Patent ID: 7035757

Claim:
A method comprising: an actuator of a first computing device generating an acoustic signal; a sensor of a second computing device receiving the acoustic signal; generating an estimate of a time for the acoustic signal to travel from the actuator to the sensor, wherein the sensor and actuator are unsynchronized; a third computing device computing, based on the time estimate, a physical location of at least one of a set including the sensor of the second computing device and the actuator of the first computing device, a sensor of fourth computing device receiving the acoustic signal; and generating a second estimate of a time for the acoustic signal to travel from the actuator to the sensor of the fourth computing device, wherein the actuator of the first computing device and the sensor of the fourth computing device are unsynchronized; and the third computing device computing, based on the second estimate of time, a physical location of at least one of a set including the sensor of the fourth computing device and the actuator of the first computing device.