Patent ID: 9025416
Filing Date: 2015-05-05
Classification: G01S

Abstract:
1. A method of calculating position of a device within a video surveillance system, the method comprising: generating a reference sound; emitting, at a first device, the reference sound; detecting, at the first device, a responsive reference sound from each of one or more second devices in response to the emitted reference sound; identifying a position of each of the one or more second devices; obtaining information relating to a latency of each of the one or more second devices; computing a round trip time associated with each of the one or more second devices based on at least a timing of detecting each of the one or more responsive reference sounds and the latency of each of the one or more second devices; and estimating the position of the first device according to the round trip time and the position associated with each of the one or more second devices, wherein the estimating comprises converting the round trip time associated with each of the one or more second devices to the distance between the first device and each of the one or more second devices based on a sample rate of the reference sound and each of the one or more responsive reference sounds.