Adaptive threshold logic



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In the last few years, much work has been done in the area of adaptive systems. Most of the work has been purely theoretical, however. The circuitry available has been generally complex. The purpose of the research reported here was to develop a simple but reliable adaptive threshold gate, the basic building block of adaptive systems. An adaptive threshold gate is a logic gate whose output is a function of its inputs weighted by scalar values. The gate is 'trained' by modifying the scalars, called weights, according to one of several algorithms which have been developed. Thus, a weight requires some form of memory. An analog memory is desirable since its information is easy to use. The value of the weight should have the capability of being retained indefinitely but should be easy to change. [...]