Abstract: A venting device includes a first flap, which is configured to be actuated to swing upward during a rising time, and a second flap, which is disposed opposite to the first flap and configured to be actuated to swing downward during a falling time, a first actuating portion disposed on the first flap, and a second actuating portion disposed on the second flap. The venting device configured to form a vent is disposed within a wearable sound device or to be disposed within the wearable sound device. The vent is formed via applying a first voltage to the first actuating portion and applying a second voltage on the second actuating portion, such that the venting device gradually forms the vent.

Abstract: A clocking system for complex electronic devices is created in an hierarchial manner whereby the master clock pulse is provided to a plurality of digital pulse aligners which in turn provide phase aligned clock signals at the field replaceable unit level to either a slave clock or a digital phase aligner. The slave clock or the digital phase aligner at the field replaceable unit level in turn provides an aligned clock pulse to a timing node on respective chips. A third level of the hierarchy provides similarly aligned pulses to individual using-circuits on the chips of the system. The digital phase aligner, aligning the output pulse at the timing node of the next level with the reference pulses being provided to the digital phase aligner at each level, insures that the timing pulses arriving at the utilizing circuits are synchronously aligned with clock pulses of the master clock.