New separator-style handle for Nasalance measurement

Partition-based handle	Use of partition-based handle	Use of mask-based handle

For Speech Tutor users who are interested in tracking only vowel Nasalance, and not Nasal Emission in consonants, Glottal Enterprises can now supply a separator-style measurement handle that is interchangeable with the dual-chamber oronasal mask.  For researchers interested in making comparisons, this comfortable, hand-held separator offers a measurement solution comparable to that of some competing systems for measuring Nasalance.  A main-screen selector on the latest version of Speech Tutor enables the user to change instantly beween a mask and a partition.  Owners of older versions of Speech Tutor can upgrade their software free of charge when purchasing a partition-style handle.  Contact us if you would like more information about this option.

November-06


The new Aeroview program from Glottal Enterprises uses pressure and airflow signals from a Glottal Enterprises CV mask and matching pressure transducers to calculate the ‘average glottal flow resistance’ during vowel production, Rg, and its reciprocal, the ‘average glottal flow conductance’, Gg.   To estimate subglottal pressure the program uses the technique of extrapolating subglottal pressure from intraoral pressure, using an automated factory-optimized algorithm.  The Sound Pressure Level (SPL) of the measured vowel segment is also measured and displayed, as well as the airflow and estimated subglottal pressure from which Rg and Gg are computed. The Aeroview program can also be readily adapted to measuring the Phonation Threshold Pressure (PTP).  Use of the proprietory Glottal Enterprises CV mask results in much less acoustic distortion and more meaningful SPL readings than do competing systems based on respiratory mask technology.

Advantages over Kay-Pentax PAS system The subglottal pressure extrapolation technique used in Aeroview was developed in 1993 by Glottal Enterprises founder Martin Rothenberg. Little speech distortion means:  Recorded speech can be heard clearly when replayed.  The airflow pulse pattern during the vocalization can be seen on the display (not just the average airflow).  Inverse filtering can even be used with Waveview.  Irregular vocal fold vibration and breathy voice (incomplete vocal fold closure) can be identified.  More meaningful SPL measurements can be attained. Can use USB input on any computer, even a laptop.  Requires no hardware installation in the computer. Easily moved between computers. The dual-chamber mask in the Aeroview system can be used to stop nasal airflow leakage in soft voice when measuring Phonation Threshold Pressure, a common source of PTP error. Ergonomic one-hand operation. The interactive AeroviewStudent instructional CD available from Glottal Enterprises provides a thorough introduction to the operation of Aeroview and the interpretation of the results.