This template renders a pitch contour in the numerical tone notation of Yuen Ren Chao as an IPA tone letter.
The template takes one positional parameter: ((Chinese tone letter|contour))
, where the pitch contour is specified as a string of up to three numbers in the range 1 to 5 (lowest to highest).
This is the convention for Chinese and other Asian languages; pitch numbers follow different conventions for African and meso-American languages.
For example, the four tones of Standard Chinese may be rendered as:
((Chinese tone letter|55))
→ ˥((Chinese tone letter|35))
→ ˧˥((Chinese tone letter|214))
→ ˨˩˦((Chinese tone letter|51))
→ ˥˩