| 摘要 |
PROBLEM TO BE SOLVED: To provide an adaptive control method for cyclic signal more accelerating convergent speed. SOLUTION: A cyclic signal f(n) to be applied to an observation point 24 contains a specified component to suppress an angular vibration number Wk An adaptive signal generation algorithm 11 generates an adaptive signal y(n) constituted by synthesizing the sine wave signal of amplitude ak (n) and phaseϕk (n), applies this signal through transmission characteristics G(23) to the observation point 24 as a cancel signal z(n) and suppresses an error signal e(n) by canceling this signal together with the specified component of cyclic signal f(n). An adaptive coefficient vector update algorithm 12 is led out by a gradient method not with a square error but with a fourth power raised error as an evaluation function, and these amplitude and phase are adjusted. Since this adjustment is performed not according to a least square method but according to a least fourth power raising method, the convergent speed is accelerated in the range of large error signal e(n) and the error signal e(n) is speedily suppressed.
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