Nasometry
Nasometry is a measurement method of nasality and is often used as a synonym for the separate sound pressure measurement. The measurement of the nasal and oral sound takes place separately from one another in order to be able to better assess the portion of the signal from the mouth or nasal cavity. This method is important in the therapy of the ear, nose and throat customer, whereby the progress of the therapy can be documented especially for patients with pathological nasality (for example with cleft lip and palate). But phonetics also uses this measurement method to make the description of sounds even more precise.
Measuring device
For the measurement, the patient wears a headset, which consists of a plate that separates the oral and nasal sound from each other. Microphones that record the signals are attached above and below this separator plate. The sound is processed in the nasometer or a connected computer. The values are output as nasalance .
Nasometer
After the first efforts in relation to the separate sound pressure measurement were not pursued at the University of Halle, efforts were made in the Anglo-Saxon region to produce a device for the objective measurement of nasality since the 1970s. For a few years now, Kay Elemetrics has been selling the latest version of the device, Nasometer II, Mod. 6400. In order to be able to display the results optimally, a filtering takes place before the values are output on a monitor.
NasalView
Awan designed the NasalView (Tiger Electronics) in 1995 because the nasometer is very expensive to purchase and therefore rather unsuitable for therapists outside of large clinics. The functionality hardly differs from that of the nasometer. However, the data is evaluated in a connected computer, with no filtering taking place beforehand.
literature
- Ramona Benkenstein: Comparison of objective methods for investigating nasality in German , Frankfurt / Main 2007 ( Hallesche Schriften zur Sprachwissenschaft und Phonetik. 19 ). ISBN 3-631-56176-8
- Kristin Müller: Comparative study on the diagnostic value of nasometry for patients with cleft lip and palate and healthy people , dissertation from the University of Jena, Jena 2004.
- Tim Bressmann, R. Sader, SN Awan, R. Busch, SJ Brockmeier, H.-F. Lineshofer, H.-H. Horch: Nasalance measurement with the Nasal View during therapy control of patients with cleft lip and palate In: Language – Voice – Hearing 2 (22) , 1998, 98-106.
