Electronic control circuit and acoustic-signal emitting...

B - Operations – Transporting – 06 – B

Patent

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B06B 1/02 (2006.01) G10K 15/02 (2006.01)

Patent

CA 2487958

An electronic control circuit (50)of a loudspeaker (LDSK) for vehicles, for emitting at least a first acoustic signal characteristic of an alarm siren is characterized in that it comprises: storage means (Flash) for storing a plurality of digital samples representative of at least a portion of a reference acoustic signal which can be generated by a sample acoustic warning device, processing means (~P) for generating, on the basis of the plurality of samples, a modulated electrical signal (S1, S2) carrying at least a portion of the harmonic content associated with the reference acoustic signal, and a driver circuit (DRV-CR) for receiving the modulated electrical signal (S1; S2) and supplying to the loudspeaker (LDSK) a corresponding driving signal for the emission of a second acoustic signal substantially reproducing the at least one portion of the reference acoustic signal.

L'invention concerne un circuit de commande électronique (50) d'un haut-parleur (LDSK) pour des véhicules; lequel circuit de commande permet d'émettre au moins une première caractéristique de signal acoustique d'une sirène d'alarme. Le circuit de commande électronique se caractérise par: un moyen de stockage (Flash) conçu pour permettre le stockage d'une multitude d'échantillons numériques représentant au moins une partie d'un signal acoustique de référence qui peut être généré par un dispositif d'alarme sonore échantillon; un moyen de traitement (µP) conçu pour générer, en fonction des multiples échantillons, un signal électrique modulé (S1, S2) comportant au moins une partie du contenu harmonique associé au signal acoustique de référence; et un circuit pilote (DRV-CR) conçu pour recevoir le signal électrique modulé (S1, S2) et pour fournir au haut-parleur (LDSK) une impulsion de synchronisation afin de permettre l'émission d'un second signal acoustique reproduisant essentiellement ladite partie du signal acoustique de référence.

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