THE DIFFERENT TELEVISioN STANDARDS CONSIDERED FROM THE _POINT OF VIEW OF RECEIVER DESIGN

The diversity of European television standards has been referred to more than once in this Review. From. the point of view of th~se concerned with T. V. transmission, the most important consequence of this lack of uniformity is that it necessitates the use of "line converters" in any international exchange of programmes. The receiver designer, on the other hand, is concerned with the demand created in certain regions for sets àble to operate in accordance with two or more different standards. Examples of such regions are the Saar, the districts along the Franco-German border, and, above all, Belgium. In Belgium two different standards are employed, one for Walloon, and one for Flemish transmissions; moreover, both these standards differ from those of the surrounding countries, i;e. France on the one side and Holland and Germany on the other. As an introduetion to an article on afour-standard receiver specially designed for Belgium, to be published in due course, the different regional standards and a number of associated problems will now be discussed.