英语词汇“positive feedback”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

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.

ΘΚΠ

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.

positive feedback n. feedback which tends to cause an increase in the output signal, or (more widely) which tends to amplify the effect of which it is part; (in extended use) affirmative critical response; cf. negative feedback n. at negative adj., adv.², and int. Compounds.

ΚΠ

1934 H. S. Black in Bell Syst. Techn. Jrnl. 13 5 1/(1–μβ) will be used as a quantitative measure of the effect of feedback and the feedback referred to as positive feedback or negative feedback according as the absolute value of 1/(1–μβ) is greater or less than unity. Positive feedback increases the gain of the amplifier; negative feedback reduces it.

1962 J. H. Simpson & R. S. Richards Physical Princ. Junction Transistors ix. 210 In extreme cases this positive feedback may lead to a catastrophic increase in temperature—a phenomenon commonly called ‘thermal runaway’.

1973 Chicago Tribune 13 Jan. 12/1 The woman who stays home begins to depend on her husband and children for positive feedback about herself.

1994 Amer. Scientist Oct. 419/1 There is a positive feedback loop at work here. If a document makes use of devices that do not work on paper, then people will read it on the computer; if people read documents on the computer, then authors will be liberated to exploit devices that do not work on paper.

2004 Independent 30 Sept. (Educ. section) 5/2 The report gave positive feedback on music, ICT, equal opportunities and extra-curricular activities, but the main concerns were behaviour and attendance.

单词	positive feedback
释义	> as lemmas positive feedback 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. ΘΚΠ 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. extracted from feedbackn. positive feedback positive feedback n. feedback which tends to cause an increase in the output signal, or (more widely) which tends to amplify the effect of which it is part; (in extended use) affirmative critical response; cf. negative feedback n. at negative adj., adv.², and int. Compounds. ΚΠ 1934 H. S. Black in Bell Syst. Techn. Jrnl. 13 5 1/(1–μβ) will be used as a quantitative measure of the effect of feedback and the feedback referred to as positive feedback or negative feedback according as the absolute value of 1/(1–μβ) is greater or less than unity. Positive feedback increases the gain of the amplifier; negative feedback reduces it. 1962 J. H. Simpson & R. S. Richards Physical Princ. Junction Transistors ix. 210 In extreme cases this positive feedback may lead to a catastrophic increase in temperature—a phenomenon commonly called ‘thermal runaway’. 1973 Chicago Tribune 13 Jan. 12/1 The woman who stays home begins to depend on her husband and children for positive feedback about herself. 1994 Amer. Scientist Oct. 419/1 There is a positive feedback loop at work here. If a document makes use of devices that do not work on paper, then people will read it on the computer; if people read documents on the computer, then authors will be liberated to exploit devices that do not work on paper. 2004 Independent 30 Sept. (Educ. section) 5/2 The report gave positive feedback on music, ICT, equal opportunities and extra-curricular activities, but the main concerns were behaviour and attendance. extracted from positiveadj.n. < as lemmas
随便看	it is rejoiced it is right it is safe to say it is satisfied it is scathe it is scathe of him it is seldom that it is seldom the way with it is seldom when it is somebody else it is speedful it is storied it is the thought that counts it is to be wondered it is to good sense it is to sense it is to wit it is to witting it is too late it is too late to do something it is true it is true that it is very rare that it is very rarely that it is visible

> as lemmas