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y=poly([0 1],'s','coeff') //pole at origin
c=20+20*log10(5) //at w=5, y=20
k=10.^(c/20) //at w=1, y=c
wc1=5 //given
y1=poly([1 1/wc1],'s','coeff')
c1=20+40*log10(5) // second line is y=-40*log(w)+c1 . this is at w=5.
wc2= 10.^((-40-c1)/(-40))
y2=poly([1 1/wc2],'s','coeff')
TF= k*y2/(y*y1)
disp(TF,"transfer function = ")
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