![]() LanguagesĦ08 closed captions only support the display of regular Latin language characters in languages such as English, Spanish, and French. ![]() It has two fields – usually, English captions are transmitted in the first field and Spanish captions are transmitted in the second field. Line 21 itself is not viewable on television or videos, but the hidden data is decoded to make captions appear overlayed on a video stream. This is a transmission data stream that carries closed captions as well as V-Chip data (which provides the small TV rating you see in the top corner of the screen based on violence, language, and more.) TransmissionĦ08 closed captions are transmitted via Line 21 captioning data. ![]() AppearanceĦ08 captions are most recognizable for their stereotypical closed caption appearance: white text over a black box.Ħ08 closed captions usually have the classic appearance as depicted in this example. However, 608 captions do not support any of the appearance or customization options offered by 708 captions. 608 captions are compatible with digital television via picture user data, which was meant to make the transition from analog easier. What are 608 Closed Captions?Ħ08 closed captions (also known as CEA-608, EIA-608, or Line 21 captions) were the standard for analog television. And while this support was intended for transitional purposes, 608 closed captions continue to be widely used in digital televisions today. In an effort to make the transition from 608 to 708 closed captioning smoother, digital television maintained the ability to support 608 captions. At the time, it was expected that 608 captions would transition to 708 captions, so 708 closed captions subsequently became the preferable standard by the FCC for all digital television. In 2009, the DTV Delay Act was passed in the United States, officially replacing analog television with digital television. But if 608 is “old” and 708 is “new”, why are we talking about both? Wouldn’t that mean everyone should be using 708 closed captions by this point? Not necessarily. These may also be referred to as EIA-608 and EIA-708, Line 21, CEA-708, or simply just 608 and 708 closed captions.Ħ08 closed captions were the old captioning standard for analog television, while 708 closed captions are the new captioning standard for modern digital television. This has resulted in two main standards for encryption and decryption of closed captioning data based on Federal Communications Commission (FCC) regulations: CEA-608 and CTA-708. Over the years, decoding has evolved alongside television as technology has shifted from analog to digital. When closed captions appear on your television screen, a decoder inside the TV translates raw data from a broadcast location and displays it as text that is understandable to the human eye.
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