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US 5,361,303 AGranted
Frequency domain adaptive control system
AssigneeNoise Cancellation Technologies, Inc.
InventorGraham P. Eatwell
Life of this patent
Estimating the term…
Abstract
A multiple-input, multiple-output adaptive control system which utilizes perturbations to the frequency components of the outputs to determine the desired changes to said coefficients. The control system is particularly suited to the active control of noise and vibration.
Claims24
An adaptive control system for reducing unwanted disturbances in a system with unknown or non-linear response, said control system comprising
- output waveform generator responsive to a timing or phase signal and output coefficient signals and adapted to produce output control signals configured to cause control disturbances,
- input sensing means adapted to respond to a combination of said control disturbances and said unwanted disturbances to thereby produce input signals,
- input processing means adapted to respond to said input signals to thereby produce first signals,
- timing signal generation means adapted to produce said timing or phase signals,
- gradient signal generating means adapted to respond to said first signals to produce a gradient signal,
- first integration means which has as input a second signal and produces an output coefficient signal, said second signal being a weighted combination of said perturbation signal, a gradient signal and said output coefficient signal and produces an output coefficient signal,
- perturbation generating means adapted to produce perturbation signals which perturb said output coefficient signals to thereby modify said control disturbances,
- said system characterized in that said gradient signal generator comprises
- delay means responsive to said second signal and producing a delayed signal,
- multiplier means for multiplying said first signals with said delayed signal, and
- second integration means which has as input a weighted combination of the output from said multiplying means and said gradient signal and produces as output said gradient signal.
8 more elements
An adaptive control system for reducing unwanted disturbances in a physical system with unknown or non-linear response, said control system comprising
- output waveform generator responsive to a timing or phase signal and output coefficient signals and adapted to produce output control signals configured to cause control disturbances,
- input sensing means adapted to respond to a combination of said control disturbances and said unwanted disturbances to thereby produce input signals,
- input processing means adapted to respond to said input signals to thereby produce first signals,
- timing signal generation means adapted to produce said timing or phase signals,
- adaption module means adapted to respond to said first signals to produce output coefficient signals,
- perturbation generating means adapted to produce perturbation signals which perturb said output coefficient signals to thereby modify said control disturbances,
- said system characterized in that said input processor comprises
- cost function generator responsive to said input signals and adapted to produce a third signal,
- delay means adapted to delay said third signal by a time related to the delay in said physical system,
- subtraction means responsive to said delayed third signal and said third signal and adapted to produce said first signal.
7 more elements
An adaptive control system for reducing unwanted disturbances in a system with unknown or non-linear response, said control system comprising
- output waveform generator responsive to a timing or phase signal and output coefficient signals and adapted to produce output control signals configured to cause control disturbances,
- input sensing means adapted to respond to a combination of said control disturbances and said unwanted disturbances to thereby produce input signals,
- input processing means adapted to respond to said input signals to thereby produce first signals,
- timing signal generation means adapted to produce said timing or phase signals,
- adaption module means adapted to respond to said first signals to produce output coefficient signals,
- perturbation generating means adapted to produce perturbation signals which perturb said output coefficient signals to thereby modify said control disturbances,
- said system characterized in that the level of said perturbation signals is scaled according to the level of the input signals or the level of a cost function dependent upon said input signals.
4 more elements
Dependencies are inferred from the claim text.