Hi community.

Looking to implement a particular high-pass filter. See attachment for graphs.

6khz cut off, 1.5db slope. Low frequencies experience an almost 180 degrees phase-shift. The amount of phase shift decreases as the frequency is increased.

Any ideas?

http://www.pdpatchrepo.info/hurleur/Screen_shot_2013-08-13_at_12.20.07.png

Hi community,

Trying to create a waveshaper using a sigmoid transfer function. Have read miller puckette's book and looked at the examples, but can't seem to get to grips with how to get my sigmoid function to write to an array.

The function i'm looking to use as my waveshaper is:

F(f)=h+k tanh⁡(f)

Attached is a graphical version.

Any help would be great!

http://www.pdpatchrepo.info/hurleur/Screen_shot_2013-07-10_at_16.53.53.png

Hi community.

I have 3 filters that I need to design and need some help just implementing them in Pd. Two are boundary loss filters and one is a DC killer (implementation within a waveguide model).

Here's the details of the filters:

1. 0.376/1-.6^z-1 (low-pass)
2. 1.8417+ z^-1/1 (low-pass)
3. 1-z^1/ 1-.995z^1 (dc block)

Any help would be grateful, but any form of walk through to implement these filters in pd would be great. Attached is the image of the waveguide being created.

Cheers!

http://www.pdpatchrepo.info/hurleur/Screen_shot_2013-07-03_at_14.04.30.png

Hi community

Anyone had any success with waveguide modelling in puredata?

I'm developing a waveguide model for a Flute at the moment. Had moderate success but wondered if anyone had any patches to share? I've seen Kim Taylors work on here before but wondered if anyones had any other successful examples?

Hi community.

I'm trying to implement a sigmoid transfer function for my audio input. The function I need to use is:

F(f) = h + ktanh(f)

I've tried to implement it in pd (see attach) but not sure that what i've done is correct. I also wasn't sure if there were any sigmoid objects already out there in pd land.

Any thoughts?

http://www.pdpatchrepo.info/hurleur/sigmoid.pd

Hi community,

I'm having trouble compiling bensaylor's [partconv~] object.
(http://puredata.info/Members/bensaylor/partconv~-0.2.tar.gz/file_view)

I've gone into the directory, ran make and then pd_darwin but pd still doesn't seem to recognise the object.

I have also ran the FFTW mentioned in the description.

Can anyone talk me through what I should be doing/ am doing wrong?

Cheers

Has anyone come across successful methods for lagrange interpolation/thiran allpass filters on pd?

The delwrite argument initialises the buffer with a maximum delay value. In the example above, you've created a buffer length 1000ms, and the delread reads/taps/outputs from an index 500ms along the buffer.

Hope that makes sense? Read puckette's book on delay lines if you want any more meaty information.

Any thoughts?

I believe that is the one. Any ideas on how to implement something like that or the one outlined in the first post?

I'm modelling a pipe of radius 9.4. I already have a filter implemented already, which Maelstorm you may recall, but I wanted to know more about the phase change.