System and method of lattice-based search for spoken utterance retrieval

  • US 7,912,699 B1
  • Filed: 08/23/2004
  • Issued: 03/22/2011
  • Est. Priority Date: 08/23/2004
  • Status: Active Grant
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First Claim
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1. A method of retrieving a spoken document, the method being performed by a computing device, the method comprising:

  • converting via a processor high word error rate speech from the spoken document into a lattice representation related to a recognition network represented as weighted finite state machines, the spoken document generated from a telephone call;

    indexing via the processor the lattice representation of speech based on phones;

    upon receiving a query from a user;

    converting each query word into phone strings based on the query word pronunciation;

    searching the phone-based index of the lattice representation of speech for each phone string of the phone strings having a minimum pronunciation length;

    searching the indexed lattice representation of speech; and

    returning audio segments from the spoken document that match the user query.

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