The course introduces continuous-time (analogue) signals including an analysis and design of continuous-time systems. After reviewing core concepts in complex numbers, trigonometry, and functions, the course considers three alternate representations (differential equations, impulse response, and Laplace/Fourier transfer function) for linear, time invariant (LTI) systems in the continuous-time domain. The analysis of LTI systems is covered for each of the three representations. Frequency-selective filters are introduced as a special class of LTI systems for which design techniques are covered. Applications of continuous-time systems in communications and controls are also presented..