Comparison of ASCII encodings of the International Phonetic Alphabet

The International Phonetic Alphabet (IPA) consists of more than 100 letters and diacritics. Before Unicode became widely available, several ASCII-based encoding systems of the IPA were proposed. The alphabet went through a large revision at the Kiel Convention of 1989, and the vowel symbols again in 1993.[1] Systems devised before these revisions inevitably lack support of the additions they introduced.

Only language-neutral systems are discussed below because language-dependent ones do not allow for a systematic comparison.

General information
System Author(s) Created Last
updated		 Note Ref
Branner (unnamed) David Prager Branner at the University of Washington 1994 ? [2]
Millar & Oasa (unnamed) J. Bruce Millar and Hiroaki Oasa at Australian National University 1981 1981 [3]
PHONASCII George D. Allen at Purdue University 1988 1988 Not a direct mapping of the IPA. Segments are separated by spaces, and diacritics by commas. [4]
Praat Paul Boersma and David Weenink at the University of Amsterdam 1991 2013 [5]
UCLA Phonological Segment Inventory Database (UPSID) Ian Maddieson at the University of California, Los Angeles 1984 ? Presented here is the scheme used for representing phonemes in the database of phonological inventories. Consequently, it is not designed for transcription of multiple segments and does not have symbols for values not found phonemically in the languages sampled. [6]
Usenet IPA/ASCII transcription Participants in sci.lang and alt.usage.english newsgroups (later maintained by Evan Kirshenbaum at HP Labs) 1991 2011 Also known variously as "ASCII-IPA", "Kirshenbaum", etc.[7] [8]
Worldbet James L. Hieronymus at AT&T Bell Laboratories 1994 1994 Segments are separated by spaces. [9]
X-SAMPA John C. Wells at University College London 1995 2000 [10]

Symbols

Only the symbols in the latest IPA chart are included. The numbers in the leftmost column, according to which the symbols are sorted, are the IPA Numbers. Some of the IPA symbols to which a system lacks a corresponding symbol may still be represented in that system by use of a modifier (diacritic), but such combinations are not included unless the documentation explicitly assigns one for the value.

# IPA Branner M&O PHONASCII Praat UPSID Usenet Worldbet X-SAMPA Value
101 p p p p p p p p p Voiceless bilabial stop
102 b b b b b b b b b Voiced bilabial stop
103 t t t t t t t t t Voiceless alveolar stop
104 d d d d d d d d d Voiced alveolar stop
105 ʈ tr) t( tr \t. t. t. tr t` Voiceless retroflex stop
106 ɖ dr) d( dr \d. d. d. dr d` Voiced retroflex stop
107 c c c c c c c c c Voiceless palatal stop
108 ɟ j- J J \j- dj J^ J J\ Voiced palatal stop
109 k k k k k k k k k Voiceless velar stop
110 ɡ g g g \gs g g g g Voiced velar stop
111 q q q q q q q q q Voiceless uvular stop
112 ɢ G G G \gc G G Q G Voiced uvular stop
113 ʔ ? ? ? \?g ? ? ? ? Glottal stop
114 m m m m m m m m m Voiced bilabial nasal
115 ɱ m" m> mv \mj mD M M F Voiced labiodental nasal
116 n n n n n n n n n Voiced alveolar nasal
117 ɳ nr) n( nr \n. n. n. nr n` Voiced retroflex nasal
118 ɲ nj) n) nj \nj nj n^ n~ J Voiced palatal nasal
119 ŋ ng) g~ ng \ng N N N N Voiced velar nasal
120 ɴ N N N \nc nU n" Nq[lower-alpha 1] N\ Voiced uvular nasal
121 ʙ B bb \bc b<trl> B B\ Voiced bilabial trill
122 r r r rr r r r<trl> r r Voiced alveolar trill
123 ʀ R R RR \rc R r" R R\ Voiced uvular trill
124 ɾ r" r* dt \fh r[ * d( 4 Voiced alveolar tap
125 ɽ rr) r(* rt \f. r.[ *. rr r` Voiced retroflex flap
126 ɸ P" F F \ff P P F p\ Voiceless bilabial fricative
127 β B" B V \bf B B V B Voiced bilabial fricative
128 f f f f f f f f f Voiceless labiodental fricative
129 v v v v v v v v v Voiced labiodental fricative
130 θ O- s[] sd \tf 0D T T T Voiceless dental fricative
131 ð d- z[] zd \dh 6D D D D Voiced dental fricative
132 s s s s s s s s s Voiceless alveolar fricative
133 z z z z z z z z z Voiced alveolar fricative
134 ʃ S sV S \sh S S S S Voiceless palato-alveolar fricative
135 ʒ 3" zV Z \zh Z Z Z Z Voiced palato-alveolar fricative
136 ʂ sr) s( sr \s. s. s. sr S` Voiceless retroflex fricative
137 ʐ zr) z( zr \z. z. z. zr Z` Voiced retroflex fricative
138 ç c" c$ c\ \c, C C C C Voiceless palatal fricative
139 ʝ j" j$ J\ \jc jF C<vcd> j^[lower-alpha 1] J\ Voiced palatal fricative
140 x x x x x x x x x Voiceless velar fricative
141 ɣ g" r=< g\ \gf gF Q G G Voiced velar fricative
142 χ X X X \cf X X X X Voiceless uvular fricative
143 ʁ R% R= G\[lower-alpha 2] \ri RF g" K R Voiced uvular fricative
144 ħ h- h< H \h- H H H X\ Voiceless pharyngeal fricative
145 ʕ ?& 6< Hv \9e 9 H<vcd> ! ?\ Voiced pharyngeal fricative
146 h h h h h h h h h Voiceless glottal fricative
147 ɦ h" 6 hv \h^ hh h<?> hv[lower-alpha 1] h\ Voiced glottal fricative
148 ɬ l- l%$ ls \l- hlF s<lat> or L[lower-alpha 3] hl[lower-alpha 1] K Voiceless alveolar lateral fricative
149 ɮ l3") l$ lz \lz lF z<lat> Zl[lower-alpha 1] K\ Voiced alveolar lateral fricative
150 ʋ v" v> \vs vA r<lbd> V[[lower-alpha 1] P or V\ Voiced labiodental approximant
151 ɹ r& r= r \rt rA r 9 r\ Voiced alveolar approximant
152 ɻ jr) r=( \r. r.A r. 9r r\` Voiced retroflex approximant
153 j j j j j j j j j Voiced palatal approximant
154 ɰ m&" Rg \ml RA j<vel> 4)[lower-alpha 1] M\ Voiced velar approximant
155 l l l l l l l l l Voiced alveolar lateral approximant
156 ɭ lr) l( lr \l. l. l. lr l` Voiced retroflex lateral approximant
157 ʎ y& l) lj \yt lj l^ L L Voiced palatal lateral approximant
158 ʟ L \lc L L[lower-alpha 3] Lg[lower-alpha 1] L\ Voiced velar lateral approximant
160 ɓ b$ b,, b? \b^ b< b` b< b_< Voiced bilabial implosive
162 ɗ d$ d,, d? \d^ d< d` d< d_< Voiced alveolar implosive
164 ʄ j$ J,, J? \j^ dj< J` J< J\_< Voiced palatal implosive
166 ɠ g$ g,, g? \g^ g< g` g< g_< Voiced velar implosive
168 ʛ G$ G,, G? \G^ G< G` Q< G\_< Voiced uvular implosive
169 ʍ w& \wt hw v<vls> W W Voiceless labial–velar fricative
170 w w w w w w w w w Voiced labial–velar approximant
171 ɥ h& w. \ht wj j<rnd> jw[lower-alpha 1] H Voiced labial–palatal approximant
172 ʜ H \hc H\ Voiceless epiglottal trill
173 ʡ ?- \?- 99 >\ Epiglottal stop
174 ʢ ?" \9- <\ Voiced epiglottal trill
175 ɧ Sx) \hj x\ Sj-sound
176 ʘ p! p* \O. p! O\ Bilabial click
177 ǀ t! t* t! 1 / t! \ Dental click
178 ǃ r! ! ! c![lower-alpha 4] !\ Alveolar click
179 ǂ c! c* c! - /= c![lower-alpha 4] =\ Palatal click
180 ǁ l! l* l! 2 # l! || \|\ Alveolar lateral click
181 ɺ l" lt \rl l[ *<lat> l) l\ Voiced alveolar lateral flap
182 ɕ ci) sV> ss \cc SJ c} s\ Voiceless alveolo-palatal fricative
183 ʑ zi) zV> zz \zc ZJ z} z\ Voiced alveolo-palatal fricative
184 ⱱ v[ Voiced labiodental flap
209 ɫ l~) l- \l~ l- L[lower-alpha 3] 5 Velarized alveolar lateral approximant
301 i i i i i i i i i Close front unrounded vowel
302 e e e e e e e e e Close-mid front unrounded vowel
303 ɛ E E E \ef E E E E Open-mid front unrounded vowel
304 a a a a a a a a a Open front unrounded vowel
305 ɑ a" A aa \as a_ A A A Open back unrounded vowel
306 ɔ c& O O \ct O O > O Open-mid back rounded vowel
307 o o o o o o o o o Close-mid back rounded vowel
308 u u u u u u u u u Close back rounded vowel
309 y y y or i! y y y y y y Close front rounded vowel
310 ø o/) 0 or e! oe \o/ o/ Y 7 2 Close-mid front rounded vowel
311 œ oe) E! oE \oe E) W 8 9 Open-mid front rounded vowel
312 ɶ OE) a! OE \Oe &. 6 & Open front rounded vowel
313 ɒ a"& A= or A! ao \ab a_) A. 5 Q Open back rounded vowel
314 ʌ v& ^, V= or O! A \vt ^ V ^ V Open-mid back unrounded vowel
315 ɤ U" o! oo \rh o( o- 2 7 Close-mid back unrounded vowel
316 ɯ m& m= or u! uu \mt uu u- 4 M Close back unrounded vowel
317 ɨ i- i" i- \i- i_ i" ix 1 Close central unrounded vowel
318 ʉ u- u" u- \u- u+ u" ux } Close central rounded vowel
319 ɪ I I I \ic I I I I Near-close front unrounded vowel
320 ʏ Y Y Y \yc Y U. Y Y Near-close front rounded vowel
321 ʊ U U U \hs U U U U Near-close back rounded vowel
322 ə @ e= 6 \sw "@ @ & @ Mid central vowel
323 ɵ o- o" \o- @) @. ox 8 Close-mid central rounded vowel
324 ɐ a& \at 4 ax 6 Near-open central vowel
325 æ ae) @ ae \ae aa & @ { Near-open front unrounded vowel
326 ɜ E& E" 3 \er 3 V" 3 3 Open-mid central unrounded vowel
327 ɚ xr^ 3r \sr "@. R @` R-coloured mid central vowel
395 ɞ E" O" \kb 3) O" 3\ Open-mid central rounded vowel
397 ɘ e& e" 6 \e- @ @<umd> @\ Close-mid central unrounded vowel
401 ◌ʼ ` ? \ap ' ` > _> Ejective
402A ◌̥ V) % ,-v \0v <o> 0 _0 Voiceless
402B ◌̊ \0^
403 ◌̬ v) ,+v <vcd> v _v Voiced
404 ʰ h^ HH ,h \^h h <h> h _h Aspirated
405 ◌̤ h") ,hv \:v h <?> Hv _t Breathy voiced
406 ◌̰ ~ ,?v \~v * ? _k Creaky voiced
407 ◌̼ { { _N Linguolabial
408 ◌̪ [ [ ,d \Nv [ [ _d Dental
409 ◌̺ ] ,ap \Uv ] _a Apical
410 ◌̻ [] ,lm \Dv } _m Laminal
411 ◌̹ u) } ,+w \3v . (w)[lower-alpha 1] _O More rounded
412 ◌̜ U) { \cv - _c Less rounded
413 ◌̟ + + ,< or ,fr \+v + _+ Advanced
414 ◌̠ _ -[lower-alpha 5] ,> or ,bk \-v - _- Retracted
415 ◌̈ "^ " \:^ " _" Centralized
416 ◌̽ x^ _x Mid-centralized
417 ◌̘ < \T( ¿[lower-alpha 1][lower-alpha 6] _A Advanced tongue root
418 ◌̙ > \T) ¡[lower-alpha 1][lower-alpha 6] _q Retracted tongue root
419 ◌˞ r^ \hr . <r> ` Rhoticity
420 ʷ w^ ,V\ \^w W <w> w _w Labialized
421 ʲ j^ . ,j \^j J <pzd> j ' or _j Palatalized
422 ˠ g^ ,g \^G - <vzd> 2 _G Velarized
423 ˤ &g^ ,H \^9 9 <H> ! _?\ Pharyngealized
424 ◌̃ ~^ ~ ,+n \~^ ~ ~ ~ ~ or _~ Nasalized
425 ⁿ n^ ,n- \^n n n _n Nasal release
426 ˡ l^ ,l- \^l L l _l Lateral release
427 ◌̚ .) ,= \cn <unx> c _} No audible release
428 ◌̴ ~) -[lower-alpha 5] _e Velarized or pharyngealized
429 ◌̝ = .[lower-alpha 7] ,/ or ,up \T^ _r Raised
430 ◌̞ =" ( ,\ or ,dn \Tv _o Lowered
431 ◌̩ ,) \ ,$ v - = = or _= Syllabic
432 ◌̯ ( *[lower-alpha 8] ,gl \nv ( _^ Non-syllabic
433 ◌͡◌ ))[lower-alpha 9] _ \lip _ Affricate or double articulation
◌͜◌
501 ˈ ' ' $S5 \'1 ' ` " Primary stress
502 ˌ , ` $S3 \'2 , ' % Secondary stress
503 ː : ,: \:f : : : : Long
504 ˑ ; : ,. \.f ; :\ Half-long
505 ◌̆ (^ *[lower-alpha 8] ,-- \N^ S ( _X Extra-short
506 . . $ . # . . Syllable break
507 Minor (foot) group
508 ‖ || || || Major (intonation) group
509 ‿ =) \_ub -\ Linking (absence of a break)
510 ↗ / </> or <R> Global rise
511 ↘ \ <\> or <F> Global fall
512 ◌̋ 5 5 $T5- _9 _T Extra-high
513 ◌́ 4 4 $T4- \'^ _7 _H High
514 ◌̄ 3 3 $T3- \-^ _5 _M Mid
515 ◌̀ 2 2 $T2- \`^ _3 _L Low
516 ◌̏ 1 1 $T1- _1 _B Extra-low
517 ꜛ /) ^ Upstep
518 ꜜ \) ! Downstep
519 ˥ 5 5 $T5- <T> Extra-high
520 ˦ 4 4 $T4- <H> High
521 ˧ 3 3 $T3- <M> Mid
522 ˨ 2 2 $T2- <L> Low
523 ˩ 1 1 $T1- <B> Extra-low
524 ◌̌ 15 15 $1/ \v^ _L_H, _R or _/ Rising
525 ◌̂ 51 51 $5\ \^^ _H_L, _F or _\ Falling
526 ◌᷄ 35 35 $3/ _H_T High-rising
527 ◌᷅ 13 13 $3\ _B_L Low-rising
528 ◌᷈ 342 342 $T3^ _M_H_L, _R_F or _/_\ Rising–falling

Coverage
Scope Branner Millar & Oasa PHONASCII Praat UPSID Usenet Worldbet X-SAMPA
Consonants (80) 79 (99%) 69 (86%) 67 (84%) 79 (99%) 75 (94%) 73 (91%) 73 (91%) 79 (99%)
Vowels (29) 29 (100%) 27 (93%) 26 (90%) 29 (100%) 28 (97%) 28 (97%) 26 (90%) 29 (100%)
Diacritics (35) 34 (97%) 15 (43%) 25 (71%) 29 (83%) 12 (34%) 17 (49%) 25 (71%) 26 (74%)
Suprasegmentals (28) 28 (100%) 20 (71%) 21 (75%) 14 (50%) 2 (7%) 4 (14%) 11 (39%) 28 (100%)
Total (172) 170 (99%) 131 (76%) 139 (81%) 151 (88%) 117 (68%) 122 (71%) 135 (78%) 162 (94%)

See also

Notes
  1. In Worldbet, these combinations are given as merely proposed for values "for which no machine-readable coding has yet been proposed".
  2. The uvular approximant is represented by R in PHONASCII.
  3. L represents either a voiceless alveolar lateral fricative, a velar approximant, or a velarized alveolar lateral approximant in the Usenet IPA/ASCII transcription.
  4. c! represents either an alveolar or palatal click in the Usenet IPA/ASCII transcription.
  5. - represents either retracted or "velarized or pharyngealized" in Millar & Oasa's system.
  6. ¿ and ¡ are not part of ASCII, but are nonetheless proposed as encoding advanced and retracted tongue root, respectively, in Worldbet.
  7. . represents either raised or palatalized in Millar & Oasa's system.
  8. * represents either non-syllabic or extra-short in Millar & Oasa's system.
  9. )) representing a tie bar is placed after both segments, as in ts)), in Branner's system.

References
  1. International Phonetic Association (1993). "Council actions on revisions of the IPA". Journal of the International Phonetic Association. 23 (1): 32–34. doi:10.1017/S002510030000476X.
  2. Branner, David Prager (1994). "Proposal for an ASCII Version of the IPA". University of Washington. Archived from the original on 9 February 1999.
  3. Millar, J. B.; Oasa, H. (1981). "Proposal for ASCII coded phonetic script". Journal of the International Phonetic Association. 11 (2): 62–74. doi:10.1017/S0025100300002279.
  4. Allen, George D. (1988). "The PHONASCII system". Journal of the International Phonetic Association. 18 (1): 9–25. doi:10.1017/S0025100300003509.
  5. Boersma, Paul; Weenink, David (4 August 2009). "Phonetic symbols". Praat.
  6. Reetz, Henning (23 May 2018). "Simple UPSID interface". Universität Frankfurt.
  7. Gómez-Vilda, Pedro; Ferrández-Vicente, José Manuel; Rodellar-Biarge, Victoria; Álvarez-Marquina, Agustín; Mazaira-Fernández, Luis Miguel; Martínez-Olalla, Rafael; Muñoz-Mulas, Cristina (2009). "Detection of Speech Dynamics by Neuromorphic Units". In Mira, José; Ferrández, José Manuel; Álvarez, José R.; de la Paz, Félix; Toledo, F. Javier (eds.). Methods and Models in Artificial and Natural Computation: A Homage to Professor Mira's Scientific Legacy – Third International Work-Conference on the Interplay Between Natural and Artificial Computation, IWINAC 2009, Santiago de Compostela, Spain, June 22-26, 2009, Proceedings, Part I. Springer. pp. 67–78. doi:10.1007/978-3-642-02264-7_8. ISBN 978-3-642-02263-0. Page 74.
  8. Kirshenbaum, Evan (6 September 2011). "Representing IPA phonetics in ASCII" (PDF). Archived from the original (PDF) on 19 April 2016.
  9. Hieronymus, James L. (1994). "ASCII Phonetic Symbols for the World's Languages: Worldbet". AT&T Bell Laboratories Technical Memorandum. CiteSeerX 10.1.1.225.9914.
  10. Wells, John (3 May 2000). "Computer-coding the IPA: a proposed extension of SAMPA". University College London.
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