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音程調整機構に見るゆらぎの特性

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  • The Fluctuation in the Adjustment of Verbal Interval

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Abstract

複雑さを語る方法論として、時間の経過と共に顕現しうる予測、制御からのずれを指摘する方法が考えられる。発声における音程は、自声のフィードバックによってより安定し、それと同時にゆらぎがより大きくなる。自声のフィードバック制御のある条件(条件0)とフィードバック制御が妨害された条件(条件1での歌唱データに対して、それぞれ母音窓を切り出し、おのおのの母音窓について、基本周波数周辺でのピークの安定とゆらぎの大きさについて解析した。同じ母音の発声において、母音窓の大きさと条件0が条件1より安定する割合に線形な正の相関が見られた。また、同じ母音の発声において、母音窓の大きさと条件0の方が条件1よりゆらぎが大きくなる割合に関しても、線形な正の相関が見られた。このことは、自声のフィードバック制御のある条件で、ゆらぎの増大が基本周波数周辺のピークの安定、つまり発声における音程の安定に関与していることを示している。自声のフィードバック制御下の発声は、健常者の通常の発話行為そのものであるが、これにおいてさえ、時間の経過と共に予測、制御からのずれが顕現しうることが示される。

The emergent difference from prediction and control with the passage of time can be pointed out, as a way to discuss complexity. The vocal interval was more stable and the fluctuation of the interval was larger in the condition with feedback control of one's own voice (Condition 0) than in the condition with obstructed feedback (Condition 1). Vowel windows were extracted from data samples of songs in the condition with feedback control of one's own voice and in the condition with obstructed feedback control. The data was analyzed to determine the stability of the peak and the amount of fluctuation of the fundamental frequency in each vowel windows of songs. A linear correlation was found between the length of vowel windows and the rate in which the vocal interval in Condition 0 is more stable than that in Condition 1 with the same vowels in the same songs. Furthermore, a linear correlation was found between the length of vowel windows and the rate in which the amount of fluctuation in Condition 0 is larger than that in Condition 1 in the same vowels in the same songs. This indicates that the fluctuation relates to the stability of the peak around fundamental frequency or the stability of the verbal interval. The condition with feedback control of one's own voice represents ordinary vocalization of a health person's. Even in the ordinary condition, indications of a difference from perdition and control can emerge with the passage of time.

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