| 摘要 |
<p>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.</p> |
