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A preliminary study on improving the recognition of esophageal speech using a hybrid system based on statistical voice conversion

Abstract : In this paper, we propose a hybrid system based on a modified statistical GMM voice conversion algorithm for improving the recognition of esophageal speech. This hybrid system aims to compensate for the distorted information present in the esophageal acoustic features by using a voice conversion method. The esophageal speech is converted into a “target” laryngeal speech using an iterative statistical estimation of a transformation function. We did not apply a speech synthesizer for reconstructing the converted speech signal, given that the converted Mel cepstral vectors are used directly as input of our speech recognition system. Furthermore the feature vectors are linearly transformed by the HLDA (heteroscedastic linear discriminant analysis) method to reduce their size in a smaller space having good discriminative properties. The experimental results demonstrate that our proposed system provides an improvement of the phone recognition accuracy with an absolute increase of 3.40 % when compared with the phone recognition accuracy obtained with neither HLDA nor voice conversion.
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https://hal.inria.fr/hal-01221503
Contributor : Joseph Di Martino <>
Submitted on : Wednesday, October 28, 2015 - 10:52:47 AM
Last modification on : Tuesday, December 18, 2018 - 4:38:02 PM

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Othman Lachhab, Joseph Di Martino, El Hassane Ibn Elhaj, Ahmed Hammouch. A preliminary study on improving the recognition of esophageal speech using a hybrid system based on statistical voice conversion. SpringerPlus, SpringerOpen, 2015, ⟨10.1186/s40064-015-1428-2⟩. ⟨hal-01221503⟩

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