Vehicle classification system using a passive audio input to...

G - Physics – 01 – V

Patent

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G01V 1/00 (2006.01) G01H 3/08 (2006.01)

Patent

CA 2187885

A system and method for classifying vehicles based on the sound waves produced by the vehicles are disclosed. Analog sound pressure levels are input into the system and converted to digital sound pressure levels by an analog to digital converter (22). A spectral analyzer (24) converts the digital sound pressure levels into a power spectrum. Fuzzification functions are applied to the power spectrum by a dimension reducer (26) to produce a characterizing vector that characterizes the power spectrum. A neural network (28) then classifies the vehicle based on the characterizing vector.

Système et procédé permettant de classifier des véhicules en fonction des ondes sonores produites par lesdits véhicules. Des niveaux de pression acoustique analogiques sont entrées dans le système et convertis en niveaux de pression acoustique numériques par un convertisseur analogique/numérique (22). Un analyseur spectral (24) convertit les niveaux de pression acoustique numériques en un spectre de puissances. Des fonctions de modification logique floue sont appliquées au spectre de puissances par un réducteur (26) de dimensions pour produire un vecteur de caractérisation qui caractérise le spectre de puissances. Un réseau neuronal (28) classifie ensuite les véhicules en fonction du vecteur de caractérisation.

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