If the input to a linear system is a sinusoidal wave, the output will also be
a sinusoidal wave, and at exactly the same frequency as the input.sinusoidal fidelity:
usoidal usoidal usoidal
If the input to a linear system is a sinusoidal wave, the output will also be
a sinusoidal wave, and at exactly the same frequency as the input.sinusoidal fidelity: