  While speech recognition Word Error Rate (WER) has reached human parity for
English, continuous speech recognition scenarios such as voice typing and
meeting transcriptions still suffer from segmentation and punctuation problems,
resulting from irregular pausing patterns or slow speakers. Transformer
sequence tagging models are effective at capturing long bi-directional context,
which is crucial for automatic punctuation. Automatic Speech Recognition (ASR)
production systems, however, are constrained by real-time requirements, making
it hard to incorporate the right context when making punctuation decisions.
Context within the segments produced by ASR decoders can be helpful but
limiting in overall punctuation performance for a continuous speech session. In
this paper, we propose a streaming approach for punctuation or re-punctuation
of ASR output using dynamic decoding windows and measure its impact on
punctuation and segmentation accuracy across scenarios. The new system tackles
over-segmentation issues, improving segmentation F0.5-score by 13.9%. Streaming
punctuation achieves an average BLEUscore improvement of 0.66 for the
downstream task of Machine Translation (MT).

Computation and Language