Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Measuring or testing
Patent
1996-07-31
1997-11-18
Wambach, Margaret Rose
Electrical pulse counters, pulse dividers, or shift registers: c
Applications
Measuring or testing
G01B 700
Patent
active
056895399
ABSTRACT:
In order to measure an individual time interval with accuracy beyond frequency limit of semiconductors, a time measurement system of the invention generates a series of delayed pulses, each of which has the same pulse width with the time interval to be measured and delayed by a unit delay time shorter than a cycle time of a system clock from its preceding delayed pulse. A series of discriminate number measurement pulses are also generated from the series of delayed pulses, each of which rises at a common time and falls at each corresponding delay pulse. From number of a longest sequence of the same pulse number of the system clock counted in the discriminate number measurement pulses, the unit delay time is measured. From average value of pulse numbers of the system clock counted in each of the delayed pulses, the time interval to be measured is calculated with accuracy of the unit delay time.
REFERENCES:
patent: 5440602 (1995-08-01), Gimmler et al.
patent: 5487096 (1996-01-01), Pearson et al.
patent: 5487097 (1996-01-01), Hatekenaka et al.
patent: 5579356 (1996-11-01), Chevallier
NEC Corporation
Wambach Margaret Rose
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