The present disclosure relates to an acoustic position determination system that includes a mobile communication device and at least one base transmitter unit. The mobile communication device is configured to transmit and receive acoustic signals. Due to relative movements between the mobile communication device and the base transmitter unit, frequencies of the received signals shift due to Doppler effect. The mobile communication device is configured to compensate Doppler frequency shifts in the received acoustic signals prior to performing a deconvolution decoding process. The mobile communication device is further configured to compensate Doppler frequency shifts and perform deconvolution decoding process on acoustic signals received from multiple signal transmission paths.

A position locating system that locates relative position information between a marine vessel and a trailer includes a wave signal generator located on a first object that is one of the marine vessel and the trailer to emit wave signals from at least three different positions having known relative positional relationships with each other, a wave signal receiver located a second object that is the other of the marine vessel and the trailer to receive the wave signal emitted from each of the positions of the wave signal generator, and a position locator configured or programmed to locate relative position information between the marine vessel and the trailer that includes at least a direction of the second object as viewed from the first object based on the wave signal from each of the positions received by the wave signal receiver.

A position locating system that locates relative position information between a marine vessel and a trailer includes a wave signal generator located on a first object that is one of the marine vessel and the trailer to emit wave signals from at least three different positions having known relative positional relationships with each other, a wave signal receiver located a second object that is the other of the marine vessel and the trailer to receive the wave signal emitted from each of the positions of the wave signal generator, and a position locator configured or programmed to locate relative position information between the marine vessel and the trailer that includes at least a direction of the second object as viewed from the first object based on the wave signal from each of the positions received by the wave signal receiver.

A method for obtaining a position of a peripheral device for an audiovisual entertainment system, the method comprising: controlling an audio source to output an audio signal at a first time; determining a second time at which the audio signal arrives at an audio detector, wherein the peripheral device comprises at least one of the audio source and audio detector; and estimating a position of the peripheral device based on an acoustic time-of-flight between the first time and the second time

A system for generating outputs to a user in dependence upon audio emitted by one or more audio markers, the system comprising an audio detection unit operable to detect audio emitted by one or more of the audio markers, the audio markers being configured to emit audio in accordance with one or more predetermined conditions, an audio marker locating unit operable to determine one or more properties, including at least a proximity to a user, of audio markers in dependence upon the detected audio corresponding to that audio marker, and a rendering unit operable to output one or more images for display to a user in dependence upon one or more of the determined properties of the one or more audio markers.

The present invention provides methods and systems for tracking motion in multiple dimensions, including multiple dimensions, including a transmitter probe fixture, a receiver array, and an electronic control unit.

An underwater celestial navigation beacon configured to provide position information is disclosed. The underwater celestial navigation beacon can include a data store configured to store an astronomical model of the moon. The underwater celestial navigation beacon can include an inertial measurement unit (IMU) operable to capture IMU data that includes three-axis acceleration data and three-axis rate gyroscopic data. The underwater celestial navigation beacon can include a controller. The controller can determine a latitude of the underwater celestial navigation beacon using the three-axis rate gyroscopic data. The controller can determine a longitude of the underwater celestial navigation beacon based on a gravitational pull of the moon, using the three-axis acceleration data and the astronomical model of the moon. The controller can determine the position information for the underwater celestial navigation beacon based on the latitude and longitude.

Input data, such as audio and/or video data, may be captured from a first room, for example via microphones and/or cameras within the first room. A first quantity of people within the first room may be determined based at least in part on the input data. An alert may be provided when the first quantity of people exceeds a threshold quantity of people. Additionally, locations of people within the room may also be detected based at least in part on the input data. A first proximity of a first person in the room to a second person in the room may be determined. An alert may also be provided when the first proximity is less than a threshold proximity.

A system configured to perform sound source localization (SSL) using reflection classification is provided. A device processes audio data representing sounds from multiple sound sources to generate sound track data that includes an individual sound track for each of the sound sources. To detect reflections, the device determines whether a pair of sound tracks are strongly correlated. For example, the device may calculate a correlation value for each pairwise combination of the sound tracks and determine whether the correlation value exceeds a threshold value. When the correlation value exceeds the threshold, the device invokes a reflection classifier trained to distinguish between direct sound sources and reflected sound sources. For example, the device extracts feature data from the pair of sound tracks and processes the feature data using a trained model to determine which of the sound tracks corresponds to the direct sound source.

A wearable device is described that is configured to alert a subject prior to encountering an obstacle. The subject may be visually-impaired. The device includes: a mobile transceiver tag adapted to be worn by a subject within a designated area (e.g., a swimming pool); three or more stationary transceiver beacons in spaced apart, fixed positions; a wearable signal output device (e.g., headset); and a processor with software that can calculate the subject's position relative to one or more obstacles (e.g., end of swimming lane) and sends a left, right, or reverse signal to the signal output device.