Feedback

Feedback occurs when outputs of a system are routed back as inputs as part of a <a href="/facts/Signal_chain_(signal_processing_chain)/6C5aPXcL">chain</a> of <a href="/facts/Causality/Swh496X7">cause and effect</a> that forms a circuit or loop. The system can then be said to feed back into itself. The notion of cause-and-effect has to be handled carefully when applied to feedback systems:

<blockquote>Simple causal reasoning about a feedback system is difficult because the first system influences the second and second system influences the first, leading to a circular argument. This makes reasoning based upon cause and effect tricky, and it is necessary to analyze the system as a whole. As provided by Webster, feedback in business is the transmission of evaluative or corrective information about an action, event, or process to the original or controlling source.— Karl Johan Åström and Richard M.Murray, Feedback Systems: An Introduction for Scientists and Engineers</blockquote>

Feedback open-in-new

Feedback