The problem of pitch transposition in relation to the consistency of the timbre of a flute over its pitch range is investigated. The transposition method outlined here is based on the average variation of spectral distribution with pitch, and preserving the spectral behaviour in relation to the productive mechanism. A set of measures is proposed to measure the variation of the average spectral distribution with pitch, and a set of samples are analysed over the pitch range of the instrument. These measures are used in the transposition model to correct the average spectral distribution.
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