INTERACTIVE TELEVISION
The future of Television is undoubtedly digital. Television of video signals can be converted from their normal analogue form (continuously varying) into a digital form, which consists of a series of definite pulses rather like Morse code.
Digital signals can be transmitted , compressed and manipulated by computers without any unwanted 'noise' affecting data. One of the advantages of digital technology is that video data can be manipulated to make interactive television possible.
Interactive 'video on demand (VOD) services allow users to watch the material of their choice from a large central video vault. A digital server enables many users to watch the same film, starting at different times, by sending the video data in small "packets" to them.
Other services include news programmes, games, music and electronic shopping. With the latter, the user 'strolls' through a virtual shop and uses a credit card to buy items, which are then delivered to the home within days.
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