Phoneme Support#

English-US#

The latest EN-US TTS models support 35 phones and two stress symbols natively. An additional two phones are converted to supported phones, six diphthongs, two affricates, and seven r-colored vowels are supported. For details, refer to the Converted Phones section.

Phonemes#

IPA symbol

example

ɑ

obstinate, poppy

æ

active, cat, nah

ə

ago, woman, area

ɔ

orange, cause, Utah

ʊ

book

ɪ

if, fill

ɛ

every, pet, meh

ɝ

earth, bird, fur

i

eat, feel, valley

u

Uber, boost, too

a

For use in diphthongs

e

For use in diphthongs

o

For use in diphthongs

b

big, number, crab

t

talk, capital, sought

ʃ

she, abbreviation, rush

d

dog, random, rod

ð

then, mother, smooth

f

fork, left, half

ɡ

good, ago, drag

h

help, enhance, a-ha!

k

cut, slacker, Iraq

l

lid, palace, chill

m

map, camera, room

n

snow, tent, chicken

ŋ

link, sing

p

put, happen, flap

ɹ

red, borrow, tar

s

sit, risk, facts

θ

thin, empathy, month

v

value, event, love

w

with, always

j

yard, onion

z

zap, busy, kids

ʒ

jump, pleasure, garage

Stresses#

The following stress symbols are supported:

  • ˈ

  • ˌ

Converted Phones#

Two phones, ʌ and ɚ are not natively supported in the model, but are converted to ə and ɝ respectively. Diphthongs and affricates are treated as two separate phones. For example, aʊ becomes a,ʊ.

The following diphthongs are supported:

  • aʊ

  • aɪ

  • eɪ

  • oʊ

  • ɔɪ

  • ju

The following affricates are supported:

  • tʃ

  • dʒ

R-colored vowels are treated as separate phones; similar to diphthongs and affricates. The following r-colored vowels are supported:

  • ɪɹ

  • ɛɹ

  • ʊɹ

  • aɪɹ

  • aʊɹ

  • ɔɹ

  • ɑɹ

Lastly, we do not support vowel length. Phones such as ɑː will be treated as ɑ.