Register (phonology)

In phonology, a register, or pitch register, is a prosodic feature of syllables in certain languages in which tone, vowel phonation, glottalization or similar features depend upon one another.

It occurs in Burmese, Vietnamese, Wu Chinese and Zulu.

Burmese
In Burmese, differences in tone correlate with vowel phonation and so neither exists independently. There are three registers in Burmese, which have traditionally been considered three of the four "tones". (The fourth is not actually a register but is a closed syllable, and is similar to the so-called "entering tone" in Middle Chinese phonetics.) Jones (1986) views the differences as "resulting from the intersection of both pitch registers and voice registers.... Clearly Burmese is not tonal in the same sense as such other languages and therefore requires a different concept, namely that of pitch register."

Vietnamese
In Vietnamese, which has six tones, two tones are largely distinguished by phonation instead of pitch. Specifically, the ngã and sắc tones are both high rising but ngã is distinguished by the presence of a glottal stop in the middle of the vowel. The nặng and huyền tones are both pronounced as low falling, but distinguished primarily by nặng being short and pronounced with creaky voice, and huyền being noticeably longer and pronounced with breathy voice.

Khmer
Khmer is sometimes considered to be a register language. It has also been called a "restructured register language" because both its pitch and phonation can be considered allophonic. If they are ignored, the phonemic distinctions that they carry remain as differences in diphthongs and vowel length.

Latvian
An example of a non-Asian language with register distinctions is Latvian, at least in the central dialects. Long vowels in stressed syllables are often said to take one of three pitch accents that are conventionally called "rising", falling", and "broken". However, the "broken tone" is distinguished not by pitch but by glottalization, and is similar to the ngã register of Northern Vietnamese.