SIGNALS Signals are functions of independent variables that carry information. For example Electrical signals --- voltages and currents in a circuit Acoustic signals ---audio or speech signals(analog or digital) Video signals ---intensity variations in an image(ega CAT scan) Biological signals ---sequence of bases in a gene2 SIGNALS Signals are functions of independent variables that carry information. For example: • Electrical signals --- voltages and currents in a circuit • Acoustic signals --- audio or speech signals (analog or digital) • Video signals --- intensity variations in an image (e.g. a CAT scan) • Biological signals --- sequence of bases in a gene • . • . •