Which term describes the ability to accurately reproduce an input signal at the output?

The term that describes the ability to accurately reproduce an input signal at the output is fidelity. In the context of information systems and signal processing, fidelity refers to how faithfully a system can replicate the input signal without introducing distortions or alterations. High fidelity implies that the output closely matches the original signal, preserving its quality and characteristics. This is crucial in many applications, including audio and video systems, where maintaining the integrity of the original signal is essential for accurate representation and user satisfaction.

Noise refers to any unwanted signals that interfere with the desired signal, adversely affecting reproduction quality. Selectivity involves the ability of a system to respond to a specific range of frequencies while ignoring others. Frequency response describes how a system reacts to different frequencies of input signals but does not directly address the quality of the output signal in terms of fidelity. Thus, fidelity stands out as the key term that specifically defines the accurate reproduction of an input signal at the output.