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In electronics, signal processing, and video, ringing is unwanted oscillation of a signal, particularly in the step response (the response to a sudden change in input). It is also known as hunting. It is closely related to overshoot, generally occurring following overshoot, and thus the terms are at times conflated. It is also known as ripple, particularly in electricity or in frequency domain response. ==Electricity== In electrical circuits, ringing is an unwanted oscillation of a voltage or current. It happens when an electrical pulse causes the parasitic capacitances and inductances in the circuit (i.e. those that are not part of the design, but just by-products of the materials used to construct the circuit) to resonate at their characteristic frequency.〔Johnson, H. and Graham, M. ''High-Speed Digital Design: A Handbook of Black Magic''. 1993. pp. 88–90〕 Ringing artifacts are also present in square waves; see Gibbs phenomenon. Ringing is undesirable because it causes extra current to flow, thereby wasting energy and causing extra heating of the components; it can cause unwanted electromagnetic radiation to be emitted; it can delay arrival at a desired final state (increase settling time); and it may cause unwanted triggering of bistable elements in digital circuits. Ringy communications circuits may suffer falsing. Ringing can be due to signal reflection, in which case it may be minimized by impedance matching. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ringing (signal)」の詳細全文を読む スポンサード リンク
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