On 07.02.2011, at 00:12, Hans-Christoph Steiner wrote: > > I've started to write a GUI for generating biquad coefficients (something > like Max/MSP's [filtergraph~]). I've gotten the GUI interaction working > well, now I'm looking for the algorithms for generating a plot of the > frequency response of a given set of biquad coefficents? It'll end up being > Tcl, but I can easily read C, Csound, Java, Perl, Python, etc. > > .hc
i've been using the attached js file to query amplitude and phase response of biquad coeffs, where the coeffs are expected to be of the form: y[n] = a0 * x[n] + a1 * x[n-1] + a2 * x[n-2] - b1 * y[n-1] - b2 * y[n-2] (like in maxmsp). so, you'd have to rearrage the coeffs and turn the sign of the fb coeffs to make it work with the pd biquad~. vb
queryBiquad.js
Description: JavaScript source
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