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Superposition of data over voice

  • US 20040146161A1
  • Filed: 01/09/2004
  • Published: 07/29/2004
  • Est. Priority Date: 09/29/1998
  • Status: Active Grant
First Claim
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1. Method of transmitting at least one message between at least a first communication device (2, 4, 6, 8, 10) and at least a second communication device (12, 14, 16, 18, 20), via a communication channel (22) allowing at least voice messages to be transmitted between said first and said second communication devices, said at least one message including data being subdivided in a sequence of basic data units, said method comprising the following steps:

  • a. encoding each of the basic data units as unique signals (usj), each unique signal (usj) comprising a predetermined number of basic signals (bi) each basic signal having a unique fixed frequency (f1);

    b. transmitting a sequence of unique signals (usj) between said first and said second communication devices during a sequence of fixed time periods (t1, t2, t3, . . . ), any one of said sequence of unique signals (usj) lasting at least one time period;

    c. receiving and decoding said sequence of unique signals (usj) into said sequence of basic data units;

    wherein said data is transmitted in said communication channel at least during a period that said communication channel is also available for transmitting voice signals.

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