Patent ID: 8532644

Claim:
A system effective to provide content to a user, the system comprising: a sound device effective to modulate a code by assignment of a first set of frequencies for a logic 0 and a second set of frequencies for a logic 1 to produce a modulated code, and output the modulated code; a smart phone in communication with the sound device, the smart phone effective to receive the modulated code, demodulate the modulated code to reproduce the code; send the code over a network as a query to a processor; the processor effective to receive the query including the code, determine content associated with the code, and send the content to the smart phone; and the smart phone further effective to receive the content and output the content; wherein the sound device is effective to output the modulated code through sound pulses where each sound pulse is of a time duration and of the first set of the frequencies or the second set of frequencies, wherein the sound device is effective to output a clock pulse in a third set of frequencies prior to the sound pulses.