Abstract: A moving objects detection method is disclosed. The method may include: identifying a plurality of feature points based on a plurality of video frames; selecting from the plurality of feature points to form a first and a second groups of feature points based on correlations between the plurality of feature points; and identifying in at least one video frame two segments based on the first and the second groups of feature points, respectively, as detected moving objects, where a correlation between two feature points may include a distance component and a movement difference component, where the distance component is related to a distance between the two feature points, and the movement difference component is related to a difference between corresponding movements of the two feature points. A moving objects detection system is also provided.

Abstract: A communication method and system in an Ad-Hoc network using a RR-ALOHA based protocol are provided. The method may include: receiving a data frame which includes N slots, where N is a positive integer greater than two, where a slot includes a payload and a frame information field, where a frame information field includes N sub-frame information fields which correspond to the N slots, respectively, where a sub-frame information field includes a source temporary identifier field for indicating which node occupies its corresponding slot; and if a source temporary identifier field contained in the received data frame equals to a first predetermined value representing the status of free, determining that a corresponding slot is free and can be reserved. By using the method of the disclosure, communication efficiency is improved.

Abstract: A directional alert system within a vehicle is configured to transmit an alert signal towards a specifically targeted area without substantially affecting the acoustic environment in a broader surrounding area. The directional alert system determines the target area by processing sensor data reflects a direction that a driver of the vehicle is looking or facing. The directional alert system then positions an acoustic transducer to generate an acoustic signal towards the direction of interest. The directional alert system may also wirelessly pair with computing devices residing in a target region associated with the direction of interest, and transmit wireless notifications to those computing devices to alert the users of those devices.

Abstract: A planar loudspeaker includes a shell pot, a magnet, a diaphragm, and a face plate. The magnet may be positioned in a cavity in the shell pot. The diaphragm may be coupled with the shell pot to cover an entrance to the cavity. The shell pot may include a conductive path having an inner contact proximate the central axis of the diaphragm, and an outer contact proximate to a perimeter of the diaphragm. The face plate may be coupled with the shell pot so that the diaphragm is positioned between the magnet and the faceplate. The face plate may include an inner terminal and an outer terminal that are aligned to be in direct contact with the respective inner contact and the outer contact of the diaphragm and form an electrical connection there between when the face plate is coupled with the shell pot. The inner and outer terminals may be coupled with a source of electrical signals, such as an audio amplifier.