1. Separator Handle
Advantages for the
Measurement of Nasalance
• The separator is not
strapped to the head, as is
the case with competitive systems
• The removable separator plates are
easily changed to better fit the user’s face
• The removable plates can be easily
washed in a dishwasher or by hand
Dual Chamber
Mask
Advantages:
• Allows measurement of both vowel
Nasalance and Nasal Emission in
consonants
• Readings are more independent of
sensor orientation than with a partition.
• USB operation on any Windows
computer, with all electronics contained in
the handle
Glottal Enterprises gives you a choice
for NASOMETRY with the
Nasality Visualization System (NVS)!
The equipment is based on over 30 years of
professional experience and innovative
research in voice measurement.
Quality products and software for voice,
speech and singing research
1201EastFayetteStreet
Suite#15
Syracuse,NY13210
Checkusoutat
www.glottal.com
Our products can be found in leading research
centers and Universities worldwide and are
preferred by professionals in speech, voice,
language, and singing research.
4-2012
Glottal Enterprises Inc. does not promote the
use of its products for clinical medical applica-
tions. NVS Products and software provided
by Glottal Enterprises are not intended or ap-
proved for the diagnosis, cure, treatment, or
prevention of disease in humans or animals.
2. The NEM System measures and displays the na-
sal emission of airflow during those consonants
that require oral air pressure for normal pronuncia-
tion, such as p, b, or s while simultaneously moni-
toring the speech loudness By measuring the
amount of nasal airflow, the system display reflects
the degree of velopharyngeal closure during the
consonant. The NEM System uses two screens to
accomplish all the needed functions. A practice
screen provides a real-time nasal emission/audio
display. A compare-to–model screen allows the
user to record speech sounds or phrases, play
them back, hear them, graphically represent them
and, with both sight and sound, compare them to
model productions or previous subject efforts.
Nasal Emission System Nasalance System Nasalance System cont.
Phone: (315)422-1213
Fax: (315)422-1216
information@glottal.com
1201 E. Fayette St, Syracuse, NY 13210 USA
The partition plate in the partition-style handle can
be chosen as one of the three easily interchange-
able partitions that fits most closely to the maxil-
lary anatomy of the user. The interchangeable
partition plates can be easily removed for cleaning
or sterilization
Glottal Enterprises does not promote the use of
its Nasalance System for clinical medical applica-
tions:
1. Nasalance does not directly reflect the subjec-
tive level of nasal resonance. One reason is that
nasalance varies with the vowel. In addition,
nasalance also is strongly affected by nasal con-
sonant coarticulation, whereas nasal resonance
is not.
2. It is difficult to establish ‘norms’ for nasalance,
given the various factors that can affect the
readings, especially the coarticulatory effects
and variations in nasalance readings with the
vowel being spoken.
For these reasons, users are well-advised not to
look for a procedure that will use nasalance meas-
urements to separate a normal voice from one
with VPI. (For more detail, see Rethinking Na-
salance and Nasal Emission, M. Rothenberg,
2013, available on the www.Rothenberg.org web-
site)
This is a picture af a Nasal Emission Practice
Screen showing pronunciations of the prac-
tice bi-syllable “apa”, with three amounts of
nasal emission (red areas) during the
“p”consonants . The green areas are the
sound levels in the vowels “a”.
The NAS System measures and displays an
acoustically based measure, termed Nasalance,
that is related to the degree of vowel nasalization
and correlates strongly with the degree of velopha-
ryngeal closure during voiced vowels and vowel-
like consonants.. The NAS System was designed
to make it an easy-to-use tool for displaying na-
salance in both research and teaching applica-
tions.
As with the NEM system, the Nasalance System
uses two computer screens. One screen, labeled
Practice provides a real-time nasalance display for
biofeedback applications. On the second screen,
labeled Compare-to-Model, the software allows the
user to record sounds or phrases, play them back
to hear them, graphically represent them and, with
both sight and sound, compare them to previous
student efforts.
The NAS software can be used interchangeably
with either a handle that uses the proprietary Glot-
tal Enterprises dual-chamber circumferentially
vented (CV) mask, or a handle using a partition
plate held against the upper lip. Either style handle
allows the user to hold the mask comfortably in
position on the face with only one hand. With all
handle styles, all electronics required is contained
in a rectangular box mounted on the handle, and
connecting to a USB port on your computer.
The partition-style handle allows the user to obtain
nasalance readings without the inconvenience of a
mask, while the mask-style handle provides an
increased consistency in the nasalance readings
for critical research applications.
