发明名称 |
Method and device for attenuating the noise generated at the outlet of an exhaust line |
摘要 |
A method for attenuating the low-frequency noise generated at the outlet (18) of an exhaust line (14). 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), the first acoustic wave having a carrier frequency higher than 50 kHz; and a second high-frequency acoustic wave (F1+&Dgr;fcb) is emitted by a second transducer (24) into the attenuation region (26) of the exhaust line, the second acoustic wave having the carrier frequency of the first high-frequency acoustic wave (F1) and containing a low-frequency counter-noise signal (&Dgr;fcb) which is out of phase with the signal representing the noise to be attenuated.
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申请公布号 |
US7711124(B2) |
申请公布日期 |
2010.05.04 |
申请号 |
US20040559934 |
申请日期 |
2004.06.09 |
申请人 |
FAURECIA SYSTEMES D'ECHAPPEMENT |
发明人 |
GARABEDIAN CHRISTIAN |
分类号 |
G10K11/16;E04F17/04;F01N1/06;F01N13/08;F02K1/00;F41A21/00;H04B15/00;H04R29/00 |
主分类号 |
G10K11/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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