A signal is a set of data or information, defined as a function of one or more variables, which conveys information on the nature of a physical phenomenon.
For example, a common form of human communication takes place through the use of speech signals.
Another example of human communication is visual in nature, with signals taking the form of images of people or objects around us.
Examples: Electrocardiogram (ECG) and electroencephalogram (EEG) waves that determine heart and brain conditions.
Example of signal
•Speech signals – speech recognition / communication
•Biomedical signals – brain, heart signals
•Audio signals – CD player, engine sound
•Video and image – medical image, digital camera, face recognition
•Radar signals – range and bearing of distance target
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