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In electronics, signal processing, and video, ringing is oscillation of a signal, particularly in the step response (the response to a sudden change in input). Often ringing is undesirable, but not always, as in the case of resonant inductive coupling. It is also known as hunting.[1] It is closely related to overshoot, often instigated as damping response following overshoot or undershoot, and thus the terms are at times conflated.

An illustration of overshoot, followed by ringing and settle time.

It is also known as ripple, particularly in electricity or in frequency domain response.

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