Random electrical noise occurs in any practical information transmission system. Although its general characteristics such as mean square value and power spectrum may be known, its essential characteristic is that its value at any instant (amplitude or frequency) is unpredictable. Electrical noise can, of course, be considered to be a signal, and is capable of carrying information; in fact it will be shown later that noise-like waveforms have the greatest information capacity. However, in practical systems electrical noise is an unwanted signal, producing errors or changes in amplitude of the wanted signal, and reducing the overall information transfer.
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- Electrical Noise
M. J. Usher
- Macmillan Education UK