Sonic Notify – A Platform That Enables Media To Be Delivered To a Smartphone or Tablet Through Sound 
http://sonicnotify.com/

Sonic Notify is a platform that enables media to be delivered to a smartphone or tablet based on presence. No technology to date has enabled media delivery based on a consumer standing in front of a shelf, television, or at a concert. The patent pending technology enables the communication of data in the ultra high-frequency inaudible range between any speaker and microphone. The decoding algorithm enables a common process for extracting data from audio using any microphone on any smartphone or tablet. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.