DF2TFilter IIR filters?

[sairus7]

There is wrapper for FIR filters from DSP.jl.
What about IIR filters, like butter etc.?

[mchitre]

Currently SignalAnalysis.jl does not wrap any of the IIR filter functionality, but I'm open to suggestions on which ones are useful to have. Are you suggesting these 4? Anything else? Any suggestions on API?

[sairus7]

As an API example, I've made the following wrapper for my needs:

function butter(
    ftype::Type{<:FilterType},
    order::Int,
    fcut::Union{Number, NTuple{2,Number}},
    fs
)
    responsetype = ftype(fcut...; fs=fs)
    designmethod = Butterworth(order)
    return digitalfilter(responsetype, designmethod)
end

[mchitre]

Will add in when I get a chance to work on this.