# Communication Systems/Baseband and Broadband Signals

It is important to know the difference between a baseband signal, and a
broad band signal. In the Fourier Domain, a baseband signal is a signal
that occupies the frequency range from 0 Hz up to a certain cutoff. It
is called the baseband because it occupies the **base**, or the lowest
range of the spectrum.

In contrast, a broadband signal is a signal which does not occupy the
lowest range, but instead a higher range, 1 MHz to 3 MHz, for example. A
wire may have only one baseband signal, but it may hold any number of
broadband signals, because they can occur anywhere in the spectrum.

## Wideband vs Narrowband

in form of frequency modulation. wideband fm has been defined as that in
which the modulation index normally exceeds unity.

## Frequency Spectrum

A graphical representation of the various frequency components on a
given transmission medium is called a frequency spectrum.
