This happens at the transmission headend, where the video, audio, and ancillary data are packaged together efficiently. Instead of continuous waveforms encoding audio and video, modern systems convert this information into compressed data packets.
How Digital Television Compression Works: Encoding, Compression, and Delivery
These methods encode the data onto a specific frequency suitable for transmission, whether it is a radio wave or a cable signal. The box then decodes the data, decompresses the video, and converts it into a format the television screen can display.
The Function of the Conditional Access System For subscription-based services, the set-top box performs a critical security function. This raw digital data is too large for efficient transmission, so sophisticated compression algorithms are immediately applied to shrink the file size without significant loss of quality.
How Digital Television Compression Packs and Shrinks Video Data
Alternatively, cable television infrastructure uses a network of fiber optic and coaxial cables to deliver the signal directly to homes. This external device is the set-top box, which acts as a dedicated translator.
More About How does digital television work
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