Abstract: In an embodiment, the present invention is a method for ranging which includes emitting an acoustic signal at a first frequency, monitoring for a first acoustic response signal at a second frequency, and responsive to receiving the first acoustic response signal within a predetermined amount of time, (1) calculating a first distance between a first device and a second device based on a duration between emitting the first acoustic signal and receiving the first acoustic response signal, and (2) broadcast a first message including the distance and an identifier.

Abstract: In an embodiment, the present invention is a method for ranging which includes emitting an acoustic signal at a first frequency, monitoring for a first acoustic response signal at a second frequency, and responsive to receiving the first acoustic response signal within a predetermined amount of time, (1) calculating a first distance between a first device and a second device based on a duration between emitting the first acoustic signal and receiving the first acoustic response signal, and (2) broadcast a first message including the distance and an identifier.

Abstract: A mobile device locationing system that overrides the reported position with that of the charge room when the AC charge signal is detected by the device.

Abstract: A method and apparatus for automatic gain control in a frame-aware pulsed ranging system is disclosed. A frame covers a period of time, and locationing pulses are emitted once per frame. The pulses are detected by a mobile unit with a microphone, which is able to trilaterate its physical position. To counteract false positives from reverberations of pulses emitted in prior frames, a noise threshold function declines over the course of the frame. As such, small amplitude locationing pulses received late in a frame are still detected because the small amplitude pulse exceeds the decayed noise threshold function. In this way, the noise threshold function is a filter that may detect high amplitude pulses early in a frame as well as small amplitude pulses late in a frame without detecting reverberation pulses early in a frame as false positives.

Abstract: A mobile device locationing system that overrides the reported position with that of the charge room when the AC charge signal is detected by the device.

Abstract: A mobile device locationing system that overrides the reported position with that of the charge room when the AC charge signal is detected by the device.

Abstract: A mobile device locationing system that overrides the reported position with that of the charge room when the AC charge signal is detected by the device.

Abstract: A method and apparatus for automatic gain control in a frame-aware pulsed ranging system is disclosed. A frame covers a period of time, and locationing pulses are emitted once per frame. The pulses are detected by a mobile unit with a microphone, which is able to trilaterate its physical position. To counteract false positives from reverberations of pulses emitted in prior frames, a noise threshold function declines over the course of the frame. As such, small amplitude locationing pulses received late in a frame are still detected because the small amplitude pulse exceeds the decayed noise threshold function. In this way, the noise threshold function is a filter that may detect high amplitude pulses early in a frame as well as small amplitude pulses late in a frame without detecting reverberation pulses early in a frame as false positives.