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Here is a paper that audio and video for speech recognition, and they find that video helps especially in noisy environments. https://www.uni-ulm.de/fileadmin/

• mabbo 11y ago
  Awesome! Noisy environments are exactly when seeing the lips is a huge deal for me. I have a friend who has a tendency to absent-mindedly place his hand in front of his mouth. In a quiet office or home, no issue. In a bar? He pressed mute, as far as I'm concerned.