Abstract: A process for renegotiating, during a communication, the parameters of a traffic contract on an ATM network.The present invention relates to a renegotiation process, during a communication on an ATM network, of the parameters of the traffic contract that relates to this communication. It is characterized in that it consists:a. in predicting, for a predetermined period of time between two successive renegotiations, the maximal length that would be reached by a virtual file fed by the traffic of said communication, for at least a given thruput rate of said file.b. in deducing from said maximal length one or more new parameters for the traffic contract, andc. in renegotiating with the network on the basis of said (new) traffic parameter or parameters for said period of time.

Abstract: A analog-to-digital converter includes: an analog signal input, a reference voltage source, a portion for the combined processing of the analog signal and reference voltage, and a coding portion for supplying a digital output signal which is a function of the results of this processing. The processing portion includes at least one level of processing operators suitable for carrying out a non-linear calculation from their inputs; the coding portion include one level of output operators, each having as many inputs as there are outputs in the last level of operators in the processing portion. The transfer functions of the processing operators and output operators are chosen so as to allow an optimum analog-to-digital conversion over a given range of input signals.

Abstract: An analog parallel device for the local processing of a bidimensional signal comprises an input means, a processing means and an output means, the input means receiving the bidimensional signal and supplying, on a group of elementary input points organized in matrix-like manner, a group of parallel electrical input signals, the processing means receiving said input signals and supplying, on a group of elementary output points organized in matrix-like manner, a group of parallel electric output signals, each of which is obtained by a linear or non-linear combination of a plurality of input signals, the output means receiving said output signals, said means being realized in the form of thin films on a substrate.This device may be particularly applied to local image processing.