A mechanically driven, rotating-plate modulation of three coupled Helmholtz resonators produces strong nonreciprocal sound circulation in air at audible frequencies.
In addition, the proposed modulation strategy is a purely mechanical, magnetless, cost -effective, linear, low-noise system that is easily tunable and scalable
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Experimental demonstration of a space-time modulated airborne acoustic circulator
A mechanically driven, rotating-plate modulation of three coupled Helmholtz resonators produces strong nonreciprocal sound circulation in air at audible frequencies.