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process for the stabilization of periodic impulses in the time of analysis and equipment for execution of the process.
process for the stabilization of periodic impulses in the time of analysis and equipment for execution of the process.
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机译:用于稳定分析过程中的周期性脉冲的过程以及用于执行该过程的设备。
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摘要
A method and a circuit arrangement for time stabilization of scanning pulses for the stroboscopic sampling of periodically recurring signals. Stroboscopic sampling is performed by means of scanning pulses having a repetition period slightly different from the period of the recurring signals to be scanned. The signals to be scanned are transmitted over a transmission line in which a measuring section of known length is defined by the distance between two tapping points to each of which a sampling circuit is connected. The signals transmitted over the transmission line are sampled stroboscopically by means of the scanning pulses whereby time-transformed signals are obtained. These time-transformed signals are separated by a time interval corresponding to the transit time of the signals in the measuring section multiplied by the time-transformation factor. The number of scans occurring in this time-interval is counted and compared with a given desired number; if there is a difference between the two compared numbers, the scanning pulse period is changed so as to eliminate this difference. In an alternative embodiment, the measuring section is defined by a transmission line section of different characteristic impedance, and the recurrent signals are sampled at a single tapping point ahead of this transmission line section; in this case the time-interval corresponding to the transit time is determined by means of the reflexions occurring at the impedance breaks.
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