Ammunition and explosives – Igniting devices and systems
Patent
1975-10-09
1981-12-29
Birmiel, Howard A.
Ammunition and explosives
Igniting devices and systems
102212, 102417, 102427, 324260, 307351, H03K 5153, F42C 1308
Patent
active
043085016
ABSTRACT:
A digital circuit for sensing peaks exceeding a predetermined threshold in nalog signals employs clock and control oscillators arranged such that their frequencies vary in opposite senses in response to changes in the sensed signal. The clock oscillator frequency is counted during sample intervals of durations which vary inversely with the control oscillator frequency. A count increase (or decrease) of predetermined amount from one sample interval to the next, followed by a count decrease (or increase) from another sample interval to the next, results in an output signal. In a preferred embodiment, the clock frequency is counted in an up/down counter which, for each sample interval, is counted up and down for equal numbers of control oscillator cycles. The net count at the end of a sample interval is therefore an indication of the magnitude and polarity of changes in the sensed signal. In a particular utilization the circuit serves in a mine fuze and senses the peak of a magnetic field signal such as is associated with a tank or other vehicle.
REFERENCES:
patent: 3659208 (1972-04-01), Fussell
patent: 3813601 (1974-05-01), Reindl
patent: 3828259 (1974-08-01), Riethmuller et al.
Conner Michael
Tuccinardi Thomas E.
Birmiel Howard A.
Edelberg Nathan
Elbaum Saul
Gibson Robert P.
The United States of America as represented by the Secretary of
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