| 单词 | cut-off frequency |
| 释义 | > as lemmascut-off frequency g. A marked increase in the attenuation (or decrease in the amplification) of an oscillation when its frequency reaches some value, esp. of an alternating electric current or voltage by a filter, waveguide, etc.; usually attributive, as cut-off frequency, cut-off point. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > voltage > [noun] > increase in attenuation cut-off frequency1926 the world > matter > physics > electromagnetic radiation > electronics > electronic phenomena > [adjective] > of specific frequency > relating to cut-off cut-off1926 the world > matter > physics > electromagnetic radiation > electricity > electric current > alternating current > [noun] > amplitude > decrease in attenuation1887 cut-off frequency1926 the world > matter > physics > electromagnetic radiation > electronics > electronic phenomena > [noun] > frequency > specific frequencies > reaching specific value cut-off point1926 1926 B. Franklin & F. E. Terman Transmission Line Theory v. 141 This frequency is called the cut-off frequency of the high-pass filter, for it marks the transition from pass to attenuated frequencies. 1930 Bell Syst. Techn. Jrnl. 9 iii. 483 The cutoff points are taken as those at which the attenuation reaches a value 10 db greater than that at 1,000 cycles. 1930 Discovery Dec. 398/2 The directional filter offers very little attenuation to frequencies on one side of a certain frequency (cut-off frequency). 1959 Chambers's Encycl. XII. 735/1 The capacitative reactance of the air chamber in front of the diaphragm tends to raise the frequency at which this occurs, but results in a much sharper cut off at still higher frequencies. 1970 D. F. Shaw Introd. Electronics (ed. 2) xii. 272 The current gain of a transistor falls off at high frequencies... This frequency dependence is expressed accurately by the expression αf = α0/(1 + jf/fα) where..fα is called the alpha cut-off frequency. < as lemmas |
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