Chapter 9

Notes (15 August 2008)

P. 262: In Chapter 2, it was described how it was possible to calculate the efficiency of power transmission to the cochlea from the free field. As described in the text here (p. 262), the curve describing the energy coupled to the cochlea as a function of frequency approximates the shape of the behavioural audiogram in a number of species, with a dip in the same general frequency region, and the curves rising on either side (Rosowski, 1991). Note however that divergences between the threshold and constant power functions can be 10 dB in either direction, so there is up to a 20 dB error in the correspondence. Since the audiograms showing these relations commonly cover a range of only about 40 dB, this means that there is significant additional variation. (15 Aug 2008).

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