scipy.signal.butter: "Must specify a single critical frequency Wn" · Issue #10668 · scipy/scipy · GitHub
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BUG: signal.iirfilter of bandpass type is unstable when high corner exactly at Nyquist · Issue #6265 · scipy/scipy · GitHub
ValueError: Digital filter critical frequencies must be 0 < Wn < 1 · Issue # 1 · poganyg/IIR-filter · GitHub
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