The transliteration system referred to as Cœdès system is a reversible transliteration for Thai and Khmer, developed by Georges Cœdès and published in table form by his student Uraisi Varasarin.
This system is used in scholarly research.Ferlus, Michel. 1999. Sur l’ancienneté des écritures thai d’origine indo-khmère. Paper presented at the conference "Georges Coedès aujourd'hui" ("Georges Coedès Today"). Bangkok. https://halshs.archives-ouvertes.fr/halshs-00922719/ It tends to be favoured over the Royal Thai General System of Transcription—the official scheme promulgated by the Royal Thai Institute—because the latter is not reversible, as it underrepresents vowel quality and quantity.
G. Cœdès's transliteration system inherits some transliteration habits for scripts of Indian origin, such as the use of ṅ for the velar nasal, and the use of macron. It also reflects typographical convenience on a typewriter, such as the use of underlining.
Consonants Thai ก ข ฃ ค ฅ ฆ ง จ ฉ ช ซ ฌ ญ transliteration k kh k͟h g g̱ gh ṅ c ch j j̱ jh ñ Thai ฎ ฏ ฐ ฑ ฒ ณ ด ต ถ ท ธ น transliteration ṭ ṭ̱ ṭh ḍ ḍh ṇ t ṯ th d dh n Thai บ ป ผ ฝ พ ฟ ภ ม transliteration p p̱ ph p̱h b ḇ bh m Thai ย ร ฤ ล ฦ ว ศ ษ ส ห ฬ อ ฮ ฤๅ ฦๅ transliteration y r ṛ l ḷ v ś ṡ s h ḻ a ẖ ṝ ḹ
Vowels Thai -ะ-า อิอีอึอือุอูเ-เ-ะแ-ะแ- transliterationaā iīịị̄uūeeḥeeḥee
Thaiโ-ะโ-เ-อะเ-อเ-าะ-อเอือะเอือเอียะเอียอัวะอัว transliterationoḥoeaḥea, eiọhạị̄eaḥị̄eaị̄eyḥị̄eyvăḥvă, va
Thaiอำไ-ใ-เ-า transliterationāṃaia͟iau
Tones The Thai script was devised at a stage when the language contrasted three tones. This required two marks, one of the three tones being left unmarked. These were supplemented by two other tonal marks. G. Cœdès did not propose a standardized way to transliterate all four tone marks. For a transliteration system that aims at exhaustivity, it seemed useful to have a system that covers all five types of tones, including explicit marking for the absence of tone mark. The following proposal was put forward by Krisda Tan Sirijunto and Alexis Michaud in 2015. Thai เสียงสามัญ เสียงเอก เสียงโท เสียงตรี เสียงจัตวา description no tone mark Mai Ek (tone 1) Mai Tho (tone 2) Mai Tri Mai Cattawa transliteration ka⁰ ka¹ ka² ka³ ka⁴ Unicode symbol U+2070 SUPERSCRIPT ZERO U+00B9 SUPERSCRIPT ONE U+00B2 SUPERSCRIPT TWO U+00B3 SUPERSCRIPT THREE U+2074 SUPERSCRIPT FOUR
See also Romanization of Thai Romanization of Lao Royal Thai General System of Transcription
References