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downdrift
In phonetics, downdrift (also known as 'automatic downstep') is the cumulative lowering of pitch in the course of a sentence due to interactions among tones in a tonal language. The usual cause of downdrift is when the tones in three successive syllables are H L H. In this case the second high tone tends to be lower than the first. The effect can accumulate so that with each low tone, the pitch of the high tones becomes slightly lower, until the end of the intonational phrase, when the pitch is 'reset'.〔Connell (2001).〕
Two basic types of downdrift are found. In one, called ''discrete downdrift'', in which when downstep occurs all tones shift downward, so that their relative difference in pitch remains constant; in the other, called ''tone terracing,'' the pitch of the low tone remains at the lower end of the speaker's vocal range, while the other tones shift downward, so that their difference in pitch narrows.
Pitch reset is required in the first instance because the tones approach the lower end of the speaker's comfort range, and in the second because the tonal distinctions of the language start being lost.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「downdrift」の詳細全文を読む
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