Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Counter includes circuit for performing an arithmetic function
Patent
1988-02-25
1989-11-21
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Counter includes circuit for performing an arithmetic function
377 55, 328158, 328140, 307354, 324 78D, G01R 2310
Patent
active
048827401
ABSTRACT:
A frequency of a signal, particularly a frequency, partly varied as time passes, of a signal is counted in real time by producing a delay signal by delaying the signal as much as a predetermined time, detecting delayed zero-cross pulses from the delayed signal, detecting zero-cross pulses from the non-delayed signal, counting a first number of the delayed zero-cross pulses after the predetermined time is over, counting a second number of the zero-cross pulses during and after the predetermined time, producing a number difference between the first number and the second number by subtracting the first number from the second number and halving the number difference. The predetermined time is designated longer than a half period of the signal frequency to be counted. When the predetermined time is set long, the average frequency of the signal is counted, and when that is set short comparing with the partly varied interval of the signal frequency, the partly varied frequency of the signal is counted in real time.
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Abe Yoshitaka
Murakami Keiichi
Fujitsu Limited
Heyman John S.
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