Abstract: A rotating member produces a signal corresponding to a given value M of angular rotation thereof. A clock produces pulses at a given rate. A counter mechanism is responsive to the signal and to the clock pulses for generating a number related to the number of clock pulses produced during a unit value X of rotation of the rotating member where X is unequal to M. The number may be used to determine when a value N of angular rotation has occurred.

Abstract: A rotating member produces a signal corresponding to a given value M of angular rotation thereof. A clock produces pulses at a given rate. A counter mechanism is responsive to the signal and to the clock pulses for generating a number related to the number of clock pulses produced during a unit value X of rotation of the rotating member where X is unequal to M. The number may be used to determine when a value N of angular rotation has occurred.

Abstract: At the inception of a time interval whose duration is to be measured, pulses whose rate may be varied are applied to a first counter. A second counter controls the rate of the pulses applied to the first counter. An overflow sensing circuit is connected to the output of the first counter for, in response to each overflow signal at the output of the first counter, incrementing the second counter which then causes pulses having a new rate to be applied to the first counter and for, concurrently, presetting the counter to a new count. The new rate is equal to 1/N the old rate and the new count is equal to 1/N the count in the first control prior to the overflow. The elapsed time information in the circuit is therefore always valid.