Registers – Platform operated – Platform actuated traffic counters
Patent
1975-01-13
1976-07-20
Shaw, Gareth D.
Registers
Platform operated
Platform actuated traffic counters
235 92TF, 235 92CA, 235 92DE, 235 92R, H03K 2100, H03K 2130
Patent
active
039708284
ABSTRACT:
A system for measuring a first period of time, for example a period between a pair of pulses, with an extraordinarily high degree of accuracy. Two ramp voltages of different slopes are started in synchronism with the first occurring pulse. The ramp with the largest slope is then sampled and held on receipt of the second occurring pulse. A counter counts a clock of a moderate pulse repetition frequency (PRF) during a second period occurring between the time the ramps are started and the time the amplitude of the ramp of the smaller slope becomes equal to the sampled amplitude of the ramp of the larger slope. The count stored in the counter at the end of the second period is then directly proportional to the first period or is equal thereto. Moreover, the count can be far more precise than it would be by counting the clock PRF during the first period. By making the larger ramp slope 1,000 times as large, for example, as the smaller ramp slope, the precision of the measurement may be increased 1,000 times for the same clock PRF.
REFERENCES:
patent: 3380020 (1968-04-01), Clark
patent: 3840174 (1974-10-01), Craft
patent: 3867614 (1975-02-01), White
patent: 3878370 (1975-04-01), Santomango et al.
International Telephone and Telegraph Corporation
Shaw Gareth D.
Stolzy A. Donald
Vandenburg John P.
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