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1. 发明授权

US3952253A Method and means for generating a synchronizing pulse from a repetitive wave of varying frequency 失效
标题翻译：用于从不同频率的重复波产生同步脉冲的方法和装置
公开(公告)号：US3952253A
公开(公告)日：1976-04-20
申请号：US526039
申请日：1974-11-21
申请人： Alexander DeVolpi , Ronald J. Pecina , Dale J. Travis
发明人： Alexander DeVolpi , Ronald J. Pecina , Dale J. Travis
IPC分类号： G03B39/00 , H03L7/099 , H03K1/17
CPC分类号： G03B39/00 , H03L7/0992
摘要： 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.
摘要翻译：可以使用在连续变化的频率上重复出现的事件来产生用于同步或控制的触发脉冲。触发脉冲以重复波形的周期的预定百分比生成，而不考虑频率。计数累积在两个计数器中，第一次计数在“开”期间，第二次计数在“关”分数。比较每个周期中积累的计数。在相等的情况下，产生触发脉冲。对每个计数器的计数输入速率由事件波形的开关分数与期望的相位关系的比率确定。本发明特别适用于在高速成帧摄像机在其加速期间的快门的打开周期期间以及其基本恒定速度的周期期间提供触发或同步脉冲。

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