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How does datacasting work?

April 26, 2017datacasting

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How does datacasting work?

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(A) The new DTV signal uses digital compression to carry video and audio data more efficiently than the analog signal we’re accustomed to. This efficiency enables us to insert data into the DTV signal, as well as audio and video. When DTV is used to carry data, it is called DTV datacasting. There are two types of DTV datacasting: dedicated bandwidth and opportunistic bandwidth. Dedicated bandwidth sets the encoding levels for audio and video such that there will always be a certain amount of space leftover within the DTV signal for data. With opportunistic datacasting, bits of data are packed into the unused portion of the DTV signal, filling space that would otherwise go unused.