease and it is not intended to affect the structure or function of the body.

The NVS System

Detailed Features in PDF
The NVS allows the measurement of NasalanceNasalance is a measure of the degree of velopharyngeal opening in voiced speech formed by computing the ratio of the amplitude of acoustic energy at the nares, An, to the amplitudes of the total radiated acoustic energy, at the mouth and nose, Am +An. The term nasalance usually refers to this ratio as a percentage: An/(Am+An)X100 in vowels and Nasal Emission of airflow in pressure consonants. It combines the function of both the Nasal Emission and NasalanceNasalance is a measure of the degree of velopharyngeal opening in voiced speech formed by computing the ratio of the amplitude of acoustic energy at the nares, An, to the amplitudes of the total radiated acoustic energy, at the mouth and nose, Am +An. The term nasalance usually refers to this ratio as a percentage: An/(Am+An)X100 systems.

This system measures:

Nasal Emission: Measures and displays airflow through the nose during consonants requiring oral air pressure using the Glottal Enterprises OroNasalRelating to the mouth and nose CV Mask.

Nasalance: Non-invasivelyA non-invasive measurement is one that does not require the introduction of instruments into the body. provides data on velopharyngeal closure in vowels through a state-of-the-art implementation of the standard Nasalance measure, using a choice of OroNasalRelating to the mouth and nose CV Mask or a convenient separator handle.

Please see the Nasal Emission and Nasalance pages for more detailed information.

How Do We Compare To Others

FAQs

1. What are the relationships between the NAS system, the NEM system and the NVS system?

There are a number of ways that our systems for visualizing nasality can be purchased. The full Nasality Visualization System (NVS) includes the capability for measuring Nasal Emission (NEM-1, formerly NE-1) and the system for measuring nasalance (NAS-1 system). As part of the NVS system, the NAS-1 system has both the mask and partition options. (Nasal Emission measurement requires the mask.) There is a price advantage when purchasing the complete NVS system over purchasing the NAS-1 and NEM-1 separately.

2. How does the NEM system for recording nasal emission work? Is it accurate enough for research applications?

The NEM-1 system uses the standard Glottal Enterprises dual-chamber (OroNasal) mask to isolate nasal airflow. The flow rate is measured by a transducer mounted in the mask handle, as is the acoustic signal. The software records and displays both signals simultaneously and they are superimposed on the screen in a chart display. (See the dual-chamber mask and a typical screen at https://www.glottal.com/Products/NVS.htm#NE1.) Average values of NE and SPL can be obtained for a chosen speech segment. You definitely can do research measuring nasal emission with the NEM-1. It is also useful in speech training tasks.

3. Can the so-called SNAP test (Simplified Nasometric Assessment Procedure, as described by Ann W. Kummer in Cleft Palate and Craniofacial Anomalies, Singular Press, 2001) be used with the NAS-1 system?

The SNAP test or its equivalent can be used on any device for displaying nasalance, including ours.

4. Can systems for measuring nasalance be used for measuring nasal emission in pressure consonants?

No. If a manufacturer claims that its nasalance system does measure nasal emission, it is a misstatement

5. Can a system for measuring nasal emission in pressure consonants also measure nasal airflow in vowels?

Yes, though perhaps not as conveniently as with a system measuring naslance.

Pictures