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In phonetics and phonology, a sonorant is a speech sound that is produced without turbulent airflow in the vocal tract: fricatives and plosives (for example, /z/ and /d/, respectively) are not sonorants. Vowels are sonorants, as are consonants like /m/ and /l/. Other consonants, like /d/ or /s/, restrict the airflow enough to cause turbulence, and so are non-sonorant. In addition to vowels, phonetic categorizations of sounds that are considered sonorant include approximants and nasal consonants. In the sonority hierarchy, all sounds higher than fricatives are sonorants. They can therefore form the nucleus of a syllable in languages that place that distinction at that level of sonority; see Syllable for details.
Sonorants are those articulations in which there is only a partial closure or an unimpeded oral or nasal scape of air; such articulations, typically voiced, and frequently frictionless, without noise component, may share many phonetic characteristics with vowels.
The word resonant is sometimes used for these non-turbulent sounds. In this case, the word sonorant may be restricted to non-vocoid resonants; that is, all of the above except vowels and semivowels. However, this usage is becoming dated.
Sonorants contrast with obstruents, which do cause turbulence in the vocal tract. Among consonants pronounced far back in the throat (uvulars, pharyngeals) the distinction between an approximant and a voiced fricative is so blurred that such sounds as voiced uvular fricative ([ʁ]) and voiced pharyngeal fricative ([ʕ]) often behave like sonorants. The pharyngeal consonant is also a semivowel corresponding to the vowel [ɑ].
Whereas most obstruents are voiceless, the great majority of sonorants are voiced. It is certainly possible to make voiceless sonorants, but sonorants that are unvoiced occur as phonemic in only about 5 percent of the world's languages[1]. These are almost exclusively found in the area around the Pacific Ocean from New Caledonia clockwise to South America and belong to a number of language families, among them Austronesian, Sino-Tibetan, Na-Dene and Eskimo-Aleut. It is notable that, in every case where a voiceless sonorant does occur, there is a contrasting voiced sonorant.[verification needed]
Voiceless sonorants tend to be extremely quiet and very difficult to recognise even for those people whose language does contain them. They have a strong tendency to either revoice or undergo fortition to form for example a fricative like ç or ɬ.
Examples of sonorants
A typical sonorant inventory found in many languages comprises the following: two nasals /m/, /n/, two semivowels /w/, /j/, and two liquids /l/, /r/.
English has the following sonorant consonantal phonemes: /l/, /m/, /n/, /ŋ/, /ɹ/, /w/, /j/[2].
An obstruent is a consonant sound formed by obstructing airflow, causing increased air pressure in the vocal tract. In phonetics, articulation may be divided into two large classes: obstruents and sonorants.
Obstruents are those articulations in which there is either a total closure of the vocal tract, or a partial closure, i.e. a stricture causing friction, both groups being associated with a noise component.
Obstruents are subdivided into stops (with total closure followed by an "explosive" release of air – hence the equivalent term plosive), affricates (with at first a stop-like total closure, followed by a more controlled, fricative-style release, i.e. a stricture causing friction), and fricatives (with only limited closure, i.e. no more than a steady stricture causing friction). Obstruents are prototypically voiceless, though voiced obstruents are common. This contrasts with sonorants, which are much more rarely voiceless
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Obstruent
http://en.wikipedia.org/wiki/Obstruent
Sonorant
http://en.wikipedia.org/wiki/Sonorant
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