SYSTEMS, METHODS AND APPARATUS FOR TRANSMITTING DATA OVER A VOICE CHANNEL OF A WIRELESS TELEPHONE NETWORK USING MULTIPLE FREQUENCY SHIFT-KEYING MODULATION

  • US 20090247152A1
  • Filed: 03/31/2008
  • Published: 10/01/2009
  • Est. Priority Date: 03/31/2008
  • Status: Active Grant
First Claim
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1. A method for transmitting data between a client device and a remote device, the method comprising:

  • identifying multiple bits (M) of data for transmission from a client device to a remote device;

    selecting a frequency corresponding with a value of the data from a plurality of discrete frequency tones, each of the discrete frequency tones representing multiple bit (M) values of input data;

    modulating an audio signal based on the selected frequency; and

    transmitting the audio signal from the client device to the remote device over a voice channel of a wireless telephone network.

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