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Originally Posted by Ref Ump Welsch
Live closed captioning always has some lag time, because the person has to hear the dialogue and then type it. It's very similar to court reporting, equipment-wise. The only time closed captioning doesn't have lag time is on pre-recorded shows or movies, when the captioner has access to the script. Even then, the captioning doesn't show all the words from the dialogue whereas in live captioning, the poor soul is trying to type EVERY word.
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Most newscasts are closed captioned via the written scripts fed to the anchors via the teleprompter.