

Author: Padgham C.
Publisher: S. Hirzel Verlag
ISSN: 1610-1928
Source: Acta Acustica united with Acustica, Vol.60, Iss.3, 1986-05, pp. : 189-204
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Abstract
A novel chart has been devised for the direct assessment of steady-state pipe organ timbre in two dimensions, namely tone (angle θ) and complexity C. This has received extensive trials. It enables a quantitative treatment of timbre to be undertaken, and has been shown to result in estimates of reasonable precision. The harmonic spectra of some 100 organ tones have been measured and the levels in decibels in third-octave bands have been tabulated. Two hypotheses have been verified, first that the type of tone (angle θ on the diagram) is a function of the strengths of the first five harmonics, which are separately resolved by the ear. Secondly, that the complexity C is a function of the strengths of the higher harmonics.
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