Abstract
In systems used to simulate wind instrument behavior the blowing pressure is often set to some constant value. This is equivalent to assuming that the blowing pressure source (lungs‐bronchi‐trachea‐vocal tract) has an internal impedance that is small in comparison with reed‐aperture plus tube impedance. A stylized pressure source plus reed‐aperture plus tube is simulated to investigate the effects of source characteristics and tube characteristics. The pressure source is represented by one of four configurations: large cross‐sectional area vocal tract, small cross‐sectional area vocal tract, an /a/‐shaped tract, and an /i/‐shaped tract. The rectangular “reed‐aperture” is parametrized so that its time variation is independent of any source or tube loading. Four “tube” loadings are simulated: a zero impedance, a resistance, an inertance, and a section of uniform tubing. Waveforms and spectra are calculated for air flow through the reed‐aperture, blowing pressure, and tube pressure for the 4 × 4 = 16 possible combinations to demonstrate the effects of source and tube characteristics.
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