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What (who) is baseband - definition
![Comparison of the equivalent baseband version of a signal and its AM-modulated (double-[[sideband]]) RF version, showing the typical doubling of the occupied bandwidth.](https://commons.wikimedia.org/wiki/Special:FilePath/Baseband to RF.svg?width=200 "Comparison of the equivalent baseband version of a signal and its AM-modulated (double-[[sideband]]) RF version, showing the typical doubling of the occupied bandwidth.")
Wikipedia
In telecommunications and signal processing, baseband is the range of frequencies occupied by a signal that has not been modulated to higher frequencies. Baseband signals typically originate from transducers, converting some other variable into an electrical signal. For example, the electronic output of a microphone is a baseband signal that is analogous to the applied voice audio. In conventional analog radio broadcasting, the baseband audio signal is used to modulate an RF carrier signal of a much higher frequency.
A baseband signal may have frequency components going all the way down to DC, or at least it will have a high ratio bandwidth. A modulated baseband signal is called a passband signal. This occupies a higher range of frequencies and has a lower ratio and fractional bandwidth.
