Patent ID: 6084971
Filing Date: 2000-07-04
Classification: F02M,G10K

Abstract:
An active noise attenuation system for an air induction system, said system comprising:an air inlet duct having an open end into which air is drawn;a fairing body concentrically mounted within said air inlet duct to define an annular flow passage at said open end thereof;a loudspeaker mounted to be facing outwardly from said air inlet duct and lying substantially in a plane defined by said open end of said air inlet duct;a sound detector disposed to sense noise from said air inlet duct and produce an electrical signal corresponding thereto; anda signal controller means receiving said electrical signal and amplifying and phase shifting said signal, said amplified and phase shifted signal applied to said loudspeaker to broadcast a sound field within a noise sound field emanating from said annular flow passage, whereby said emanating noise is attenuated by the interaction of said loudspeaker sound field with said emanating noise sound field,further including an air filter ring element inserted in said annular flow passage.