| 摘要 |
The device has a tubular intake pipe (2) with intake (20) for ambient air, an air filter (4) downstream in the intake pipe, and an air filter hose (5) downstream of the filter, connected to a combustion chamber of an engine. Several transmission apertures (80a,b) closed by air-permeable elements (8a,b) are located in two of the components, e.g. intake pipe, filter, or hose. The volume of air passing through the air-permeable elements is fixed at alternating levels, to phase intake noise generated by the intake and transmitting noise generated by the air-permeable elements. |
