Electricite De France

Service National Electricite De France

Jean-Francois Hamelin

Michel Combe

Driss Anouar

To analyze and restore an analog signal by sampling at a frequency between 2.5 and five times the band of the signal and by interpolation, the signals sampled at the rate (F.sub.e) is subjected to low pass filtering for isolating the signal band B, then to an interpolation in several steps each leading to multiplication of the samples by inserting zeros between the available samples and by subjecting the new set of samples obtained to digital low pass filtering. The installation for this may comprise an input filter, an A/D converter and an interpolater. The filter isolates the band of the signal then the interpolater operates in several steps each leading to multiplication of the samples by inserting zeros between the available samples and by subjecting the new set of samples obtained to digital low pass filtering.

Process and installation for the analysis and retrieval of a sampling

The transmission of digital data takes place over a network comprising a data transmission line and a control and synchronizing line connecting together a master station, alone capable of transmitting over the control line, and several slave stations. The two lines are unidirectional and looped back to the master station and the stations transmit information in phase over the two lines. For that, each slave station comprises means for extracting clock information from the signal permanently present on the control line.

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Chatou, France

Jean-Francois Hamelin