Abstract: A system for transmitting power and data through a solid medium includes a power signal transmitter configured to acoustically transmit power through the solid medium to a power signal receiver using a first frequency and a data signal transmitter configured to acoustically transmit data through the solid medium to a data signal receiver using a second frequency. The second frequency may be offset from the first frequency and from at least a first overtone of the first frequency. Furthermore, the data signal transmitter and data signal receiver may be positioned at a null of a pattern of acoustic waves produced by operation of the power signal transmitter. The system may further include a notch filter coupled to receive an electrical output of the data signal receiver, the notch filter being tuned to attenuate the first frequency.

Abstract: A system for check weighing the content of a blister strip which includes a guide adapted to receive a blister strip comprised of at least one blister, a punch aligned with the guide for receiving the at least one blister, an actuator engaged with the punch for driving the punch toward the blister strip, whereby the blister is punched from the blister strip, and a balance adapted to receive the punched blister for weighing the punched blister and generating a weight signal after subtracting a predetermined value representing the weight of an empty blister. An alternative method of determining the content of a blister strip comprises reflecting a beam of energy off of a blister strip and determining the height of the blister from the reflected energy. The measured height is compared to a predetermined height to derive the amount of powder contained therein.

Abstract: A system for check-weighing a metered dose powder inhaler blister comprises a guide (12) adapted to receive a blister strip (14) comprised of at least one blister, a punch (20) aligned with the guide (12) for receiving the at least one blister; an actuator (26) engaged with the punch (20) for driving the punch toward the blister strip (14), whereby the blister (18) is punched from the blister strip; and a balance (32) adapted to receive the punched blister (18) for weighing the punched blister (18) and generating a punched blister weight for the at least one blister.