The box then decodes the data, decompresses the video, and converts it into a format the television screen can display. High-speed scanners, known as analog-to-digital converters, sample the image and sound thousands of times per second.
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Here, the analog video and audio signals undergo a process called digitization. Viewers can participate in polls, access video-on-demand libraries, or even browse the internet, turning the television into a connected hub.
Modern televisions contain a digital tuner, but many older models require an external device to bridge the gap. Furthermore, multiplexing allows multiple television channels to be combined into a single data stream.
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This metadata includes electronic program guides (EPGs), which provide schedules and descriptions for upcoming shows. The receiver must then reverse this process, separating the individual channels and extracting the correct one for the viewer to watch.
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