高圧X線映画による語音発声時の声帯運動に関する研究

Abstract

The movements of the vocal cords during phonation were observed by high voltage radiograph motion pictures taken by an image amplifier. The films were studied in following ways : (1) viewing by large screen projection at slow film speed ; (2) observation on a film editing projector ; and (3) frame by frame analysis with detailed measurements. Ten boy students with intact larynx were examined. The results obtained are as follows : (1) In Japanese five vowels, [i] requires the longenst time to close the glottis completely and to commence phonation after complete closure of the glottis, [a] requires the schortest time and [o] [e] [u] are between those two. (2) In any vowel the time required for closure of the glottis and the time from completion of glottis closure to the biginning of voice production are longer in head voice than in chest voice. (3) The time from the biginning of glottis closing to the phonation is longer in voiced consonants than in voiceless consonants, and longer in explosives than in fricatives. (4) As regards attack of tone, hard attack or "coup de glotte" requires the longest time from the beginning of glottis closing to the voice production. (5) The vocal cords reach rest position about 0.0181-0.0937 sec. after the finishment of phonation. (6) The position of the vocal cords and the Morgagni's sinus during vowel utterance is usually highest in [i] and lowest in [o]. (7) The vocal cords become thicker and the contact area of the both cords is wider in chest voice than in head voice.