Superb explanation. Renuka.
On 7/24/14, Siddalingeshwar Ingalagi <ingalagisi...@gmail.com> wrote: > hi sir, nice explaination. What is difference between ascii anci and > unicode UTF8 and UTF16? and what is font convert? > > On 7/23/14, Him Prasad Gautam <drishtibac...@gmail.com> wrote: >> Hi list, >> Many persons usually ask me what is unicode? >> Why screen reader work only in Unicode? >> Many VI fellows had requested me to make a system which may read >> non-uniCode letters which is not possible. >> They often complain that sited persons use non-uniCode system which >> they have to access. >> Here is a reply: >> >> Let you be clear: >> 1. computer only knows every thing in number, no letter, word, or >> order. For example, if you press enter key, computer understand it as >> 13. number of key. like your roll number in school. >> 2. It does not recognize anything except numbers. >> 3. Though Computer knows only the numbers; the number must be either >> zero or one. two, three , four is not understood by it. >> 4. The two, three, four, ten, hundred or billion etc is converted into >> a different number that contain zero and one which called binary. >> 6. The binary number which contains only zero and one is taken as >> follows: >> zero means(switch off (no electric supply). >> 1 meansswitch on ( electric supply.). >> 7. That means computer does switch on and off only, it does not do any >> thing more. >> 8. The processor speed expressed in hertz means how many times can it >> do the switch on and off in one second. >> 9. A human being takes few second to on or off a switch, computer does >> the same work many billions times in one second. >> Now, perhaps you may have understood: >> 1. Computer does not recognize any letters. >> 2. Instead a letter name like a, b, c, a number of that letter must be >> given to it. Like you are called by your roll number by a teacher, or >> an immigrant officer called you by your passport number or some one >> refered you by your id number but not by your name. >> 3. Hope you conclude that in computer letters are dealt in numbers >> only but not by their name. >> Now the first question begins: >> How the letters are given numbers? >> What number is given for English alphabet a or for b or for c or for >> z or for ka/kha of Hindi, or for alif/bay of urdu? >> The numbering system of all letter of all languages of the world is >> called unicode. >> For example: >> Government decided to allocate a id number to all of Indian citizen. >> Now the id number can be given in either way: >> First method: >> Bengal: 1, 2, 3, 4, 5 .... >> Orissa: 1, 2, 3, 4, 5, .... >> Gujarat:1, 2, 3, 4,5, >> Kerala: 1, 2, 3, 4, 5.... >> In this method, the id number within a state is not repeated but the >> same id number holder is found in another state. >> Second method: >> Do not repeat the id number in each state. Allocate an unique number >> for an Indian citizen. >> Now come to the letter numbering system: >> This is an example: >> English letter: 1, 2, 3, 4, 5, >> Russian letter: 1, 2, 3, 4, 5 >> Hindi letter: 1, 2, 3, 4, 5, .... >> Punjabi letter: 1, 2, 3, 4, 5, ... >> Chinese letter: 1, 2, 3, 4, 5 >> This method of giving the number is called ASCII system. >> Where the letter number is repeated. >> Second way: >> English lettter: 1, 2, 3, 4, 5, ... upto 99 >> Russian letter: 100, 101, 102, 103, 104...upto 199 >> Hindi letter: 200, 201, 202, 203, 204... up to 299 >> Punjabi letter: 300, 301, 302, 303, ... up to 399. >> Chinese letter: 400, 401, 402, 403, 404 >> In this method, the letter numbers is not repeated! in different >> language. >> This is the Unicode system of coding. >> Now the final reply: >> It is already cleared that computer recognizes a letter by its code >> number; if the Unicode system is followed, it recognizes the exact >> letter because there is no repeating of the letter code number. >> If the letters coded in ASCII encoding, the repeat of number takes >> places and computer does not recognizes which language or letter it >> belongs. >> Take an example: >> if you went to a school and asked the headmaster about the performance >> of your kid having roll number ten; Can the headmaster exactly judge >> which is the student? >> Definitely not, because there are many students having roll number ten. >> If the school have a roll number system as in unicode; he can >> immediately know who is the kid because in Unicode there will be only >> one student having roll number ten in the school. >> Same case happens to screen reader to recognize the exact letter. >> That is why It recognizes if in Unicode but does not if in ASCII code. >> >> Him Prasad Gautam >> Kathmandu, Nepal >> >> >> >> Register at the dedicated AccessIndia list for discussing accessibility >> of >> mobile phones / Tabs on: >> http://mail.accessindia.org.in/mailman/listinfo/mobile.accessindia_accessindia.org.in >> >> >> Search for old postings at: >> http://www.mail-archive.com/accessindia@accessindia.org.in/ >> >> To unsubscribe send a message to >> accessindia-requ...@accessindia.org.in >> with the subject unsubscribe. >> >> To change your subscription to digest mode or make any other changes, >> please >> visit the list home page at >> http://accessindia.org.in/mailman/listinfo/accessindia_accessindia.org.in >> >> >> Disclaimer: >> 1. Contents of the mails, factual, or otherwise, reflect the thinking of >> the >> person sending the mail and AI in no way relates itself to its veracity; >> >> 2. AI cannot be held liable for any commission/omission based on the >> mails >> sent through this mailing list.. >> > > > > Register at the dedicated AccessIndia list for discussing accessibility of > mobile phones / Tabs on: > http://mail.accessindia.org.in/mailman/listinfo/mobile.accessindia_accessindia.org.in > > > Search for old postings at: > http://www.mail-archive.com/accessindia@accessindia.org.in/ > > To unsubscribe send a message to > accessindia-requ...@accessindia.org.in > with the subject unsubscribe. > > To change your subscription to digest mode or make any other changes, please > visit the list home page at > http://accessindia.org.in/mailman/listinfo/accessindia_accessindia.org.in > > > Disclaimer: > 1. Contents of the mails, factual, or otherwise, reflect the thinking of the > person sending the mail and AI in no way relates itself to its veracity; > > 2. AI cannot be held liable for any commission/omission based on the mails > sent through this mailing list.. > Register at the dedicated AccessIndia list for discussing accessibility of mobile phones / Tabs on: http://mail.accessindia.org.in/mailman/listinfo/mobile.accessindia_accessindia.org.in Search for old postings at: http://www.mail-archive.com/accessindia@accessindia.org.in/ To unsubscribe send a message to accessindia-requ...@accessindia.org.in with the subject unsubscribe. To change your subscription to digest mode or make any other changes, please visit the list home page at http://accessindia.org.in/mailman/listinfo/accessindia_accessindia.org.in Disclaimer: 1. Contents of the mails, factual, or otherwise, reflect the thinking of the person sending the mail and AI in no way relates itself to its veracity; 2. AI cannot be held liable for any commission/omission based on the mails sent through this mailing list..
