A pseudo-random pulse train generator with controllable rate for modelling of audiometric systems

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Abstract
Design details are given of a pseudo-random pulse train generator. The generator produces a sequence of ‘0’ and ‘1’ pulses which occur at uniform time intervals, and with a controllable average rate of ‘0’s to ‘1’s, but in which the detailed distribution of ‘0’s and ‘1’s is essentially random. The system is such that the output pattern can be repeated. The instrument has been developed to simulate the behaviour of a human listener's response to sound in the region of the auditory threshold but may find applications in other simulations employing Monte Carlo methods, etc. The system is easily constructed and by using modern integrated circuits only a small number of packages is required.

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