Before revision:  We derive, from first principles, a modal time-domain expansion for the scattered pressure field due to such a structure and propose that these modes should form the basis of a signal processing architecture. We investigate the properties of such an approach and show that higher-order gammatone filters appear by cascading. Further, we propose an approach for extracting meaningful global properties from the coefficients, tailored to the statistical properties of so-called natural sounds.
After revision:  We then turn our attention to developing a biomimetic signal processing algorithm. We use the response of the statistical properties of so-called natural sounds.