Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1974-11-21
1976-04-20
Chatmon, Jr., Saxfield
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328 60, 328 61, 328140, 307241, 307269, 307271, 354 50, H03K 117
Patent
active
039522539
ABSTRACT:
An event that occurs repetitively at continuously changing frequencies can be used to generate a triggering pulse which is used to synchronize or control. The triggering pulse is generated at a predetermined percentage of the period of the repetitive waveform without regard to frequency. Counts are accumulated in two counters, the first counting during the "on" fraction of the period, and the second counting during the "off" fraction. The counts accumulated during each cycle are compared. On equality the trigger pulse is generated. Count input rates to each counter are determined by the ratio of the on-off fractions of the event waveform and the desired phase relationship. This invention is of particular utility in providing a trigger or synchronizing pulse during the open period of the shutter of a high-speed framing camera during its acceleration as well as its period of substantially constant speed.
REFERENCES:
patent: 3597539 (1971-08-01), Clark
patent: 3671873 (1972-06-01), Haas
patent: 3675047 (1972-07-01), Bayne et al.
patent: 3698806 (1972-10-01), Reitz, Jr.
patent: 3714470 (1973-01-01), Goldberg
patent: 3789307 (1974-01-01), Clark
patent: 3805167 (1974-04-01), Nash
patent: 3824608 (1974-07-01), Toyoda et al.
DeVolpi Alexander
Pecina Ronald J.
Travis Dale J.
Carlson Dean E.
Chatmon, Jr. Saxfield
Churm Arthur A.
Reynolds Donald P.
The United States of America as represented by the United States
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