Vietnamese phonology
This article is a technical description of the sound system of the Vietnamese language, including phonetics and phonology. Two main varieties of Vietnamese, Hanoi and Ho Chi Minh City, are described below.
Initial consonants
Initial consonants which exist only in the Hanoi dialect are in red, while those that exist only in the Saigon dialect are in blue.
/p/ occurs syllable-initially only in loan words, and is mostly converted into /ɓ/ (as in sâm banh, derived from French champagne).
/m, ɓ/ are bilabial, while /f, v/ are labiodental.
The glottalized stops are preglottalized and voiced: [ʔɓ, ʔɗ] (i.e., the glottis is always closed before the oral closure). This glottal closure is often not released before the release of the oral closure, resulting in the characteristic implosive pronunciation. However, sometimes the glottal closure is released prior to the oral release in which case the stops are pronounced [ʔb, ʔd]. Therefore, the primary characteristic is preglottalization with implosion being secondary.