Systems and methods for disabling adaptation in an adaptive feedforward control system

One or more non-transitory machine-readable storage devices having encoded thereon computer readable instructions for causing one or more processors to perform operations comprising:

• transmitting a first noise-cancellation signal to a speaker, wherein the speaker transduces the first noise-cancellation signal to acoustic energy;
• receiving a speed signal of a structure having a predefined volume;
• preventing adjustment of one or more filter coefficients of an adaptive filter when the speed signal is below a maximum threshold;
• preventing transmission of the second noise-cancellation signal to the speaker when the speed signal is below a minimum threshold;
• permitting and adjusting transmission of the second noise-cancellation signal to the speaker in a linear gain or arbitrary gain when the speed signal is between the minimum threshold and the maximum threshold, and wherein the noise-cancellation signal is adjusted based on the speed signal;
• and
• adjusting one or more filter coefficients of the adaptive filter when the speed signal is within a third condition, wherein the one or more filter coefficients of the adaptive filter are used to filter a reference sensor signal based on residual noise to generate a second noise-cancellation signal, and wherein the residual noise results from the combination of acoustic energy of each of a first noise-cancellation signal and an undesired noise in the predefined volume.

A method for lowering an error signal in a vehicle cabin, comprising the steps of:

• generating a noise signal representative of undesired noise detected by a noise sensor of a vehicle;
• generating a noise-cancellation signal via a controller within the vehicle;
• transmitting the noise-cancellation signal to a speaker within the vehicle, wherein the speaker transduces the noise-cancellation signal to acoustic energy emitted into the vehicle cabin;
• detecting residual noise via a reference sensor in the vehicle cabin;
• wherein the residual noise results from the combination of the acoustic energy of the noise-cancellation signal and the undesired noise;
• generating the error signal via the reference sensor based on the residual noise;
• receiving the error signal and the noise signal at an adaptive processing module of the controller;
• generating a filter update signal via the adaptive processing module based on the error signal and the noise signal;
• receiving a speed signal at the adaptive processing module from an accelerometer of the vehicle;
• preventing adjustment of one or more filter coefficients of an adaptive filter of the controller based on the filter update signal when the speed signal is below a maximum threshold;
• preventing transmission of the noise-cancellation signal to the speaker when the speed signal is below a minimum threshold;
• permitting and adjusting transmission of the second noise-cancellation signal to the speaker in a linear gain or arbitrary gain when the speed signal is between the minimum threshold and the maximum threshold, and wherein the noise-cancellation signal is adjusted based on the speed signal;
• and
• adjusting one or more filter coefficients of the adaptive filter when the speed signal is within a third condition.