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Spectral Transformation of Discrete Time Signal<br />

Insertion of sampled signal in Fourier formula:<br />

X(!) =<br />

+1 Z<br />

X<br />

¡1<br />

= X<br />

Normalization of frequency to sampling frequency:<br />

Stephan Henzler Mixed-Signal-Electronics 2012/13<br />

n<br />

n<br />

x(nT )<br />

x(nT )±(t ¡ nT )e ¡j!t dt<br />

+1<br />

Z<br />

¡1<br />

= X<br />

x(nT )e ¡j!nT<br />

n<br />

e ¡j!t ±(t ¡ nT )dt<br />

X(­) = X<br />

x[n]e ¡j­n X(z) = X<br />

x[n]z ¡n<br />

n<br />

FT of discrete sequence<br />

generalization<br />

z = e j­ = e j!T<br />

FT of sampled signal<br />

­ = !T = 2¼f<br />

n<br />

z-Transformation<br />

fs<br />

18

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