PLEASE HELP I CAN"T CONVOLVE :(


    Apr 03 2012 | 10:21 am
    Hi,
    I am a beginner!! I've been having problems understanding how to convolve in max msp. I have been using the pfft~ object. Do you just input the IR signal? or input the IR and an input signal into the left inlet of the pfft~ object? If not where do these signals go?
    I have a lot more questions but I think this needs to be asked first.
    many thanks

    • Apr 03 2012 | 2:29 pm
      THIS type of convolution wont really work with pfft, because it is too short. mirroring an impulse response required to do each sample of A with each sample of B.
      there is a third party deconvolution object, you might use this. (building a mirrored file is the same process than using it later as filter or reverb.)
      -110
      p.s. i think its called tconvolve~
    • Apr 03 2012 | 5:10 pm
      thank you Roman Thilenius.
      Would I use fft~ and ifft~ objects to make the IR as a reverb plug-in?
      Maybe this would be easier than trying to include the input signal at the beginning
    • Apr 04 2012 | 4:39 pm
      i am not sure how to write your own using ifft or pfft object, but i thin i can foresee that it will eat up too much CPU anyway.
      what will work as an example is to implement it using buffir~.
      but of course that has a certain sample limit as well, and wont do much more than a cheap sounding 2-band EQ or one first reflection for a verb. :)
      is there a reason why you want to do your own code in MSP? i think its easier to use soundhack, peak, or matlab.
      the download for those HISS tools is still dead ... anyone?
      -110
    • Apr 04 2012 | 10:28 pm
      alex harker has made an impulse convolver as part of his suite of objects announced in this thread
      i think in the help files there's a reverb via convolution example
    • Apr 06 2012 | 11:17 am
      Hi, thanks for your help!!
      I have decided to use the fft~ and ifft~ objects. Which seems to be working okay. However the output signal produced is slightly distorted and quiet... any tips for getting rid of them?