Abstract
An existing set of chinchilla noise exposure data has been re-analyzed using an advanced signal analysis tool and a statistical regression analysis. The data are comprised of 23 digitally recorded noise files and auditory damage indicators of the chinchillas measured at six frequency points, 0.5, 1, 2, 4, 8, and 16 kHz. From the relationship between the equivalent sound pressure level (Leq) of the six 1/3 octave frequency components of the noise and PTS of chinchillas, the Leq level that starts to cause auditory damage to chinchillas is identified as a function of frequency. These threshold levels of chinchillas, obtained for the first time in this study, will be useful information to design chinchilla exposure studies. The levels that will cause the same amount of PTS at the six frequencies are also obtained, from which equal auditory risk metric (EARM) curves are constructed. It is shown that a chinchilla version of an advanced noise guideline which enables quantitative, frequency-by-frequency assessment of the risk of a noise can be developed using the EARM curves. Possibility as well as difficulties of developing a human version guideline similar to this chinchilla prototype are discussed.
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