Classification of Signals

Continuous vs discrete, periodic vs aperiodic, energy vs power, even vs odd signals.

Easy

Continuous-time $x(t)$ vs discrete-time $x[n]$ .
Analog (any amplitude) vs digital (quantised amplitude).
Periodic: $x(t) = x(t + T)$ ; fundamental frequency $f_0 = 1/T$ .
Even $x(-t) = x(t)$ and odd $x(-t) = -x(t)$ ; any signal is a sum of both.
Energy signals (finite energy, e.g. a pulse) vs power signals (finite average power, e.g. a sine wave).

Important standard signals: unit step $u(t)$ , unit impulse $\delta(t)$ , ramp, exponential and sinusoid.

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