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Dołączył: 29 Paź 2010
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 Wysłany: Nie 9:05, 28 Lis 2010 Temat postu: ugg botas An anti-software-frequency interference |
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An anti-frequency interference filter software
, The children also completed a sampling program (see Figure 4PIO port interrupt service routine block diagram). Obviously, these two sampling intervals of 7 - / 2, which is half the frequency of these two sampling cycle is completed, get their arithmetic mean and then PIOEI interrupt status is set to OFF, then, even if the zero pulse will not reach the PIO port interrupt request until the next CTC-up time, CTC interrupt service routine only then set into the open mouth PIO interrupt status, the zero pulse and the PIO port interrupt request to repeat this process, again and again. As mentioned above, CTC timer computer time is equal to real time control system of the sampling period Ts, and Ts the sampling period within the two consecutive sampling time interval 7 / Z, so the system must sample period 7s too in the work frequency signal cycle 71. Should be noted that the software filter should not be used in isolation, but should be with the usual digital filter used in combination, it will not only filter out power line interference, but also filter out the non-frequency interference, for example, the above methods and up and use the median method Jie He, Zhu systems in the computer real rs each sampling period, the continuous Jinxing (≥ 3.290 ・ ELECTRICAL ENGINEERING ioo1 briefly on the main program block diagram of Figure 3 the 奇数) round of sampling, each round sampling interval equal to the frequency cycle of 7 ',[link widoczny dla zalogowanych], each one sampled twice within a time interval equal to Q V / 2,[link widoczny dla zalogowanych], therefore, the need to implement computer control system sampling period-frequency cycle of 7's is much larger than 7'. Figure 4PIO box port interrupt service routine within the loop to the first round of the arithmetic mean of two consecutive samples as the first round of samples, and similarly, the second round of the average of the two samples as the second round sample value, and so on. And then that m-value for comparison whichever value for l 5 (35) An anti-frequency interference filter 291 * the software for the Qian-sample of the input value, electricity is the computation of the samples. The block diagram shown in Figure 3 and Figure 4,[link widoczny dla zalogowanych], the storm CTC interrupt service routine is very simple diagram, it is omitted. By the way,[link widoczny dla zalogowanych], the process control system of the sampling period of a 'generally are second-class, and the maximum time a channel CTC time is about 33ms, can not meet the requirements, we combine the CTC channel 0-2 as a timer, and its combinations shown in Figure 2. As long as the appropriate choice of communication Bu 0 scaler coefficient and time constant of the three channels, you can meet the system requirements on the sampling period of the proposed method effectively filter cho belly frequency interference and AID conversion accuracy. For non-power frequency of sexual interference with other rhyme, the rhyme method can also be used. References 1 Zhou, Rong Dong ed.谩 computed real-time pull flI the interference. First Edition. Wood science and technology published by the North Hu Mu, 19B5 in February. 2 is the second increase, Gong Ruikun. Real-time pull-type machine emblem {lI system interference asked waist. Cut-off machines and should be thrown, 19B7 (5) t513 Hande Yuan. Machine control software plug emblem when thousands of anti-anti-Q outfitting. Computer learning. 1990 (4) I41AMethodforEliminatingIndustrialFrequencyInterferencebvuseofSoftwareFiltrationHanDeyuan. ZhaoYanan (ComputerApplication ・ Development & ResearchCenter., Hei? OngjiangProvince) ChenZhenghong (HeifongJiongUniuer3ity) Ab! TractThispaperdeseribesasoftwarefilteringmethodforeliminatingindustrialfrequencyinterferenceinordinaryindustrialprocesscontrolwiththeaid. fzerOcros8doteetioncircuits. Adetailedaccountofthefilteringtheoryanditsapp-lieationisalsogiven. Keywordsjcomputer,[link widoczny dla zalogowanych], control, interference, fifter, detection
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