Fidelity

Fidelity
The fidelity of a receiver is its ability to accurately reproduce, in
its output, the signal that appears at its input. You will usually find the broader the band passed by frequency selection circuits (due a lower Q in the inductor - or more
resistance in the tank circuit), the greater your fidelity.
You should remember that good selectivity requires that a receiver pass
a narrow frequency (or better Q/selectivity) band.
Good fidelity requires that the receiver pass a broader band to amplify
the outermost frequencies of the sidebands. Receivers you find in general use are a compromise between good selectivity and high fidelity.