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Line 1: − #REDIRECT [[Audio feedback]]+ + + + + + + + +
Replacing the redirect to "Audio feedback" with something more useful.
When a signal is looped back into a system, the resulting effect is called '''feedback'''.
Feedback can be positive or negative, but these terms do not imply whether the feedback is wanted or not.
==Positive feedback==
In general, feedback is positive when the reaction of the system goes in the same direction as the initial signal. The most likely best-known example for this is [[audio feedback]]. An example of a non-technical feedback loop is the spreading of a rumor in the mass media: One person makes a plausible claim and other sources repost it, causing yet more sources to post it.
==Negative feedback==
When the system reacts to a signal by going into the opposite direction, there is a negative feedback. For example, a thermostat reacts to temperature changes by countering the observed trend: When the temperature sinks under the lower border, it increases the temperature; and when the temperature is above the upper border, it reduces the temperature.