| 摘要 |
PURPOSE: To actively perform a noise elimination with a simple constitution without using adaptive filters such as DSP by dividing sampling data and determining membership functions every sections. CONSTITUTION: In the noise elimination device in which a transfer function estimates the unknown transfer function of an unknown system and which actively eliminates noise by impressing a signal eliminating the noise of the system, this device is provided with a fuzzy adaptive filter 3 estimating the transfer function of the unknown system and generating a noise eliminating signal to be impressed on the output of the system. Plural time sequential sampling data Xj of an input signal are divided into N pieces of data and membership functions are determined every sections divided into N pieces and discrete sections are made to be interpolated by forms of the membership functions and the membership functions are actively updated in a member ship function updating part 16 by the error signal between the input signal and the output. Then, an optimum noise eliminating signal Gi is actively generated by performing a fuzzy inference in a fuzzy inferring part 12 by the input signal and the membership functions. |
