feedbackn.
/ˈfiːdbak/, U.S. /ˈfidˌbæk/ 1. The return of a fraction of the output signal from one stage of a circuit, amplifier, etc., to the input of the same or a preceding stage (see also quot. 19232); positive feedback, negative feedback, tending to increase, decrease, the amplification, etc.; also, a signal so returned.
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the world > matter > physics > electromagnetic radiation > electronics > electronic phenomena > signal > [noun] > feedback
feedback1920
regeneration1920
superregeneration1922
1920 Wireless Age Nov. 27/1 An inductive feed-back in relation to the secondary system generates local oscillations.
1923 Daily Mail 19 May 4 The feed-back circuit.
1923 Harmsworth's Wireless Encycl. 913/1 The term feed back is applied to any radio-telegraph circuit in which one part of the circuit is coupled to another part in order to transfer some part of the energy in the one circuit to the other circuit.
1930 Morning Post 14 July 3 If the receiver is well designed, so that low-frequency feed-back is negligible, a filter circuit is not needed.
1946 Nature 9 Nov. 670/1 The signal to noise ratio was increased by the application of positive feed~back to the tuned circuit.
1949 Electronic Engin. 21 358/3 To obtain the maximum stabilising effect it is desirable to take the feedback from the output and apply it at the input in the correct phase for degeneration.
1962 Newnes Conc. Encycl. Electr. Engin. 289/1 The feedback principle is applied in electronic amplifiers, process controls and accurate servo-mechanisms.
2. transferred. The modification, adjustment, or control of a process or system (as a social situation or a biological mechanism) by a result or effect of the process, esp. by a difference between a desired and an actual result; information about the result of a process, experiment, etc.; a response.
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the mind > attention and judgement > answer > [noun] > information given in response
feedback1943
1943 Philos. Sci. 10 19 Purposeful active behavior may be subdivided into two classes: ‘feed-back’ (or ‘teleological’) and ‘non-feed-back’ (or ‘non-teleological’).
1945 Jrnl. Franklin Inst. 240 265 The shaft motion produced as the result of a sequence of operations is connected back into the sequence, a process called ‘feed~back’.
1955 Times 31 Aug. 9/4 Only by constant ‘feed~back’ from the receptor can one ascertain how far a message has been understood rightly.
1959 J. L. M. Trim in Quirk & Smith Teaching of English iii. 84 In..a lecture..the live speaker has a reaction, a ‘feed-back’ from the listeners, and..he can adjust his speech accordingly.
1962 Listener 30 Aug. 303/2 The feed-back from technology..has resulted in the production of more powerful and discriminating instruments.
1968 Times 6 Dec. 19/2 The production of both hormones seems to be regulated on a feedback mechanism by the level of calcium in the blood.
1970 Sci. Amer. Mar. 68/3 The brain has to receive feedback from the muscles and joints to correct the program of impulses directed to the motor apparatus.
1971 Frendz 5 Aug. 20/1 We began to get a fairly good feedback from most people who know about it and it looked as though the concerts would be good scenes.
Draft additions March 2004
The effect whereby sound from a loudspeaker reaches a microphone feeding the speaker, thereby distorting the sound, and typically generating a screeching or humming noise; this distorted sound, esp. (in Music) created as a deliberate effect, usually through the amplifier of an electric guitar.
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1936 Science 26 June 628/1 A button conveniently located on the side is used to turn the instrument [sc. a crystal microphone] on and off after it has been placed in the proper position, thus eliminating much of the problem of feed-back.
1968 Blues Unlimited Dec. 10 Muddy's new album Electric Mud is a morass of feedback,..reverb and every other trick.
1992 V. Capel Public Addr. Syst. i. 1 The great bugbear of all public address systems, feedback.
2002 I. Sansom Truth about Babies 16 The noise is incredible. The feedback, it's like Hendrix.
This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2022).
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n.1920