Abstract: A load sensor compares generated values of load signals to predicted values of the load signals. Where an error between a generated value and a predicted value is less than a threshold, a value of zero is transmitted by the load sensor to an external systems, in an encoded stream of bits, and the error are used to calculate a predicated value of a next load signal, such that insubstantial changes in loading resulting in small errors are not transmitted to the external system. Where an error between the generated value and the predicted value exceeds the threshold, however, a value representative of the error is transmitted to the external system, in an encoded stream of bits. The external system processes the stream of bits to calculate the error, to determine that an item has been placed on a storage system or removed therefrom, or to identify the item.

Abstract: An apparatus includes a platform or other accessory that is supported by one or more transducer assemblies using piezoelectric transducers. In one implementation, a saddle structure provides mechanical support to a platform while transferring force from a load onto a portion to which a pair of piezoelectric transducers are affixed. As a load on the saddle changes, the resulting change in strain on the portion produces signals from the piezoelectric transducers. In another implementation a beam provides mechanical support to a platform or other accessory. A pair of piezoelectric transducers are affixed near a strain concentrator, such as a hole in the beam, produce signals indicative of a change in load on the beam.

Abstract: A fixture includes a shelf upon which items may be placed. In one implementation, the shelf is supported by four load cells that provide load cell data that may be used to calculate weight data for the load on the shelf. The load cells are mounted underneath a frame, with an upper portion of a load mount extending upward through the frame and engaged to the shelf. The shelf and the frame include stiffeners to increase rigidity, improving the quality of the load cell data. Electronics and a wiring harness are located underneath the frame. In this configuration, assembly of the fixture may be accomplished completely from the underside, simplifying assembly.

Abstract: An audio mixer (20) include a chassis (22) adapted to receive a docking tray assembly (24), which in turn is adapted to receive a computing device (26). The computing device functions to operate and control the audio mixer (20), and to this end includes a touch screen display (28). The docking tray assembly (24) includes formed tray (110) and, optionally, an adapter configured as a formed insert (112) that nests with the tray (110) to dock a computing device of a configuration different from the computing device docked directly with the tray (110).

Abstract: An audio mixer (20) include a chassis (22) adapted to receive a docking tray assembly (24), which in turn is adapted to receive a computing device (26). The computing device functions to operate and control the audio mixer (20), and to this end includes a touch screen display (28). The docking tray assembly (24) includes formed tray (110) and, optionally, an adapter configured as a formed insert (112) that nests with the tray (110) to dock a computing device of a configuration different from the computing device docked directly with the tray (110).