the furnishing of data concerning the operation or output of a machine to an automatic control device or to the machine itself, so that subsequent or ongoing operations of the machine can be altered or corrected.
a reaction or response to a particular process or activity:
He got very little feedback from his speech.
evaluative information derived from such a reaction or response:
to study the feedback from an audience survey.
Psychology. knowledge of the results of any behavior, considered as influencing or modifying further performance.
Biology. a self-regulatory biological system, as in the synthesis of some hormones, in which the output or response affects the input, either positively or negatively.
the return of part of the sound output by a loudspeaker to the microphone or pick-up so that a high-pitched whistle is produced
the whistling noise so produced
information in response to an inquiry, experiment, etc: there was little feedback from our questionnaire
(transitive) to return (part of the output of a system) to its input
to offer or suggest (information, ideas, etc) in reaction to an inquiry, experiment, etc
1920, in the electronics sense, from feed + back (adj.). Transferred use, “information about the results of a process” is attested by 1955.
feedback feed·back (fēd’bāk’)
The supply of an input to some process or system as a function of its output. See more at negative feedback, positive feedback.
A process in which a system regulates itself by monitoring its own output. That is, it “feeds back” part of its output to itself. Feedback is used to control machines; a heating system, for example, uses a thermostat to monitor and adjust its output. Feedback is also used by the human brain to control various muscles and joints.
Note: By extension, “feedback” is any response or information about the result of a process.
Note: Feedback is usually a feature of automation.
To surprise and create discomposure: those grades don’t faze her (1830+)
Part of a system output presented at its input. Feedback may be unintended. When used as a design feature, the output is usually transformed by passive components which attenuate it in some manner; the result is then presented at the system input.
Feedback is positive or negative, depending on the sign with which a positive change in the original input reappears after transformation. Negative feedback was invented by Black to stabilise vacuum tube amplifiers. The behaviour becomes largely a function of the feedback transformation and only minimally a function of factors such as transistor gain which are imperfectly known.
Positive feedback can lead to instability; it finds wide application in the construction of oscillators.
Feedback can be used to control a system, as in feedback control.
- Feedback control
electronics A control system which monitors its effect on the system it is controlling and modifies its output accordingly. For example, a thermostat has two inputs: the desired temperature and the current temperature (the latter is the feedback). The output of the thermostat changes so as to try to equalise the two inputs. Computer disk […]
- Feedback inhibition
feedback inhibition n. An inhibition of activity due to the production of an end product of the action. Also called feedback mechanism.
noun 1. Also called nose bag. a bag for feeding horses, placed before the mouth and fastened around the head with straps. Idioms 2. put on the feed bag, Slang. to have a meal; eat: When his friends put on the feed bag, they finish everything in sight. /ˈfiːdˌbæɡ/ noun 1. any bag in which […]
noun 1. Also called nose bag. a bag for feeding horses, placed before the mouth and fastened around the head with straps. Idioms 2. put on the feed bag, Slang. to have a meal; eat: When his friends put on the feed bag, they finish everything in sight.