O.k. that helps a lot! Thanks.
I'll read on, for the math thing. If anybody has any suggestions, how to solve the problem, it would be great. I got curious about this stuff and am a litttle impatiant to know how it works ...
Am Mittwoch 10 März 2010 00:12:30 schrieben Sie:
Check the 'cyclone' lib, it has Max clones. I think there is at least one other reson~ included in Pd-extended.
.hc
On Mar 9, 2010, at 5:08 PM, Björn Lindig wrote:
Hi,
a friend asked me, wether there is a object similar to the [fffb~] in max/msp (a "fast fixed filter bank") in pd. I did not find it instantly so I started to build one after the formula posted in [reson~]s help in max:
y[n] = gain * (x[n] - r * x[n-2]) + c1 * y[n-1] + c2 * y[n-2]
I appended a patch, that I created after this formula. The Problem is, that I would love to klone the max-object, but at the moment I have only inlets for r, c1, c2 and gain. What I need is the math to calculate the values for r, c1, c2 and gain for given center frequency, Q/Bandwith, and gain.
I started reading the chapters on time shifts and delays and filters in miller-puckettes book and the book of J. O. Smith. But to be honest, I did not yet understand much of what is writen there. So I thought, there might be someone arround here, who can give me a fast answer, or who can point me into the right direction.
If it is the best to try resonz and resonr (I'm on train building pd- extended, used vanilla before), I'll accept that. On the other hand, I would be realy curious about the math that is used to solve this problem.
Thank you very much!
Bjoern
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