Humans are creating the transcriptions, and errors are prone to happening. Your experience is seeing a delay of 4-8 seconds. However it takes longer to determine the spoken words and then type these into a computer terminal. In addition to your reaction time, there is additional latency of your computer and the internet. The average reaction time of a human is is 215 milliseconds, according to the data collected so far. This captioning can only go as fast as a human can process information.

A stenographer listens to the broadcast and types the words into a special computer program that adds the captions to the television signal. The technical job title is a 'stenographer'.ĭuring a live broadcast of a special event or of a news program, captions appear just a few seconds behind the action to show what is being said. The studio transcriber's job is to listen to the live video feed and as quickly and accurately as possible type the transcription into a computer terminal which appends the closed captioning directly into the Television Signal. Live TV traditionally required a human in a TV studio to transcribe spoken voice and sounds on TV.

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