Audio localization using audio signal encoding and recognition

摘要

A positioning network comprises an array of signal sources that transmit signals with unique characteristics that are detectable in signals captured through a sensor on a mobile device, such as a microphone of a mobile phone handset. Through signal processing of the captured signal, the positioning system distinguishes these characteristics to identify distinct sources and their corresponding coordinates. A position calculator takes these coordinates together with other attributes derived from the received signals from distinct sources, such as time of arrival or signal strength, to calculate coordinates of the mobile device. A layered protocol is used to introduce distinguishing characteristics in the source signals. This approach enables the use of low cost components to integrate a positioning network on equipment used for other functions, such as audio playback equipment at shopping malls and other venues where location based services are desired.

主权项

1. A method of determining position of a mobile device comprising:
receiving, at one location, audio signals from two or more different audio sources that overlap in time, in a microphone of the mobile device, wherein the audio signals sound substantially similar to a human listener, yet have different characteristics to distinguish among the different audio sources; distinguishing the audio signals from each other based on two or more layers of distinguishing characteristics determined from the audio signals, wherein a first layer provides information to identify a group of audio sources, and a second layer provides information to identify a particular audio source within the group; based on identifying particular audio sources, determining location of the particular audio sources; determining position of the mobile device based on the locations of the particular audio sources.