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A tone contour or contour tone is a tone in a tonal language which shifts from one pitch to another over the course of the syllable or word. Tone contours are especially common in East Asia, Southeast Asia, West Africa, Nilo-Saharan languages, Khoisan languages, Oto-Manguean languages and some languages of South America.
Many tone languages have contour tones, which move from one level to another. For example, Mandarin Chinese has four lexical tones. The high tone is level, without contour; the falling tone is a contour from high pitch to low; the rising tone a contour from mid pitch to high, and, when spoken in isolation, the low tone takes on a dipping ...
However, after a falling tone it takes on a low pitch; the contour tone remains on the first syllable, but the pitch of the second syllable matches where the contour leaves off. And after a low-dipping tone, the contour spreads to the second syllable: the contour remains the same (˨˩˦) whether the word has one syllable or two. In other words ...
The tone contours of Mandarin Chinese. In the convention for Chinese, 1 is low and 5 is high. The corresponding tone letters are ˥, ˧˥, ˨˩˦, ˥˩.. A series of iconic tone letters based on a musical staff was devised by Yuen Ren Chao in the 1920s [2] by adding a reference stave to the existing convention of the International Phonetic Alphabet.
These properties can be those of stress, intonation (a single pitch and rhythm contour), or tonal patterns. Prosodic units occur at a hierarchy of levels, from the syllable, the metrical foot and phonological word to the intonational unit (IU) and to a complete utterance. [1]
The tones have a contour in isolation, but for the following purposes, it can be ignored. However, low tone always occurs after voiced consonants and only then. Thus, the only tonal distinction is after voiceless consonants and in vowel-initial syllables, and there is only a two-way distinction between high tone and mid tone.
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Pitch contour may include multiple sounds utilizing many pitches, and can relate the frequency function at one point in time to the frequency function at a later point. It is fundamental to the linguistic concept of tone , where the pitch or change in pitch of a speech unit over time affects the semantic meaning of a sound.