Definition: | a unidirectional pulse defined as a function of time t by the expressions:
y = k sin2 (π t/2T) for 0 ≤ t ≤ 2T
y = 0 for t <0 and t > 2T
where:
y is the instantaneous value of the characteristic quantity,
k is the peak value of the pulse,
2T is the duration of the pulse, T being the length of time during which the characteristic quantity is greater than k/2
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