Kabushiki Kaisha Toshiba

Yuichi Sekizawa

Tetsuya Kitamura

Toshiaki Shirasuna

Takeo Arafune

Tadatoshi Ishii

Akiyasu Yamamoto

A one-chip fuzzy processing apparatus is constituted by integrating a grade calculation circuit for obtaining the grades of IF part membership functions corresponding to a variable value, a THEN part membership function generator for generating THEN part membership functions, a combining circuit for modifying the THEN part membership functions, and combining the modified membership functions, and a defuzzify circuit for defuzzifying the output from the combining circuit. The combining circuit includes a circuit for obtaining a minimum value of grades of the IF part membership functions for each fuzzy rule, a circuit for comparing an obtained minimum value with a THEN part membership function for each fuzzy rule to cut a peak of the THEN part membership function, and a maximum processor for combining the THEN part membership functions by obtaining a maximum value of the modified THEN part membership functions. The defuzzify circuit includes a circuit for obtaining a center of gravity of the membership function combined by the combining circuit. The THEN part membership function generator is constituted by a counter, and a circuit for sequentially outputting the grades of the THEN part membership functions using the count values from the counter as x-coordinate values.

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Yokohama, Japan

Yuichi Sekizawa