音声認識
Communication access real-time translation (CART) stenographers, who use a computer with using either stenotype or Velotype keyboards to transcribe stenographic input for presentation as captions within two or three seconds of the representing audio, must caption anything which is purely live and unscripted; however, more recent developments include operators using speech recognition software and re-voicing the dialogue. Speech recognition technology has advanced so quickly in the United States that about 50% of all live captioning was through speech recognition as of 2005. Real-time captions look different from offline captions, as they are presented as a continuous flow of text as people speak.