Abstract
We build a single automatic speech recognition (ASR) model for several south Indian languages using a common set of intermediary labels, which can be easily mapped to the desired native script through simple lookup tables and a few rules. We use Sanskrit Library Phonetic encoding as the labeling scheme, which exploits the similarity in pronunciation across character sets of multiple Indian languages. Unlike the general approaches, which leverage common label sets only for multilingual acoustic modeling, we also explore multilingual language modeling. Our unified model improves the ASR performance in languages with limited amounts of speech data and also in out-of-domain test conditions. Also, the model performs reasonably well in languages with good representation in the training data.
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