Download Doppler Simulation and the Leslie
An efficient algorithm for simulating the Doppler effect using interpolating and de-interpolating delay lines is described. The Doppler simulator is used to simulate a rotating horn to achieve the Leslie effect. Measurements of a horn from a real Leslie are used to calibrate angle-dependent digital filters which simulate the changing, angle-dependent, frequency response of the rotating horn.
Download Modeling Bowl Resonators Using Circular Waveguide Networks
We propose efficient implementations of a glass harmonica and a Tibetan bowl using circular digital waveguide networks. Circular networks provide a physically meaningful representation of bowl resonators. Just like the real instruments, both models can be either struck or rubbed using a hard mallet, a violin bow, or a wet finger.
Download The Sounds of the Avian Syrinx - are they Really Flute-Like?
This research presents a model of the avian vocal tract, implemented using classical waveguide synthesis and numerical methods. The vocal organ of the songbird, the syrinx, has a unique topography of acoustic tubes (a trachea with a bifurcation at its base) making it a rather unique subject for waveguide synthesis. In the upper region of the two bifid bronchi lies a nonlinear vibrating membrane – the primary resonator in sound production. Unlike most reed musical instruments, the more significant displacement of the membrane is perpendicular to the directions of airflow, due to the Bernoulli effect. The model of the membrane displacement, and the resulting pressure through the constriction created by the membrane motion, is therefore derived beginning with the Bernoulli equation.