sensing threshold


Also found in: Dictionary, Thesaurus, Financial, Encyclopedia.

threshold

 [thresh´old]
1. the level that must be reached for an effect to be produced, as the degree of intensity of stimulus that just produces a sensation.
2. that value at which a stimulus just produces a sensation, is just appreciable, or comes just within the limits of perception.
auditory threshold the slightest perceptible sound.
threshold of consciousness the lowest limit of sensibility; the point of consciousness at which a stimulus is barely perceived.
defibrillation threshold DFT; the minimum amount of energy in joules that will consistently terminate ventricular fibrillation.
fibrillation threshold the least intensity of an electrical impulse that will cause cardiac tissue to begin fibrillation.
pacing threshold the minimal electrical stimulus required to produce consistent cardiac depolarization.
renal threshold that concentration of a substance (threshold substance) in plasma at which it begins to be excreted in the urine.
sensing threshold in cardiac pacing terminology, the voltage of the minimum signal that consistently activates pulse generator function.

sensing threshold

Cardiac pacing The minimum atrial or ventricular intracardiac signal amplitude in mV required to inhibit or trigger a demand pacemaker
References in periodicals archive ?
(1) [p.sub.busy]-carrier sensing range scales 1/[k.sup.1/[alpha]] time when the carrier sensing threshold scales k time.
(3) [p.sub.busy]-carrier sensing range is invariant when both the transmission power and carrier sensing threshold scale the same time.
7 and 8 show the average throughput and the collision probability versus the normalized sensing duration for different detectors when the sensing threshold [gamma] > [[sigma].sup.2.sub.w] + [[sigma].sup.2.sub.p].
Numerical examples show that the optimal sensing duration can be derived only for an appropriate sensing threshold. Compared with energy detector, there is no optimal sensing duration for the EME detector due to its poor sensing performance.
A more accurate ML classification approach [4] suggests selection of a sensing threshold [[lambda].sub.SEF] that results in achieving sensing error floor under the assumption that [P.sub.fa] = [P.sub.md].
The sensing threshold [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] can also be deduced in terms of parameters of likelihood distributions p(D|[h.sub.i]) by considering that [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII].
ROCs are very useful not only in understanding the performance of a sensing technique but also to decide a suitable sensing threshold.
Since [P.sub.d]([lambda]) is monotonically decreasing function of [lambda], if [[lambda].sup.'] [less than or equal to] [bar.[lambda]], [[lambda].sup.'] is the optimal sensing threshold ([[lambda].sup.*]) minimizing spectrum sensing error while satisfying spectrum sensing requirement sufficiently (i.e., [[lambda].sup.*] = [[lambda].sup.'] if [[lambda].sup.'] [less than or equal to] [bar.[lambda]]).