Thanks, Marshall. This looks like a good start on what I'm trying to do. On Sat, Mar 28, 2020 at 6:49 PM Marshall Lochbaum <mwlochb...@gmail.com> wrote:
> Possibly more complicated than you're looking for, but I added some > comments to an old (and not very good) counterpoint melody generator and > pushed it here: > https://github.com/mlochbaum/JSound/blob/master/counterpoint.ijs > > The repository as a whole has tools for synthesis and mixing as well as > a function to write a .wav file. With these I can turn a melody into an > actual sound, and then a playable file: > > load '~user/Sound/synth.ijs ~user/Sound/counterpoint.ijs' > ]m =. 17 (melody-]) _7 NB. 7 notes, mixolydian mode centered > at 0 > 0 2 0 5 4 2 0 _3 _1 _3 2 0 _1 2 6 2 0 > l =. <.F * (%2) * 60%110 NB. Eight notes (two per beat) at 110 > BPM > s =. sine l # m trans note 'd' NB. Turn into a sine wave > s =. ((#m) rep 0.1^I l) * s NB. Exponential envelope > 'a.wav' writewav~ (-:max) * s NB. Write to file at half max volume > > The function play writes a file and immediately plays it. It requires > the aplay command which comes with Linux but I expect it would be easy > to write a version for another operating system. > > play (-:max) * s > > Marshall > > On Sat, Mar 28, 2020 at 05:27:46PM -0400, Devon McCormick wrote: > > Hi - > > has anyone done work with generating music or musical phrases in J? I'm > > helping someone develop a music training game that starts by generating > > sounds with a particular key, tempo, and phrase length. The idea is to > > help students to train their ears by testing them on their ability to > play > > back a randomly-generated musical phrase. > > > > I've told my collaborator that I think the generation part should be > > relatively straightforward but I am not schooled in music, so I'm not > sure > > how to start. > > I'm guessing that the second part of comparing the user's response to the > > generated phrase will be more difficult but I'd like to get any kind of > > start I can. > > > > Does anyone have any ideas about this? > > > > Thanks, > > > > Devon > > > > -- > > > > Devon McCormick, CFA > > > > Quantitative Consultant > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Devon McCormick, CFA Quantitative Consultant ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
