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The elliptic filter is effectively a combination of type I and type
II Cheyshev filters. We can trade both passband ripple and stopband
attenuation for a sharper rolloff. The elliptic filter has the sharpest
cutoff between passband and stopband of any of the standard analog
filter. In the example in 2, we've
choosen 2 dB ripple in the passband and 20 dB attenuation in the stopband.
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