Noisevember 2025

Noise made from the roots of all 15th degree Littlewood polynomials (i.e., polynomials with coefficients that are all ±1).  The sound's spectrogram matches, approximately,  a plot of the roots.

noise from roots of 15-th degree Littlewood polynomials

Noise made from the sequence of integers n such that the digits of n squared contain an equal number of 2's and 3's via the method described here: https://sites.math.washington.edu/~conroy/WXML/integerSequenceNoise/home.htm The photo shows the spectrogram of the first 90 seconds or so.

This upload was an mp3, so it probably isn't quite exact, but with a quick test listen it is subjectively equivalent.

noise from sequence of n such that the digits of n squared contain an equal number of 2's and 3's

A noisy track made from a bifurcation diagram.  The birfurcation diagram is for the function  f(x)=A(1-2|x-0.5|) if x<0.5 and f(x)=4Ax(1-x) if x>0.5. For this sound, A runs from 0.7 to 1 with time.  

bifurcation diagram sound

A few minutes of live-processed (with Csound) guitar improvisation.  The Csound code is a simple version of something I'm working on with delayed copies of the input signal interfering with each other spectrally.  

live processed guitar improvisation, I

More experimenting with live-processed sound using Csound.  I like ring modulation, and I am trying to find things that are like ring modulation, but are not ring modulation.  In this track, delayed copies of distorted guitar interfere with each other spectrally in a not-exactly ring modulation fashion.  It's not really ring modulationy enough, so I'll have to keep working on it.

live processed guitar improvisation, II

A math person making and modifying sounds with custom code, Csound, homemade electronics.

noise from roots of 15-th degree Littlewood polynomials

Matthew M. Conroy