| 摘要 |
The invention relates to a method for attenuating the low-frequency noise generated at the outlet (18) of an exhaust line (14). According to said method: a signal representing the noise to be attenuated is defined; a first high-frequency acoustic wave (F1) is emitted from a first transducer (22) into an attenuation region (26) of the exhaust line (14), said first acoustic wave having a carrier frequency higher than 50 kHz; and a second high-frequency acoustic wave (F1 + DeltaFCB) is emitted by a second transducer (24) into the attenuation region (26) of the exhaust line, said second acoustic wave having the carrier frequency of the first high-frequency acoustic wave (F1) and containing a low-frequency counter-noise signal (DeltaFCB) which is out of phase with the signal representing the noise to be attenuated.
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