A range-finding and/or object-positioning system comprises one or more target devices; one or more reference devices communicating with said one or more target devices via one or more wireless signal sets, each wireless signal set comprising at least a first-speed signal having a first transmission speed and a second-speed signal having a second transmission speed, and the first transmission speed being higher than the second transmission speed; and at least one processing unit performing actions for determining at least one distance between one target device and one reference device based on the time difference between the receiving time of the first-speed signal and the receiving time of the second-speed signal of the wireless signal set communicated between said reference and target devices.

The present technology relates to a signal processing device, a signal processing method, and a program that can provide sound with more increase in realistic sense by restoring a difference of sound pressure between sound sources.

The signal processing device includes: an acoustic signal obtaining unit that obtains an acoustic signal; a sound source positional information obtaining unit that obtains sound source positional information relating to a distance between a sound source and a sound collecting unit that collects sound from the sound source; a listening positional information obtaining unit that obtains listening positional information relating to a distance between a reproducing device that reproduces the acoustic signal and a listener who listens to sound reproduced by the reproducing device; and a correcting unit that corrects gain of the acoustic signal on a basis of the sound-source positional information and the listening positional information. The present technology can be applied to, e.g., a TV telephone system.

The present technology relates to a signal processing device, a signal processing method, and a program that can provide sound with more increase in realistic sense by restoring a difference of sound pressure between sound sources.

The signal processing device includes: an acoustic signal obtaining unit that obtains an acoustic signal; a sound source positional information obtaining unit that obtains sound source positional information relating to a distance between a sound source and a sound collecting unit that collects sound from the sound source; a listening positional information obtaining unit that obtains listening positional information relating to a distance between a reproducing device that reproduces the acoustic signal and a listener who listens to sound reproduced by the reproducing device; and a correcting unit that corrects gain of the acoustic signal on a basis of the sound-source positional information and the listening positional information. The present technology can be applied to, e.g., a TV telephone system.

The embodiments described herein provide ranging capabilities in RF-opaque environments, such as a jungle, utilizing transponders located on a property line. In particular, the embodiments described herein provide for determining a perpendicular distance to a property line from a ranging device. The transponders are located on the property line and a separated from each other by a known distance. The ranging device transmits RF signals to the transponders, which are received by the transponders and re-broadcasted back to the ranging device on a different frequency. The ranging device uses information about the transmitted and received RF signals and the known distance to calculate a perpendicular distance from the ranging device to the property line.

The embodiments described herein provide ranging capabilities in RF-opaque environments, such as a jungle, utilizing transponders located on a property line. In particular, the embodiments described herein provide for determining a perpendicular distance to a property line from a ranging device. The transponders are located on the property line and a separated from each other by a known distance. The ranging device transmits RF signals to the transponders, which are received by the transponders and re-broadcasted back to the ranging device on a different frequency. The ranging device uses information about the transmitted and received RF signals and the known distance to calculate a perpendicular distance from the ranging device to the property line.

A method is described for determining a position of a user device in relation to a vehicle, the vehicle including first and second receivers. The method includes transmitting a positioning signal by the transmitter of the user device, receiving the positioning signal by the first receiver and by the second receiver arranged at a distance from the first receiver, in at least one of the first and second receivers, receiving and identifying a reflected positioning signal reflected at a ground surface before reaching the first and second receivers, performing time synchronization between the transmitter and the first and second receiver, determining a position of the user device in a three-dimensional coordinate system based on a time-of-flight of the positioning signal received in the first and second receivers and on a time-of-flight of at least one reflected positioning signal received by at least one of the first and second receivers.

The system (10) of FIG. 1 uses fixedly-located master and slave smartphone devices (12, 14) to determine a player position of a player (20) within playing arena, such as a tennis court. The master device (12) makes a local determination of the speed of sound using an audible ping to the slave device displaced from the master device by a known distance. The slave device (14) also responds with a time stamp associated with the receipt of one or more pings. Correlation over successive RF-reported time stamps allows the master device (12) to assess, relative to its own internal reference clock, a time offset and drift for a local clock in the slave device (14). A RF connection to a communications circuit and sensor (18) arrangement located in a racket held by a player permits the master device (12) to assess a time offset and drift for a local clock associated with the sensor. The sensor (18) further includes a gyroscope, accelerometer and magnetometer that cooperate to record movement or orientation of the racket, and which information is uplink reported over the RF connection to the master device. When an amplitude or modelled sound profile for a hit event (24) is detected by both the master and slave devices (12, 14) and the hit event time-stamped by the devices in the system and reported to the master by the communications circuits of the racket and slave units, the master unit is able to triangulate the position of the hit event relative to known dimensions of the playing arena. Continuous reporting of movement of the racket relative to the previous hit event can therefore be displayed to show movement of the player around the court relative to detected sound events.

The system (10) of FIG. 1 uses fixedly-located master and slave smartphone devices (12, 14) to determine a player position of a player (20) within playing arena, such as a tennis court. The master device (12) makes a local determination of the speed of sound using an audible ping to the slave device displaced from the master device by a known distance. The slave device (14) also responds with a time stamp associated with the receipt of one or more pings. Correlation over successive RF-reported time stamps allows the master device (12) to assess, relative to its own internal reference clock, a time offset and drift for a local clock in the slave device (14). A RF connection to a communications circuit and sensor (18) arrangement located in a racket held by a player permits the master device (12) to assess a time offset and drift for a local clock associated with the sensor. The sensor (18) further includes a gyroscope, accelerometer and magnetometer that cooperate to record movement or orientation of the racket, and which information is uplink reported over the RF connection to the master device. When an amplitude or modelled sound profile for a hit event (24) is detected by both the master and slave devices (12, 14) and the hit event time-stamped by the devices in the system and reported to the master by the communications circuits of the racket and slave units, the master unit is able to triangulate the position of the hit event relative to known dimensions of the playing arena. Continuous reporting of movement of the racket relative to the previous hit event can therefore be displayed to show movement of the player around the court relative to detected sound events.

A bed proximity-determining system includes communications functionality and an ability to determine the proximity of a caregiver to a bed. Based on that proximity, the system transmits commands to the bed or a local system.

Systems and methods of estimating a location of a mobile computing device are provided. For instance, acoustic signals can be received from one or more transmitting devices associated with a real-time locating system. A set of peaks can be selected from the received acoustic signals. A first set of transmitter locations can be assigned to the selected set of peaks. The first set of transmitter locations can be specified by an acoustic model specifying a plurality of transmitter locations within an acoustic environment in which the one or more transmitting devices are located. A first model path trace associated with the first set of transmitter locations can be compared to the received acoustic signals. A location of the mobile computing device can be estimated based at least in part on the comparison.