Claims
- 1. An active noise attenuation system comprising:
an air inlet duct housing having an inlet end into which air is drawn and an outlet end operably connected to an engine; a sound detector for sensing noise emanating from said air inlet duct and generating a noise signal corresponding to said noise; a speaker mounted within said air inlet duct housing and facing said inlet end; a resonator supported by said housing and positioned between said speaker and said engine for reducing low frequency engine noise; and a controller for receiving and phase shifting said noise signal and sending a control signal to said speaker to generate a sound field to attenuate said noise.
- 2. A system according to claim 1 wherein said resonator attenuates said low frequency noise resulting in an attenuated engine noise level and said sound detector senses said attenuated engine noise level.
- 3. A system according to claim 1 including an air filter for filtering contaminants from the air, said filter being positioned behind said speaker.
- 4. A system according to claim 3 wherein said resonator is mounted to said filter.
- 5. A system according to claim 4 wherein said filter is cylindrically shaped with a first end fitting over said resonator and a second end fitting over said outlet end.
- 6. A system according to claim 3 wherein said resonator extends outwardly from said housing between said filter and said engine.
- 7. A system according to claim 1 wherein said resonator reduces low frequency engine noise within a predetermined range.
- 8. A system according to claim 7 wherein said speaker is less than four hundred millimeters in diameter.
- 9. An active noise attenuation system comprising:
an engine for generating low frequency noise having a profile defining a peak noise; an air inlet duct housing having an inlet into which air is drawn and an outlet operably connected to said engine; a speaker mounted within said air inlet duct housing and facing said inlet; an air filter mounted within said housing between said inlet and outlet for filtering contaminants from the air; a resonator supported by said housing and positioned between said speaker and said engine for attenuating said peak noise resulting in an attenuated low frequency engine noise; a sound detector for sensing said attenuated low frequency engine noise and generating an attenuated low frequency engine noise signal; and a controller for receiving and phase shifting said attenuated low frequency engine noise signal and sending a control signal to said speaker to generate a sound field to attenuate said attenuated low frequency engine noise signal.
- 10. A system according to claim 9 wherein said resonator attenuates said peak noise within a predetermined range.
- 11. A system according to claim 10 wherein said speaker is less than four hundred millimeters in diameter.
- 12. A system according to claim 10 wherein said filter is cylindrically shaped with a first end fitting over said resonator and a second end fitting over said outlet end.
- 13. A system according to claim 20 wherein said resonator extends radially outward from said housing between said filter and said engine.
RELATED APPLICATION
[0001] This application claims priority to provisional application No. 60/205,731 filed on May 19,2000.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60205731 |
May 2000 |
US |