Registers – Platform operated – Platform actuated traffic counters
Patent
1977-02-22
1978-06-06
Thesz, Joseph M.
Registers
Platform operated
Platform actuated traffic counters
235 92FQ, 235 92DM, 235 92R, 235 92CP, 364701, 364766, G01R 2302
Patent
active
040938506
ABSTRACT:
A fast response digital ratemeter is disclosed which calculates the reciprocal of every period between consecutive event pulses. A period counter is continuously incremented by clock pulses of a known frequency and measures the interval between event pulses by accumulating the clock pulses. Each event pulse both marks the end of the previous period and the beginning of the new period by latching the accumulated incremented counts of the period counter into a memory and resetting the period counter to immediately begin re-accumulating clock pulses occurring in the new period. The memory applies the accumulated counts as a divisor to divider means which divides the divisor into a known constant by repetitively subtracting the divisor from the constant. Since the divisor is retained by the memory, incrementation to the value of the divisor is necessary only once (during measurement of the period by the period counter), not before each subtraction, thus minimizing calculation time. Display counter means count the number of subtractions performed and display this as the rate of recurrence of input events in units determined by the constant. Decimal point shifting (including underflow and overflow detection), period averaging, overrun detection, and synchronization of event and clock pulses are also disclosed.
REFERENCES:
patent: 3578960 (1971-05-01), Georgi et al.
patent: 3705296 (1972-12-01), Kochi
patent: 3859512 (1975-01-01), Ritzinger
patent: 3922670 (1975-11-01), Shaw et al.
patent: 4027146 (1977-05-01), Gilmore
patent: 4031373 (1977-06-01), Beckwith
Matthew L. Fichtenbaum, Counter Inverts Period to Measure Low Frequency, "Electronics", Mar. 4, 1976, pp. 100-101.
Karnowski Thomas A.
Shawaluk Michael W.
Autio William A.
Cutler-Hammer, Inc.
Rather Hugh R.
Taken Michael E.
Thesz Joseph M.
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