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The voiceless alveolar non-sibilant fricative [θ̠] or [θ͇], using the alveolar diacritic from the Extended IPA, [1] is similar to the th in English thin. It occurs in Icelandic as well as an intervocalic and word-final allophone of English /t/ in dialects such as Hiberno-English and Scouse .
The voiced alveolar fricatives are consonantal sounds. The symbol in the International Phonetic Alphabet that represents these sounds depends on whether a sibilant or non-sibilant fricative is being described. The symbol for the alveolar sibilant is z , and the equivalent X-SAMPA symbol is z.
Features of the voiced alveolar fricative trill: Its manner of articulation is fricative trill, which means it is a non-sibilant fricative and a trill pronounced simultaneously. Its place of articulation is laminal alveolar, which means it is articulated with the blade of the tongue at the alveolar ridge.
The letters s, t, n, l are frequently called 'alveolar', and the language examples below are all alveolar sounds. (The Extended IPA diacritic was devised for speech pathology and is frequently used to mean "alveolarized", as in the labioalveolar sounds [p͇, b͇, m͇, f͇, v͇] , where the lower lip contacts the alveolar ridge.)
If the alveolar flap is the only rhotic consonant in the language, it may be transcribed with r although that symbol technically represents the trill. The voiced alveolar tapped fricative reported from some languages is actually a very brief voiced alveolar non-sibilant fricative .
The voiced alveolar sibilant affricate [d͡z] is the most common type, similar to the ds in English lads. The voiced alveolar non-sibilant affricate [dð̠], or [dð͇] using the alveolar diacritic from the Extended IPA, is found, for example, in some dialects of English and Italian. The voiced alveolar retracted sibilant affricate [d͡z̺]
alveolo-palatal sibilant fricatives [ɕ, ʑ]. Features of the voiced alveolo-palatal fricative: Its manner of articulation is sibilant fricative, which means it is generally produced by channeling air flow along a groove in the back of the tongue up to the place of articulation, at which point it is focused against the sharp edge of the nearly clenched teeth, causing high-frequency turbulence.
The voiced alveolar lateral fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents voiced dental , alveolar , and postalveolar lateral fricatives is ɮ (sometimes referred to as lezh ), and the equivalent X-SAMPA symbol is K\ .