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+# Phonology
+
+<!-- toc -->
+
+## Consonants
+
+Main consonants are listed in the table below:
+
+|               | labial | alveolar | palatal | uvular    | glottal |
+|---------------|--------|----------|---------|-----------|---------|
+| **nasal**     | m      | n        | ɲ (*nj*)  | ŋ (*n*, *ng*) |         |
+| **plosive**   | p b    | t d      |         | k (*c*) ɡ (*g*)   | ʔ       |
+| **fricative** | f v    | s z      |         | x (*ch*) ɣ (*gh*) | h   |
+| **sonorant**  | w      | r l      | j       |           |         |
+
+Notes:
+
+- *n* is pronounced as /ŋ/ only if it is followed by another consonant
+- The glottal stop /ʔ/ is not written. It's implied when a syllable does not
+  have other consonants (similar to Vietnamese).
+- *nj* is pronounced as /ɲ/ even when the two letters are from different words.
+  The sames go for other digraphs (ng, ch, gh).  There is therefore no
+  ambiguous way of pronouncing a word given a romanization.
+- Some dialects may pronounce *s*, *z* as 
+
+## Vowels
+
+|       | front | centre | back |
+|-------|-------|--------|------|
+| open  | i     |        | u    |
+| mid   | e     | ə (*y*)| o    |
+| close | a     |        |      |
+
+Note: the schwa sound /ə/ is not written in the native script.  However, for
+ease of writing on computer, it is romanized as y.  Both kýn and ḱn are
+acceptable as the romanization for the same syllable.  This document is in
+favor of using explicit form instead of implicit form.
+
+### Diphthongs and long vowels
+
+Long vowels are written as duplicated vowels, with the second character having
+a diaresis (for example *aä* is pronounced /aː/). For vowels whose
+romanizations contain two characters, the later vowel is duplicated (for
+example, long version of *aë* is *aëë*)
+
+Diphthongs are written similarly. They're listed below:
+
+- aï /aɪ/
+- aü /aʊ/
+- eï /eɪ/
+- oï /oɪ/
+- uï /uɪ/
+
+## Tones
+
+There are three tones in Hàäsdáïga:
+
+- level tone (a) /˧˧/
+- rising tone (á) /˧˥/
+- falling tone (à) /˥˩/
+
+## Phonotactics
+
+Syllables in Hàäsdáïga have a simple structure: **CVT(C)**
+
+The final consonants can't be sonorants, /h/, /ʔ/, and voiced vowels if they
+have voiceless equivalents.  Other than that, there isn't any constraints.
+
+There are thus:
+
+\\( 22  × (6 × 2 + 6 )  × 3  × 11  = 18876  \\) (possible syllables)
+
+Note: These numbers mean:
+
+- 22 consonants
+- 6 vowels and their long version
+- 6 diphthongs
+- 3 tones
+- 10 final consonants