Question

What is the frequency spectrum of a signal?

Answer 1

Signal's frequency spectrum :

1. A signal's frequency spectrum is the range of frequencies it contains.
2. A square wave, for example, is depicted in the given figure.
3. $S\left(t\right)=4A/\sin \left(2ft\right)+4A/3\sin \left(2\right(3f\left)t\right)+4A/5\sin \left(2\right(5f)t+...)$ can be represented by a succession of sine waves.

Therefore, the signal's frequency spectrum is shown above.