PROCESS FOR COMPENSATING THE NON-UNIFORMITY OF A SURFACE WAVE CONVOLVER

摘要

- 10 - 89P8548 1. - Process for obtaining a compensation quantity to compensate the nonuniformity of a surface wave convolver 2.1 A surface wave convolver (C) consists of an elongate piezoelectric crystal, to the ends of which interdigital transducers are fitted to convert electrical input signals applied to signal inputs (E1, E2) into acoustic surface waves. At its integration electrode it is possible to pick off an output signal (c(t)) which corresponds to the convolution product of the electrical input signals. 2.2. In order to compensate errors caused by the nonuniformity of the surface wave convolver (C) in consequence of inhomogeneities of its integration electrode and of the piezoelectric crystal, a constant input signal (u(t)) is applied to one of the signal inputs (E1) and a predeterminable signal (v(t)), which determines a desired pulse response of the surface wave convolver (C), is applied to the other signal input (E2) of the surface wave convolver (C). The output signals (c(t)) are freed from stochastic disturbing components by averaging to form the compensation quantity (K(t)). The compensation quantity is fed to the output signal (c(t)) of the surface wave convolver (C) with the predeterminable signal (v(t)) in synchronism, when input signals (u(t)) to be processed are applied to the signal input (E1). 2.3. Signal measurement technology 3. FIG. 3