Abstract
Human respiration is one of aito-kineses, and can be used for human interfaces. It has been used for wind instruments and breath pressure switches available commercially. These devices restrict mouth movements, and hygienic issues have been remained. In this study, a small force sensor, load cell, placed in front of mouth, has been employed to measure expiratory flow pressure for a non-contact input interface. Fundamental properties of the device were studied to discriminate expiratory flow from ambient air flows and the relationship between expiratory flow and input pressure were quantitatively measured. Expiratory flow pressures characterized with specific pronunciations and a feasibility for phonetic training was investigated.
