The Lattice Gas Automata (LGA) models are based on a microscopic model of physical process being simulated and can be considered as an adjunct to the traditional numerical methods to the spatial dynamics simulation. Here we consider two simple LGA models: HPP and HPPRP. They are based on a square lattice whose nodes can be occupied by the moving particles in the HPP-model, and the moving and the rest particles in the HPPRP-model. In this paper, the possibility of a simple LGA models to simulate sound wave process in inhomogeneous medium formed from two solid materials (aluminium and ebonite) are investigated.

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