k( t ) = Im( FUMUNOKAGOMEKO( t ) ) k(t) = Im( FUMUNOKAGOMEKO(t) )
f = t1 t2 kt e -2 π j x f dt k'(f) = ∫ [t1,t2] k(t) × pow(e, -2πjxf) × dt
max f = x max k'(f) = k'(x)
t - czas; f - częstotliwość; t1 < t2