Abstract
New methods for objective evaluation of nasality were introduced, including laser Doppler vibrometer, contact microphone system, and small microphone system. Subjects were two Japanese healthy males who speak Tokyo dialect. Tasks were sustained phonations of five Japanese vowels and /m/, repetitions of /ai/ and /mami/, and Japanese words of /shinksnsen/ and /shinbunshi/. Vibration of nasal skin was detected by laser Doppler vibrometer in terms of velocity (Nv), and by contact microphone in terms of deviation (Nc). Vibration of neck skin on larynx was detected by contact microphone (Lc). Sound radiating from nares was detected by small microphone (Nm). Sound radiating from nares and mouth was detected by standard microphone (NOm). The accelerometer system was used as standard, consisting of two pickups, one of which detected vibration of nasal skin (Na), and the other, neck skin on larynx (La). Nv/Lc, Nv/NOm, Nc/Lc, Nm/NOm were compared with Na/La. These values were normalized as the value for sustained /m/ as 1.0. Clinical use of these new methods was discussed.
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