A mechanically driven, rotating-plate modulation of three coupled Helmholtz resonators produces strong nonreciprocal sound circulation in air at audible frequencies.
In experiment, we only consider the three harmonics 𝑛 = {−1,0,1} that dominate the field in the frequency range of interest
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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.