On Feb 7, 2011, at 2:39 PM, cyrille henry wrote:
Le 07/02/2011 18:40, Hans-Christoph Steiner a écrit :
On Feb 7, 2011, at 6:36 AM, cyrille henry wrote:
Le 07/02/2011 12:12, volker böhm a écrit :
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~.
or use bq~ from nusmuk-audio lib.
I like that [bq~] has audio inputs,
yep, that's very useful.
but can you send a list of them to the first inlet, like [biquad~]?
no, you need an unpack f f f f f...
i think to add this functionality should not be to hard, but do you
really need it?
Its what [biquad~] uses, so other objects expect that, like the filter
calcs in ggee. Plus this new filterview object I'm working on would
output a list, and using a list means making just a single connection
rather than 5.
.hc
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