In accordance with the present invention, an apparatus initiates a transaction and includes an acoustic data receiver, and microphone for receiving an audio signal having encoded data that is non-discernable by a listener and is transmitted as part of the audio signal. The microphone converts the sound...http://www.google.fr/patents/US6125172?utm_source=gb-gplus-shareBrevet US6125172 - Apparatus and method for initiating a transaction having acoustic data receiver that filters human voice
Apparatus and method for initiating a transaction having acoustic data ...
