Translations:Frequency response of a digital system/12/es

${\begin{aligned}H(e^{-i\omega \Delta t})=H(\omega )=\sum \limits _{k=-\infty }^{\infty }{h_{k}e^{-i\omega \Delta tk}=A(\omega )e^{i\theta (\omega )}.}\end{aligned}}$

(72)