Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1986-09-25
1987-09-22
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
318314, 360 52, 360 70, G05B 1921, G11B 2102
Patent
active
046957812
ABSTRACT:
A time interval measuring apparatus includes a single main counter, and a plurality of latch circuits each for latching the count content of the main counter every time a plurality of different pulses are supplied thereto. In this apparatus, one of the count contents, corresponding to two pulses to be measured, is substracted from the other thereof, thereby measuring the interval between the two pulses. This apparatus includes a circuit for stopping the count operation of the main counter before the count content of the main counter is latched, when a pulse is supplied, a circuit for storing the number of stop operations of the main counter performed within the time interval between the two pulses to be measured, and a circuit for correcting the time interval by a value corresponding to the count stop time, in accordance with the stored data representing the number of counter stop operations, when the time interval is obtained by subtracting the counter content from the latched content. Then, the operation margin of the main counter is increased, while the entire circuit scale is decreased.
REFERENCES:
patent: 4243921 (1981-01-01), Tamura et al.
patent: 4278924 (1981-07-01), Mawatari et al.
patent: 4500822 (1985-02-01), Tajima et al.
patent: 4626936 (1986-12-01), Yoshino
patent: 4647828 (1987-03-01), Wachi
Kabushiki Kaisha Toshiba
Ro Bentsu
Shoop Jr. William M.
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