Voiceless dental fricative

Voiceless dental non-sibilant fricative

Voiceless dental non-sibilant fricative
θ
IPA number	130
Encoding
Entity (decimal)	θ
Unicode (hex)	U+03B8
X-SAMPA	T
Kirshenbaum	T
Braille
Image
Sound
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The voiceless dental non-sibilant fricative is a type of consonantal sound used in some oral languages. It is familiar to English speakers as the 'th' in thing. Though rather rare as a phoneme in the world's inventory of languages, it is encountered in some of the most widespread and influential (see below). The symbol in the International Phonetic Alphabet that represents this sound is ⟨θ⟩, and the equivalent X-SAMPA symbol is T. The IPA symbol is the Greek letter theta, which is used for this sound in Greek, and the sound is thus often referred to as "theta".

The dental non-sibilant fricatives are often called "interdental" because they are often produced with the tongue between the upper and lower teeth, and not just against the back of the upper or lower teeth, as they are with other dental consonants.

Among the more than 60 languages with over 10 million speakers, only English, Standard Arabic, European standard Spanish, Burmese, and Greek have the voiceless dental non-sibilant fricative. Speakers of languages and dialects without the sound sometimes have difficulty producing or distinguishing it from similar sounds, especially if they have had no chance to acquire it in childhood, and typically replace it with a voiceless alveolar fricative (/s/), voiceless dental stop (/t/), or a voiceless labiodental fricative (/f/; known respectively as th-alveolarization, th-stopping,^[1] and th-fronting^[2]).

Among Turkic languages, Bashkir and Turkmen have voiceless dental non-sibilant fricative.

The sound is known to have disappeared from a number of languages, e.g. from most of the Germanic languages or dialects, where it is retained only in English and Icelandic.

Features

Features of the voiceless dental non-sibilant fricative:

• Its manner of articulation is fricative, which means it is produced by constricting air flow through a narrow channel at the place of articulation, causing turbulence. It does not have the grooved tongue and directed airflow, or the high frequencies, of a sibilant.

• Its place of articulation is dental, which means it is articulated with the tongue at either the upper or lower teeth, or both. (Most stops and liquids described as dental are actually denti-alveolar.)

• Its phonation is voiceless, which means it is produced without vibrations of the vocal cords. In some languages the vocal cords are actively separated, so it is always voiceless; in others the cords are lax, so that it may take on the voicing of adjacent sounds.

• It is an oral consonant, which means air is allowed to escape through the mouth only.

• It is a central consonant, which means it is produced by directing the airstream along the center of the tongue, rather than to the sides.

• The airstream mechanism is pulmonic, which means it is articulated by pushing air solely with the lungs and diaphragm, as in most sounds.

Occurrence

Voiceless corono-dentoalveolar sibilant

The voiceless corono-dentoalveolar sibilant is the only sibilant fricative in some dialects of Andalusian Spanish. It doesn't have an official symbol in the International Phonetic Alphabet, and is usually represented by an ad-hoc symbol such as ⟨s̄⟩ or ⟨θ^ṣ⟩.

Dalbor (1980) describes this sound as follows: "[s̄] is a voiceless, corono-dentoalveolar groove fricative, the so-called s coronal or s plana because of the relatively flat shape of the tongue body.... To this writer, the coronal [s̄], heard throughout Andalusia, should be characterized by such terms as "soft," "fuzzy," or "imprecise," which, as we shall see, brings it quite close to one variety of /θ/ … Canfield has referred, quite correctly, in our opinion, to this [s̄] as "the lisping coronal-dental," and Amado Alonso remarks how close it is to the post-dental [θ̦], suggesting a combined symbol [θ^ṣ] to represent it."

Features

Features of the voiceless corono-dentoalveolar sibilant:

• 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.
• Its place of articulation is denti-alveolar, which means it is articulated with a flat tongue against the alveolar ridge and upper teeth.
• It is normally apical, which means it is pronounced with the very tip of the tongue.

• Its phonation is voiceless, which means it is produced without vibrations of the vocal cords. In some languages the vocal cords are actively separated, so it is always voiceless; in others the cords are lax, so that it may take on the voicing of adjacent sounds.

• It is an oral consonant, which means air is allowed to escape through the mouth only.

• Its manner of articulation is fricative, which means it is produced by constricting air flow through a narrow channel at the place of articulation, causing turbulence.

• The airstream mechanism is pulmonic, which means it is articulated by pushing air solely with the lungs and diaphragm, as in most sounds.

Occurrence

See also

• Voiceless alveolar non-sibilant fricative
• Voiced dental sibilant
• Voiceless alveolar retracted sibilant
• Sibilant consonant#Possible combinations
• Pronunciation of English th
• Index of phonetics topics

References

Bibliography

External links

• Discrimination of Unvoiced Fricatives using Machine Learning Methods

v t e   International Phonetic Alphabet   IPA topics IPA International Phonetic Association History of the IPA Extensions to the IPA Kiel convention (1989) Journal of the IPA (JIPA) Naming conventions Phonetics Diacritics Segments Tone letter Place of articulation Manner of articulation Special topics Case variants of IPA letters Handwritten IPA Obsolete and nonstandard symbols IPA chart for English dialects Encodings SAMPA X-SAMPA Kirshenbaum TIPA Phonetic symbols in Unicode WorldBet IPA Braille   Consonants v t e IPA pulmonic consonantschart image • audio Place → Labial Coronal Dorsal Radical Glottal ↓ Manner Bila­bial Labio-​dental Den​tal Alve​olar Post­alveolar Retro​flex Alveolo-​palatal Pal​a​tal Ve​lar Uvu​lar Pha​ryn​geal Epi​glot​tal Glot​tal Nasal m̥ m ɱ n̪ n̥ n n̠ ɳ̊ ɳ ɲ̟ ɲ̊ ɲ ŋ̊ ŋ ɴ Stop p b p̪ b̪ t̪ d̪ t d ʈ ɖ c ɟ k ɡ q ɢ ʡ ʔ Sibilant fricative s̪ z̪ s z ʃ ʒ ʂ ʐ ɕ ʑ Non-sibilant fricative ɸ β f v θ ð θ̱ ð̠ ç ʝ x ɣ χ ʁ ħ ʕ ʜ ʢ h ɦ Approximant ʋ ɹ ɻ j̊ j ɰ Flap or tap ⱱ̟ ⱱ ɾ ɽ ɢ̆ ʡ̯ Trill ʙ r̥ r ɽ͡r ʀ ᴙ * Lateral fricative ɬ ɮ ꞎ * ʎ̝̊ ʟ̝̊ ʟ̝ Lateral approximant l̥ l ɭ ʎ̟ ʎ ʟ Lateral flap ɺ ɺ̢ * ʎ̯ ʟ̆ Non-pulmonic consonants Clicks ʘ ǀ ǃ ǂ ǁ ʘ̃ ʘ̃ˀ ʘ͡q ʘ͡qʼ ‼ Implosives ɓ̥ ɓ ɗ̥ ɗ ᶑ ʄ̊ ʄ ɠ ʛ Ejectives pʼ t̪ʼ tʼ ʈʼ cʼ kʼ qʼ fʼ θʼ sʼ ɬʼ ʃʼ ʂʼ ɕʼ xʼ χʼ tsʼ tɬʼ cʎ̝̥ʼ tʃʼ ʈʂʼ kxʼ kʟ̝̊ʼ qχʼ Affricates p̪f b̪v ts dz t̪s̪ d̪z̪ tθ dð tʃ dʒ tɕ dʑ ʈʂ ɖʐ tɬ dɮ cç ɟʝ cʎ̥˔ kx ɡɣ kʟ̝̊ ɡʟ̝ qχ ɢʁ Co-articulated consonants Continuants ʍ w ɥ ɧ Occlusives k͡p ɡ͡b ŋ͡m — These tables contain phonetic symbols, which may not display correctly in some browsers. [Help] — Where symbols appear in pairs, left–right represent the voiceless–voiced consonants. — Shaded areas denote pulmonic articulations judged to be impossible. — Symbols marked with an asterisk (*) are not defined in the IPA. Chart image Pulmonics Non-pulmonics Affricates Co-articulated   Vowels Front Near-​front Central Near-​back Back Close •iy •ɨʉ •ɯu •ɪʏ •ɪ̈ʊ̈ •ɯ̽ʊ •eø •ɘɵ •ɤo •e̞ø̞ ə •ɤ̞o̞ •ɛœ •ɜɞ •ʌɔ æ ɐ •aɶ ä •ɑɒ Near-close Close-mid Mid Open-mid Near-open Open IPA help • chart •  chart with audio • view