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A fricative is a
consonant In articulatory phonetics, a consonant is a speech sound that is articulated with complete or partial closure of the vocal tract. Examples are and pronounced with the lips; and pronounced with the front of the tongue; and pronounced wi ...
produced by forcing air through a narrow channel made by placing two articulators close together. These may be the lower lip against the upper teeth, in the case of ; the back of the tongue against the
soft palate The soft palate (also known as the velum, palatal velum, or muscular palate) is, in mammals, the soft tissue constituting the back of the roof of the mouth. The soft palate is part of the palate of the mouth; the other part is the hard palate. ...
in the case of
German German(s) may refer to: * Germany (of or related to) ** Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law **Ge ...
(the final consonant of ''
Bach Johann Sebastian Bach (28 July 1750) was a German composer and musician of the late Baroque period. He is known for his orchestral music such as the ''Brandenburg Concertos''; instrumental compositions such as the Cello Suites; keyboard wor ...
''); or the side of the tongue against the molars, in the case of
Welsh Welsh may refer to: Related to Wales * Welsh, referring or related to Wales * Welsh language, a Brittonic Celtic language spoken in Wales * Welsh people People * Welsh (surname) * Sometimes used as a synonym for the ancient Britons (Celtic peop ...
(appearing twice in the name ''
Llanelli Llanelli (" St Elli's Parish"; ) is a market town and the largest community in Carmarthenshire and the preserved county of Dyfed, Wales. It is located on the Loughor estuary north-west of Swansea and south-east of the county town, Carmarth ...
''). This turbulent airflow is called frication. A particular subset of fricatives are the sibilants. When forming a sibilant, one still is forcing air through a narrow channel, but in addition, the tongue is curled lengthwise to direct the air over the edge of the teeth. English , , , and are examples of sibilants. The usage of two other terms is less standardized: "Spirant" is an older term for fricatives used by some American and European phoneticians and phonologists. "Strident" could mean just "sibilant", but some authors include also
labiodental In phonetics, labiodentals are consonants articulated with the lower lip and the upper teeth. Labiodental consonants in the IPA The labiodental consonants identified by the International Phonetic Alphabet are: The IPA chart shades out ''labio ...
and
uvular Uvulars are consonants articulated with the back of the tongue against or near the uvula, that is, further back in the mouth than velar consonants. Uvulars may be stops, fricatives, nasals, trills, or approximants, though the IPA does not prov ...
fricatives in the class.


Types

The airflow is not completely stopped in the production of fricative consonants. In other words, the airflow experiences
friction Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: *Dry friction is a force that opposes the relative lateral motion of ...
.


Sibilants

* voiceless coronal sibilant, as in English ''s''ip * voiced coronal sibilant, as in English ''z''ip **
voiceless dental sibilant The voiceless alveolar fricatives are a type of fricative consonant pronounced with the tip or blade of the tongue against the alveolar ridge (gum line) just behind the teeth. This refers to a class of sounds, not a single sound. There are at lea ...
**
voiced dental sibilant 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 ...
** voiceless apical sibilant ** voiced apical sibilant ** voiceless predorsal sibilant (
laminal A laminal consonant is a phone (speech sound) produced by obstructing the air passage with the blade of the tongue, the flat top front surface just behind the tip of the tongue in contact with upper lip, teeth, alveolar ridge, to possibly, as ...
, with tongue tip at lower teeth) ** voiced predorsal sibilant (laminal) **
voiceless postalveolar sibilant A voiceless postalveolar fricative is a type of consonantal sound used in some spoken languages. The International Phonetic Association uses the term ''voiceless postalveolar fricative'' only for the sound , but it also describes the voiceless ...
(laminal) ** voiced postalveolar sibilant (laminal) *
voiceless palato-alveolar sibilant A voiceless postalveolar fricative is a type of consonantal sound used in some spoken languages. The International Phonetic Association uses the term ''voiceless postalveolar fricative'' only for the sound , but it also describes the voiceless ...
( domed, partially palatalized), as in English ''sh''ip *
voiced palato-alveolar sibilant A voiced postalveolar fricative is a type of consonantal sound used in some spoken languages. The International Phonetic Association uses term ''voiced postalveolar fricative'' only for the sound , but it also describes the voiced postalveolar ...
(domed, partially palatalized), as the ''si'' in English vi''si''on *
voiceless alveolo-palatal sibilant The voiceless alveolo-palatal sibilant fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is ("c", plus the curl also found in its voiced counter ...
(laminal, palatalized) *
voiced alveolo-palatal sibilant The voiced alveolo-palatal sibilant fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is ("z", plus the curl also found in its voiceless counterp ...
(laminal, palatalized) *
voiceless retroflex sibilant The voiceless retroflex sibilant fricative is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is which is a Latin letter s combined with a retroflex hook. ...
(
apical Apical means "pertaining to an apex". It may refer to: *Apical ancestor, refers to the last common ancestor of an entire group, such as a species (biology) or a clan (anthropology) *Apical (anatomy), an anatomical term of location for features loc ...
or subapical) *
voiced retroflex sibilant The voiced retroflex sibilant fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is z`. Like all the retro ...
(apical or subapical) All
sibilants Sibilants are fricative consonants of higher amplitude and pitch, made by directing a stream of air with the tongue towards the teeth. Examples of sibilants are the consonants at the beginning of the English words ''sip'', ''zip'', ''ship'', and ...
are coronal, but may be dental, alveolar, postalveolar, or
palatal The palate () is the roof of the mouth in humans and other mammals. It separates the oral cavity from the nasal cavity. A similar structure is found in crocodilians, but in most other tetrapods, the oral and nasal cavities are not truly separ ...
(
retroflex A retroflex (Help:IPA/English, /ˈɹɛtʃɹoːflɛks/), apico-domal (Help:IPA/English, /əpɪkoːˈdɔmɪnəl/), or cacuminal () consonant is a coronal consonant where the tongue has a flat, concave, or even curled shape, and is articulated betw ...
) within that range. However, at the postalveolar place of articulation, the tongue may take several shapes: domed,
laminal A laminal consonant is a phone (speech sound) produced by obstructing the air passage with the blade of the tongue, the flat top front surface just behind the tip of the tongue in contact with upper lip, teeth, alveolar ridge, to possibly, as ...
, or
apical Apical means "pertaining to an apex". It may refer to: *Apical ancestor, refers to the last common ancestor of an entire group, such as a species (biology) or a clan (anthropology) *Apical (anatomy), an anatomical term of location for features loc ...
, and each of these is given a separate symbol and a separate name. Prototypical retroflexes are subapical and palatal, but they are usually written with the same symbol as the apical postalveolars. The alveolars and dentals may also be either apical or laminal, but this difference is indicated with diacritics rather than with separate symbols.


Central non-sibilant fricatives

*
voiceless bilabial fricative The voiceless bilabial fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is . Features Features of the voiceless bilabial fricative: Occ ...
*
voiced bilabial fricative The voiced bilabial fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is B. The official symbol is the ...
*
voiceless labiodental fricative The voiceless labiodental fricative is a type of consonantal sound used in a number of spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is . Some scholars also posit the voiceless labiodental approx ...
, as in English ''f''ine *
voiced labiodental fricative The voiced labiodental fricative is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is v. The sound is similar to vo ...
, as in English ''v''ine *
voiceless linguolabial fricative The voiceless linguolabial fricative is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet The International Phonetic Alphabet (IPA) is an alphabetic system of phonetic notation b ...
*
voiced linguolabial fricative The voiced linguolabial fricative is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet The International Phonetic Alphabet (IPA) is an alphabetic system of phonetic notation base ...
*
voiceless dental non-sibilant fricative The voiceless dental non-sibilant fricative is a type of consonantal sound used in some spoken languages. It is familiar to English speakers as the 'th' in ''think''. Though rather rare as a phoneme in the world's inventory of languages, it is en ...
, as in English ''th''ing * voiced dental non-sibilant fricative, as in English ''th''at *
voiceless alveolar non-sibilant fricative The voiceless alveolar fricatives are a type of fricative consonant pronounced with the tip or blade of the tongue against the alveolar ridge (gum line) just behind the teeth. This refers to a class of sounds, not a single sound. There are at lea ...
*
voiced alveolar non-sibilant fricative 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 ...
* voiceless trilled fricative * voiced trilled fricative *
voiceless palatal fricative The voiceless palatal fricative is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is C. It is the non-sibilant equi ...
*
voiced palatal fricative The voiced palatal fricative is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet (IPA) that represents this sound is (crossed-tail j), and the equivalent X-SAMPA symbol is j\. It is t ...
*
voiceless velar fricative The voiceless velar fricative is a type of consonantal sound used in some spoken languages. It was part of the consonant inventory of Old English and can still be found in some dialects of English, most notably in Scottish English, e.g. in ''loc ...
*
voiced velar fricative The voiced velar fricative is a type of consonantal sound that is used in various spoken languages. It is not found in Modern English but existed in Old English. The symbol in the International Phonetic Alphabet that represents this sound is , ...
*
voiceless palatal-velar fricative The ''sj''-sound ( sv, sj-ljudet ) is a voiceless fricative phoneme found in most dialects of the sound system of Swedish. It has a variety of realisations, whose precise phonetic characterisation is a matter of debate, but which usually featur ...
(articulation disputed) The IPA also has letters for epiglottal fricatives, *
voiceless epiglottal fricative The voiceless epiglottal or pharyngeal trill, or voiceless epiglottal fricative,John Esling (2010) "Phonetic Notation", in Hardcastle, Laver & Gibbon (eds) ''The Handbook of Phonetic Sciences'', 2nd ed., p 695. is a type of consonantal sound, use ...
*
voiced epiglottal fricative The voiced epiglottal or pharyngeal trill, or voiced epiglottal fricative,John Esling (2010) "Phonetic Notation", in Hardcastle, Laver & Gibbon (eds) ''The Handbook of Phonetic Sciences'', 2nd ed., p 695. is a type of consonantal sound, used in s ...
with allophonic trilling, but these might be better analyzed as pharyngeal trills. * voiceless velopharyngeal fricative (often occurs with a
cleft palate A cleft lip contains an opening in the upper lip that may extend into the nose. The opening may be on one side, both sides, or in the middle. A cleft palate occurs when the palate (the roof of the mouth) contains an opening into the nose. The ...
) * voiced velopharyngeal fricative


Lateral fricatives

*
voiceless dental lateral fricative The voiceless alveolar lateral fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents voiceless dental, alveolar, and postalveolar lateral fricatives is , a ...
* voiced dental lateral fricative *
voiceless alveolar lateral fricative The voiceless alveolar lateral fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents voiceless dental, alveolar, and postalveolar lateral fricatives is , ...
*
voiced alveolar lateral fricative 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 (sometimes ...
*
voiceless postalveolar lateral fricative In linguistics, voicelessness is the property of sounds being pronounced without the larynx vibrating. Phonologically, it is a type of phonation, which contrasts with other states of the larynx, but some object that the word phonation implies v ...
( Mehri) * voiced postalveolar lateral fricative * or extIPA
voiceless retroflex lateral fricative The voiceless retroflex lateral fricative is a type of consonantal sound, used in some spoken languages. The IPA has no symbol for this sound. However, the "belt" of the voiceless lateral fricative is combined with the tail of the retroflex con ...
* or extIPA
Voiced retroflex lateral fricative The voiced retroflex lateral fricative is a type of consonantal sound. The IPA has no symbol for this sound, though there is an extIPA letter for it, , added to Unicode in 2021. Features Features of the voiced retroflex lateral fricative: ...
(in Ao) * or or extIPA
voiceless palatal lateral fricative The voiceless palatal lateral fricative is a type of consonantal sound, used in a few spoken languages. This sound is somewhat rare; Dahalo has both a palatal lateral fricative and an affricate; Hadza has a series of affricates. In Bura, ...
* or extIPA
voiced palatal lateral fricative The voiced palatal lateral fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is L_r. It is not known to o ...
(allophonic in Jebero) * or extIPA
voiceless velar lateral fricative The voiceless velar lateral fricative is a rare speech sound. As one element of an affricate, it is found for example in Zulu and Xhosa (see velar lateral ejective affricate). However, a simple fricative has only been reported from a few lang ...
* or extIPA
voiced velar lateral fricative The voiced velar lateral fricative is a very rare speech sound that can be found in Archi, a Northeast Caucasian language of Dagestan, in which it is clearly a fricative, although further forward than velars in most languages, and might better ...
The lateral fricative occurs as the ''ll'' of
Welsh Welsh may refer to: Related to Wales * Welsh, referring or related to Wales * Welsh language, a Brittonic Celtic language spoken in Wales * Welsh people People * Welsh (surname) * Sometimes used as a synonym for the ancient Britons (Celtic peop ...
, as in '' Lloyd'', '' Llewelyn'', and ''
Machynlleth Machynlleth () is a market town, community and electoral ward in Powys, Wales and within the historic boundaries of Montgomeryshire. It is in the Dyfi Valley at the intersection of the A487 and the A489 roads. At the 2001 Census it had a pop ...
'' (, a town), as the unvoiced 'hl' and voiced 'dl' or 'dhl' in the several languages of Southern Africa (such as
Xhosa Xhosa may refer to: * Xhosa people, a nation, and ethnic group, who live in south-central and southeasterly region of South Africa * Xhosa language, one of the 11 official languages of South Africa, principally spoken by the Xhosa people See als ...
and Zulu), and in Mongolian. * or and
voiceless grooved lateral alveolar fricative A lateral is a consonant in which the airstream proceeds along one or both of the sides of the tongue, but it is blocked by the tongue from going through the middle of the mouth. An example of a lateral consonant is the English ''L'', as in ''Larr ...
(a laterally lisped or ) (Modern South Arabian) * or and
voiced grooved lateral alveolar fricative A lateral is a consonant in which the airstream proceeds along one or both of the sides of the tongue, but it is blocked by the tongue from going through the middle of the mouth. An example of a lateral consonant is the English ''L'', as in ''Larr ...
(a laterally lisped or ) (Modern South Arabian)


IPA letters used for both fricatives and approximants

*
voiceless uvular fricative The voiceless uvular fricative is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , the Greek chi. The sound is represented by (ex with underdot) in Am ...
*
voiced uvular fricative The voiced uvular fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , an inverted small uppercase letter , or in broad transcription if rhot ...
*
voiceless pharyngeal fricative The voiceless pharyngeal fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is an h-bar, , and the equivalent X-SAMPA symbol is X\. In the trans ...
*
voiced pharyngeal fricative The voiced pharyngeal approximant or fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is ?\. Epiglott ...
No language distinguishes voiced fricatives from
approximants Approximants are speech sounds that involve the articulators approaching each other but not narrowly enough nor with enough articulatory precision to create turbulent airflow. Therefore, approximants fall between fricatives, which do produce a ...
at these places, so the same symbol is used for both. For the pharyngeal, approximants are more numerous than fricatives. A fricative realization may be specified by adding the uptack to the letters, . Likewise, the downtack may be added to specify an approximant realization, . (The
bilabial approximant The voiced bilabial fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is B. The official symbol is the G ...
and
dental approximant The voiced dental fricative is a consonant sound used in some spoken languages. It is familiar to English-speakers as the ''th'' sound in ''father''. Its symbol in the International Phonetic Alphabet is eth, or and was taken from the Old Engl ...
do not have dedicated symbols either and are transcribed in a similar fashion: . However, the base letters are understood to specifically refer to the fricatives.)


Pseudo-fricatives

*
voiceless glottal transition The voiceless glottal fricative, sometimes called voiceless glottal transition, and sometimes called the aspirate, is a type of sound used in some Speech communication, spoken languages that patterns like a fricative or approximant consonant ''p ...
, as in English ''hat'' * breathy-voiced glottal transition In many languages, such as English, the glottal "fricatives" are unaccompanied phonation states of the glottis, without any accompanying manner, fricative or otherwise. However, in languages such as Arabic, they are true fricatives. In addition, is usually called a "
voiceless labial-velar fricative In linguistics, voicelessness is the property of sounds being pronounced without the larynx vibrating. Phonologically, it is a type of phonation, which contrasts with other states of the larynx, but some object that the word phonation implies ...
", but it is actually an approximant. True doubly articulated fricatives may not occur in any language; but see
voiceless palatal-velar fricative The ''sj''-sound ( sv, sj-ljudet ) is a voiceless fricative phoneme found in most dialects of the sound system of Swedish. It has a variety of realisations, whose precise phonetic characterisation is a matter of debate, but which usually featur ...
for a putative (and rather controversial) example.


Aspirated fricatives

Fricatives are very commonly voiced, though cross-linguistically voiced fricatives are not nearly as common as tenuis ("plain") fricatives. Other phonations are common in languages that have those phonations in their stop consonants. However, phonemically aspirated fricatives are rare. contrasts with a tense, unaspirated in
Korean Korean may refer to: People and culture * Koreans, ethnic group originating in the Korean Peninsula * Korean cuisine * Korean culture * Korean language **Korean alphabet, known as Hangul or Chosŏn'gŭl **Korean dialects and the Jeju language ** ...
; aspirated fricatives are also found in a few
Sino-Tibetan languages Sino-Tibetan, also cited as Trans-Himalayan in a few sources, is a family of more than 400 languages, second only to Indo-European in number of native speakers. The vast majority of these are the 1.3 billion native speakers of Chinese languages. ...
, in some
Oto-Manguean languages The Oto-Manguean or Otomanguean languages are a large family comprising several subfamilies of indigenous languages of the Americas. All of the Oto-Manguean languages that are now spoken are indigenous to Mexico, but the Manguean branch of the ...
, in the Siouan language Ofo ( and ), and in the (central?)
Chumash languages Chumashan was a family of languages that were spoken on the southern California coast by Native American Chumash people, from the Coastal plains and valleys of San Luis Obispo to Malibu, neighboring inland and Transverse Ranges valleys and ca ...
( and ). The record may be Cone Tibetan, which has four contrastive aspirated fricatives: , , and .


Nasalized fricatives

Phonemically
nasalized In phonetics, nasalization (or nasalisation) is the production of a sound while the velum is lowered, so that some air escapes through the nose during the production of the sound by the mouth. An archetypal nasal sound is . In the Internationa ...
fricatives are rare.
Umbundu Umbundu, or South Mbundu (autonym umb, úmbúndú), one of many Bantu languages, is the most widely-spoken autochthonous language of Angola. Its speakers are known as ''Ovimbundu'' and are an ethnic group constituting a third of Angola's popula ...
has and Kwangali and Souletin Basque have . In
Coatzospan Mixtec Coatzospan Mixtec (Coatzóspam Mixtec) is a Mixtec language of Oaxaca spoken in the town of San Juan Coatzospan. Phonology Consonants in parentheses are marginal. In women's speech, is realized as before front vowels. Vowel qualities ar ...
, appear allophonically before a nasal vowel, and in Igbo nasality is a feature of the syllable; when occur in nasal syllables they are themselves nasalized. ----


Occurrence

Until its extinction, Ubykh may have been the language with the most fricatives (29 not including ), some of which did not have dedicated symbols or diacritics in the
IPA IPA commonly refers to: * India pale ale, a style of beer * International Phonetic Alphabet, a system of phonetic notation * Isopropyl alcohol, a chemical compound IPA may also refer to: Organizations International * Insolvency Practitioners ...
. This number actually outstrips the number of all consonants in English (which has 24 consonants). By contrast, approximately 8.7% of the world's languages have no phonemic fricatives at all. This is a typical feature of
Australian Aboriginal languages The Indigenous languages of Australia number in the hundreds, the precise number being quite uncertain, although there is a range of estimates from a minimum of around 250 (using the technical definition of 'language' as non-mutually intellig ...
, where the few fricatives that exist result from changes to plosives or approximants, but also occurs in some indigenous languages of
New Guinea New Guinea (; Hiri Motu Hiri Motu, also known as Police Motu, Pidgin Motu, or just Hiri, is a language of Papua New Guinea, which is spoken in surrounding areas of Port Moresby (Capital of Papua New Guinea). It is a simplified version of ...
and South America that have especially small numbers of consonants. However, whereas is ''entirely'' unknown in indigenous Australian languages, most of the other languages without true fricatives do have in their consonant inventory. Voicing contrasts in fricatives are largely confined to Europe, Africa, and Western Asia. Languages of South and East Asia, such as
Mandarin Chinese Mandarin (; ) is a group of Chinese (Sinitic) dialects that are natively spoken across most of northern and southwestern China. The group includes the Beijing dialect, the basis of the phonology of Standard Chinese, the official language ...
,
Korean Korean may refer to: People and culture * Koreans, ethnic group originating in the Korean Peninsula * Korean cuisine * Korean culture * Korean language **Korean alphabet, known as Hangul or Chosŏn'gŭl **Korean dialects and the Jeju language ** ...
, the Dravidian and Austronesian languages, typically do not have such voiced fricatives as and , which are familiar to many European speakers. These voiced fricatives are also relatively rare in indigenous languages of the Americas. Overall, voicing contrasts in fricatives are much rarer than in plosives, being found only in about a third of the world's languages as compared to 60 percent for plosive voicing contrasts. About 15 percent of the world's languages, however, have ''unpaired voiced fricatives'', i.e. a voiced fricative without a voiceless counterpart. Two-thirds of these, or 10 percent of all languages, have unpaired voiced fricatives but no voicing contrast between any fricative pair. This phenomenon occurs because voiced fricatives have developed from
lenition In linguistics, lenition is a sound change that alters consonants, making them more sonority hierarchy, sonorous. The word ''lenition'' itself means "softening" or "weakening" (from Latin 'weak'). Lenition can happen both synchronic analysis, s ...
of plosives or
fortition Fortition, also known as strengthening, is a consonantal change that increases the degree of stricture. It is the opposite of the more common lenition. For example, a fricative or an approximant may become a stop (i.e. becomes or becomes ). A ...
of approximants. This phenomenon of unpaired voiced fricatives is scattered throughout the world, but is confined to nonsibilant fricatives with the exception of a couple of languages that have but lack . (Relatedly, several languages have the voiced affricate but lack , and vice versa.) The fricatives that occur most often without a voiceless counterpart are – in order of ratio of unpaired occurrences to total occurrences – , , , and .


Acoustics

Fricatives appear in
waveforms In electronics, acoustics, and related fields, the waveform of a signal is the shape of its graph as a function of time, independent of its time and magnitude scales and of any displacement in time.David Crecraft, David Gorham, ''Electron ...
as somewhat random noise caused by the turbulent airflow, upon which a periodic pattern is overlaid if voiced. Fricatives produced in the front of the mouth tend to have energy concentration at higher frequencies than ones produced in the back. The centre of gravity (''CoG''), i.e. the average frequency in a spectrum weighted by the amplitude (also known as ''spectral mean''), may be used to determine the place of articulation of a fricative relative to that of another.


See also

*
Apical consonant An apical consonant is a phone (speech sound) produced by obstructing the air passage with the tip of the tongue (apex) in conjunction with upper articulators from lips to postalveolar, and possibly prepalatal. It contrasts with laminal cons ...
* Hush consonant *
Laminal consonant A laminal consonant is a phone (speech sound) produced by obstructing the air passage with the blade of the tongue, the flat top front surface just behind the tip of the tongue in contact with upper lip, teeth, alveolar ridge, to possibly, a ...
*
List of phonetics topics A * Acoustic phonetics * Active articulator * Affricate * Airstream mechanism * Alexander John Ellis * Alexander Melville Bell * Alfred C. Gimson * Allophone * Alveolar approximant () * Alveolar click () * Alveolar consonant * Alveolar ej ...


Notes


References


External links


Fricatives in English
{{DEFAULTSORT:Fricative Consonant Manner of articulation