Patent ID: 8837257
Filing Date: 2014-09-16
Classification: H04S

Abstract:
1. A computer-implemented method for generating a modulated acoustic carrier signal for wireless transmission from a speaker of a transmit device to a microphone of a receive device, comprising: converting a message to binary data; modulating one or more selected frequencies for one or more acoustic carrier signals based on the binary data to generate one or more modulated acoustic carrier signals; filtering the one or more modulated acoustic carrier signals to remove any unintended audible harmonics created during modulation, including to reduce audibility of the modulated acoustic carrier signal, the filtering further including; storing the modulated acoustic carrier signal in a buffer for subsequent output and transmission by the speaker as audio over air for receipt by the microphone of the receive device; and, in response to the microphone of the receive device receiving the one or more modulated acoustic carrier signals, demodulating the one or more modulated acoustic carrier signals to recover the binary data using an acoustic modulation protocol by: