Circuit for measuring average period of periodic signal

Details Circuit for measuring average period of periodic signal Circuit for measuring average period of periodic signal

G - Physics

01

R

324/37

G01R 23/10 (2006.01) G01R 23/02 (2006.01) G04F 10/04 (2006.01)

Patent

CA 1139844

ABSTRACT OF THE DISCLOSURE A device for determining the average period of a low-frequency periodic signal comprises a counter receiving stepping pulses from a high- frequency pulse generator and resetting pulses from a phase-angle detector monitoring the periodic signal. A shift register is loaded with the count of the counter in response to each pulse generated by the detector, in adder at an output of the shift register emitting a signal coding the sum of the contents of this register. Another shift register is loaded under the con- trol of the detector with the output sums of the adder and has a first and a last storage cell connected to a subtractor which emits a signal indicating changes in average period. Further registers and summing circuitry may be inserted between the adder and the additional shift register for increasing the number of periods taken to form each average-period estimate.

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