voice, also called Full Voice, in phonetics, the sound that is produced by the vibration of the vocal cords. All vowels are normally voiced, but consonants may be either voiced or voiceless (i.e., uttered without vibration of the vocal cords). The liquid consonant l and the nasal m, n, ng (as in “sing”) are normally voiced in English, the stops fricatives,affricate characteristically possess both voiced and voiceless forms.