Explaination
- Anologue comes from the word analogous, meaning similar. Thus, an analogue signal varies in the same way as the information it represents.
An anologue signal can vary in its amplitude and/or frequency.
Frequency - is measured according to the number of times a wave form is repeated per second, expressed as Herz (Hz) or cycles per second. This is the number of times a wave will hit a peak per second.
Amplitude - determines the loudness, or volume for example the hieght of the peaks and troughs on our wave.
Signal distortion caused by line noise (interference) is one reason why computer data cannot be carried over analogue telephone circuits in the same way as the human voice.
Distortion could easily prevent communicating computers from reliably distinguishing between 1's and 0's, the patterns of which are crucial to accurate transmission of data. It is the job of a device called a modem to convert the computer's 1's and 0's to an analogue form resembling that of speech signals.
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