Abstract: A system and method for simultaneous recharging of multiple electronic devices a large area surface includes a placement surface the electronic devices and an interior area beneath the placement surface. Multiple mobile recharging assemblies are disposed in the interior area, each one including having wheels and sensors. A charging device is situated atop each mobile recharging assembly. An obstacle sensor detects obstacles and a controller is operable to signal the motion assembly to avoid obstacles. A charge sensor detects a battery on the placement surface in need of a charge. When a battery in need of a charge is detected, the charging device (coil) is energized to recharge the located battery. Once the charge sensor is indicative of having located a respective electronic device in need of a charge, a control system energizes a next mobile charging assembly to move and find a battery in need of a charge.

Abstract: Hierarchical signal bias removal (HSBR) signal conditioning uses a codebook constructed from the set of recognition models and is updated as the recognition models are modified during recognition model training. As a result, HSBR signal conditioning and recognition model training are based on the same set of recognition model parameters, which provides significant reduction in recognition error rate for the speech recognition system.