• chmod

    @weightless Hi again —

    I was trying to look at the envelope of the signal using env~ and subtracting this output with a delayed version of itself to find out where the envelope rises and falls. This seems to work pretty well for most of the instrument samples I was working with but I ran into a problem with a flute recording with a pretty heavy vibrato. Each "vibration" of the vibrato was detected as its own attack since thats where it would peak in the waveform as well.

    Your suggestion seems like it could work — I have all of my audio files in an Ableton project right now, is it alright if I send it to you that way (with all the samples in the project folder that is)?

    posted in technical issues read more
  • chmod

    @weightless

    I tried using that method today and found that if the notes are "tongued" and there is still a continuous pitch between every articulation, the -1500 does not appear as needed and the individual attacks are not picked up. This was especially apparent when I tested using my voice (saying "laaalaaalaaalaaa" for example)— there is a continuous pitch being picked up by sigmund~ but I am articulating the note four times.

    I've been trying to look at sudden jumps in the envelope instead but I need to find something that works "one size fits all" for different kinds of instruments and different volume levels as well, so it's been pretty tricky.

    posted in technical issues read more
  • chmod

    @weightless that's a great idea, I hadn't thought of that, the fact that sigmund outputs -1500 during silences in pitch mode.

    I knew I had to use a combination of object in some way, thanks a lot!

    posted in technical issues read more
  • chmod

    Hi everyone,

    I'm faced with a challenging problem involving rhythm detection for brass and wind instruments.

    If a saxophone (or similar instrument) plays four quarter notes continuously of the same pitch (let's say C), what do you think would be the best way to detect the start of each note— specifically if these notes are played smoothly with no clear separation between them?

    When the notes are clearly articulated (with a silence between them) I have been using sigmund~'s notes parameter to detect the attacks, but when the note is a continuous stream with a very subtle attack this does not work so well.

    I have also experimented with bonk~ but I can't seem to have any luck setting the parameters to ensure that it doesn't give "too much" output and detect attacks that aren't there or are coming from different sound sources.

    Any tips would be greatly appreciated, thanks!

    posted in technical issues read more
  • chmod

    Never mind, just a bit more searching and I found the proper way to do it from this part in the documentation:

    https://github.com/libpd/libpd/wiki/Adding-Pure-Data-external-libraries-to-your-project

    The big difference being that you have to forward declare the setup function a bit differently for c++, you have to do it like this:

    extern "C" {
        void helmholtz_tilde_setup();
    }
    

    posted in libpd / webpd read more
  • chmod

    @RonHerrema

    Hi there, did you ever end up getting this to work? I'm trying to integrate helmholtz~ into a libpd project as well, and I'm having trouble either building it as part of the libpd library (doesn't like .cpp files in the project), or including it in my Objective-C++ app.

    posted in libpd / webpd read more
  • chmod

    I just compiled helmholtz~ this evening. Really nice! Do you know if it does attack detection though?

    posted in technical issues read more
  • chmod

    Hey everyone~

    I'm working on a project right now that's essentially a rhythm-game (think Guitar Hero or Dance Dance Revolution) style app. It needs to listen to input from an instrument playing notes on a scrolling score of music.

    For the pitch tracking I only need to track monophonic voices, so this isn't a big issue and there are a lot of options— however I'm having a bit of trouble with the rhythm tracking of each note. I need to detect precise attack times for each note, at least at sixteenth note accuracy, hopefully better.

    So far I've been using sigmund~'s note mode to get the pitch and attack at around the same time, but there seems to be a bit of a delay at any combination of npts and hops sizes. I've also tried fiddle~ for the attack detection, with sigmund~ taking care of the pitches.

    Bonk~ seems to be interesting for responsive attack times, but there's the possibility of non-pitch noises being picked up as well that are not related to the instrument.

    I think it's just going to take a lot more experimentation on my end, but would anyone have any advice on a good strategy for accurately tracking the articulation and pitch of notes in real-time?

    posted in technical issues read more
  • chmod

    I like the weighted random idea —

    I think I'm going to start by implementing the bare-bones core structure of a piece, starting with the root note and mode, and then generating a chord structure based off of this mode. The idea of Schenkarian analysis is to start off by analyzing the larger chord structure of a piece (to find the overarching I-V-I motion) and then move inwards layer by layer in terms of complexity until the whole piece is analyzed down to the individual notes. I'm going to approach generation in the same way — when I get to the point where I am generating the smaller chord progressions I will probably use a weighted random scheme of commonly used motives.

    posted in technical issues read more
  • chmod

    Hi there—

    I've started research for an interesting project that requires real-time generation of simple music for infants and children. I'm reading up on different implementations of Schenkarian-style music generation — or rather Schenkarian analysis done in reverse to create original musical pieces. It seems that Pure Data would be an easy way to accomplish this goal — would anyone be able to give me some advice on where to begin, or point me to other Pure Data projects that deal with the same topic? I'd like to explore as many different examples as possible before making my own attempt.

    Thanks!

    -Chris

    posted in technical issues read more

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