The Institute of Language in Education Scheme (Chinese: 教院式拼音方案) also known as the List of Cantonese Pronunciation of Commonly-used Chinese Characters romanization scheme (常用字廣州話讀音表), ILE scheme, and Cantonese Pinyin,[1] is a romanization system for Cantonese developed by Ping-Chiu Thomas Yu (Chinese: 余秉昭) in 1971,[2][3] and subsequently modified by the Education Department of Hong Kong (now the Education Bureau) and Zhan Bohui (詹伯慧) of the Chinese Dialects Research Centre of the Jinan University, Guangdong, PRC, and honorary professor of the School of Chinese, University of Hong Kong. It is the only romanization system accepted by Education and Manpower Bureau of Hong Kong and Hong Kong Examinations and Assessment Authority[citation needed].
The Institute of Education in its name refers to the Institute of Language in Education[4]: 487 (語文教育學院[4]: 423 ), which later became part of the Hong Kong Institute of Education, now the Education University of Hong Kong.
Pinyin
The ILE system directly corresponds to the S. L. Wong system, an IPA-based phonemic transcription system used in A Chinese Syllabary Pronounced According to the Dialect of Canton by Wong Shik Ling. Generally, if an IPA symbol is also a basic Latin letter, the same symbol is used directly in the romanization (with the exception of the IPA symbol "a"); and if the IPA symbol is not a basic Latin letter, it is romanized using basic Latin letters. Thus, /a/→aa, /ɐ/→a, /ɛ/→e, /ɔ/→o, /œ/→oe, /ŋ/→ng. This results in a system which is both easy to learn and type but is still useful for academics.
In the following table (based on Zhan's variant), the first row inside a cell shows the ILE, the second row shows a representative "narrow transcription" in IPA, while the third row shows the corresponding IPA "broad transcription" using the S. L. Wong system.
Initials
b [p] 〔b〕
p [pʰ] 〔p〕
m [m] 〔m〕
f [f] 〔f〕
d [t] 〔d〕
t [tʰ] 〔t〕
n [n] 〔n〕
l [l] 〔l〕
g [k] 〔ɡ〕
k [kʰ] 〔k〕
ng [ŋ] 〔ŋ〕
h [h] 〔h〕
gw [kʷ] 〔ɡw〕
kw [kʷʰ] 〔kw〕
w [w] 〔w〕
dz [ts] 〔dz〕
ts [tsʰ] 〔ts〕
s [s] 〔s〕
j [j] 〔j〕
Finals
aa [aː] 〔a〕
aai [aːi] 〔ai〕
aau [aːu] 〔au〕
aam [aːm] 〔am〕
aan [aːn] 〔an〕
aang [aːŋ] 〔aŋ〕
aap [aːp] 〔ap〕
aat [aːt] 〔at〕
aak [aːk] 〔ak〕
ai [ɐi] 〔ɐi〕
au [ɐu] 〔ɐu〕
am [ɐm] 〔ɐm〕
an [ɐn] 〔ɐn〕
ang [ɐŋ] 〔ɐŋ〕
ap [ɐp] 〔ɐp〕
at [ɐt] 〔ɐt〕
ak [ɐk] 〔ɐk〕
e [ɛː] 〔ɛ〕
ei [ei] 〔ei〕
eu [ɛːu] 〔ɛu〕
em [ɛːm] 〔ɛm〕
eng [ɛːŋ] 〔ɛŋ〕
ep [ɛːp] 〔ɛp〕
ek [ɛːk] 〔ɛk〕
i [iː] 〔i〕
iu [iːu] 〔iu〕
im [iːm] 〔im〕
in [iːn] 〔in〕
ing [eŋ] 〔iŋ〕
ip [iːp] 〔ip〕
it [iːt] 〔it〕
ik [ek] 〔ik〕
o [ɔː] 〔ɔ〕
oi [ɔːy] 〔ɔi〕
ou [ou] 〔ou〕
on [ɔːn] 〔ɔn〕
ong [ɔːŋ] 〔ɔŋ〕
ot [ɔːt] 〔ɔt〕
ok [ɔːk] 〔ɔk〕
u [uː] 〔u〕
ui [uːy] 〔ui〕
un [uːn] 〔un〕
ung [oŋ] 〔uŋ〕
ut [uːt] 〔ut〕
uk [ok] 〔uk〕
oe [œː] 〔œ〕
oey [ɵy] 〔œy〕
oen [ɵn] 〔œn〕
oeng [œːŋ] 〔œŋ〕
oet [ɵt] 〔œt〕
oek [œːk] 〔œk〕
y [yː] 〔y〕
yn [yːn] 〔yn〕
yt [yːt] 〔yt〕
m [m̩] 〔m̩〕
ng [ŋ̩] 〔ŋ̩〕
The finals m and ng can only be used as standalone nasal syllables.
The codas: i (except for being the coda[y] in Yale), u, m, n, ng, p, t, k.
But they have these differences:
The vowelsoe represent [ɵ] and [œː] in ILE while the eu represents both vowels in Yale.
The vowel y represents [y] in ILE while both yu (used in nucleus) and i (used in coda) are used in Yale.
The initialj represents [j] in ILE while y is used instead in Yale.
The initial dz represents [ts] in ILE while j is used instead in Yale.
The initial ts represents [tsʰ] in ILE while ch is used instead in Yale.
In ILE, if no consonant precedes the vowel y, then the initial j is appended before the vowel. In Yale, the corresponding initial y is never appended before yu under any circumstances.
Some new finals can be written in ILE that are not contained in Yale romanization schemes, such as: eu[ɛːu], em[ɛːm], and ep[ɛːp]. These three finals are used in colloquial Cantonese words, such as deu6 (掉), lem2 (舐), and gep9 (夾).
To represent tones, only tone numbers are used in ILE while Yale originally used tone marks together with the letter h (though tone numbers can be used in Yale as well).
Comparison with Jyutping
ILE and Jyutping represent Cantonese pronunciations with these same letters:
The initials: b, p, m, f, d, t, n, l, g, k, ng, h, s, gw, kw, j, w.
The codas: i (except for being the coda[y] in Jyutping), u, m, n, ng, p, t, k.
But they have these differences:
The vowelsoe represent [ɵ] and [œː] in ILE while eo and oe represent [ɵ] and [œː] respectively in Jyutping.
The vowel y represents [y] in ILE while both yu (used in nucleus) and i (used in coda) are used in Jyutping.
The initial dz represents [ts] in ILE while z is used instead in Jyutping.
The initial ts represents [tsʰ] in ILE while c is used instead in Jyutping.
To represent tones, numbers 1 to 9 are usually used in ILE, although to use 1, 3, 6 to replace 7, 8, 9 is acceptable. However, only numbers 1 to 6 are used in Jyutping.