The Akan dialects contain extensive
palatalization,
vowel harmony, and
tone terracing.
Consonants Before
front vowels, all Asante consonants are
palatalized (or
labio-palatalized), and the
stops are to some extent
affricated. The
allophones of are quite complex. In the table below, palatalized allophones which involve more than minor phonetic palatalization are specified, in the context of the vowel . These sounds do occur before other vowels, such as , though in most cases not commonly. In Asante, followed by a vowel is pronounced , but in
Akuapem it remains . The sequence is pronounced . A word final can be heard as a glottal stop . There is also a nasalization of and of as and , when occurring before nasal vowels. The transcriptions in the tables below are in the order /
phonemic/,
phonetic]. Note that orthographic is ambiguous; in textbooks, = may be distinguished from with a diacritic: '
. Likewise, velar () may be transcribed '. Orthographic is palatalized .
Vowels The Akan dialects have fourteen to fifteen vowels: four to five "tense" vowels (
advanced tongue root; +ATR or -RTR), five "lax" vowels (retracted tongue root, +RTR or -ATR), which are not entirely contrastively represented by the seven-vowel orthography, and five nasal vowels, which are not represented at all. All fourteen were distinguished in the
Gold Coast alphabet of the colonial era. A tongue-root distinction in orthographic
a is only found in some subdialects of Fante, but not in the literary form; in Asante and Akuapem there are harmonic allophones of , but neither is ATR. The two vowels written
e ( and ) and
o ( and ) are often not distinguished in pronunciation.
Tongue root harmony Akan vowels engage in a form of
vowel harmony with the root of the tongue. • +RTR vowels followed by the -RTR non-mid vowels /i a u/ become -RTR. This is generally reflected in the orthography: That is, orthographic ''
become i e a o u''. However, it is no longer reflected in the case of subject and possessive pronouns, giving them a consistent spelling. This rule takes precedence over the next one. • After the +RTR non-high vowels /e̙ a̙ o̙/, -RTR mid vowels /e o/ become +RTR high vowels /i̙ u̙/. This is not reflected in the orthography, for both sets of vowels are spelled , and in many dialects this rule does not apply, for these vowels have merged.
Tones Akan has three phonemic tones,
high (/H/),
mid (/M/), and
low (/L/). Initial syllable may only be
high or
low.
Tone terracing The phonetic pitch of the three tones depends on their environment, often being lowered after other tones, producing a steady decline known as
tone terracing. /H/ tones have the same pitch as a preceding /H/ or /M/ tone within the same tonic phrase, whereas /M/ tones have a lower pitch. That is, the sequences /HH/ and /MH/ have a level pitch, whereas the sequences /HM/ and /MM/ have a falling pitch. /H/ is lowered (
downstepped) after a /L/. /L/ is the default tone, which emerges in situations such as reduplicated prefixes. It is always at bottom of the speaker's pitch range, except in the sequence /HLH/, in which case it is raised in pitch but the final /H/ is still lowered. Thus /HMH/ and /HLH/ are pronounced with distinct but very similar pitches. After the first "prominent" syllable of a clause, usually the first high tone, there is a
downstep. This syllable is usually stressed. ==Morphology==