This paper proposes a novel unsupervised autoregressive neural model for learning generic speech representations. In contrast to other speech representation learning methods that aim to remove noise or speaker variabilities, ours is designed to preserve information for a wide range of downstream tasks. In addition, the proposed model does not require any phonetic or word boundary labels, allowing the model to benefit from large quantities of unlabeled data. Speech representations learned by our model significantly improve performance on both phone classification and speaker verification over the surface features and other supervised and unsupervised approaches. Further analysis shows that different levels of speech information are captured by our model at different layers. In particular, the lower layers tend to be more discriminative for speakers, while the upper layers provide more phonetic content.

本文提出了一种新颖的无监督自回归神经模型，用于学习通用的语音表示，通过无需音素或单词边界标签的方法，从大量未标记数据中学习。我们的模型的语音表示显著提高了电话分类和说话人验证的性能，并且我们的分析表明，不同级别的语音信息由我们的模型在不同层次上捕获。

无监督自回归模型用于语音表示学习