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 http://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.
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