digital television
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AI overview
Digital television transmits pictures and sound using digital signals that are processed and combined together, rather than the analog signals used by older TV systems. This technology matters because it allows for better picture and sound quality, more efficient use of broadcast space, and the ability to transmit additional information alongside the video and audio.
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Article
A map depicting digital terrestrial television standards
Digital television (DTV) is the transmission of television signals using digital encoding, in contrast to the earlier analog television technology which used analog signals. In the 2000s it was represented as the first major evolution in television technology since color television in the 1950s. Modern digital television is transmitted in high-definition television (HDTV) formats with greater resolution than analog TV. It typically uses a widescreen aspect ratio (commonly 16:9) in contrast to the narrower format (4:3) of analog TV. It makes more economical use of scarce radio spectrum space; it can transmit numerous digital channels in the same bandwidth as a single analog channel, and provides many new features that analog television cannot. While digital satellite and cable TV deployments began in the 1990s, using standard definition television resolutions (digital SDTV), over-the-air digital TV began transitioning from analog to digital broadcasting in the late 1990s, primarily using high definition telvision formats (digital HDTV). Different digital television broadcasting standards have been adopted in different parts of the world; below are the more widely used standards: