Active vibration or noise suppression system

摘要

An active vibration or noise suppression system is provided that achieves fast convergence of vibration or noise. A sine wave control signal y(n) is constituted by frequency of a vibration or noise source, and an amplitude filter coefficient a(n) and a phase filter coefficient φ(n) as an adaptive filter coefficient. The sine wave control signal y(n) is expressed by a sine wave having an amplitude component and a phase component, and each of an amplitude update term Δa(n+1) and a phase update term Δφ(n+1) includes a sine wave or cosine wave term having an amplitude component and a phase component. The phase component of the sine wave control signal y(n) is multiplied by a coefficient other than 1, or the phase component of the sine wave or cosine wave term of each of the amplitude update term Δa(n+1) and the phase update term Δφ(n+1) is multiplied by a coefficient other than 1.

主权项

1. An active vibration or noise suppression system is applied to a vehicle for actively suppressing vibration or noise at an evaluation point by outputting control vibration or control sound, comprising:
an active vibration or noise suppression circuit that generates a sine wave control signal y(n) constituted by frequency of a vibration or noise source, and an amplitude filter coefficient a(n) and a phase filter coefficient φ(n) as an adaptive filter coefficient;
outputs the control vibration or control sound corresponding to the sine wave control signal y(n);detects, at the evaluation point, a residual error signal e(n) generated by interference between vibration or noise caused by the vibration or noise source and the control vibration or control sound;calculates an amplitude update term Δa(n+1) to be added to or subtracted from a last updated value of the amplitude filter coefficient a(n) for update, so as to reduce the residual error signal e(n); andcalculates a phase update term Δφ(n+1) to be added to or subtracted from a last updated value of the phase filter coefficient φ(n) for update, so as to reduce the residual error signal e(n), the sine wave control signal y(n) is expressed by a sine wave having an amplitude component and a phase component, each of the amplitude update term Δa(n+1) and the phase update term Δφ(n+1) contains a sine wave or cosine wave term having an amplitude component and a phase component, and the phase component of the sine wave control signal y(n) is expressed by multiplying a coefficient other than 1 by the phase filter coefficient φ(n), or the phase component of the sine wave or cosine wave term of each of the amplitude update term Δa(n+1) and the phase update term Δφ(n+1) is expressed by multiplying a coefficient other than 1 by the phase filter coefficient φ(n), wherein the active vibration or noise suppression circuit improves convergence, wherein the phase component of the sine wave control signal y(n) is expressed by multiplying a value greater than 1 by the phase filter coefficient φ(n), and wherein the sine wave control signal y(n) is expressed by Equation (1);[Equation 1]
y(n)=a(n)·sin(ω·t(n)+q·φ(n))  (1)wherein:
y(n): sine wave control signal a(n): amplitude filter coefficient φ(n): phase filter coefficient ω: angular frequency q: phase multiplier coefficient (q >1) t(n): sampling time (n): the number of samples (time step).