PIEZOELECTRIC ELASTIC-WAVE CONVOLVER DEVICE

摘要

A convolver based on the propagation of acoustic waves at the surface of a piezoelectric solid comprises a piezoelectric substrate; two backwardtraveling acoustic waves are excited at the frequency f and at least two electrodes collect the signal at the frequency 2f, the signal being produced as a result of nonlinear interaction of the two acoustic waves. The convolver device is connected to one of the two electrodes by means of a plurality of electrical contacts placed lengthwise and at intervals along the axis of propagation of the two interacting acoustic waves which are representative of the electrical signals applied to the two convolver inputs.