Grade calculating circuit for fuzzy inference

Details Grade calculating circuit for fuzzy inference Grade calculating circuit for fuzzy inference

1993-09-27

1995-04-25

MacDonald, Allen R.

395 51, 395900, G06G 700

Patent

active

054106338

ABSTRACT:
A grade calculating circuit (FIG. 1) used for fuzzy inference computation is disclosed. The circuit calculates input label grades based on the relationships between input data (Xi) and the input labels, defined by membership functions (MF) having at least one inclined line segment (FIG. 3), said grades having the upper and lower limit values (g.sub.max, g.sub.min). The circuit comprises: memory (20) for memorizing the input label membership functions by storing, for each of the membership functions, a function form type code, a bending point (Xo) at an end of the inclined line segment and a multiplication rule which designates a multiplier (2.sup.n +2.sup.m) proportional to the inclination of the inclined line segment; a horizontal distance calculating circuit (40) for calculating a horizontal distance (Xi - Xo) between an input datum (Xi) and the bending point (Xo) for said each of the membership functions; a multiplication circuit (50) for performing operation according to said multiplication rule on said horizontal distance, to provide a grade value determined by the inclined line segment with respect to the horizontal distance; and a selecting circuit ( 60) for selecting one value as an input label grade, from the grade value provided by the multiplication circuit, the upper limit grade value of the membership function and the lower limit grade value of the membership function.

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A Multiplier Chip with multiple-valued Bidirectional Current-mode Logic Circuits. M. Kameyama Apr. 30, 1988.
Fuzzy multiple-Input Max and Min circuits in current mode and their analyses using bounded difference equations M. Sasaki Jun. 1990 IEEE.
Fast Digital Fuzzy Operation Units Using Comparison Look-Ahead Han et al IEEE, 12-14 Aug. 1990 pp. 870-873.

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