Codice Morse

Il codice Morse è un sistema di codifica che rappresenta lettere e numeri con sequenze di segnali brevi (punti) e lunghi (linee). Sviluppato da Samuel Morse e Alfred Vail negli anni 1830-1840, fu usato per la telegrafia e rimane in uso per comunicazioni di emergenza.

Ogni carattere è separato da uno spazio, ogni parola da tre spazi (qui rappresentati da /). Il punto (.) è il segnale breve, il trattino (-) il segnale lungo. Es: .... . .-.. .-.. --- = HELLO. In audio, il punto dura 1 unità, il trattino 3 unità.

In realtà SOS (... --- ...) fu scelto perché facile da trasmettere e riconoscere, non come acronimo. Solo successivamente fu retroattivamente associato a "Save Our Souls" o "Save Our Ship". Era lo standard internazionale di segnale di distress dal 1906 al 1999.

Each letter is a sequence of dots and dashes. A dash lasts three times a dot, the gap between signals is one dot, between letters three and between words seven. That timing is what makes it readable by ear.

Digits from 0 to 9 have their own five signal sequences, and the common punctuation marks have codes too. Characters with no Morse equivalent, such as accented letters, are left out of the conversion.

Because Morse was made to be heard, not read. Playing it back is the only way to check the rhythm, and it is how anyone learning the code actually learns it, rather than memorising dots on a page.

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