Active vibration controller

Details Active vibration controller Active vibration controller

1995-06-07

1997-12-23

Kuntz, Curtis

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 86, A61F 1106, H03B 2900

Patent

active

057013497

ABSTRACT:
An active vibration controller includes acceleration detectors for generating output signals on the basis of vibrations of a vehicle, speakers provided in a vehicle's cabin, microphones provided in the vehicle's cabin for receiving generated sounds from the speakers and road noises generated on the basis of running of the vehicle, and adaptive digital filters using output signals from the acceleration detectors as inputs for controlling filter factors on the basis of an RLS algorithm to minimize levels of output signals from the microphones in response to output signals from the microphones and output signals from the acceleration detectors through use of a transfer function matched to the transfer function of the vehicle's cabin in a sound field between the speakers and the microphones. The controller minimized levels of output signals from the microphones by developing an applied output signal to the speakers. Thus parameters of the filter factors are adaptively updated in accordance with identified system characteristics, providing satisfactory estimation accuracy, and quick convergence to changed sensed noise to silence road noise in the vehicle's cabin.

REFERENCES:
patent: 5022082 (1991-06-01), Eriksson et al.
patent: 5170433 (1992-12-01), Elliot et al.
patent: 5361303 (1994-11-01), Eatwell
patent: 5384853 (1995-01-01), Kinoshita et al.
patent: 5410605 (1995-04-01), Sawada et al.
patent: 5410606 (1995-04-01), Imai et al.
patent: 5416845 (1995-05-01), Shen
Extract from the dissertation of Vehicle Technique (vol. 45, No. 12, 1991) entitled "The Development of an Active Noise Control System for Vehicles" with the abridged English translation thereof.
"The Development of the Nissan Active Noise Control System" which is an abstract from Nissan Giho No. 30 (1991-12).
"Application of Active Attenuation to Car Booming Noise" which is an abstract from Mitsubishi Motors Technical Review (1992 No. 4).
"Active Control on Vehicle Booming Noise" publisher and publication date unknown, no english translation.

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