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Method and system for masking speech

  • US 7,505,898 B2
  • Filed: 07/11/2006
  • Issued: 03/17/2009
  • Est. Priority Date: 07/24/2002
  • Status: Expired due to Fees
First Claim
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1. A method of masking a speech stream, comprising the steps of:

  • obtaining a speech signal representing said speech stream;

    modifying said speech signal to create an obfuscated speech signal, wherein said obfuscated speech signal is speech-like; and

    combining said speech signal and said obfuscated speech signal to produce a combined speech signal, wherein said combined speech signal is realized electronically; and

    wherein said combined speech signal represents a combined speech stream that is speech-like yet substantially unintelligible;

    said modifying step further comprising the steps of;

    temporally partitioning said speech signal into a plurality of variable length segments, each of said segments having a length determined by features of said speech signal, said segments occurring in an initial order within said speech signal;

    selecting a plurality of selected segments from among said segments; and

    assembling said selected segments, in an order different than said initial order, to produce said obfuscated speech signal.

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