Digital fuzzy inference apparatus having time divisional control

Details Digital fuzzy inference apparatus having time divisional control Digital fuzzy inference apparatus having time divisional control

1991-08-20

1993-02-09

Fleming, Michael R.

395 61, 395900, G06F 1518

Patent

active

051858495

ABSTRACT:
A digital fuzzy inference apparatus performs fuzzy inference by time-divisional control. A latch circuit latches an input signal. A parameter storage circuit stores a plurality of sets of parameters for defining membership functions constituting a plurality of fuzzy rules. A parameter switching circuit sequentially and selectively outputs one of the plurality of sets of parameters from the parameter storage circuit in accordance with a clock pulse. Every time one set of parameters are output from the parameter switching circuit, a single operation circuit performs a fuzzy rule operation with respect to the input signal stored in the latch circuit by using a membership function defined by the parameters, and outputs a degree to which the input signal meets the rule. An operation result storage circuit stores the output from the operation circuit at a storage position designated by the output parameters. A center-of-gravity calculator obtains the center of gravity of values stored in the operation result storage circuit when all the fuzzy operations based on the plurality of sets of parameters are completed.

REFERENCES:
patent: 4837725 (1989-06-01), Yamakawa
patent: 4860243 (1989-08-01), Ueno et al.
patent: 4875184 (1989-10-01), Yamakawa
Watanabe et al., "A VLSI Fuzzy Logic Controller with Reconfigurable, Cascadable Architecture", IEEE Journal of Solid-State Circuits, vol. 25(2), Apr. 1990, pp. 376-382.
Lim et al., "Implementing Fuzzy Rule-Based Systems on Silican Chips", IEEE Expert, Feb. 90, pp. 31-45.

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