Unsupervised speech representation learning has shown remarkable success at finding representations that correlate with phonetic structures and improve downstream speech recognition performance. However, most research has been focused on evaluating the representations in terms of their ability to improve the performance of speech recognition systems on read English (e.g. Wall Street Journal and LibriSpeech). This evaluation methodology overlooks two important desiderata that speech representations should have: robustness to domain shifts and transferability to other languages. In this paper we learn representations from up to 8000 hours of diverse and noisy speech data and evaluate the representations by looking at their robustness to domain shifts and their ability to improve recognition performance in many languages. We find that our representations confer significant robustness advantages to the resulting recognition systems: we see significant improvements in out-of-domain transfer relative to baseline feature sets and the features likewise provide improvements in 25 phonetically diverse languages including tonal languages and low-resource languages.

本文旨在研究无监督语音表示学习在具备鲁棒性和可迁移性方面的表现，通过使用多样性和嘈杂的语音数据学习表示，并在多个语言中验证其鲁棒性和可迁移性。结果显示，该方法相比基线特征集在跨域转移和25种不同语言的语音识别上均有显著提升。

学习稳健且多语言的语音表征