GCSE PHYSICS - What are Analogue Signals? - What is the Difference between Analogue and Digital Signals?

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Electromagnetic Waves - Transmission of Information.

What is the Difference between Analogue and Digital Signals?

Information in the form of images, speech or music can
be transmitted as an analogue or digital signal.
An analogue signal will vary continuously. There are
no gaps in an analogue signal. A digital signal has gaps in it.

What are Analogue Signals?

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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