For the original signal to be represented accurately,
the Nyquist sampling criterion states that the samples must be taken at greater than twice the
rate of the fastest part of the measured signal.
This means that to sample the FM radio band
digitally would require sampling at a rate of 2 x
108.0MHz or 216MHz at a minimum. Sampling
rates four to five times the maximum signal
frequency are commonly used to better represent
the signal.