� cool, so it appears from your comments to be real poles. �complex conjugate poles are not considered in the design. �i wonder why that is? r b-j ---------------------------- Original Message ---------------------------- Subject: Re: [music-dsp] � 45� Hilbert transformer using pair of IIR APFs From: "Laurent de Soras" <laurent.de.so...@free.fr> Date: Sun, February 5, 2017 3:03 am To: r...@audioimagination.com music-dsp@music.columbia.edu -------------------------------------------------------------------------- > robert bristow-johnson wrote: >> >> so Olli, how do you get your coefficients? (if i may ask?) > > If I may reply, I wrote long time ago a C++ library implementing > this kind of polyphase halfband filter, including a coefficient > calculator involving elliptic stuff (way beyond my knowledge). > Check the PolyphaseIir2Designer class: > <http://ldesoras.free.fr/prod.html#src_hiir> > > There is also an ARM/NEON implementation below, not published in > the main release yet: > <https://github.com/EleonoreMizo/pedalevite/tree/master/src/hiir> > > -- r b-j � � � � � � � � �r...@audioimagination.com "Imagination is more important than knowledge."
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