1. A device, comprising: a memory having stored thereon computer executable components; and a processor configured to execute the following computer executable components stored in the memory: an indexing component configured to receive 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; an extraction component configured to extract interest points from an audio signal in response to detection of the audio signal by the device and compute audio fingerprints based on the interest points; and a matching component configured to render metadata associated with one of the reference audio fingerprints in response to a determination that one of the audio fingerprint matches the one of the reference audio fingerprints.