Friday, April 6, 2012

Morce Code

Information technology always develop, since the beginning of telecommunication technology that created use morce code to transfer some message to other people in a distance place. Morce code is a signaling code first devised by Samuel F.B. Morce in 1838 for use with his electromagnetic Telegraph. The code used two basic symbols or signaling elements: the "dot," a short duration electric current, which gave a quick deflection of the armature of Morse's receiver and so caused a dot to be printed on the strip of paper moving beneath the ink pen carried by the armature; and the "dash," a longer duration signal that caused a dash to be printed. Using this code, the various alphanumeric characters (letters and numerals) that compose a message could be represented by groups of these two signal elements. In the international Morse code, for example, one dot followed by one dash (٠- ) symbolized the letter A; the number seven appears as "dash dash dot dot dot" (- -٠٠٠). The dot and dash elements are separated by an interval that has the duration of one dot; the dash has a duration equal to three dots. The space between characters, whether letters or numbers, is equal to three dot units, whether letters or number, is equal to three dot units, the separation between words is six units. Morse's code rapidly gained acceptance and avoided into several forms. Early Morse - American Morse, and international Morse. Its international form it is still in use.

Although Morce devised his code for use with a printing telegraph, he and his collegue Alfred Vail soon realized that messages could easily be read from the sound of the clicking armature. When the printer was replaced by a simple buzzer, the operator could read the message from the sequence of dots and dashes.

Radio telegraph was introduced in 1897, and Morse code was again employed. In early use the radio signal would cause a sensitive relay to operate the local printer or buzzer circuit. Similarly, Morse code was applied to the left and right beats of the needle of the submarine telegraph and the llight flashes produced by a signaling lamp used on ships at sea. Morse's work dominated signal coding until well into the 20th century.

No comments: