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Impact of the Approaches Involved on Word-Graph Derivation from the ASR System

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Part of the Lecture Notes in Computer Science book series (LNIP,volume 6669)


Finding the most likely sequence of symbols given a sequence of observations is a classical pattern recognition problem. This problem is frequently approached by means of the Viterbi algorithm, which aims at finding the most likely sequence of states within a trellis given a sequence of observations. Viterbi algorithm is widely used within the automatic speech recognition (ASR) framework to find the expected sequence of words given the acoustic utterance in spite of providing a suboptimal result. Word-graphs (WGs) are also frequently provided as the ASR output as a means of obtaining alternative hypotheses, hopefully more accurate than the one provided by the Viterbi algorithm. The trouble is that WGs can grow up in a very computationally inefficient manner. The aim of this work is to fully describe a specific method, computationally affordable, for getting a WG given the input utterance. The paper focuses specifically on the underlying approaches and their influence on both the spatial cost and the performance.


  • Lattice
  • word-graphs
  • automatic speech recognition

This work has been partially funded by the Spanish Ministry of Science and Innovation under the Consolider Ingenio 2010 programme (MIPRCV CSD2007-00018) and SD-TEAM project (TIN2008-06856-C05-01); and by the Basque Government (under grant GIC10/158 IT375-10).

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Justo, R., Pérez, A., Torres, M.I. (2011). Impact of the Approaches Involved on Word-Graph Derivation from the ASR System. In: Vitrià, J., Sanches, J.M., Hernández, M. (eds) Pattern Recognition and Image Analysis. IbPRIA 2011. Lecture Notes in Computer Science, vol 6669. Springer, Berlin, Heidelberg.

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-21256-7

  • Online ISBN: 978-3-642-21257-4

  • eBook Packages: Computer ScienceComputer Science (R0)