Focus Keyword: continuous-time and discrete-time signals

Continuous-time signals are defined for all values of time within a specified range, while discrete-time signals are defined at discrete points in time.

One key difference is that continuous-time signals can take on any value within the specified range, whereas discrete-time signals can only take on certain specific values at the sampling points.

Another difference is that continuous-time signals are represented by continuous functions, while discrete-time signals are represented by a sequence of values.

In terms of processing, continuous-time signals require analog processing techniques, while discrete-time signals can be processed using digital techniques.