Broadband acoustic logic gates in a circular waveguide with multiple ports

Abstract

We report both experimentally and numerically that a broadband acoustic logic gate is realized by multi-port circular waveguides immersed in air. The logic functions OR, NOT, AND, XOR, and XNOR are realized by the three-port and four-port circular waveguides with a uniform threshold in the range of 3640 Hz–8920 Hz, which arises from the linear interference mechanism by adjusting the phase difference and propagation path between two input signals. Besides, the complex logic NOR and NAND functions are obtained by the cascading of two basic logic gates, and interesting applications of the logic calculus C + A × B by the four-port circular waveguide are discussed in detail. Compared with other acoustic logic gates, the device has the advantages of broad bandwidth, uniform threshold, simple structure, and easy connection, which provides diverse routes to construct devices for acoustic communication and computation.