Adaptive noise cancellation

Details Adaptive noise cancellation Adaptive noise cancellation

1992-09-25

1995-03-07

Envall, Jr., Roy N.

Boots, shoes, and leggings

364572, 364574, 36472419, G06F 1546, G05B 1302

Patent

active

053964144

ABSTRACT:
A compensator that enables an adaptive filter to be placed within a closed loop control system so as to reduce the effects of both measurable and unmeasurable disturbances on the output of the control loop. The disturbances may have spectra that lie within or outside the bandwidth of the control loop. The effectiveness of the reduction is dependent upon the capabilities of the loop actuator and/or the control electronics. The reduction is not limited only to the bandwidth of the control loop, as in conventional disturbance rejection, and is equally effective against feedback path disturbances which are unreduced in conventional approaches. A further aspect of the invention relates to a reduction of an intrinsic noise floor associated with control systems, including open loop and closed loop control systems, that does not require an independent noise measurement to be made. Also, an adaptive controller is taught that places an adaptive filter in parallel with a control loop to provide a unity response control system that is insensitive to measurable disturbances and which furthermore has an improved control performance relative to a conventional control loop.

REFERENCES:
patent: 3932818 (1976-01-01), Masak
patent: 3961234 (1976-06-01), Chambers et al.
patent: 4177430 (1979-12-01), Paul
patent: 4238746 (1980-12-01), McCool et al.
patent: 4473906 (1984-09-01), Warnaka et al.
patent: 4524424 (1985-06-01), White
patent: 4589137 (1986-05-01), Miller
patent: 4649505 (1987-03-01), Ziegler, Jr. et al.
patent: 4658426 (1987-04-01), Chabries et al.
patent: 4730343 (1988-03-01), Kanemasa et al.
patent: 4878188 (1989-10-01), Ziegler, Jr.
patent: 5008937 (1991-04-01), Yamamura et al.
patent: 5029118 (1991-07-01), Nakajima et al.
patent: 5105377 (1992-04-01), Ziegler, Jr.
patent: 5157596 (1992-10-01), Alcone
patent: 5272663 (1993-12-01), Jones et al.
"Adaptive Noise Cancelling: Principles and Applications" B. Widrow et al., Proceedings of the IEEE, vol. 63, No. 12, Dec. 1975.
"Transform Domain LMS Algorithm" S. Shankar Narayan et al., IEEE Transactions on Acoustics Speech and Signal Processing, vol. ASSP-31, No. 3, Jun. 1983.

Affiliated with

Also associated with

Rating

Adaptive noise cancellation does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1411184