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System and Method for Recognizing Speech Securely

  • US 20080172233A1
  • Filed: 01/16/2007
  • Published: 07/17/2008
  • Est. Priority Date: 01/16/2007
  • Status: Active Grant
First Claim
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1. A system for recognizing speech securely, comprising:

  • a client configured to provide securely speech in a form of an observation sequence of symbols;

    a server configured to provide securely a plurality of trained hidden Markov models (HMMs), each trained HMM including a plurality of states, a state transition probability distribution and an initial state distribution, and each state including a subset of the observation symbols and an observation symbol probability distribution, and in which the observation symbol probability distributions are modeled by mixtures of Gaussian distributions;

    means to determine securely, for each HMM, a likelihood the observation sequence is produced by the states of the HMM; and

    means to determine securely a particular symbol with a maximum likelihood of a particular subset of the symbols corresponding to the speech,

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