声のpitchとintensityと発声持続時間について

The Relationship between Pitch and Intensity and Maximum Phonation Time

I．はじめに

　発声の能力に関する検査法として，発声持続時間があるが，これは一種の負荷試験であり，最も長く発声するという努力をさせることが一つの条件となる。この場合，発声させる声のpitch，強さ，呼気流率等が当然関係し，発声時における呼気調節あるいは，喉頭調節の仕方により，また発声する声の母音の相違等によっても変化し得る。

　しかし一般には従来よりこの方法を日常臨床で行う場合には母音／ア／により，声の高さは自然な話声位で，また声の強さは，自然の中等度でとされ，特に細かく定められた方法では行われていない。

　A maximum phonation time is influenced by the pitch and intensity of speaking voice. The author studied the change of air flow rate and maximum phonation time under instructed pitch and intensity.

　After measurement of speech fundamental frequency, air flow rate, at the pitch of speech fundamantal frequency three, five and eight degrees higher than speech fundamental frequency at 65, 75, and 85 dB was studied.

　The subjects comprised 12 (6 male and 6 female), 6 of these had been exercised a vocal training.

　The result disclosed that the pitch at three and five degrees higher than the speech fundamental frequency and the intensity at 75 dB were the most constant. But the subject who had not received vocal training showed no definite result.