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The Simulation of Variable Delay
January 1968 (vol. 17 no. 1)
pp. 89-94
J. P. Seddon, Systems Engineering, International Business Machines, Winnipeg, Canada.
R. A. Johnson, Dept. of Elec. Engrg., University of Manitoba, Winnipeg, Canada.
A dual classification of variable delays 1) by their explicit dependence on time or through a state variable and 2) through their origins as ``pipe'' or ``nonpipe'' problems is presented. Techniques of simulation through standard analog components and, more particularly, transport devices are analyzed and further classification made of the latter to distinguish those suitable for state-variable delay systems from those that are not. The construction and testing of a simple variable delay are described. An application to a system in which the delay is a sinusoidal function of time is discussed in detail. A theory is presented that predicts what frequencies will be present in the output of such a device when excited by a sinusoid of commensurate frequency; experimental results corroborating this are presented. A scheme for converting a problem with variable delay to one with fixed delay is further analyzed and its range of application delimited. Conclusions include a discussion of the best type of simulator to be used for variable delay problems.
Citation:
J. P. Seddon, R. A. Johnson, "The Simulation of Variable Delay," IEEE Transactions on Computers, vol. 17, no. 1, pp. 89-94, Jan. 1968, doi:10.1109/TC.1968.5008879
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