When, at the 1981 Berlin Radio and TV Exhibition, the ITT Intermetall companies exhibited to the public for the first time a digital television VLSI concept [1], [2], opinions among experts were by no means unanimously favorable. Today, after 26 years, more than 70million TV sets worldwide have already been equipped with this system. Today, the intensive use of VLSI chips does not need a particular justification, the main reasons being increased reliability mainly because of the long-term stability of the color reproduction brought about by digital systems, and medium and long-term cost advantages in manufacturing which are essential for ensuring international competitiveness.
Digital signal processing permits solutions that guarantee a high degree of compatibility with future developments, whether in terms of quality improvements or new features like intermediate picture storage or adaptive comb filtering for example. In addition to these benefits, a digital system offers a number of advantages with regard to the production of TV sets:
1. Digital circuits are tolerance-free and are not subject to drift or aging phenomena. & even permit fully automated, computer-controlled tuning.
2. Digital components can be programmable. This means that the level of user convenience and the features offered by the set can be tailored to the manufacturer's individual requirements via the software.
3. Modular construction means that set assembly can be fully automated as well. Together with automatic tuning, the production process can be greatly simplified and accelerated.
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