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docs: Document the lexical set transcriptions used by the en language files.

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Reece H. Dunn
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@@ -15,60 +15,66 @@ Sets<sup>\[<a href="#ref1">1</a>\]</sup>. These were created by Wells in 1982
by comparing the Received Pronunciation British (RP) and General American
(GenAm) accents in use at that time.
The `en` transcriptions listed below are the phonemes used by eSpeak NG to
transcribe the different lexical sets.
## Short Vowels
| Lexical Set | RP | GenAm |
|-------------|-------|-------|
| KIT | ɪ | ɪ |
| DRESS | e | ɛ |
| TRAP | æ | æ |
| LOT | ɒ | ɑ |
| STRUT | ʌ | ʌ |
| FOOT | ʊ | ʊ |
| Lexical Set | en | RP | GenAm |
|-------------|-------|-------|-------|
| KIT | `I` | ɪ | ɪ |
| DRESS | `E` | e | ɛ |
| TRAP | `a` | æ | æ |
| LOT | `0` | ɒ | ɑ |
| STRUT | `V` | ʌ | ʌ |
| FOOT | `U` | ʊ | ʊ |
## Long Vowels
| Lexical Set | RP | GenAm |
|-------------|-------|-------|
| FLEECE | iː | i |
| PALM | ɑː | ɑ |
| THOUGHT | ɔː | ɔ |
| GOOSE | uː | u |
| Lexical Set | en | RP | GenAm |
|-------------|-------|-------|-------|
| FLEECE | `i:` | iː | i |
| PALM | `A:` | ɑː | ɑ |
| THOUGHT | `O:` | ɔː | ɔ |
| GOOSE | `u:` | uː | u |
## Rhotic Vowels
These are vowels that are followed by an `r` that is not part of the next syllable
when considering the root form of the word containing that vowel.
| Lexical Set | RP | GenAm |
|-------------|-------|-------|
| NURSE | ɜː | ɝ |
| START | ɑː | ɑɹ |
| NORTH | ɔː | ɔɹ |
| FORCE | ɔː | oɹ |
| CURE | ʊə̯ | ʊɹ |
| NEAR | ɪə̯ | ɪɹ |
| SQUARE | eə̯ | ɛɹ |
| Lexical Set | en | RP | GenAm |
|-------------|-------|-------|-------|
| NURSE | `3:` | ɜː | ɝ |
| START | `A@` | ɑː | ɑɹ |
| NORTH | `O@` | ɔː | ɔɹ |
| FORCE | `o@` | ɔː | oɹ |
| CURE | `U@` | ʊə̯ | ʊɹ |
| NEAR | `i@3` | ɪə̯ | ɪɹ |
| SQUARE | `e@` | eə̯ | ɛɹ |
__NOTE:__ `/i@3/` is used for the NEAR lexical set to differentiate it from
`/i@/` used in words like `million`.
## Reduced Vowels
These are unstressed vowels that differ from the vowels in the main lexical sets.
| Lexical Set | RP | GenAm |
|-------------|-------|-------|
| HAPPY | ɪ | i |
| COMMA | ə | ə |
| LETTER | ə | ɚ |
| Lexical Set | en | RP | GenAm |
|-------------|-------|-------|-------|
| HAPPY | `i` | ɪ | i |
| COMMA | `@` | ə | ə |
| LETTER | `3` | ə | ɚ |
## Diphthongs
| Lexical Set | RP | GenAm |
|-------------|-------|-------|
| FACE | eɪ̯ | eɪ̯ |
| PRICE | aɪ̯ | aɪ̯ |
| CHOICE | ɔɪ̯ | ɔɪ̯ |
| GOAT | əʊ̯ | oʊ̯ |
| MOUTH | aʊ̯ | aʊ̯ |
| Lexical Set | en | RP | GenAm |
|-------------|-------|-------|-------|
| FACE | `eI` | eɪ̯ | eɪ̯ |
| PRICE | `aI` | aɪ̯ | aɪ̯ |
| CHOICE | `OI` | ɔɪ̯ | ɔɪ̯ |
| GOAT | `oU` | əʊ̯ | oʊ̯ |
| MOUTH | `aU` | aʊ̯ | aʊ̯ |
## Split Vowels
@@ -76,10 +82,15 @@ These are lexical sets defined by John Wells that are merged with other lexical
sets in both RP and GenAm, so have split from one of those lexical sets and
merged with the other.
| Lexical Set | RP | GenAm |
|-------------|-------|-------|
| BATH | ɑː | æ |
| CLOTH | ɒ | ɔ |
| Lexical Set | en | RP | GenAm |
|-------------|-------|-------|-------|
| BATH | `aa` | ɑː | æ |
| CLOTH | `0` | ɒ | ɔ |
__NOTE:__ eSpeak NG does not have a distinct transcription for the CLOTH lexical
set. As such, it can only represent American English accents with the COT-CAUGHT
merger where COT is the American PALM-LOT merger and CAUGHT is the American
THOUGHT-CLOTH merger.
## References