Wide Band Stop Butterworth Filter

Cuthbert Nyack
A wide band stop filter is derived by having a low pass filter in parallel with a high pass filter and summing the results. The low pass filter must have a lower 3dB frequency than the high pass filter.

In the above applet, the magnitude response is shown in red and pink. The phase delay is in green and the group delay in cyan.

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COPYRIGHT 2005 Cuthbert Nyack.