利用声表面波器件中信号之间的参量相互作用可以获得两个调制射频信号的实时卷积,具有载波频率和传播常数分别为k_1和k_2的信号加在延迟线的两端。产生信号的频率为ω_1+ω_2,传播常数k_3=k_1-k_2,其在指对间隔l满足k_3l=2π关系的叉指换能器上输出。采用这种器件的不同结构,都得出输出信号是 Real-time convolution of two modulated RF signals can be obtained using parametric interactions between signals in SAW devices. Signals with carrier frequencies and propagation constants k_1 and k_2, respectively, are applied across the delay line. The frequency of the generated signal is ω_1 + ω_2. The propagation constant k_3 = k_1-k_2 is output on an interdigital transducer that satisfies the relationship of k_3l = 2π for the interval l. With the different structures of this device, the output signal is derived