Keywords: EllipticGain8a.png Detail of Image EllipticGain8 png which is an image of the log of the absolute value of the gain of an 8th order elliptic filter in complex frequency space s +j with 0 5 1 05 and <math>\omega_0 1</math> The white spots are poles and the black spots are zeroes There are a total of 16 poles and 8 double zeroes What appears to be a single pole and zero near the transition region is actually four poles and two double zeroes as shown in the expanded view below In this image black corresponds to a gain of 0 0001 or less and white corresponds to a gain of 10 or more Log of the absolute value of the gain of an 8th order elliptic filter in complex frequency space s +j with 0 5 1 05 and <math>\omega_0 1</math> The white spots are poles and the black spots are zeroes There are a total of 16 poles and 8 double zeroes What appears to be a single pole and zero near the transition region is actually four poles and two double zeroes as shown in the expanded view below In this image black corresponds to a gain of 0 0001 or less and white corresponds to a gain of 10 or more source code please Pole-zero plots |