UBC Theses and Dissertations

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UBC Theses and Dissertations

A function generator for a time sequential analogue computer. Stacey, John Sydney


The large numbers of functions required in computations concerned with systems simulation have often resulted in function generators being very bulky, inflexible and expensive pieces of apparatus. This is because a separate system is often required for each function to be generated. The method proposed here enables a large number of functions to be generated by a minimum of equipment. Moreover, the arrangement is very flexible and should prove accurate to within 1%. This unit is designed for a time sequential analogue computer. This method of computation enables the functions F(X) to be stored and each sampled at a discrete value of X by a single sampling system. The functions are stored as photographs mounted around the surface of a rotating drum. Each function is sampled in turn by a beam of light and a photocell system. The position of the beam, (controlled by a galvanometer), determines the value of X at which the function is being sampled. The output from the photocell is arranged to indicate the value of F(X). In this unit up to 1000 samples per second can be made from 15 different functions - all at different values of X if necessary. The flexibility is such that the number of functions stored could be greatly exceeded with very little extra equipment.

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