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Spectral feature mapping with mimic loss for robust speech recognition

Citation Author(s):
Peter Plantinga, Adam Stiff, Eric Fosler-Lussier
Submitted by:
Deblin Bagchi
Last updated:
16 April 2018 - 3:17am
Document Type:
Poster
Document Year:
2018
Event:
Presenters:
Deblin Bagchi
Paper Code:
3472
 

For the task of speech enhancement, local learning objectives are agnostic to phonetic structures helpful for speech recognition. We propose to add a global criterion to ensure de-noised speech is useful for downstream tasks like ASR. We first train a spectral classifier on clean speech to predict senone labels. Then, the spectral classifier is joined with our speech enhancer as a noisy speech recognizer. This model is taught to imitate the output of the spectral classifier alone on clean speech. This \textit{mimic loss} is combined with the traditional local criterion to train the speech enhancer to produce de-noised speech. Feeding the de-noised speech to an off-the-shelf Kaldi training recipe for the CHiME-2 corpus shows significant improvements in WER.

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