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Waves

Electromagnetic Waves - Transmission - Analogue Signals.

Information in the form of speech or music
can be transmitted as an analogue or digital signal.

An analogue signal will resemble the original speech or music
by having the frequency or amplitude of the wave go up and down
in the same way as the sound in speech or music goes up and down.
The word analogue means "similar" or "corresponding".

Information in the form of an analogue signal can be added to
another electromagnetic wave which is used for transmission.
This wave carries the analogue signal and is called the carrier wave.

For much of the last century
information was transmitted in the form of analogue signals.
Today information is being increasingly transmitted using digital signals.
Digital signals have advantages over analogue signals.

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Copyright © 2007 Dr. Colin France. All Rights Reserved.