Claims
- 1. An active noise attenuation system comprising:
an air inlet duct housing having an open end into which air is drawn; a speaker mounted within said air inlet duct and including a first connector extending toward said open end; a sound detector for sensing noise emanating from said air inlet duct and generating a noise signal corresponding to said noise; and a controller having a second connector for engaging said first connector to electrically connect said controller to said speaker, said controller for receiving and phase shifting said noise signal to attenuate said noise emanating for said air inlet duct.
- 2. A system according to claim 1 wherein said controller is mounted on an external surface of said housing.
- 3. A system according to claim 2 wherein said controller includes a printed circuit board partially surrounded by heat conducting foam and a controller housing that is attached to said external surface.
- 4. A system according to claim 3 wherein said controller housing includes a snap-fit cover and seal for enclosing said printed circuit board within said controller housing.
- 5. A system according to claim 4 including a plurality of interface connections integrally formed within said cover as one piece.
- 6. A system according to claim 1 wherein said controller includes a first interface connection for communication with a battery, a second interface connection to ground, and a third interface connection for a serial port interface that communicates with an engine management system.
- 7. A system according to claim 1 wherein said speaker has a base portion radiating outwardly into a frustro-conical speaker portion defining a plane near said open end, said first connector including a wire assembly extending outwardly from said base and adjacent to said plane.
- 8. A system according to claim 7 including a mid-body portion concentrically mounted within said air inlet duct housing to define an annular flow passage between said housing and said mid-body portion, said speaker being concentrically mounted within said mid-body portion.
- 9. A system according to claim 8 wherein said sound detector includes a microphone supported by said housing and positioned beyond said plane adjacent to said open end.
- 10. A system according to claim 9 including a first flexible cable interconnecting said first and second connectors and a second flexible cable interconnecting said microphone to said controller.
- 11. A method for assembling an active noise attenuation system comprising the steps of:
(a) mounting an air inlet duct housing having an open end into which air is drawn to a vehicle structure; (b) positioning a speaker assembly within the air inlet duct housing such that a speaker face defining a plane is facing the open end; (c) supporting a sound detector on the housing to generate a noise signal corresponding to noise caused by airflow through the air inlet duct housing; and (d) connecting a controller to the speaker assembly through an electrical connection extending outwardly from the speaker assembly toward the plane to phase shift the noise signal.
- 12. A method according to claim 11 wherein step (b) includes concentrically mounting the speaker assembly to a mid-body portion concentrically formed within the air inlet duct housing to define an annular flow passage between the housing and the mid-body portion.
- 13. A method according to claim 11 wherein step (c) includes positioning the sound detector forwardly beyond the open end and the plane.
- 14. A method according to claim 11 wherein step (d) includes mounting a controller housing to an external surface of the air inlet duct housing, installing a printed circuit board and heat conducting foam within the controller housing, and snap-fitting a housing cover to the controller housing to enclose the printed circuit board within the controller housing.
- 15. A method according to claim 14 including the step of extending a support arm for the sound detector from the housing cover.
- 16. A method according to claim 11 including connecting the speaker to the controller with a first flex cable and connecting the sound detector to the controller with a second flex cable.
RELATED APPLICATION
[0001] This application claims priority to provisional application 60/193,225 filed on mar. 30, 2000.
Provisional Applications (1)
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Number |
Date |
Country |
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60193225 |
Mar 2000 |
US |