Comparing tones between Taiji Romanisation and other systems

The chart on this page provides a comparison between the tones appearing in the POJ system against that of Taiji Romanisation. The tone numbering in POJ is the same as that of Tailo. Both POJ and Tailo recognize seven distinct tone numbers, these are simplified to only four in Taiji. POJ and Tailo mark the tones with diacritics while Taiji mark with digits. The existing tones in POJ and Tailo are numbered 1, 2, 3, 4, 5, 7 and 8 while those in Taiji are numbered 1, 2, 3 and 4.

The benefit of the POJ and Tailo tone numbering system is that one can determine the group of words that do not sandhi. These are the words with the "light departing" tone, numbered as tone 7. They correspond to the "regular words" in Taiji which are words that retain the Taiji tone 3 regardless their location in a disyllabic word.

The benefit of the Taiji tone numbering system is that it can be keyed from a standard keyboard. The reduction to only four tones also lead to a simplified rule for tone sandhi.