Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1995-05-22
1997-05-13
Coles, Sr., Edward L.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
381 94, A61F 1106, H04B 1500
Patent
active
056299869
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, without reprogramming or tuning the system. Software resident in memory includes a first program a modal extraction of vibration and/or noise from the sensors, to perform a minimum variance 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.
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Coles Sr. Edward L.
Cooper Tire & Rubber Company
Grant II Jerome
Nauman Joseph G.
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