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US 5,396,579 AGranted
Membership function generator
AssigneeRohm Co., Ltd.
InventorsYukichi Koji, Masanari Oh
Life of this patent
Estimating the term…
Abstract
A membership function generator including a maximum value arithmetic circuit for selecting a maximum voltage of a plurality of first input voltages to output the selected maximum voltage and a minimum value arithmetic circuit for selecting a minimum voltage of a plurality of second input voltages to output the selected minimum voltage. The outputs of the maximum and minimum value arithmetic circuits are input to a differential amplifier circuit. The output of the differential amplifier circuit is used as a membership function. Either at least one of the first input voltage or one of the second input voltages forms the basis of an inference and the remaining input voltages are set to a predetermined reference voltage.
Claims11
A membership function generator comprising:
- a maximum value selector having a plurality of first input terminals and an output terminal, wherein said maximum value selector selects and outputs a maximum voltage from a plurality of first input voltages provided to said first input terminals;
- a minimum value selector having a plurality of second input terminals and an output terminal, wherein said minimum value selector selects and outputs a minimum voltage from a plurality of second input voltages provided to said second input terminals;
- and
- a differential amplifier circuit having input terminals connected to the output terminals of the maximum value selector and the minimum value selector, wherein said differential amplifier circuit amplifies a difference of the voltages output from the maximum value selector and the minimum value selector to generate an amplified result as a membership function, a connected one of the plurality of first input terminals is connected to a connected one of the plurality of second input terminals, the voltage applied to the connected first and second input terminals is an inference-input voltage to form the basis of an inference and remaining ones of the plurality of first input terminals are set at a first reference voltage, and remaining ones of the plurality of second input terminals are set at a second reference voltage.
1 more element
A membership function generator comprising:
- a maximum value selector having a plurality of first input terminals and an output terminal, wherein said maximum value selector selects and outputs a maximum voltage from a plurality of first input voltages provided to said first input terminals;
- a minimum value selector having a plurality of second input terminals and an output terminal, wherein said minimum value selector selects and outputs a minimum voltage from a plurality of second input voltages provided to said second input terminals;
- and
- a differential amplifier circuit having input terminals connected to the output terminals of the maximum value selector and the minimum value selector, wherein said differential amplifier circuit amplifies a difference of the voltages output from the maximum value selector and the minimum value selector to generate an amplified result as a membership function, one of the first input terminals is connected to all of the plurality of second input terminals, a predetermined reference voltage is input to the connected first and second input terminals, and an inference-input voltage to form the basis of an inference is applied to each of the remaining ones of the plurality of first input terminals.
1 more element
A membership function generator comprising:
- a maximum value selector having a plurality of first input terminals and an output terminal, wherein said maximum value selector selects and outputs a maximum voltage from a plurality of first input voltages provided to said first input terminals;
- a minimum value selector having a plurality of second input terminals and an output terminal, wherein said minimum value selector selects and outputs a minimum voltage from a plurality of second input voltages provided to said second input terminals;
- and
- a differential amplifier circuit having input terminals connected to the output terminals of the maximum value selector and the minimum value selector, wherein said differential amplifier circuit amplifies a difference of the voltages output from the maximum value selector and the minimum value selector to generate an amplified result as a membership function, all of the plurality of the first input terminals are connected to at least one of the plurality of second input terminals, a predetermined reference voltage is input to the connected first and second input terminals, and an inference-input voltage is applied to each of the remaining ones of the plurality of second input terminals.
1 more element
A membership function generator comprising:
- a maximum value selector having a plurality of first input terminals and an output terminal, wherein said maximum value selector selects and outputs a maximum voltage from a plurality of first input voltages provided to said first input terminals;
- a minimum value selector having a plurality of second input terminals and an output terminal, wherein said minimum value selector selects and outputs a minimum voltage from a plurality of second input voltages provided to said second input terminals;
- and
- a differential amplifier circuit having input terminals connected to the output terminals of the maximum value selector and the minimum value selector, wherein said differential amplifier circuit amplifies a difference of the voltages output from the maximum value selector and the minimum value selector to generate an amplified result as a membership function, the differential amplifier circuit including:
- a first transistor having an emitter, a collector and a base, the base of the first transistor connected to the output of the maximum value selector;
- a second transistor having an emitter, a collector and a base, the base of the second transistor connected to the output of the minimum value selector;
- a constant current source for supplying a predetermined sum value of current to the emitters of the first and second transistors;
- a first resistor interposed between the emitter of the first transistor and the constant current source;
- a second resistor interposed between the emitter of the second transistor and the constant current source;
- a first current mirror type output circuit connected to the collector of the second transistor, the first current mirror type output circuit having a third resistor for converting a collector current of the second transistor into a voltage to output as the membership function;
- and
- a second current mirror type output circuit connected to the collector of the first transistor, the second current mirror type output circuit having a fourth resistor for converting a collector current of the first transistor into a voltage to output as a reciprocal membership function with respect to the first current mirror type output circuit, and
- the membership function output from the first current mirror type output circuit is either a .pi.-type membership function or a triangular membership function, and the membership function output from the second current mirror type output circuit is either a U-type membership function or a triangular membership function.
10 more elements
Dependencies are inferred from the claim text.