This course is about signals and their processing by systems. It involves: Modelling of physical signals by mathematical functions, Modelling of physical systems by mathematical equations, Solutions of the equations when excited by the functions. The course provides the fundamental to all engineering. Steps involve in engineering are: Model system- Involve writing a mathematical description of input and output signals, Analyse system: Study of the various signals associated with the system, Design system: Requires deciding on a suitable system architecture, as well as finding suitable system parameters, Implement system/test system: Check system, and the input and output signal, to see that the performance is satisfactory.