Digital speedometer displaying of measured object without flicke

Details Digital speedometer displaying of measured object without flicke Digital speedometer displaying of measured object without flicke

1989-06-16

1991-03-26

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

364565, G01P 348, G01P 354

Patent

active

050032577

ABSTRACT:
A digital speedometer includes a pulse counter, a timing pulse generator, an indicator register, a display, and a comparator for comparing the magnitude relationship between a counted value counted by the pulse counter and the memorized value of the indicator register, two counters in addition to the pulse counter, and a plurality of logic circuits. The comparator generates signals indicative of the magnitude relationship between the counted value and the memorized value. The two counters may output a first or second gate signal respectively to the AND gate connected to the indicator register, in response to the signals output from the comparator at a predetermined time cycle depending upon the gate time controlled by the timing pulse generator, in such a manner so as to renew the memorized value with the counted value only when the number of occurrences of the output of the first or second signals reaches a preset number thereof. The digital speedometer further comprises a decision circuit for renewing the memorized value with the counted value of the pulse counter only when the memorized value is 0, regardless of the number of occurrences of the output of the first or second signals counted by either of the two counters.

REFERENCES:
patent: 4158172 (1979-06-01), Boyer et al.

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