Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1994-07-11
1995-05-23
Brinich, Stephen
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
381 94, G10K 1116
Patent
active
054188580
ABSTRACT:
A generalized minimum variance type of control operates on combined optimal and self-tuning control theorems, and is applicable to the design of active, semi-active, and hybrid vibration control systems. The system operates in a multiple-input/multiple-output manner, so when both noise and vibration are important, e.g. interior of a vehicle, the resulting nulling signal will be based on diminishing both vibrations and noise. The system operates by directly nulling primary vibrations, in an active mode, and/or by developing a variable bandwidth mechanical filter, in a semi-active mode, and applying nulling signals accordingly to the vibration source. Artificial intelligence is incorporated into the system to learn on-line the dynamics of the system, e.g. vehicle modal parameters. This intelligence is used to modify decision making in the system, based on results of past performance, without reprogramming or tuning of the system. The system incorporates digital electronic circuitry to convert acceleration and/or audio signals into proper format for the software logic residing in a microprocessor chip. Synchronizing signal is not needed. Hardware used includes a state of the art high power microprocessor, capable of handling sixteen sensory input signals and generating eight output signals. Controlling noise and vibration control in a vehicle, four audio signals from the driver, passenger, and back seat areas, and accelerometer signals from different seat tracks, the steering column, and the floor pan can be input to the microprocessor. Resulting control signals can be two for adjustable front engine mounts, and six for the adjustable body (cradle) mounts. Software resident in memory includes a first program to perform a modal extraction of vibration and/or noise from the sensors, to perform a minimum variance calculation, then to perform an intelligent control calculation based on recorded past performance and on fuzzy logic compensation. Output signals generated and applied to actuators minimize and/or filter the vibration or noise.
REFERENCES:
patent: 4122303 (1978-10-01), Chaplin et al.
patent: 4153815 (1979-05-01), Chaplin et al.
patent: 4417098 (1983-11-01), Chaplin et al.
patent: 4473906 (1984-09-01), Warnaka et al.
patent: 4477505 (1984-10-01), Warnaka
patent: 4489441 (1984-12-01), Chaplin
patent: 4490841 (1984-12-01), Chaplin et al.
patent: 4527282 (1985-07-01), Chaplin et al.
patent: 4562589 (1985-12-01), Warnaka et al.
patent: 4566118 (1986-01-01), Chaplin et al.
patent: 4600863 (1986-07-01), Chaplin et al.
patent: 4649505 (1987-03-01), Zinser et al.
patent: 4654871 (1987-03-01), Chaplin et al.
patent: 4677676 (1987-05-01), Guinta
patent: 4677677 (1987-05-01), Di Mino
patent: 4862506 (1989-08-01), Landgarten et al.
patent: 4947435 (1990-08-01), Taylor
patent: 5039073 (1991-08-01), Reichard et al.
patent: 5052529 (1991-10-01), Sutcliffe et al.
A Multiple Error LMS Algorithm and Its Application to the Active Control of Sound and Vibration; Elliott, Strothers, Nelson; IEEE Transactions on Acoustics, Speech and Signal Processing; vol. ASSP-33 No. 10, Oct. 1987.
A Unified Control Strategy for the Active Reduction of Sound and Vibration; Doelman; Journal of Intelligent Material Systems and Structures; vol. 2 No. 4, pp. 558-580, Oct. 1991.
Application of Self-Tuning Control Strategies to the Active Reducton of Sound; Doelman, Doppenberg; International Conference on Control '91; vol. 1, pp. 121-126.
Active Attenuation of Noise--The State of the Art; Warnaka; Noise Control Engineering, May-Jun. 1986, pp. 100-110.
Active Noise Reduction Systems in Ducts; Tichy, Warnaka, Poole; ASME 84-WA/NCA-15.
Active Control of Commerical Vehicle Exhaust Noise; Trinder, Chaplin, Nelson; Inter-Noise Jul. 1986, pp. 611-616.
The Cancellation of Repetitive Noise and Vibration; Chaplin; Inter-Noise Dec. 1980.
Brinich Stephen
Cooper Tire & Rubber Company
Grant II Jerome
Nauman Joseph G.
LandOfFree
Method and apparatus for intelligent active and semi-active vibr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for intelligent active and semi-active vibr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for intelligent active and semi-active vibr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2146501