Patent ID: 8401569

Claim:
A system effective to provide content to a user, the system comprising: a sound device effective to output a sound wave including a modulated code; a smart phone in communication with the sound device, the smart phone effective to receive the modulated code, apply the modulated code to a transform to produce a signal, the signal relating to a volume magnitude of frequencies in the modulated code, apply the signal to a peak detector to produce a peak history, analyze the peak history to determine a proposed logic 0 and a proposed logic 1 for the modulated code, demodulate the modulated code with the proposed logic 0 and proposed logic 1 to reproduce the code, and 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.