As this method is looking for the information in all
tunable FM stations, we must determine which
stations are tunable. This is accomplished by
taking a Fast Fourier Transform (FFT) of the
signal. This efficient algorithm of the Discrete
Fourier Transform (DFT) decomposes a time
domain sequence into its’ frequency domain
representation. The frequency spectrum is then
sent through a threshold detector that records the
frequency if the amplitude is above an
experimentally determined value. This will be
dependent on the noise level from the antenna, RF
amplifier and filters. This threshold level will also
determine the number of stations that will be
detected