Howtosignalprocessing
- What are frequency sidebands?
- What causes sideband frequencies?
- What produces the sidebands on FM?
- How many sidebands are present in an FM signal?
What are frequency sidebands?
In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, that are the result of the modulation process. The sidebands carry the information transmitted by the radio signal.
What causes sideband frequencies?
Sidebands are frequencies that are generated in the frequency domain because of the modulation of a Carrier signal by a Modulating signal.
What produces the sidebands on FM?
In FM, a set of sidebands is produced around the carrier C, equally spaced at a distance equal to the modulating frequency M. Therefore, we often refer to the sidebands in pairs: 1st, 2nd, 3rd, and so on. The so-called upper sidebands are those lying above the carrier.
How many sidebands are present in an FM signal?
Figure 7.9. Frequency modulation. Like AM, FM also produces sidebands. But unlike AM, which produces a single pair of sidebands for each frequency in the modulating signal, the FM process produces an infinite number of pairs of sidebands for each frequency in the information signal.
