Pitch translation of trumpet tones

In an attempt to design trumpet timbres for digital music synthesis, notes of a trumpet were digitally recorded. Spectral analysis at high resolution showed both a harmonic line spectrum and a weak continuous spectrum. The continuous spectrum did not appear to contribute to the tone. Shifting the pitch by sample rate conversion (interpolation or decimation) caused serious changes in tone unless the spectral envelope was deconvolved from the signal before pitch shifting and reconvolved with the shifted signal. This procedure can be used to simulate the spectral envelope of a trumpet, which remains roughly constant as the pitch is changed.