Automatic Speech Recognition System

  • US 20090018828A1
  • Filed: 11/12/2004
  • Published: 01/15/2009
  • Est. Priority Date: 11/12/2003
  • Status: Abandoned Application
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First Claim
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1. An automatic speech recognition system, which recognizes speeches in acoustic signals detected by a plurality of microphones as character information, the system comprising:

  • a sound source localization module which localizes a sound direction corresponding to a specified speaker based on the acoustic signals detected by the plurality of microphones;

    a feature extractor which extracts features of speech signals contained in one or more pieces of information detected by the plurality of microphones;

    an acoustic model memory which stores direction-dependent acoustic models that are adjusted to a plurality of directions at intervals;

    an acoustic model composition module which composes an acoustic model adjusted to the sound direction, which is localized by the sound source localization module, based on the direction-dependent acoustic models in the acoustic model memory, the acoustic model composition module storing the acoustic model in the acoustic model memory; and

    a speech recognition module which recognizes the features extracted by the feature extractor as character information using the acoustic model composed by the acoustic model composition module.

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