Laboratoire Europeen De Recherches Electroniques Avancees Societe En Nom

Laboratoire Europeen De Recherches Electroniques Appliquees Societe En

Albert Dorner

Joel Hamon

Eric Diehl

Michel Leduc

Jacky Mahler

The process of the invention concerns pay television networks with reinforced scrambling. To attract potential subscribers, the invention consists in cyclically transmitting non-scrambled images for brief periods, so that the type of program can be seen.

Process for promotion of pay television broadcasts, and device for use

Disclosed is an apparatus for the reception of video signals with a variable gain amplifier to hold the video signal between pre-determined limits. To control the gain of the amplifier, there is provision for a circuit that keeps the amplitude of the line synchronization pulse substantially constant. This circuit has, for example, an analog/digital converter with an output, one bit of which represents the sign of the difference between the line synchronization pulse and its prescribed value.

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Strasbourg, France

Albert Dorner