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.
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 μ 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 η of a distance value (k) between the samples is obtained. A fuzzy rule is applied, the weighting value P of the μ and η 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.
PAGNI ANDREA
POLUZZI RINALDO
RIZZOTTO GIANGUIDO
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