An introduction to the determination of the level of audibility performed with DWT

Normally, the level of audibility is investigated by means of the Evoked Potentials. In this work we illustrate the use of the Discrete Wavelet Transform for the exploration of observed signals. The results point to validate the decomposition of Evoked Potentials by wavelet analysis in order to allow to us a good identification of the level in auditory sensitivity of chinchillas. The aim of the work is to objective the determination of threshold of audibility of auditory Evoked Potentials response and their classification in terms of reliability based on the multiresolution analysis performed by wavelets. Usually, the Evoked Potentials are examined by two independent observers in order to define their features. In particular, the threshold value is obtained by calculating, for each ear, the average of the lowest intensity at which the response was revealed and the highest intensity at which the response disappeared. The use of wavelets for statistical purposes is still in its infancy, and it will be some years before their genuine practical advantages and disadvantages are understood properly. In particular the statistical ideas presented in this paper are clearly in need of further development but the results so far are extremely promising.