Chebyshev1FilterModel
Chebyshev1FilterModel[n] creates a lowpass Chebyshev type 1 filter of order n.
Chebyshev1FilterModel[{n,ωc}] uses the cutoff frequency ωc.
Chebyshev1FilterModel[{"type",spec}] creates a filter of a given "type" using the specified parameters spec.
Chebyshev1FilterModel[{"type",spec},var] expresses the model in terms of the variable var.
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