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How come freqz(SOS) doesn't work right when there is only one second-order section?

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Robert Bristow-Johnson
Robert Bristow-Johnson on 12 Jul 2018
So freqz() cannot tell the difference between a single second-order section and a 6-tap FIR filter.
Is there some way we can use freqz() with a SOS and not worry about the edge case of just one SOS?

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