Patent ID: 8068792

Claim:
A system for receiving a data payload over a voice channel of a telecommunications network, comprising: a vocoder component for decoding a digital data stream received from the voice channel of the telecommunications network into audio tones, the audio tones representing voice data and the data payload; a frequency conversion component for converting the audio tones into at least one data packet including a preamble and the data payload; a packet disassembling component for extracting the data payload from the at least one data packet; and a storage component for storing the data payload; wherein the frequency conversion component includes: a first bandpass filter for attenuating frequencies outside of a range of frequencies, the range of frequencies including audio tones that represent a binary “0” bit and a binary “1” bit; a second bandpass filter for attenuating frequencies inside of the range of frequencies; a SNR component coupled to an output of the first bandpass filter and an output of the second bandpass filter, the SNR component determining a signal-to-noise ratio between the output of the first bandpass filter and the output of the second bandpass filter; and a comparator coupled to the SNR component, the comparator identifying audio tones representing the data payload when the signal-to-noise ratio exceeds a threshold.