Transformer-based models have demonstrated their effectiveness in automatic speech recognition (ASR) tasks and even shown superior performance over the conventional hybrid framework. The main idea of Transformers is to capture the long-range global context within an utterance by self-attention layers. However, for scenarios like conversational speech, such utterance-level modeling will neglect contextual dependencies that span across utterances. In this paper, we propose to explicitly model the inter-sentential information in a Transformer based end-to-end architecture for conversational speech recognition. Specifically, for the encoder network, we capture the contexts of previous speech and incorporate such historic information into current input by a context-aware residual attention mechanism. For the decoder, the prediction of current utterance is also conditioned on the historic linguistic information through a conditional decoder framework. We show the effectiveness of our proposed method on several open-source dialogue corpora and the proposed method consistently improved the performance from the utterance-level Transformer-based ASR models.

本文提出了一种基于Transformer的端到端架构方法，在自动语音识别中精确建模跨话语的语境依赖，通过引入上下文感知残余注意机制，对先前语音的上下文进行编码，同时，还采用条件解码器框架将历史语言信息融入到当前预测中，结果表明该方法在几种公开对话语料库上都取得了持续的改进

基于句间注意力机制改进基于 Transformer 的对话语音识别