qdts algoritm as described in

Esteban Gutiérrez, Christopher Haworth, Rodrigo F. Cádiz; 'Generating Sonic Phantoms with Quadratic Difference Tone Spectrum Synthesis'. Computer Music Journal 2024;

doi: https://doi.org/10.1162/comj_a_00687

MIT press: https://direct.mit.edu/comj/article-abstract/doi/10.1162/comj_a_00687/124240/Generating-Sonic-Phantoms-with-Quadratic?redirectedFrom=fulltext