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Segment-Based Acoustic Models With Multi-level Search Algorithms For Continuous Speech Recognition.pdf

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Preview of Segment-Based Acoustic Models with Multi-level Search Algorithms for Continuous Speech Recognition
🔗 Source: aclanthology.org
📊 Size: 92 KB
👤 Author: Marl Ostendorf; J. Robin Rohlicek
⬇️ Downloads: 50

Summary

Developed robust context modeling for stochastic segment models using tied covariance distributions, reducing error rate by a factor of two on the RM Oct 89 test set. Improved the BBN-ItMM/BU-SSM combined system to 3.3% word error. Determined that linear models have predictive power similar to non-linear models of cepstra within segments. Evaluated the dynamical system model in phoneme recognition, outperforming the independent-frame model on the TIMIT corpus. Reformulated the recognition problem as a classification and segmentation scoring problem, allowing more general types of classifiers and non-traditional feature analysis. Demonstrated that for equivalent feature sets and context-independent models, the two methods give similar results. Investigated duration models conditioned on speaking rate and pre-pause location, improving performance by increasing the weight of duration. Analyzed the behavior of recognition error over the weight space for HMM and SSM scores in the N-best rescoring paradigm, addressing the problem of local optima with a grid-based search. Discovered a significant mismatch problem between training and test data. Extended Bayesian techniques for speaker adaptation, achieving a 16% reduction in error using 3 minutes of speech with simple mean adaptation techniques. Developed a multi-level stochastic model of speech that can take advantage of multi-rate signal analysis, evaluating the model for the two-level case with cepstral features and showing improved performance over a single-level model.

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Description

Ostendorf and Rohlicek (Boston U, BBN) aim to enhance speaker-independent continuous speech recognition via stochastic, segment-based acoustic models and efficient, multi-level search algorithms, funded by DARPA and NSF.

Technical Information

  • File Format: PDF
  • File Size: 92 KB
  • Pages: 1
  • Language: EN
  • Author: Marl Ostendorf; J. Robin Rohlicek
  • Total Downloads: 50
  • Last Updated: 2 hours ago

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Segment-Based guideSegment-Based tutorialAcoustic guideAcoustic tutorialModels guideModels tutorialwith guidewith tutorialMulti-level guideMulti-level tutorialSearch guideSearch tutorialAlgorithms guideAlgorithms tutorialContinuous guideContinuous tutorialSpeech guideSpeech tutorialRecognition guideRecognition tutorial

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