Week 3 - Non-Electronic Commmunication Devices

digital: electronics responding to discrete values of input voltage and producing discrete output voltage levels as in logic circuit

analogue: a description of a continuously variable signal or a circuit or device designed to handle such signals.

communication: exchange of information, thoughts, messages by speech, signals, symbols, writing or behaviour representation.

electronic: of, concerned with, using or operated by devices which electrons are conducted through a semi conducter, free space of gas


3 non-electronic digital devices:-

Typewriter

The typewriter was first introduced in 1870 and was an undispensable tool until the incorporation of the word processor. This device uses a set of keys, which when pressed transcribes the character onto the paper.

Smoke Signals

Smoke signals are one of the earliest forms of communication. They are basically a visual telegraph. Native Americans use smoke signals as a means of communication to portray messages while they are away from their families. The common communication message portrayed from smoke signals is that of distress and the need for help.

http://www.ehow.com/way_5681743_smoke-signals-method-communication.html

Morse Code

Morse code is the transmission of information using clicks, on-off tones and lights that is heard and understood by someone who specialises in understanding Morse Code. Each letter has an individual squence of dots and dashes. Before electronic communication, morse code was used by many ships to communicate with eachother their location.