Rime / rhyme tables / charts
In Chinese they are called yùntú 韻圖 / 韵图. These tools are vitally important in the development of Sinitic phonology, but barely known outside of sinological specialists, so — for the history of world phonology — it is worthwhile to introduce them to linguists in general.
A rime table or rhyme table (simplified Chinese: 韵图; traditional Chinese: 韻圖; pinyin: yùntú; Wade–Giles: yün-t'u) is a Chinese phonological model, tabulating the syllables of the series of rime dictionaries beginning with the Qieyun (601) by their onsets, rhyme groups, tones and other properties. The method gave a significantly more precise and systematic account of the sounds of those dictionaries than the previously used fǎnqiè analysis, but many of its details remain obscure. The phonological system that is implicit in the rime dictionaries and analysed in the rime tables is known as Middle Chinese, and is the traditional starting point for efforts to recover the sounds of early forms of Chinese. Some authors distinguish the two layers as Early and Late Middle Chinese respectively.
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