Abstract: Systems and methods for charging unmanned aerial vehicles (UAVs) using ultra-low frequency wireless power transfer technology are disclosed herein. In some embodiments, a UAV can carry a wireless power transfer (WPT) unit configured to transfer power from a utility powerline to the UAV. The WPT unit can include a first field guiding portion configured to wirelessly couple to the powerline, a second field guiding portion operatively coupled to the first field guiding portion, and an induction coil operatively coupled to the UAV and at least partially wound around at least one of the first field guiding portion or the second field guiding portion. The first and second field guiding portions can be configured to guide a magnetic field generated by current passing through the powerline toward the induction coil for inductive charging. In some embodiments, the WPT unit can include a capacitor plate and a dielectric material for capacitive charging.

Abstract: An apparatus for hearing protection comprises a pair of earpads, a band, microphones, speakers, vibration generators, and a processing unit. Each of the earpads is placed over an ear of the user. The band extends between the pair of earpads. The microphones convert acoustic signals into electrical signals. The speakers are located on each of the pair of earpads and direct sound towards the ear. The vibration generators are located on at least one of the pair of earpads and generate vibratory feedback to the user. The processing unit is connected to the microphones, the speakers, and the vibration generators, and compares first parameters of the electrical signals from the microphones with second parameters of predetermined warning sounds to determine whether the electrical signals comprise one or more of the predetermined warning sounds.

Abstract: An apparatus for hearing protection comprises a pair of earpads, a band, microphones, speakers, vibration generators, and a processing unit. Each of the earpads is placed over an ear of the user. The band extends between the pair of earpads. The microphones convert acoustic signals into electrical signals. The speakers are located on each of the pair of earpads and direct sound towards the ear. The vibration generators are located on at least one of the pair of earpads and generate vibratory feedback to the user. The processing unit is connected to the microphones, the speakers, and the vibration generators, and compares first parameters of the electrical signals from the microphones with second parameters of predetermined warning sounds to determine whether the electrical signals comprise one or more of the predetermined warning sounds.

Abstract: An apparatus for hearing protection comprises a pair of earpads, a band, microphones, speakers, vibration generators, and a processing unit. Each of the earpads is placed over an ear of the user. The band extends between the pair of earpads. The microphones convert acoustic signals into electrical signals. The speakers are located on each of the pair of earpads and direct sound towards the ear. The vibration generators are located on at least one of the pair of earpads and generate vibratory feedback to the user. The processing unit is connected to the microphones, the speakers, and the vibration generators, and compares first parameters of the electrical signals from the microphones with second parameters of predetermined warning sounds to determine whether the electrical signals comprise one or more of the predetermined warning sounds.

Abstract: The present invention provides for a portable apparatus and method for detection of environmental warning signals. The apparatus having an acoustic input device configured to produce an electrical representation of detected environmental warning signals, an electronic pre-processing unit configured to determine if the electrical representation satisfies a primary set of criteria, an electronic post-processing unit configured to verify if the electrical representation satisfies a secondary set of criteria and a warning indicator configured to transmit an alarm notification.

Abstract: Embodiments include apparatuses, methods, and systems for an alternating current (AC) to direct current (DC) converter including a synchronous rectifier to convert an AC input signal to a DC output signal. The AC to DC converter may further include a feedback circuit coupled to an output terminal of the synchronous rectifier to sample the DC output signal and to generate a digital signal to represent a voltage of the DC output signal and a controller coupled to receive the digital signal from the feedback circuit. The controller may compare the digital signal to a threshold, and based on the comparison, control an adjustment of the voltage of the DC output signal. Additional embodiments may also be described.

Abstract: The present invention provides for a portable apparatus and method for detection of environmental warning signals. The apparatus having an acoustic input device configured to produce an electrical representation of detected environmental warning signals, an electronic pre-processing unit configured to determine if the electrical representation satisfies a primary set of criteria, an electronic post-processing unit configured to verify if the electrical representation satisfies a secondary set of criteria and a warning indicator configured to transmit an alarm notification.