Low frequency active noise control

Details Low frequency active noise control Low frequency active noise control

2005-10-25

2005-10-25

Pendleton, Brian T. (Department: 2644)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Within cabin or compartment of vehicle

C381S071500, C381S340000

Reexamination Certificate

active

06959093

ABSTRACT:
A noise attenuation system (10) for an air induction system (12) includes an air inlet duct (16) having an open end (18) to draw in air and a loudspeaker (22) mounted within the inlet duct (16) and facing the open end (18) of the inlet duct (16). The air horn (24) is connected to the loudspeaker (22) to tune the sound output and increase the sound power from the loudspeaker (22) to optimize cancellation of noise generated by the air induction system (16) at lower frequencies. An open end (18) of the air horn (24) is positioned within a plane defined by the open end (18) of the air inlet duct (16). A microphone (26) is positioned near the air inlet duct (16) and is in communication with a controller (28). The controller (28) generates an input to the loudspeaker (22). The input to the loudspeaker (22) is out of phase with the noise detected by the microphones (26) to cancel a portion of noise emitted from the open end (18) of the air inlet (16).

REFERENCES:
patent: 5386689 (1995-02-01), Bozich et al.
patent: 5446790 (1995-08-01), Tanaka et al.
patent: 5828759 (1998-10-01), Everingham
patent: 5850458 (1998-12-01), Tomisawa et al.
patent: 5860400 (1999-01-01), Stuart et al.
patent: 6084971 (2000-07-01), McLean

Affiliated with

Also associated with

Rating

Low frequency active noise control does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low frequency active noise control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low frequency active noise control will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3461429