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An investigation of likelihood normalization for robust ASR

Abstract : Noise-robust automatic speech recognition (ASR) systems rely on feature and/or model compensation. Existing compensation techniques typically operate on the features or on the parameters of the acoustic models themselves. By contrast, a number of normalization techniques have been defined in the field of speaker verification that operate on the resulting log-likelihood scores. In this paper, we provide a theoretical motivation for likelihood normalization due to the so-called "hubness" phenomenon and we evaluate the benefit of several normalization techniques on ASR accuracy for the 2nd CHiME Challenge task. We show that symmetric normalization (S-norm) reduces the relative error rate by 43% alone and by 10% after feature and model compensation.
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Submitted on : Friday, June 13, 2014 - 9:17:46 PM
Last modification on : Friday, May 6, 2022 - 4:26:02 PM
Long-term archiving on: : Saturday, September 13, 2014 - 11:40:29 AM


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  • HAL Id : hal-01006142, version 1


Emmanuel Vincent, Aggelos Gkiokas, Dominik Schnitzer, Arthur Flexer. An investigation of likelihood normalization for robust ASR. Interspeech, Sep 2014, Singapore, Singapore. ⟨hal-01006142⟩



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