Back to results
US 5,475,761 AGranted
Adaptive feedforward and feedback control system
AssigneeNoise Cancellation Technologies, Inc.
InventorGraham P. Eatwell
Life of this patent
Estimating the term…
Abstract
An active control system for multiple interacting channels to control a constant noise or vibration consisting of first and second sensor means adapted to provide reference and residual signals respectively, a first and second filter means and first and second subtraction means to provide first and second output control signals and means for combining said output signals.
Claims25
A control system for controlling a continuing base disturbance, said system comprising
- a first sensor means for providing a reference signal related to said disturbance,
- a second sensor means for providing a residual signal related to a combination of the base disturbance and a controlling disturbance,
- a first subtraction means for subtracting a first compensation signal from said reference signal to produce a first input signal,
- a first filter means responsive to said first input signal to produce a first output signal,
- a second subtraction means for subtracting a second compensation signal from said residual signal to produce a second input signal,
- a second filter means responsive to said second input signal to produce a second output signal,
- combining means for combining said first and second output signals to produce a control signal, and
- actuator means adapted to respond to said control signal and to produce said controlling disturbance to thereby control said base sound or vibration disturbance by continually controlling it.
5 more elements
A control system with multiple interacting channels for controlling a continuing disturbance, said system comprising
- first sensor means to provide reference signals related to said disturbance,
- second sensor means to provide residual signals related to a combination of said continuing disturbance and a controlling disturbance,
- first subtraction means for subtracting first compensation signals from said reference signals to produce first input signals,
- first filter means responsive to said first input signals to produce first output signals,
- second subtraction means for subtracting second compensating signals from said residual signals to produce second input signals,
- second filter means responsive to said second input signals to produce second output signals,
- combining means for combining said first and second output signals to produce control signals, and
- actuator means adapted to respond to said control signals and to produce said control disturbances to thereby control said continuing disturbance.
5 more elements
Dependencies are inferred from the claim text.