Eksempel allpass: H1(z)=−a+z−11−az−1\displaystyle H_1(z) = \frac{-a + z^{-1}}{1 - a z^{-1}}H1(z)=1−az−1−a+z−1
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Pol z=az=az=a, nullpunkt z=1/az=1/az=1/a. ∣H1(f)∣2=1|H_1(f)|^2 = 1∣H1(f)∣2=1 for alle fff.
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