Soft indexing of speech content for search in spoken documents

  title={Soft indexing of speech content for search in spoken documents},
  author={Ciprian Chelba and Jorge F. Silva and Alex Acero},
  journal={Computer Speech & Language},
The paper presents the Position Specific Posterior Lattice (PSPL), a novel lossy representation of automatic speech recognition lattices that naturally lends itself to efficient indexing and subsequent relevance ranking of spoken documents. This technique explicitly takes into consideration the content uncertainty by means of using soft-hits. Indexing position information allows one to approximate N-gram expected counts and at the same time use more general proximity features in the relevance… CONTINUE READING
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