---------------------------- Original Message ---------------------------- Subject: Re: [music-dsp] Changing Biquad filter coefficients on-the-fly, how to handle filter state? From: "Ethan Fenn" <et...@polyspectral.com> Date: Mon, March 28, 2016 11:43 am To: music-dsp@music.columbia.edu -------------------------------------------------------------------------- >> I suggest using ZDF (aka TPT, aka trapezoidal) state variable filter >> instead. > > > I don't know much about these yet -- but your book is on my list to read in > the near future! > using the trapezoid rule to model/approximate the integrator of an analog filter is no different than applying bilinear transform (without compensation for frequency warping) to the same integrator. � � �s^(-1) �<--- � T/2 * (1 + z^(-1)) / (1 - z^(-1)) -- r b-j � � � � � � � � �r...@audioimagination.com "Imagination is more important than knowledge." �
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