Cumulative Adaptation for BLSTM Acoustic Models

Markus Kitza, Pavel Golik, Ralf Schlüter, Hermann Ney
<span title="2019-09-15">2019</span> <i title="ISCA"> <a target="_blank" rel="noopener" href="" style="color: black;">Interspeech 2019</a> </i> &nbsp;
This paper addresses the robust speech recognition problem as an adaptation task. Specifically, we investigate the cumulative application of adaptation methods. A bidirectional Long Short-Term Memory (BLSTM) based neural network, capable of learning temporal relationships and translation invariant representations, is used for robust acoustic modeling. Further, ivectors were used as an input to the neural network to perform instantaneous speaker and environment adaptation, providing 8% relative
more &raquo; ... mprovement in word error rate on the NIST Hub5 2000 evaluation testset. By enhancing the first-pass i-vector based adaptation with a second-pass adaptation using speaker and environment dependent transformations within the network, a further relative improvement of 5% in word error rate was achieved. We have reevaluated the features used to estimate ivectors and their normalization to achieve the best performance in a modern large scale automatic speech recognition system.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="">doi:10.21437/interspeech.2019-2162</a> <a target="_blank" rel="external noopener" href="">dblp:conf/interspeech/KitzaGSN19</a> <a target="_blank" rel="external noopener" href="">fatcat:xmtnbche35grxnx7kmdoftwndu</a> </span>
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