Signal Separation in the Frequency Domain

• If two signals do not overlap in the frequency domain, then they can easily be separated with band-pass filters.
• This is exactly what happens in broadcast radio and television.
• Example: An FM-radio station is often identified by a reference to a frequency, e.g., 99.1, 101.1, or 88.5.
• What this refers to is the center frequency of the signal that is transmitted by that radio station in Mega Hertz (MHz).
• The signal actually occupies a range of frequencies 200 Kilo Hertz (KHz) to the left and right of the center frequency.

  

Figure 2.3: Two signals that do not overlap in the frequency domain