Download Audio synthesis by bitwise logical modulation The synthesis of rich audio spectra requires usually complex source waveforms, a large number of simple source components, or increased algorithmic complexity. This paper describes an implementation, which shows that simple elementary bitwise logical operations (OR, AND, XOR) possess power to produce such spectra. Applying these operations to two sinusoidal audio oscillators produced wide variety of new harmonically related sonic material. The synthesis method is efficient to implement and easily controllable, but it is not generally band-limited.
Download Dispersion modulation using allpass filters Dispersion is a physical phenomenon that makes sound waves more or less inharmonic. Most physical sound synthesis models consider dispersion as a constant property that does not change during the course of a musical event. However, these models would be more expressive without such a restriction. This paper describes a dispersion amount parameter for precise control over inharmonicity, and then experiments with control and audio rate modulation of that parameter. In this research we found that inharmonicity of a plucked string could be smoothly controlled in real-time, and that novel sonic material could be synthesized when the modulation rate was raised into audio range. Instability of the string model with certain parameter values was considered to be problematic.