METHOD FOR DETERMINING CONVERGENCE COEFFICIENT OF ADAPTIVE CONTROLLER, ACTIVE NOISE CONTROLLER, AND ACTIVE VIBRATION CONTROLLER

摘要

PURPOSE: To easily set the convergence coefficient, used for probability gradient algorithm, to a proper value without depending upon a skilled person, etc. ;CONSTITUTION: The processes in the figure are performed at specific timing. Here, a rotational frequency control signal RC is outputted and the rotating speed of an engine is set to a rotational frequency at which the level of the booming sound is a problem (step 101); and gradient (Je/Wi) determining the update quantity of the update arithmetic of LMS algorithm is calculated (step 108) to find the steepest gradient (step 112), the optimum value |W_(opt)|² of power of an adaptive digital filter is found (step 107), and on the basis of the optimum value, an optimum point (W_0(opt), W_1(opt)) which is closest to an origin (0,0) is found (step 113). On the basis of the steepest gradient and optimum point, the convergence coefficient α is calculated (step 114).;COPYRIGHT: (C)1995,JPO