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The "suborNo" Phonetic Transliteration scheme

The Phonetic Method used on supriyosen.net is called "suborNo". This Phonetic scheme was custom designed to be reflective of pronunciation and to be capable of two-way transliteration (so English to Bangla and Bangla to English both use the same character strings). This page describes how the transliteration tables were derived, and compares suborNo to the transliteration used by AVRO keyboard, a popular transliteration software.

Why Do You Need a Transliteration Scheme

Most people use English keyboards to interact with computers. The standard keyboard has an assigned key for each English letter of the Alphabet.

The sounds of letter of the Alphabet in Bangla are quite different from English. In many cases, more than one English letter may be required to correctly simulate the sound of a Bangla Alphabet. So how do you input Bangla letters into a computer with an English keyboard?

There are two approaches:

  1. Create a software "overlay" of the English Keyboard by assigning Bangla letters to different keys. For example, Apple ships a software keyboard with its Bangla fonts. The Key assignments are as follows.

    Normal

    With Shift pressed


    As you can see, the user now has to memorize the positions of all the Bangla Letters.

  2. Devise a Phonetic Transliteration table in which one or more English letters get transliterated to a single Bangla letter. The "transliteration" is done through software and is transparent to the user. The user types in English letters, and they show up in the equivalent Bangla form. For example, say you set up a scheme in which you defined
    • b='ব'
    • a='া'
    • ng='ং'
    • l='ল'
    If you typed in "bangla", the software would generate বাংলা.
    The user does not have to memorize a new keyboard layout. The sound of the Bangla letters, entered in English, generate the Bangla letters on the computer.
 

The Phonetic scheme described here is based on the second alternative.

Evolution

We have to start somewhere. The most commonly used textbook for learning Bangla is Teach Yourself Bengali by William Radice, so let us start with the phonetic scheme used in this book. On page 53, a summary of the phonetic scheme is provided. This is reproduced below.


Radice’s book was typeset, so many symbols are used that do not appear on a modern computer keyboard. We want to make it easy to type Bangla using a standard keyboard found in Personal Computers (Windows, Apple and Linux) as well as on today’s mobile devices like smartphones and tablets. 

Assigning English Phonetic Letters

You will notice that Radice used some letters not found standard English keyboards. These are marked as '??' below in the table below.

Vowels

 অ 
 ?? 
 আ 
 a 
 ই 
 i 
 ঈ 
 ?? 
 উ 
 u 
 ঊ 
 ?? 
 ঋ 
 ?? 
   এ 
 e 
 ঐ 
 ?? 
 ও 
 ?? 
 ঔ 
 ?? 

Consonants

 ক 
 k 
 খ 
 kh 
 গ 
 g 
 ঘ 
 gh 
 ঙ 
 ?? 
 চ 
 ?was c? 
 ছ 
 ?was ch? 
 জ 
 j 
 ঝ 
 jh 
 ঞ 
 ?? 
 ট 
 ?? 
 ঠ 
 ?? 
 ড 
 ?? 
 ঢ 
 ?? 
 ণ 
 ?? 
 ত 
 t 
 থ 
 th 
 দ 
 d 
 ধ 
 dh 
 ন 
 n 
 প 
 p 
 ফ 
 ph 
 ব 
 b 
 ভ 
 bh 
 ম 
 m 
 য 
 ?? 
 র 
 r 
 ল 
 l 
 শ 
 ?? 
 ষ 
 ?? 
 স 
 s 
 হ 
 h 
 য় 
 ?? 
 ড় 
 ?? 
 ঢ় 
 ?? 
 ৎ 
 ?? 
 ং 
 ?? 
 ঃ 
 ?? 
 ঁ 
 ?? 
 ্ 
 ?? 

Principles for Assigning Phonetic Representation

All assignments we have accepted from Radice's scheme are in lower case, and have 1 or 2 English letters representing the Bangla letters. The assignment logic is detailed below.

Assigning Phonetic representation

VowelSimilar sound toAssign
awe 'অ' sounds like a short o‘o’
owe 'ও' similar to ‘o’ capitalized ‘O’
long i 'ঈ' long ‘i’ soundcapitalized ‘I’
long u 'ঊ' long ‘u’ soundcapitalized ‘U’
dipthong oi 'ঐ'  oi sound, but would conflict with 'o'+'i' as in বই (boi) capitalized 'OI'
dipthong ou 'ঔ' ou sound, O already assigned to ‘ও'capitalized ‘OU’
rri ‘ঋ' rri sound‘rri’

Some authors have used 'ii', 'uu' and 'oo' to represent the long 'i', long 'u' and the vowel 'owe' respectively. I felt that words like দীর্ঘ (long), দূর (far) and দোলা (to swing) are better represented as 'dIrgho', 'dUr' and 'dOla' than 'diirgho', 'duur' and 'doola' when actually pronounced by an English speaker.

Consonant SignSimilar sound toAssign
khondo-taw 'ৎ'  sounds like a truncated taw as in হঠাৎ (suddenly) assign ‘t^’, with ^ showing abrupt ending
anuswar 'ং' ng sound, commonly used in spelling বাংলা‘ng’
bisorgo 'ঃ' abrupt h sound as in দুঃখ (sorrow)‘H^’
chondrobindu ' ঁ ' nasal n sound as in চাঁদ (moon)‘n^’
hosonto ' ্'  stops pronunciation of inherent vowel after a consonant.
In Unicode, hosonto is used to join two consonants eg 'ন' ্ 'ত'='ন্ত'
backtick '`'

ConsonantSimilar sound toAssign
ungaw 'ঙ' Used to spell বাঙালি (Bengali), has a ng sound‘Ng’
ingaw 'ঞ' ng sound, but ng and Ng already assigned‘NG’
chaw 'চ'  Assigned a 'c' by Radice. In most English words, c has a k sound as in cat.
c has a "chaw" sound in a few cases like the Italian word "Ciao",
and in the pronunciation of Radice which is pronounced as radichi.
This problem also exists in the AVRO phonetic scheme.
‘ch’
chhaw 'ছ' an aspirated ch, was assigned 'ch' by Radice'chh'
taw(hard) 'ট' hard taw sound, must be consistent with taw(soft), already assigned 't'‘T’
ttaw 'ঠ' aspirated version of previous letter, assihned 'T'‘Th’
daw(hard) 'ড' must be consistent with daw(soft), already assigned 'd'‘D’
dhaw(hard) 'ঢ' aspirated version of previos letter‘Dh’
moddenno-naw 'ণ' same sound as donte-naw, already assigned 'n'‘N’
ontesto-jaw 'য' same sound as borgiyo-jaw,already assigned 'j'‘J’
doye-sunno raw 'ড়' same sound as raw, already assigned r. Associated with daw 'D'‘R’
ddoye-sunno raw 'ঢ়' same sound as raw, already assigned r. Associated with dhaw 'Dh'‘Rh’
talibo-shaw 'শ'  same sound as donte-shaw, already assigned 's'.
This letter is associated with the word শান্তি (peace)
and is spelt in English translations as shanti.
Taking common usage into account
‘sh’
moddheno-shaw 'ষ'  similar sound to the donte-shaw, already assigned 's' and talibo-shaw,
already assigned 'sh'. Used in many Sanskrit derived words like
কৃষ্ণ (a Hindu God), and is usually translated as Krishna.
Since, 'sh' is already assigned, we use a capitalized S
‘Sh’
Additional, J in conjuncts  When used in consonant conjuncts, the sound of a trailing
'J' sounds like 'yaw', as in ব্যাথা (pain). 'y' is already assigned.
'J,Y'
Additional, baw in conjuncts  When used in consonant conjuncts, the sound of a trailing
'b' sounds like 'waw', as in God ইশ্বর (ishwor).
'b,w'

The resulting সুবর্ণ suborNo Transliteration scheme

The complete transliteration table looks like this.

Vowels & Vowel Diacritics

    
o
   
a
   ি
i
   
I
   
u
   
U
   
rri
    
e
   
OI
   
O
   
OU

Consonants and Consonant Signs


k

kh

g

gh

Ng

ch

chh

j

jh

NG

T

Th

D

Dh

N

t

th

d

dh

n

p

ph

b,w

bh

m

J,Y

r

l

sh

SH

s

h
য়
y
ড়
R
ঢ়
Rh

t^

ng

H^

n^

`

Using সুবর্ণ suborNo for Phonetic Transliteration

Each Bangla letter is represented by a sequence of 1 to 3 English letters, closely representing the phonetic sound of the Bangla letter. Note that upper and lower case English letters are used.

Example: To write আমার নাম সুপ্রিয়, you would enter amar nam supriyo.

Usage Notes

  1. Automatic selection of Vowels or Vowel Signs (-kar) based on context
    e.g. amar will be shown as আমার, with the correct form of the letter chosen
  2. Automatic generation of Juktakkhor
    e.g. pr produces প+র=প্র.
  3. Virtual Vowel "o"
    All Bangla Consonants end with the "awe" sound, as in "kawe" or "ko" for the Bangla consonant . The letter "o" can be thought of as a virtual letter, and can be used at the end of a word to make the phonetic word more aesthetic.
    e.g. to produce কর, you can write "kor" or "koro".
  4. Overriding Automatic Juktakkhor
    To prevent automatic juktakkhor, insert an o between the Consonants.
    e.g. pr would have produced the compound letter প্র. The letter o does not create a character but is used to break an automatic juktakkhor. If you want to write পর, you will want to break the automatic juktakkhor. So you would enter poro to get the desired result. This is also the correct phonetic representation of পর.
  5. Forced Hosonto
    The special sign Hosonto is sometimes necessary especially when writing foreign words. To put a Hosonto under a Bangla consonant put in a ` (reverse quote or grave accent) after the letter.
    e.g. Entering in`puT will show as ইন্পুট.

Differences from Avro Keyboard Phonetic scheme

Many Windows users are familiar with the Phonetic scheme used in the Avro Keyboard software from Omicron Labs. Here are the main differences you will see when you use suborNo.
Bangla LetterAvro KeyboardsuborNOComments
 'চ' cchPronunciation matched ch more closely than c
 'ছ'  ch chh Aspiration matches chh, takes into account assignment of ch above
 'য' zJ,YJaw is more correctly pronounced with letter j
 'শ' sh,Sshsecondary S dropped because there are 3 shaw sounds
 'ৎ' t``t^^ adopted for abrupt sound endings
 'ঃ'  : H^ Wanted to avoid punctuation signs in phonetic representation
 ' ঁ '  ^ n^ The nasal sound is better represented by including the n
 J-phola [cons]+J y,ZYConsistent with J as single letter
 reph [vow]+r+[cons]  [v]rr[c] Not Reqd Normal rules take care of reph
 hosonto '্' ',,'backtick '`'Avoid use of punctuation
 colon :  ':' Not Reqd Necessary because of assignment of : to bisorgo 'ঃ'

Software used with suborNo on the website

The transliteration schemes currently in use, are primarily employed at the point of writing, where the English Phonetic characters are transformed inline to Bangla. This is true of Google Transliterate and Avro Keyboard.

For a learner of Bangla, It is important to simultaneously see both the source English and the generated Bangla. This way, all errors can be corrected in the Phonetic English version and the correct way to render a Bangla word will be made more memorable. At the expense of some speed in entry, the website implements a 2 panel input area, with the user entering Phonetic English and the "system" rendering it into Bangla.

The core English-to-Bangla transliteration code is currently written in PHP. The user interface uses Javascript and AJAX. A number of software modules are used within the site.

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