Patent ID: 8019090

Claim:
A signal processing method for reducing noise effects by using an error signal to generate a reference signal to compensate for an error signal input to drive signal to a plant, comprising the steps of: generating a reference signal x(n) with a signal generator; inputting the reference signal to a finite impulse response (FIR) filter that produces a filter output signal y(n); producing an error signal e(n) by differencing the transfer function output and a disturbance signal d(n); inputting the error signal to the signal generator and to a least mean square calculator; inputting the reference signal to a copy of the transfer function that outputs a modified reference signal x′(n); calculating an LMS signal that is filter coefficients to minimize mean square error signal; and inputting the LMS signal and the reference signal to the FIR filter, the FIR filter being arranged to process the LMS signal and the reference signal to minimize the error signal.