Previous work on matching musical instrument tones in wavetable synthesis used combinatorial selection to pick the basis spectra that best match target spectra from the original tone. An iterative method is proposed that divides the selection process over several levels. The results show that the iterative method is about as effective as the original method (within 3.5%) and more efficient.
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https://aes2.org/publications/elibrary-page/?id=11051
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