Mizo is a tonal language, in which differences in pitch and pitch contour can change the meanings of words.
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Unlike many Native American, African, and Chinese languages, Vietnamese tones do not rely solely on pitch contour.
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In tonal languages, in most cases the tone of a syllable is carried by the vowel, meaning that the relative pitch or the pitch contour that marks the tone is superimposed on the vowel.
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In tonal languages, each syllable has an inherent pitch contour, and thus minimal pairs exist between syllables with the same segmental features but different tones.
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In most languages, the pitch or pitch contour in which a syllable is pronounced conveys shades of meaning such as emphasis or surprise, or distinguishes a statement from a question.
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There are also languages that combine relative-pitch and contour tones, such as many Kru languages, where nouns are distinguished by contour tones and verbs by pitch.
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Others have a contour system that also distinguishes tones with gliding pitch.
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The definition of such instruments is virtually limitless, as one can combine any given models available with any amount of sources of modulation in terms of pitch, frequency and contour.
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A tone in a contour-tone language which remains at approximately an even pitch is called a level tone.