TheExtensions to the International Phonetic Alphabet for Disordered Speech, commonly abbreviatedextIPA/ɛkˈstaɪpə/,^[1] are a set of letters and diacritics devised by theInternational Clinical Phonetics and Linguistics Association to augment theInternational Phonetic Alphabet for the phonetic transcription ofdisordered speech. Some of the symbols are used for transcribing features of normal speech in IPA transcription, and are accepted as such by theInternational Phonetic Association.^[a]

Many sounds found only in disordered speech are indicated with diacritics, though an increasing number of dedicated letters are used as well. Special letters are included to transcribe the speech of people withlisps andcleft palates. The extIPA repeats several standard-IPA diacritics that are unfamiliar to most people but transcribe features that are common in disordered speech. These includepreaspiration ⟨ʰ◌⟩,linguolabial ⟨◌̼⟩,laminal fricatives[s̻,z̻], and ⟨*⟩ for a sound (segment or feature) with no available symbol (letter or diacritic). The novel transcription ⟨ɹ̈⟩ is used for an Englishmolar-r, as opposed to ⟨ɹ̺⟩ for an apical r; these articulations are indistinguishable in sound and so are rarely identified in non-disordered speech.

Sounds restricted to disordered speech includevelopharyngeals,nasal fricatives (a.k.a. nareal fricatives) and some of thepercussive consonants. Sounds sometimes found in the world's languages that do not have symbols in the basic IPA includedenasals, thesublaminal percussive, palatal and velarlateral fricatives, and fricatives that are simultaneously lateral and sibilant.

ExtIPA was revised and expanded in 2015; the new symbols were added to Unicode in 2021.^[2]

The non-IPA letters found in the extIPA are listed in the following table.VoQS letters may also be used, as in ⟨ↀ͡r̪͆⟩ for abuccal interdental trill (araspberry), as VoQS started off as a subset of extIPA.^[3]

Several letters and superscript forms were added to Unicode 14 and 15. They are included in the freeGentium Plus andAndika fonts.

The extIPA has explicitly endorsed some rarer uses of regular IPA diacritics, such as[ʰp] for pre-aspiration, and has added some new ones, such as[tʶ] for uvularization. Some of these extIPA diacritics are occasionally used for non-disordered speech, for example for the unusual airstream mechanisms ofDamin.

One extension of regular IPA is the use of parentheses around diacritics to indicate partial application of that diacritic: a pair of parentheses around a diacritic indicates that the diacritic only partially applies (in degree or duration), while a single parenthesis at the left or right of the diacritic indicates that the segment is partially affected at its beginning or end. These conventions may be convenient for representing variousvoice onset times. Phonation diacritics may also be prefixed or suffixed to represent relative timing beyond the segment (pre- and post-voicingetc.). The following are examples; in principle, any IPA or extIPA diacritic may be parenthesized or displaced in this manner.^[3]

The transcriptions for partial voicing and devoicing may be used in either the sense of degrees of voicing or in the sense that the voicing is discontinuous. For the former, both parentheses indicate the sound is mildly (partially) voiced throughout, and single parentheses mean a partial degree of voicing at the beginning or end of the sound. For the latter, both parentheses mean the sound is (de)voiced in the middle, while the single parentheses mean complete (de)voicing at the beginning or end of the sound. The implication is that such voicing or devoicing is atypical of the language being spoken. For example, ⟨z̥⟩ would be used for the usual devoicing or partial devoicing of the language, while ⟨z̥᪽⟩ would indicate that the transcriber found the devoicing to be atypical, as in pathological speech. Similarly, ⟨z̥᫃⟩ would indicate atypical devoicing at the beginning of the segment.^[4] However, some authors use the parentheses for typical devoicing in close transcription. For example, theBardi wordaamba 'man', with the usual initial and final devoicing of that language, has been transcribed[ɐ̥͡ɐmbə̥᫄].^[5]

Altering the position of a diacritic relative to the letter indicates that the phonation begins before the consonant or vowel does or continues beyond it. The voiceless ring and other phonation diacritics can be used in the same way if needed. For example, ⟨p˳a⟩ indicates that voicelessness continues past the[p], more or less equivalent to ⟨pʰa⟩.

Other extIPA diacritics are:^[3]

Diacritics may be placed within parentheses as the voicing diacritics are above. For example, ⟨m͊᪻⟩ indicates a partially denasalized[m].

The arrow for sliding articulation was first used for[wɑət̪s̪͢θ] for 'watch' and[z̪͢ðɪpʊə] for 'zipper'. It is most commonly observed in quick changes from the blade to the tip of the tongue (laminal to apical) in plosives and fricatives, such as[t̪͢t] and[t͢θ], or vice versa, but is not limited to that; the consonants may also be labial or dorsal, e.g.[ɸ͢f] and[k͢q].^[8]

The slit-grooved distinction of the channel shape of front fricatives may be handled with these diacritics, with for example ⟨s̪z̪⟩ for grooved (sibilant) dental fricatives, and ⟨θ͇ð͇⟩ for ungrooved (non-sibilant) aveolar fricatives. This is a common topic in speech pathology, though ⟨s̪z̪⟩ occur in non-pathological speech in some languages.^[8]

Any IPA letter may be used in superscript form as a diacritic, to indicate the onset, release or 'flavor' of another letter. In extIPA, this is provided specifically for the fricative release of a plosive. For example, ⟨k𐞜⟩ is[k] with a lateral-fricative release (similar to the velar lateral affricate[k͜𝼄], but with less frication); ⟨d𐞚⟩ is[d] with lateral-plus-central release. Combining diacritics can be added to superscript diacritics, such as ⟨tʰ̪͆⟩ for[t] with bidental aspiration.

TheVoQS (voice-quality symbols) take IPA and extIPA diacritics, as well as several additional diacritics that are potentially available for extIPA transcription. The subscript dot for 'whisper' is sometimes found in IPA transcription,^[9] though in IPA the diacritic has also been used for apical-retroflex articulation.

The Extended IPA has adopted bracket notation from conventions transcribing discourse. Parentheses are used to indicatemouthing (silent articulation), as in the common silent sign to hush(ʃːː). Parentheses are also used to indicate silent pauses, for example (...); the length of the pause may be indicated, as in (2.3 sec). A very short (.) may be used to indicate an absence of co-articulation between adjacent segments, for instance[t(.)weɫv̥] rather than[tʷw̥eɫv̥].^[10]

Double parentheses indicate that transcription is uncertain because of extraneous noise or speech, as when one person talks over another. As much detail as possible may be included, as in ⸨2 syll.⸩ or ⸨2σ⸩ for two obscured syllables.^[11] This is also IPA usage.^[12] Sometimes the obscuring noise will be indicated instead, as in ⸨cough⸩ or ⸨knock⸩, as in the illustrative transcription below; this notation may be used for extraneous noise that does not obscure speech, but which the transcriber nonetheless wishes to notate (e.g. because someone says 'excuse me' after coughing, or verbally responds to the knock on the door, and the noise is thus required to understand the speech).

In the extIPA, indistinguishable/unidentifiable sounds are circled rather than placed in single parentheses as in IPA.^[l] An empty circle, ◯, is used for an indeterminate segment,◯ σ  an indeterminate syllable, Ⓒ a segment identifiable only as a consonant, etc. Full capital letters, such as C in Ⓒ, are used aswild-cards for certain categories of sounds, and may combine with IPA and extIPA diacritics. For example,◯ P̥   indicates an undetermined or indeterminate voiceless plosive. Regular IPA and extIPA letters may also be circled to indicate that their identification is uncertain. For example, ⓚ indicates that the segment is judged to probably be[k]. This is effectively acopy-edit mark, and may be elongated into an oval for longer strings of symbols. This was illustrated in the 1997 edition of the chart, where the circle was typeset as ( ̲̅) and longer strings as e.g. (a̲̅a̲̅a̲̅). There is no way to typeset this in Unicode that does not require spurious characters between the letters (as here), but it may be graphically approximated with an unused set of brackets, such as ⦇aaa⦈.

Curly brackets with Italian musical terms are used for phonation and prosodic notation, such as[{_falsettoˈhɛlp_falsetto}] and terms for thetempo anddynamics of connected speech. These are subscripted within a {curly brace} notation to indicate that they are comments on the intervening text. TheVoQS conventions use similar notation for voice quality. These may be combined, for example with VoQS⟨F⟩ for 'falsetto':

{_allegro I {F {_𝆏 didn't_𝆏} know that F}_allegro}

or

[{_allegroə{F{_𝆏dɪn_𝆏}nəʊðæʔF}_allegro}]^[10]

Three rows appear in the extIPA chart that do not occur in the IPA chart: "fricative lateral + median" (simultaneous grooved and lateral frication), "fricative nasal" (a.k.a. nareal fricative) and "percussive". Adenasal row is added here. Several new columns appear as well, though the linguolabial column is the result of a standard-IPA diacritic. Dorso-velar and velo-dorsal are combined here, as are upper and lower alveolar.

The customary use of superscript IPA letters is formalized in the extIPA, specifically for fricative releases of plosives, as can be seen in the lower-left of the full chart.

Speech pathologists also often use superscripting to indicate that a target sound has not been reached – for example,[ˈtʃɪᵏən] for an instance of the word 'chicken' where the/k/ is incompletely articulated. However, due to the vague meaning of superscripting in the IPA, this is not a convention supported by the ICPLA. An unambiguous transcription would mark the consonant more specifically as weakened ([ˈtʃɪk͉ən]) or silent ([ˈtʃɪ(k)ən]).

A sample transcription of a written text read aloud, using extIPA andVoice Quality Symbols:^[13]

[ð\ðːə̤{V̰ə\ə\əV̰}ˈhw̥əɹldˈkʌpˈf̆\faɪnəlzəvˈnaɪntineəti{↓_𝑝ˈtʉ̆_𝑝↓}ˌɑɹˈh\hɛldɪnsːp\ˈsːp\ʰeᵊnˈðɪsjəɹ(3sec)ð͈ːewɪlɪnv\ˈv͈ːɔlvðətˢˑ\tʴ̥(.){_𝑝tʼ\tʼ_𝑝}ʩ\{_𝑓ʩ\ʩ_𝑓}\ˈt͈ɒ̆p̚ˈneʃənzəvðəˈwəɹldɪnˑə̰{_𝑝𝑝tʰˑəʃ\t̆ʰə\təʃ_𝑝𝑝}\ˈt͈ʉɹnəməntˈlastɪnˌoʊvərˈfɔɹˈwiks(..)ˈh͈ɛldə\ʔatˈf\fɔɹtin(...){_𝑝𝑝V̰d\dV̰_𝑝𝑝}\ˈdɪfɹəntˈsɛn{↓təɹʐ↓}ɪnˈspeᵊn(3sec)ə̰(.)ˈɔləvðəfˑ\fˈɔləvðəˈfəɹʂtˈɹaʉndˈɡeᵊmzwɪlbi(..)wɪlbi(.)ɪnðə(.)w̰̆ə̰ːp\pɹəv\ˈvɪnʃəl{_𝑝tʼ\tʼ_𝑝}\{_𝑝𝑝tʼ\tʼ_𝑝𝑝}(.)tʼ\tʼ(..){_𝑝𝑝tʼ\tʼ_𝑝𝑝}ʩ\ʩ\{↓ˈtãʉ̃nz↓}wɪððəs͢ːsʼ\sʼ\ˈs{↓ɛmiˈfaɪnəlz↓}andˈf\faɪnəlzˈhɛldɪn(.)⸨knockondoor⸩bɑɹsə{_𝑝ˈloʊnəandˈmədɹɪd_𝑝}]

Original text: "The World Cup Finals of 1982 are held in Spain this year. They will involve the top nations of the World in a tournament lasting over four weeks, held at fourteen different centers in Spain. All of the first-round games will be in the provincial towns with the semi-finals, and finals held in Barcelona and Madrid."^[13]

• Voice Quality Symbols
• Sinological extensions to the International Phonetic Alphabet
• Phonetic symbols in Unicode

• Ball, Martin J. (1993)."Further to Articulatory Force and the IPA Revisions".Journal of the International Phonetic Association.23 (1):39–41.doi:10.1017/S0025100300004783.S2CID 143614464.
• Ball, Martin J.;Esling, John H.; Dickson, Craig (December 1995). "The VoQS System for the Transcription of Voice Quality".Journal of the International Phonetic Association.25 (2):71–80.doi:10.1017/S0025100300005181.S2CID 145791575.
• Ball, Martin J.;Howard, Sara J.; Miller, Kirk (2018). "Revisions to the extIPA chart".Journal of the International Phonetic Association.48 (2):155–164.doi:10.1017/S0025100317000147.S2CID 151863976.
• Ball, Martin J.; Lowry, Orla M. (2001). "Transcribing Disordered Speech".Methods in Clinical Phonetics. London: Whurr. pp. 25–40, 80.doi:10.1002/9780470777879.ch3.ISBN 9781861561848.S2CID 58518097.
• Bennett, William G. (2020). "Click Phonology". In Sands, Bonny (ed.).Click Consonants. Empirical Approaches to Linguistic Theory. Vol. 15. Brill. pp. 74–128.doi:10.1163/9789004424357_003.ISBN 978-90-04-23268-6.S2CID 243697259.
• Duckworth, Martin; Allen, George; Hardcastle, William;Ball, Martin J. (1990). "Extensions to the International Phonetic Alphabet for the transcription of atypical speech".Clinical Linguistics and Phonetics.4 (4). International Clinical Phonetics and Linguistics Association:273–280.doi:10.3109/02699209008985489.
• Hesselwood, Barry;Howard, Sara (2008). "Clinical Phonetic Transcription". InBall, Martin J.; Perkins, Michael R.;Müller, Nicole; Howard, Sara (eds.).The handbook of Clinical Linguistics. Malden, MA: Blackwell.doi:10.1002/9781444301007.ch23.ISBN 9781405135221.
• International Phonetic Association (1999).Handbook of the International Phonetic Association : a guide to the use of the International Phonetic Alphabet. Cambridge, UK: Cambridge University Press.ISBN 9780521637510.
• Ladefoged, Peter (1971).Preliminaries to linguistic phonetics. Chicago, IL: University of Chicago Press.ISBN 0-226-46787-2.LCCN 75-179318.
• Laver, John (1994).Principles of phonetics. Cambridge Textbooks in Linguistics. Cambridge, UK: Cambridge University Press.doi:10.1017/CBO9781139166621.ISBN 9781139166621.
• van der Voort, Hein (2005). "Kwaza in a Comparative Perspective".International Journal of American Linguistics.71 (4). University of Chicago Press:365–412.doi:10.1086/501245.S2CID 224808983.

• Chart of extended IPA symbols for disordered speech (PDF, revised to 2015)
• Pronunciation videos of consonants in the main extIPA chart as of 2008

• International Phonetic Alphabet
• Communication disorders
• 1989 introductions

• Pages with plain IPA
• Articles with short description
• Short description is different from Wikidata