A method for detecting a position of a mobile body moving on a plane includes setting X-axis and Y-axis direction reference lines on the plane, disposing a dummy mobile body on intersection points of the reference lines, detecting a position of the dummy mobile body, determining position variation amounts at the intersection points as an X-axis direction error and a Y-axis direction error based on a difference from true position data, determining X-axis and Y-axis direction error approximate formulas based on the errors to calculate errors at each position on the reference lines, detecting the position of the mobile body, correcting acquired detected X-Y coordinate data by a linear interpolation method using the X-axis and Y-axis direction error approximate formulas, and obtaining position data close to the true position of the mobile body.

The present disclosure relates to a location determination system that includes acoustic transmitting devices (104), location tags (112), and a wireless mesh network (106), where the wireless mesh network uses battery-powered devices. A location tag receives acoustic signals (e.g., ultrasound signals) from an acoustic transmitting device. Clocks from members of the wireless mesh network are synchronized by observation of clock pairings, each clock pair formed by respective clocks in a transmitting device that transmits a message and a receiving device that receives the message. By analyzing the observed clock pairings, a best fit between the clock pairings may be determined. After selecting a reference clock, an acoustic transmission schedule may be propagated to the respective acoustic transmitting device.

A system and methods for estimating the location of a mobile device are disclosed. In accordance with one embodiment, a mobile device located within a first corridor of a building receives (1) a first wireless electromagnetic signal and a first ultrasound signal from a first beacon located in the first corridor, (2) a second wireless electromagnetic signal and a second ultrasound signal from a second beacon located in the first corridor, and (3) a third wireless electromagnetic signal from a third beacon located in a second corridor of the building. The first wireless electromagnetic signal, the first ultrasound signal, the second wireless electromagnetic signal, and the second ultrasound signal are used to estimate a location of the mobile device.

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.

A location position system can include a plurality of beacons arranged a grid formation divided into a plurality of sub-grids. A mobile computing device can implement a location position application and can receive a radio signal from a particular beacon of the plurality of beacons. The radio signal can comprise a data component uniquely identifying the particular beacon, which can be used to identify a particular sub-grid of the plurality of sub-grids. An audio signal can be received from each of a set of sub-grid beacons associated with the particular sub-grid. Each audio signal can: (i) have a frequency in the frequency range of 16 kHz to 24 kHz and a transmission delay from a reference time, (ii) lack any additional identifying data, and (iii) be separately transmitted from the radio signal transmitted by the particular beacon. The mobile computing device can determine its position based on the received audio signals.

A location position system can include a plurality of beacons arranged a grid formation divided into a plurality of sub-grids. A mobile computing device can implement a location position application and can receive a radio signal from a particular beacon of the plurality of beacons. The radio signal can comprise a data component uniquely identifying the particular beacon, which can be used to identify a particular sub-grid of the plurality of sub-grids. An audio signal can be received from each of a set of sub-grid beacons associated with the particular sub-grid. Each audio signal can: (i) have a frequency in the frequency range of 16 kHz to 24 kHz and a transmission delay from a reference time, (ii) lack any additional identifying data, and (iii) be separately transmitted from the radio signal transmitted by the particular beacon. The mobile computing device can determine its position based on the received audio signals.

Organism monitoring systems and devices and associated monitoring methods are described. According to one aspect, an organism monitoring device configured to be associated with an organism to be monitored includes a housing, a battery coupled with the housing, wherein the battery is configured to store electrical energy, a transmitter coupled with the housing and the battery, wherein the transmitter is configured to emit a wireless signal externally of the organism monitoring device and the organism being monitored, sensor circuitry coupled with the housing and the battery, wherein the sensor circuitry is configured to monitor an environment of the organism monitoring device, and control circuitry coupled with the housing, the sensor circuitry and the battery, and wherein the control circuitry is configured to adjust an operation of the organism monitoring device as a result of monitoring of the environment of the organism monitoring device by the sensor circuitry.

A method comprises outputting at least one test signal to a listening environment via a loudspeaker, receiving each of the at least one test signal via a microphone arranged in the listening environment, determining at least one of a position and an orientation of the microphone in the listening environment with respect to the loudspeaker at the time of receipt of each of the at least one test signal, evaluating the test signals received by the microphone, and determining at least one aspect related to at least one transfer function based on the evaluation of the test signal and on at least one of the position and the orientation of the microphone.

A method comprises outputting at least one test signal to a listening environment via a loudspeaker, receiving each of the at least one test signal via a microphone arranged in the listening environment, determining at least one of a position and an orientation of the microphone in the listening environment with respect to the loudspeaker at the time of receipt of each of the at least one test signal, evaluating the test signals received by the microphone, and determining at least one aspect related to at least one transfer function based on the evaluation of the test signal and on at least one of the position and the orientation of the microphone.

A compact, integrated acoustic localization and communications array includes an air-backed transmit element having a first end on which an end cap is disposed, and a second end configured to be mounted to a mounting surface. A volumetric acoustic array including a plurality of receiver elements that is electrically integrated to the transmit element. The localization and communications array is configured to transmit, via the transmit element, and receive, via the plurality of the receiver elements, an acoustic signal having a frequency in the range of 10 kHz to 50 kHz. Each of the plurality of receiver elements are spaced apart from the end cap at least a distance. The distance is greater than ¼ of a wavelength associated with the frequency transmitted and received by the localization and communications array, and is not equal to an odd multiple of ¼ of the wavelength.