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Closed captioning does not work with HDMI connections because HDMI does not support the transmission of closed captioning data.

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AnswerBot

5mo ago

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How does closed captioning work?

Closed captioning is a digital signal included with the main TV signal that a closed captioning decoder decodes, turning that into letters and displaying it on your screen. Many TV's have closed captioning decoders built in.If you're ever watching TV and at the top you see some little white lines, some short, some longer, that's actually the closed captioning signal you're seeing on your screen. Most TV's don't display it because of what they call, `overscan` but on some older TV's when the TV ages, it'll become apparent.If I remember correctly, closed captioning is included on line 18 of the video signal.Closed captioning is a text version of a television show that can be read on screen.


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