Feedback (disambiguation)

Feedback can refer to:

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• Feedback in control theory and related disciplines.
• Audio feedback, which is the "howl" heard in microphone or guitar amplification systems.
• A type of message that a receiver transmits back to a source in response to having received a message.
• Feedback is the title of several rock & roll albums, the best known of which are the 1972 album by Spirit and the 2004 album by Rush.

Feedback occurs in a system when the output of the system influences the input to the system.

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In negative feedback, the feedback tends to reduce a change in the output, acting as a stabilising force and leading to stable outputs.

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In positive feedback, a small change in the output is increased by the feedback, leading to the output rapidly moving to its extreme positive or negative limit.

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Feedback occurs in many systems, including economics, biology, and electronic circuits.

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