1756-L72+-+1756-L72
1756-L72+-+1756-L72用軟件數(shù)字濾波的方法提高輸入信號(hào)的信噪比。為了提高輸入信號(hào)的信噪比,常采用軟件數(shù)字濾波來提高有用信號(hào)真實(shí)性。對(duì)于有大幅度隨機(jī)干擾的系統(tǒng),采用程序限幅法,即連續(xù)采樣五次,若某一次采樣值遠(yuǎn)遠(yuǎn)大于其它幾次采樣的幅值,那么就舍去之。對(duì)于流量、壓力、液面、位移等參數(shù),往往會(huì)在一定范圍內(nèi)頻繁波動(dòng),則采用算術(shù)平均法。即用n次采樣的平均值來代替當(dāng)前值。一般認(rèn)為:流量n= 12,壓力n=4最合適。對(duì)于緩慢變化信號(hào)如溫度參數(shù),可連續(xù)三次采樣,選取居中的采樣值作為有效信號(hào)。對(duì)于具有積分器A/D轉(zhuǎn)換來說,采樣時(shí)間應(yīng)取工頻周期(20ms)的整數(shù)倍。實(shí)踐證明其抑制工頻干擾能力超過單純積分器的效果。~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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