EVALUATION ON SWITCHBOARD

• Evaluation task
  • Lattice rescoring on WS'97 development test set

  • Cross-word decoding

• Evaluation data
  • Test data - 1.56 hours of speech in 2427 utterances

  • Training for acoustic models - 60 hours of speech

  • 22K words lexicon

  • Bigram lattices with inherent WER around 10%

  • 12 mixture Gaussians, 39 features, 3 state HMMs

  • Acoustic models and lattices generated by HTK

• Baseline system
  • HVite - decoder used in HTK