Abstract: Communicating data is disclosed. A time delay encoding a data to be communicated is selected. A sonic signal is combined with a version of the sonic signal that is delayed by the selected time delay. The data is communicated at least in part by transmitting the combined signal to a mobile device.

Abstract: The invention can be a simple method for data transfer from one electronic device to another. In this embodiment, a sender can upload data to a server using an out-of-band connection while broadcasting an identification signal over one or several mediums, such as acoustic and/or radio (Ultrasound, Bluetooth, infrared, etc. . . . ). In the case that a connection to the server can be established, the receiver will detect the identification signal, decode it, and request the information from the server. The receiver can then send an authorization for a transaction through the server via an out-of-band connection or directly to the sender via one of the primary communication mediums, at which point the transaction is complete.