threshold frequency

threshold frequency

[′thresh‚hōld ‚frē·kwən·sē]
(electronics)
The frequency of incident radiant energy below which there is no photoemissive effect.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Immediately following the preliminary extraction, advanced extraction to obtain the effective wave component is conducted for subwaves with the specific threshold frequency using a few threshold coefficients; a relatively pure wave is finally achieved after wavelet packet reconstruction of the effective wave component.
During a transmission, if the number of nodes considering a node to be misbehaving is greater than or equal to Threshold Frequency [Th.sub.f] i.e., frequency >= [Th.sub.f], then the rating R of the corresponding node is set to [R.sub.Dubious] so that its misbehaviour can be detected as soon as communication begins.
First, we define the cutoff or threshold frequency [f.sub.th] as the starting frequency of the first transmission band, as indicated by the red arrow.
For each threshold criterion, fields were placed into one of two classes which were (i) less than or equal to the threshold frequency level or (ii) greater than the threshold frequency level.
In some ways, a photonic crystal behaves much like a metallic waveguide, restricting the propagation of electromagnetic waves below a threshold frequency. Forbidden wavelengths are determined by material layer thickness, dielectric constant, and feature periodicity.
Not that the chosen frequency of 1 Hz is significantly higher than the threshold frequency, [[omega]s.ub.threshold] = 0.003, 0.004 ad 0.006 Hz at T = 323, 328 and 333 K respectively.
And at a weekly level of 60 to 85 TRPs, the threshold frequency level Ephron in effect sets definitely ranges in the 3+ area, that is to say, very much in the neighborhood of the goal that would have been set by a planner pursuing the "old" effective frequency threshold philosophy.
The effect is demonstrated by the different frequencies at which a directional component is detected in the flicker (which we have called the rolling flicker threshold frequency, or RFTF); the RFTF is lower for top-to-bottom scanning.
Even a trait with a strong viability advantage would have to drift above a threshold frequency before it would be selected.
The threshold frequency for such effects is quite small, about 0.1 gauss per second.
ANOVA returned the main effect of audiometric threshold frequency confirming higher thresholds at 5 kHz than 500 Hz in each subject group (F(1, 51) = 66.23, P < 0.001).