This one from the archives is pretty useful
https://lists.puredata.info/pipermail/pd-list/2005-10/031738.html
On Sep 27, 2022, at 2:50 PM, Roman Haefeli reduzent@gmail.com wrote:
On Mon, 2022-09-26 at 18:25 +0200, Jakob Laue wrote:
Actually I just need simple low-cutting
https://github.com/reduzent/netpd-instruments/blob/main/abs/fl_reshighpass_c...
from low to high frequencies and/or high-cutting from high to low
https://github.com/reduzent/netpd-instruments/blob/main/abs/fl_reslowpass_co...
Those two generate the coefficients that can be fed to [biquad~].
. A visual representation would be great.
The same coeffs that are fed to [biquad~] can be used to plot the frequency response (and phase response) with:
https://github.com/reduzent/netpd-instruments/blob/main/abs/fl_filterplot.pd
I don't deserve credit for them. They are based on abstractions created by Mike Moser-Booth.
Here is what the filterplot looks like:
https://www.netpd.org/fl-rhip.png
(screenshot of: https://github.com/reduzent/netpd-instruments/blob/main/abs/fl-rhip.pd )
Roman
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