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Ceefax

Ceefax. The name of the BBC's teletext service that sends data with regular transmission programs. With a teletext decoding tool, this data can be made to fill the screen or be displayed over the image page by page. When data from page 700 and up is formatted into certain microcomputers, they provide software for these machines. The software sent in this way is called telesoftware.

central processing unit (CPU)
unité f centrale de treatment

Central processing unit. The brain of the computer or its nervous center. It consists of three parts: its own store. An arithmetic logic unit and a control unit. The control unit executes each instruction of the program in turn, and this may include calculations performed on stationary data or on data moving between one part of the computer and another. The CPU is sometimes called the central processor.

character
charactère m

character. Any of the symbols on the touchpad. A character may be a number (...0.1.2), a letter (...A,B,C), a punctuation mark (...?,,!), a sign (. . ., -, +, *), or just a space.

character code
code m du character

character code. The binary code that computers use to represent characters. Each machine often has its own character code, although there are
standard codes such as ASCII.

character recognition
reconnaissance f de character

character recognition. Computers can understand dots and holes, but humans can read characters. To enter characters into a computer, one can use a touchpad to provide character codes, although it would be much faster if the computer could recognize written or printed characters. Optical character recognition (OCR) and magnetic ink character recognition (MICR) are the two main systems for automatic character recognition.

chart recorder
enregistreur m sur papier

graphic recorder. A record-keeping device that draws charts by moving a pen to the right or left while a piece of paper moves in one direction under the pen.

checksum digit
chiffre m du total de control

check sum digit. A method of verifying data entry It is important to verify the reasonableness of the data because errors are often made by the original data collector in the preparatory phase or the data is transmitted poorly. For this, the coded numbers can be added and then divided by a certain number called a modulus. The answer must not contain a remainder. If there is a remainder, this means that the coded number is incorrect due to an error

For example: to verify a number 462347
4+6+2+3+4+7=28 We add all the numbers

Divide by the modulus, let it be the odd number (7):
28 ÷ mod 7 = 0 (no remainder)
Thus, the coded number is correct. By using the checksum digit method, the probability of a wrong number passing through the check is greatly reduced.

See also weighted check degit.