Why musical pitch depends on intensity, Γιατί το ύψος ενός τόνου εξαρτάται και απο την ένταση

Is it non linearity in the ear-brain mechanism when a higher amplitude sound wave enters creates harmonics including a 0 harmonic (DC component). Drift on the basilar membrane excitation point means change in pitch.


Reference:

Hearing: Its Psychology and Physiology - Stanley Smith Stevens and Hallowell Davies
Armstrong E.H. (December 12, 1914) "Operating Features of the Audion" Electrical World 64 (24): 1149-1152.