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Method and system for preventing speech comprehension by interactive voice response systems

  • US 7,979,274 B2
  • Filed: 05/20/2009
  • Issued: 07/12/2011
  • Est. Priority Date: 10/01/2004
  • Status: Expired due to Fees
First Claim
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1. A method of modifying a speech signal for reducing the likelihood for recognition of the speech signal by a speech recognition system, the method comprising:

  • receiving at least one prosody sample; and

    modifying at least one prosody characteristic of an initial speech signal based on the at least one prosody sample, thereby generating a modified speech signal, the modified speech signal being less likely to be recognized by a speech recognition system than the initial speech signal, wherein the modified speech signal is further altered by;

    (a) obtaining an acceptable frequency range;

    (b) calculating a random frequency signal;

    (c) comparing the random frequency signal to the acceptable frequency range;

    (d) repeating steps (b) and (c) in response to the calculated random frequency signal not being within the acceptable frequency range; and

    (e) overlaying the random frequency signal onto the modified speech signal in response to the random frequency signal being within the acceptable frequency range.

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