... 144 Analysis and Control of Linear Systems On the other hand, the Fourier transform preserves the energy (Parseval theorem).Indeed, the energy of a continuous-time signal y(t) or of a discrete-time ... proximity of ν0.142 Analysis and Control of Linear Systems A discrete-time deterministic signal y[k],k ∈Zis, by definition, a sequence of complex numbers:y =y[k]k∈ZIn short, we often speak of ... modern perspective”, Proceed-ings of the IEEE, vol. 69, no. 11, p. 1380–14 19, 198 1.[KWA 91 ] KWAKERNAAK H., SIVAN R., Modern Signals and Systems, Prentice-Hall, 199 1.[LAR 75]DE LARMINAT P.,...