等韵是古代的一种反切方法，其主要变现是一种反切图，一般叫做“韵图”。在宋元两代，反切图是专为《切韵》《形式广韵》和《集韵》的反切而作的
The consonant rhythm matched nasal rhythm in early rhyme map of qieyue system. Along with the changing time, consonant rhythm was arranged with both vocalic and nasal rhythm gradually by the writers of rhythm maps to show popular sound.
早期切韵系统的等韵图是以入声韵承阳声韵的,随着时代的变化和语音的演变,韵图的撰写者为了体现时音,在韵图的编排上逐渐把入声韵兼配阴阳声韵,后来发展到全部只与阴声韵相配。
参考来源 - 韵图中入声韵与阴阳声韵相配研究·2,447,543篇论文数据，部分数据来源于NoteExpress
《等韵图经》记录的不是单纯的北京口语音，还有文读音。
Deng Yun Tu Jing recorded not only the sounds of Beijing colloquial pronunciation but also the literary pronunciation.
因而利用了韵图来论证《五方元音》所反映时代的特色语音特征。
This paper also uses the Wu-fang Yuan-yin'rhyme table to proof the phonetic character that Wu-fang Yuan-yin reflects.
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