- The return of a fraction of the output of a circuit, device, piece of equipment, or system, to the input of the same circuit, device, piece of equipment, or system. Feedback may be intentional, as in a closed loop control system, or unintentional, as in howling. When the feedback is in phase with the original input signal, it is positive feedback. When the feedback is 180 degrees out-of-phase the original input signal, it is negative feedback.
- The mechanism employed to provide feedback (1).
- The use of feedback (1) in a control system. Also, the output returned to the input in such a system.
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