Effect of time delay on the impedance control of a pressure-based, current-driven Electroacoustic Absorber

The pressure-based, current-driven impedance control technique known as “Electroacoustic Absorption” has offered new horizons for room modal equalization at low frequencies, steerable anomalous reflection, acoustic transmission attenuation and non-reciprocal wave propagation. Nevertheless, its level of performance is strongly limited by stability constraints. A primary source instability the loss acoustical passivity due to time delay in digital implementation controller. In this paper, effect on Electroacoustic Absorber verified correlating, both numerically experimentally, high frequencies upsurge a one-dimensional closed cavity. Then, we show placing porous layer front Absorber, allowing counteract enlarge margin. Finally, provide an integral constraint absorption spectrum valid architecture Absorber. It generalizes purely passive absorbers electro-active controlled loudspeakers, demonstrates close interdependence between bandwidth, passivity, electrical supply straightforward analytical expression.