A hierarchical broad-class classification to enhance phoneme recognition

Lopes, Carla, Alexandra Calado Lopes; Perdigão, Fernando

http://hdl.handle.net/10400.8/13035

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A hierarchical broad-class classification to enhance phoneme recognition.pdf	In this paper a hierarchical classification of different levels of phonetic information is proposed in order to improve phone recognition. In this paradigm several intermediate classifiers give posterior probability predictions for broad phonetic classes, achieving phone detail in the last layer. Class membership probabilities are weighted and combined in order to get a more robust phoneme prediction. A method for finding the best set of weights is also proposed based on discriminative training in a hybrid MLP/HMM system. Experiments show that the use of broad-class information enhances phone recognition. Relative improvements of 8% in Correctness and 5% in Accuracy were achieved in phoneme recognition on the TIMIT database compared to a baseline system.	627.59 KB	Adobe PDF	Download

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Authors

Lopes, Carla, Alexandra Calado Lopes

Perdigão, Fernando

Abstract(s)

In this paper a hierarchical classification of different levels of phonetic information is proposed in order to improve phone recognition. In this paradigm several intermediate classifiers give posterior probability predictions for broad phonetic classes, achieving phone detail in the last layer. Class membership probabilities are weighted and combined in order to get a more robust phoneme prediction. A method for finding the best set of weights is also proposed based on discriminative training in a hybrid MLP/HMM system. Experiments show that the use of broad-class information enhances phone recognition. Relative improvements of 8% in Correctness and 5% in Accuracy were achieved in phoneme recognition on the TIMIT database compared to a baseline system.

Description

17th European Signal Processing Conference, EUSIPCO 2009, 24 August 2009 through 28 August 2009 - Code 91099

Keywords

Hidden Markov models Abstracts Databases Engines

URI

http://hdl.handle.net/10400.8/13035

Citation

C. Lopes and F. Perdigão, "A hierarchical broad-class classification to enhance phoneme recognition," 2009 17th European Signal Processing Conference, Glasgow, UK, 2009, pp. 1760-1764.