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Fully Convolutional Speech Recognition
Fully Convolutional Speech Recognition
Neil Zeghidour extsuperscript1,2,* Qiantong Xu extsuperscript1,* Vitaliy Liptchinsky extsuperscript1 Nicolas Usunier extsuperscript1 Gabriel Synnaeve extsuperscript1 Ronan Collobert extsuperscript1
Abstract
Current state-of-the-art speech recognition systems build on recurrent neural networks for acoustic and/or language modeling, and rely on feature extraction pipelines to extract mel-filterbanks or cepstral coefficients. In this paper we present an alternative approach based solely on convolutional neural networks, leveraging recent advances in acoustic models from the raw waveform and language modeling. This fully convolutional approach is trained end-to-end to predict characters from the raw waveform, removing the feature extraction step altogether. An external convolutional language model is used to decode words. On Wall Street Journal, our model matches the current state-of-the-art. On Librispeech, we report state-of-the-art performance among end-to-end models, including Deep Speech 2 trained with 12 times more acoustic data and significantly more linguistic data.