MOBILE DEVICE INDOOR NAVIGATION

摘要

An audio playback system receives digitally watermarked audio programming and distributes it to audio speakers in a venue, enabling a variety of location and product dependent services to be delivered to mobile devices in the venue. Mobile devices sense audio from speakers and decode digital identifying information, including characteristics to distinguish audio sources. The mobile device communicates with a networked computer to provide the identifying information, which in turn, triggers an alert for output on the mobile device.

主权项

1. A method for audio signaling for indoor positioning in a venue comprising:
receiving at a processor in a venue, an audio signal program in which at least a first watermark layer is embedded, the first watermark layer conveying an identifier; for each of plural speakers in the venue, altering the audio signal program to include distinguishing characteristics corresponding to a speaker from which the audio signal is to be played; transmitting the altered audio signal programs to corresponding speakers in the venue for playback; receiving from a mobile device, a distinguishing characteristic corresponding to a first speaker and an auxiliary signal decoded from an electronic audio signal sensed by a microphone on the mobile device, the auxiliary signal comprising the identifier; based on the distinguishing characteristic and the identifier, selecting an alert associated with the first speaker; and triggering the alert for output on the mobile device.