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Essay text:
The voice was carried by modulating an electric current with a
waveform from a microphone. The receiving end would then vibrate a speaker coil
for the sound to travel back to the ear through the air. Most telephones today
still use this method. Computers, however, are digital machines. All information
stored on them is represented by a bit, representing a zero or a one. Multiple
bits are used to represent characters, which then can represent words, numbers,
programs, etc. The analog signals are just varying voltages sent across the
wires over time. Digital signals are represented and transmitted by pulses with
a limited number of discrete voltage levels...
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