Download Estimating the amplitude of the cubic difference tone using a third order adaptive Volterra Filter Design method of a nonlinear filter to estimate the amplitudes of cubic difference tones is presented. To this end, a third-order Volterra filter is used to model the nonlinearity of our auditory system, and the filter coefficients are obtained using an adaptive process. The results show the filtered outputs follow very closely the experimental data as the intensity levels and the frequencies of inputs vary especially when the frequency separation between the two primary tones is not large.