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Showing posts from October, 2019

Speech recognition in Hangouts Meet

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There are many possible applications for speech recognition in Real Time Communication services live captions, simultaneous translation, voice commands or storing/summarising audio conversations.

Speech recognition in the form of live captioning has been available in Hangouts Meet for some months but recently it was promoted to a button in the main UI and I have started to use it almost every day.


I'm mostly interested in the recognition technology and specifically on how to integrate DeepSpeech in RTC media servers to provide a cost effective solution but in this post I wanted to spend some time analysing how Hangouts Meet implemented captioning from a signalling point of view.

At a very high level there are at least three possible architectures for speech recognition in RTC services: