Pitch reset

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Suprasegmentals
Syllable
Mora
Tone
Tone contour
Pitch accent
Register
Downstep
Upstep
Downdrift
Tone terracing
Floating tone
Tone sandhi
Tone letter
Stress
Secondary stress
Vowel reduction
Length
Chroneme
Gemination
Vowel length
Extra-short
Prosody
Intonation (pitch)
Pitch contour
Pitch reset
Stress
Rhythm
Metrical foot
Loudness
Prosodic unit
Timing (rhythm)
Vowel reduction

In speech, phonetic pitch reset occurs at the boundaries between prosodic units.

Over the course of such units, the median pitch of the voice declines from its initial value, sometimes reaching the lower end of the speaker's vocal range. At this point it must reset to a higher level if the person is to continue speaking. In non-tonal languages, this sudden increase in pitch is one of the principle auditory cues to the start of a new prosodic unit.

In register tone languages which experience discrete downdrift, pitch reset is required as the tones approach the lower end of the speaker's comfort range, and in those languages which experience tone terracing, it is in addition required in order to maintain the tonal distinctions of the language.