Digital time interval sensor using a free running counter and a

Details Digital time interval sensor using a free running counter and a Digital time interval sensor using a free running counter and a

1977-01-06

1978-05-16

Corcoran, Robert J.

Electricity: measuring and testing

Electrical speed measuring

Including 'event' sensing means

324181, 235 92T, 235 92TF, 235 92FQ, 324 78D, G04F 900, G01R 2302, G01S 904

Patent

active

040901335

ABSTRACT:
Intervals between zero crossings of tone signals on two incoming lines are measured by a clock driven, free running binary counter common to the two lines and by an overflow counter individual to each line. The overflow counter is reset by the reception of the zero crossing of the tone signal and is then advanced by each overflow and recycle of the common counter. The common count number, produced when the zero crossing at the start of the interval is received, is processed with the common count number and the overflow number, produced when the zero crossing at the end of the interval is received, to calculate the duration of the interval and thereby determine the frequency of the tone.

REFERENCES:
patent: 3537001 (1970-10-01), Friend
patent: 3760269 (1973-09-01), Beeman et al.
patent: 3876867 (1975-04-01), Schull et al.
patent: 3889189 (1975-06-01), Lode

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