Positioning using audio recognition

A method comprising:

• receiving, by a mobile device comprising a processor, reference audio fingerprints and metadata respectively associated with the reference audio fingerprints, wherein the reference audio fingerprints respectively correspond audio announcements and the metadata is respectively related to the audio announcements;
• storing, by the mobile device, the reference audio fingerprints and the metadata in memory of the mobile device;
• extracting, by the mobile device, interest points from an audio signal in response to detection of the audio signal by the mobile device;
• determining audio fingerprints based on the interest points;
• and
• rendering metadata associated with one of the reference audio fingerprints in response to a determination that one of the audio fingerprints matches the one of the reference audio fingerprints.

A tangible computer-readable storage medium comprising computer-readable instructions that, in response to execution, cause a computing system to perform operations, comprising:

• extracting interest points from an audio signal in response to detection of the audio signal by a device;
• determining audio fingerprints based on the interest points;
• comparing the audio fingerprints to reference audio fingerprints stored in memory of the device, wherein the reference audio fingerprints respectively correspond audio announcements and the reference audio fingerprints are respectively associated with metadata related to the audio announcements;
• and
• rendering metadata associated with one of the reference audio fingerprints in response to a determination, based on the comparing, that one of the audio fingerprints matches the one of the reference audio fingerprints.