PROBLEM TO BE SOLVED: To accurately reproduce even signals accompanied by noise in simple constitution by specifying the front of the signals with the fluctuation of the signals, a distance between samples and a reproduction sample as variables and sectioning the fluctuation by the noise. SOLUTION: The respective minimum values and maximum values S.MIN, S.MAX, ERR.MIN and ERR.MAX of sample signals s(t) and noise sampled err(t) are obtained by a maximum value/minimum value decision unit 63 and stored in a second data storage device 64 and the maximum fluctuation values VX and VN of the signals and the noise are calculated in a difference unit 65. The respective difference levels of the true value of D for which the VX and VN are limit values are combined with respective samples in a fuzzy calculation unit 67 and the maximum and minimum true value of a distance value (k) between the samples is obtained. A fuzzy rule is applied, the weighting value P of the and is obtained in a weighting calculation unit 69. Each D and (k) are combined, sample reproduction output signals (o) are fed back from an output calculation unit 70 to the difference unit 65, a difference with the signals S is calculated and the noise is decided and sectioned.
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