Pd-list January 2002

pd-list@lists.iem.at

83 participants
162 discussions

biquad~ formula
by Nicolas Lhommet 03 Jan '02

03 Jan '02

Hello, biquad~ formula in the PD help-patch is : y(n) = ff1 * w(n) + ff2 * w(n-1) + ff3 * w(n-2) w(n) = x(n) + fb1 * w(n-1) + fb2 * w(n-2) biquad~ formula in Jmax is : y[n] = c1*x[n] + c2*x[n-1] + c3*x[n-2] - c4*y[n-1] - c5*y[n-2] What is the mathematical relation between these two formulae (so between Pd and Jmax coefficients) ? I found a nice document that explains how to get the right coeffs for different filters : http://www.harmony-central.com/Computer/Programming/Audio-EQ-Cookbook.txt and I'm not sure how to use it with PD biquad~ object. nicolas

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+~?
by Joseph Zitt 02 Jan '02

02 Jan '02

Yet another case where I may not be understanding something: I'm using the +~ object to mix audio streams in some of my patches. In most cases it does that, but there are a few points in which it seems to be modulating one stream with the other, rather than just mixing them. This is most pronounced when at higher volumes. I thought that I might be overloading my amplifier, but it acts the same if listened to through headphones. Is there a way to keep this from happening? -- |> ~The only thing that is not art is inattention~ --- Marcel Duchamp <| | jzitt(a)metatronpress.com http://www.metatronpress.com/jzitt | | Latest CDs: Collaborations/ All Souls http://www.mp3.com/josephzitt | | Comma: Voices of New Music Silence: the John Cage Discussion List |

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Pd-list January 2002