Mar 27 2013 | 3:43 pm
    Not sure if I have missed an obvious resource to view Pure Data conversions into max
    Could anyone assist?
    I have a PD patch with "bp~" in it, what is this in max

    • Mar 27 2013 | 6:20 pm
      I don't know about obvious, but there are Stefan Tiedje's PD Abhaxions which you'll find on the old Share pages - http://www.cycling74.com/share.html
      My guess would be a bandpass filter?
    • Mar 27 2013 | 6:21 pm
      1. Look up the help file for the Pd object to see what it does [in this case, it's a bandpass filter]
      2. In Max, choose Help > Max Help. Type a word related to what you found out in #1 into the search box
      3. See what comes up. If there's more than one result, look at 'em all. You may meet a new object that way.
      4. If nothing comes up, try another phrase related to what you found in #1. Investigate *those* in the hope of meeting new objects.
      5. If nothing shows up that way, ask on the Forum.
      In your case, it would appear that reson~ or svf would be useful things to check out.
    • Apr 01 2013 | 6:03 pm
      thanks, really appreciate your help
    • Apr 01 2013 | 6:29 pm
      I have tried converting the 'bp~ 2519 69' into 'reson~ 2519 69' but I am not getting any output :/
      I will post the patch, don't suppose you can see the problem.
    • Apr 01 2013 | 7:42 pm
      reson~ needs 3 attributes (gain, frequency, and Q) to work.
      Here's your patch corrected.
    • Apr 01 2013 | 7:46 pm
      sombody already told you nicely to look at help files.
      Reson~wants as arguments:
      gain, center frequency, q
      while bp~ wants:
      center frequency, q
    • Apr 02 2013 | 12:48 pm
      bp~ is indeed a 2-pole bandpass filter, as is reson~, but that does not mean they are remotely similar. if you are porting general Pd patches and just need 'something similar', use reson~ or svf~ or filtercoef~ + biquad~.
      "[bp~] only implements feedback sections, not a feed-forward section as [reson~] does; the filtering (peak) is less extreme in [bp~]; it is a lot 'richer', especially when cascading"
      so, if you need an exact replica of the sound and response of bp~, i have only come across two max patches that do it (although i am sure there are many more). 1, by volker böhm, using biquad, and 2, by me, using gen~ (which is not technically bp~ as it uses signal rate update, but sounds exactly like it). i tend to use the volker böhm solution. you can find both patches towards the end of this thread:
    • Apr 02 2013 | 1:46 pm