arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2104.10328eess.AScs.LGcs.SD
收藏

基于前后向Transformers的ASR标签同步语音文本对齐

Label-Synchronous Speech-to-Text Alignment for ASR Using Forward and Backward Transformers

LINE Corporation(LINE公司)

Yusuke Kida, Tatsuya Komatsu, Masahito Togami

摘要:

本文提出了一种新的标签同步语音到文本对齐技术的自动语音识别(ASR)。语音到文本对齐是将具有未对齐的转录本的长音频记录分割成语音和文本的话语对的问题。与传统的基于帧同步预测的方法不同,该方法将语音到文本对齐重新定义为标签同步文本映射问题。这使得能够实现准确的对齐,受益于最先进的基于注意力的编码器-解码器模型的强推理能力,这不能应用于传统方法。两种不同的Transformer模型,即前向Transformer和后向Transformer,分别用于基于教师强迫的句尾预测来估计给定语音段的初始和最终标记。使用语料库的自发日语(CSJ)的实验表明,所提出的方法提供了一个准确的话语明智的对齐,匹配手动注释对齐的误差只有0.2%。实验结果表明,基于Transformer的CTC/Attention ASR混合模型将对齐后的语音和文本对作为额外的训练数据,可以将字符错误率降低到59.0%,明显优于基于连接主义时间分类模型的传统对齐方法的39.0%。

英文摘要:

This paper proposes a novel label-synchronous speech-to-text alignment technique for automatic speech recognition (ASR). The speech-to-text alignment is a problem of splitting long audio recordings with un-aligned transcripts into utterance-wise pairs of speech and text. Unlike conventional methods based on frame-synchronous prediction, the proposed method re-defines the speech-to-text alignment as a label-synchronous text mapping problem. This enables an accurate alignment benefiting from the strong inference ability of the state-of-the-art attention-based encoder-decoder models, which cannot be applied to the conventional methods. Two different Transformer models named forward Transformer and backward Transformer are respectively used for estimating an initial and final tokens of a given speech segment based on end-of-sentence prediction with teacher-forcing. Experiments using the corpus of spontaneous Japanese (CSJ) demonstrate that the proposed method provides an accurate utterance-wise alignment, that matches the manually annotated alignment with as few as 0.2% errors. It is also confirmed that a Transformer-based hybrid CTC/Attention ASR model using the aligned speech and text pairs as an additional training data reduces character error rates relatively up to 59.0%, which is significantly better than 39.0% reduction by a conventional alignment method based on connectionist temporal classification model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑