Abstract: A portable loudspeaker includes an electro-acoustic driver which creates sound waves when operated and a housing having a front side to which the driver is secured. The loudspeaker also includes a battery supported by the housing for providing electrical power to the driver and a cover secured to the housing which can be moved between (i) a closed position in which the cover overlies the driver, and (ii) an open position in which the cover does not overlie the driver. A controller controls operation of the loudspeaker. When the cover is moved to the closed position, a feature on the cover causes an indication to the controller that the cover is in the closed position. In response to the indication, the controller mutes the driver if the driver was outputting acoustic waves when the cover was moved to the closed position.

Abstract: A method of fabricating a MEMS piezoelectric resonator system includes forming a stack of layers on a substrate, the stack comprising at least one piezoelectric material layer spaced from the substrate by a sacrificial layer, patterning the stack to form a plurality of edge coupled resonators, and removing at least a portion of the sacrificial layer to suspend the resonators relative to the substrate.

Abstract: A resonator system wherein a plurality of resonators each including piezoelectric material are suspended relative to a substrate. An edge of each resonator is mechanically coupled to an edge of another resonator and the plurality of resonators expand and contract reaching resonance in response to an applied electric field.

Abstract: A resonator system wherein a plurality of resonators each including piezoelectric material are suspended relative to a substrate. An edge of each resonator is mechanically coupled to an edge of another resonator and the plurality of resonators expand and contract reaching resonance in response to an applied electric field.