Principle that deviation of a variable from a desired value results in actions to correct the change. Widespread use in body, e.g. baroreceptor reflex, mechanisms for control of hormonal secretion, body temperature, etc. Compare positive feedback.
An amplifier circuit configured so that the output signal is fed back to be compared with the input signal and any error signals cancelled. Easier to imagine than to achieve the desired results without unwanted side effects.
In all amplifiers, a part of the output signal that is fed back and added to the input signal out of phase, somewhat reducing the gain, limiting distortion, and imparting stability. Negative feedback, when used properly, can also improve frequency response. At higher frequencies, the feedback may not be fast enough, and the result will be increased transient intermodulation distortion. Under most conditions, this will not be audible. Feedback may be used "locally," in sections of an amplifier, or "generally," to control the response of the whole unit. See also TIM.
A sequence of interactions that damps or reduces the response to an initial perturbation. For example, consider a surface that is subjected to an increase in incoming radiation. This change in the energy balance produces an increase in temperature which, by virtue of the Stefanâ€“ Boltzmann law, results in an increase in the radiation emitted by the surface. Thus, the interaction by temperature and radiation acts to partially counteract the original perturbation. Compare positive feedback.
A process that results in a reduction in the response of a system to an external influence. For example, increased plant productivity in response to global warming would be a negative feedback on warming, because the additional growth would act as a sink for CO2, reducing the atmospheric CO2 concentration.
The practice of returning some of an amplifier's, or amplifier stage's, output to its input 180 degrees out of phase. This has a tendency to reduce distortion and make an amplifier more stable. Too much reliance on negative feedback results in very high IM (intermodulation distortion) readings, and poor sonic performance.
The return of a portion of the output signal to the input such that it is out pf phase with the input signal. A type of feedback in which the feedback signal is180° out of phase with the amplifier input signal.
Negative feedback (shortened to NFB) is a type of feedback in which the system responds in an opposite direction to the perturbation. It is a process of feeding back to the input a part of a system's output, so as to reverse the direction of change of the output. This tends to keep the output from changing, so it is stabilizing and attempts to maintain constant conditions.
Control mechanism present in the ecosystem and in all organisms, Information in the form of chemical, physical, and biological agents influences processes, causing them to shut down or reduce their activity.
a sensing mechanism detects a change in conditions beyond specific limits. A control center evaluates the change and activates the change and activates a second mechanism to correct the condition. The variant condition is canceled, or negated, so that conditions are returned to normal.