The invention relates to an analog and digital processing method which samples signals provided by two piezoelectric method C1 and C2, making it possible to determine several speeds of a vehicle per axle. The emitter area is electrically connected to an emitter contact of the bipolar transistor. The normalization section employs the tf\xb7idf method. The switch address generator outputs a switch address, which is an address for a first instruction for a selected-context instruction module.