IEM has a lot of abstractions that implement various filters, that
would be a good starting place. Or Guenter's objects to do the
calculations for [biquad~].

.hc

On Aug 12, 2005, at 4:10 AM, Chris McCormick wrote:

Hi!

I am a total filter-tech newbie, and I need a filter with the following specifications, preferably using [czero~] and [rpole~] and their pd-builtins ilk:

• Lowpass filter
• -18 dB per octave rolloff
• Does not self-oscillate
• Bipolar (cutoff can be modulated positively or negatively)
• Adjustable cutoff, and resonance

Any tips? Anyone love designing filters in PD so much that they want to do it for me? Perhaps somebody can point me at a document to help me
get started? I've already had a look at Miller's book, but before I spend so many nights revisiting long forgotten complex number mathematics I thought I'd check the list.

Best regards,

Chris.

---

chris@mccormick.cx http://mccormick.cx

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