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dB(x)=20*log(abs(x))/log(10) # logarithmische Filterdarstellung in dB (s/20/10/ for abs(x)^2)
s2z(s)=(1+s)/(1-s) # s-Ebene -> z-Ebene (bilinear Trans.)
j={0,1} # sqrt(-1)
Z(x)=exp({0,-1}*x) # gnuplot laufvariable x fuer H(z)
set samples 4000 # more accuracy
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