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A review is given of the present state of basic functional units developed in France with the assistance of manufacturers to meet the needs of French AEC laboratories. These Renatran plug-in units are in accordance with the Esone standard. Plug-in units main characteristics and examples of classical experimental settings obtained in assembling various types of plug-in units are mentioned. In the same way, a transcription system towards printers, punching tape devices or computers has been studied and a brief description of it is given. The authors indicate their choice concerning the basic functions adopted in this case.

Our objective is the conception of an original wireless telemetry system to transmit high rate of EEG/SEEG signals in a hospital. At first, an experimental device is realized in order to characterize the indoor propagation at 2.45 GHz. We lay down the attenuation-distance law, quantify the fading and verify their statistics. In order to determine the impulse response, especially the delay spread, we simulate the correlation method. Then, we discuss the efficiency of space diversity, and the advantage of using directional antennas.