US5361303A — Frequency domain adaptive control system

Claim 1

Independent Claim 234 words

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.

Claim 2

Dependent Claim 234 words

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.

Claim 3

Dependent Claim 16 words

A system as in claim 1 in which said input processing means comprises an analog circuit.

Claim 4

Dependent Claim 17 words

A system as in claim 1 in which said output waveform generator means comprises an analog circuit.

Claim 5

Dependent Claim 16 words

A system as in claim 1 in which said adaption module means comprises an analog circuit.

Claim 6

Dependent Claim 17 words

A system as in claim 1 in which said adaption module means comprises a digital processing system.

Claim 7

Dependent Claim 21 words

A system as in claim 1 in which said perturbation signals are mutually orthogonal or independent over some fixed time period.

Claim 8

Dependent Claim 27 words

A system as in claim 1 in which the level of said perturbation signals is scaled on the level of a cost function or the input signals.

Claim 9

Dependent Claim 83 words

A system as in claim 1 in which said adaption module is a digital processor which operates according to the equations G.sub.j+1 =(1-α)G.sub.j +βδx.sub.j-T I.sub.j x.sub.j+1 =(1-λμ)x.sub.j -μG.sub.j +d.sub.j where α, β, μ and λ are parameters, I is the output from the input processor, G is the gradient signal, d is the perturbation signal, x is the output coefficient δx is a previous change to the output coefficient and T is the number of samples of delay associated with said delay means.

Claim 10

Dependent Claim 73 words

A system as in claim 1 in which said adaption module is an analog circuit which operates according to the equations ##EQU6## where α, β, γ, μ and λ are parameters, I is the output from the input processor, G is the gradient signal, d is the perturbation signal, x is the output coefficient, δx is a previous change to the output coefficient and T is the delay associated with said delay means.

Claim 11

Dependent Claim 17 words

A system as in claim 1 in which the said perturbation signals are mutually orthogonal or independent.

Claim 12

Dependent Claim 71 words

A system as in claim 1 in which the input processor operates to provide a complex output signal, I which is calculated according to the equation I.sub.j =δe*.sub.j e.sub.j where e is the vector of coefficients of the input signals at a particular frequency, δe is change in the vector of coefficients of the input signals over a specified time period and the star denotes the conjugate transpose of the vector.

Claim 13

Dependent Claim 22 words

A system as in claim 11 in which the timing signal is generated in response to a frequency and/or phase measuring means.

Claim 14

Dependent Claim 19 words

A system as in claim 1 in which uses the auto-correlation matrix of the changes in the output coefficients.

Claim 15

Dependent Claim 21 words

A system as in claim 13 in which the auto-correlation matrix of the changes in the output coefficients is approximated recursively.

Claim 16

Dependent Claim 193 words

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.

Claim 17

Dependent Claim 193 words

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.

Claim 18

Dependent Claim 25 words

A system as in claim 15 in which the delay is determined by the combined response time of the physical system and the control system.

Claim 19

Dependent Claim 28 words

A system as in claim 15 in which the delay is determined from the cross-correlation between the changes in the output coefficients and changes in the cost function.

Claim 20

Dependent Claim 163 words

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.

Claim 21

Dependent Claim 163 words

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.

Claim 22

Dependent Claim 27 words

A system as in claim 18 and including an electrical power transformer combined with actuators, sensors and configured so as to reduce noise radiated from the transformer.

Claim 23

Dependent Claim 24 words

A system as in claim 18 which includes a number of independent adaption module means, each of which controls one or more frequency coefficients.

Claim 24

Dependent Claim 23 words

A system as in claim 20 in which each adaption module means is packaged together with an actuator and or power amplifier means.

Claim 25

Dependent Claim 19 words

A system as in claim 20 in which each adaption module means is implemented as a single integrated circuit.

Claim 26

Dependent Claim 26 words

A system as in claim 18 and including a seat or headrest combined with actuators, sensors and adapted to reduce the sound in a specified region.

Claim 27

Dependent Claim 37 words

A system as in claim 23 and including a noise reducing system for vehicle or aircraft or marine cabins including one or more systems, characterized in that one adaption module is used with each seat or headrest.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1997-10-31	1998-05-02	1998-11-01	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2001-10-31	2002-05-02	2002-11-01	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2005-10-31	2006-05-02	2006-11-01	$7700.00	Window Closed / Lapsed

Frequency domain adaptive control system

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